Kurniawan Kurniawan Blogs

addEventListener vs attachEvent vs jquery bind

noreply@blogger.com (Kurniawan) — Mon, 10 Oct 2011 03:48:00 +0000

Unfortunately IE is not friendly to this idea (addEventListener) and decide to throw a javascript error.

After dig around, I found that we need to use AttachEvent insteead of AddEventListener to support IE.

Here are some of the reference
https://developer.mozilla.org/en/DOM/element.addEventListener
http://msdn.microsoft.com/en-us/library/ms536343(VS.85).aspx

as suggested solution, I did a fix in couple javascript code to fix this issue.

if (el.addEventListener){
el.addEventListener(‘click’, functionText, false);
} else if (el.attachEvent){
el.attachEvent(‘onclick’, functionText);
}

why not using Jquery Bind ?
and here is better solution if you use Event capture in addEventListener
Unfortunately, Event capturing is not supported by jQuery, as event capturing is not supported by IE, which jQuery supports.

if (el.addEventListener){
el.addEventListener(‘click’, functionText

TFS Unshelve to different branch

noreply@blogger.com (Kurniawan) — Fri, 05 Aug 2011 09:01:00 +0000

TFS Unshelve to different branch

For example (Trunk -> Branch)

Prerequisites :
Download and install the latest TFS Power toolshttp://visualstudiogallery.msdn.microsoft.com/c255a1e4-04ba-4f68-8f4e-cd473d6b971f

Steps :

1. Go to Console (cmd.exe)

2. Go to your target folder. otherwise you will get this error “unable to determine the workspace”

cd D:\Source\Branch1

3. execute tfpt.exe

tfpt unshelve ShelveName1 /migrate /source:$/Project/Trunk /target:$/Project/Branches/Branch1”

—

Here is the syntax : tfpt unshelve “MySampleShelveName” /migrate /source:”$/MyTeamProject/TheOrigionalBranch” /target:”TheDestinationBranch”

4. Confirm to unshelve

5. Merge

6. Check your pending changes (DONE)

——

Catches

If you get the error => “unable to determine the workspace”

NOTE: Take the latest from your source control and “cd” to a local path that is mapped to thetarget workspace. Also ensure that the current working directory is mapped, you can run “tf workspace” and see if the target folders are mapped.

implement ssl custom attribute in MVC

noreply@blogger.com (Kurniawan) — Mon, 25 Jul 2011 06:19:00 +0000

Example of how to implement your SSL Custom Attribute in MVC

· If it is login, then we must force it into secure otherwise we need to force to unsecure.

· Ideally in LoginController, we can use this attribute [CustomRequireHttps] which will force to use SSL

· For other controller, we can use this attribute [CustomRequireHttps(false)] which will force not to use SSL

· For other controller which always not required SSL we can create other attribute to force not to use SSL [CustomNotRequireHttps]

///

Represents an attribute that forces an unsecured HTTP request to be re-sent over HTTPS.

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = false)]
public class CustomRequireHttpsAttribute : FilterAttribute, IAuthorizationFilter
{
private bool _ForceOnLoggedIn = false;

///

/// Constructor
///

///
public CustomRequireHttpsAttribute() : this(false);

///

/// Constructor
///

///
public CustomRequireHttpsAttribute(bool forceOnLoggedIn)
{
this._ForceOnLoggedIn = forceOnLoggedIn;
}

///

Handles unsecured HTTP requests that are sent to the action method.

/// An object that encapsulates information that is required in order to use the attribute.
/// The HTTP request contains an invalid transfer method override. All GET requests are considered invalid.
protected virtual void ForceSecure(AuthorizationContext filterContext)
{
if (!filterContext.HttpContext.Request.IsSecureConnection)
{
if (!string.Equals(filterContext.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
{
//throw error if the request is not get
throw new InvalidOperationException("SeekRequireHttpsAttribute_MustUseSsl");
}

string url = "https://" + filterContext.HttpContext.Request.Url.Host + filterContext.HttpContext.Request.RawUrl;
filterContext.Result = new RedirectResult(url);
}
}

///

Force unsecure page only deal with get method

/// An object that encapsulates information that is required in order to use the attribute.
/// The HTTP request contains an invalid transfer method override. All GET requests are considered invalid.
protected virtual void ForceUnsecure(AuthorizationContext filterContext)
{
if (filterContext.HttpContext.Request.IsSecureConnection)
{
//if it is secure page
if (string.Equals(filterContext.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
{
//only deal with get method
string url = "https://" + filterContext.HttpContext.Request.Url.Host + filterContext.HttpContext.Request.RawUrl;
filterContext.Result = new RedirectResult(url);
}
}
}

///

Determines whether a request is secured (HTTPS) and, if it is not, calls the method.

/// An object that encapsulates information that is required in order to use the attribute.
/// The parameter is null.
public virtual void OnAuthorization(AuthorizationContext filterContext)
{
if (filterContext == null)
{
throw new ArgumentNullException("filterContext");
}

if (_ForceOnLoggedIn == false)
{
this.ForceSecure(filterContext);
}
else
{
//check if Login
if (filterContext.RequestContext.HttpContext.User.Identity.IsAuthenticated)
{
//if login then need to force secure page
this.ForceSecure(filterContext);
}
else
{
//if not login then need to force to unsecure page
this.ForceUnsecure(filterContext);
}
}

}

anti frogery for mvc and ajax

noreply@blogger.com (Kurniawan) — Thu, 21 Jul 2011 08:43:00 +0000

I just found very good solution to protect our sites from Anti Frogery for ASP.NET MVC and AJAX.

This solution can be easily applied to class controller and ajax.

Here is the article.

http://weblogs.asp.net/dixin/archive/2010/05/22/anti-forgery-request-recipes-for-asp-net-mvc-and-ajax.aspx

--

Javascript XSS Attack

noreply@blogger.com (Kurniawan) — Wed, 20 Jul 2011 08:17:00 +0000

Reminder for javascript XSS Attack

For example

var name = "<%= UserInput %>";

If there is a post which submit the username with
" ;alert(document.cookie);//

then this will trigger XSS Attack.

There is simple fix which I have added inside String Extension (available for Support R5)
var currentUsername = "<%= Encoder.JavascriptEncode(UserInput) %>";

Hopefully this post can be a reminder for all of us to protect our site.

Client validation in FF

noreply@blogger.com (Kurniawan) — Mon, 11 Jul 2011 05:45:00 +0000

Recently, I have to fix a bug where client validation doesn’t work in FF.

Finally, i notice that the problem exist in web.config which tells to force xhtmlConformance mode=”legacy”

1:
This will render the validation attribute

1:
2: 3: controltovalidate="text1"
4: id="required1"
5: evaluationfunction="RequiredFieldValidatorEvaluateIsValid"
6: validationgroup="grp1"
7: initialvalue=""
8: style="color:Red;visibility:hidden;">required
Instead of this

1: 2: yle="color:Red;visibility:hidden;">required
3:
4:
The reason why it doesn’t work is EXPANDO.

When tracing in the debugger, you can see that the expando properties are
not recognized, though they do exist in the "attributes" collection.
Expando attributes are fine in Firefox, but cannot be accessed as if they
are a part of the DOM as IE allows. Any attribute that is not part of the
DOM is only accessible via obj.getAttribute('x') or obj.attributes['x'].value.

The ASP.NET 2.0 client script library needs to be updated to avoid the
DOM-like property access to expando attributes. Instead, use getAttribute().
Some links re expandos:
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/referen
ce/properties/expando.asp
http://www.xulplanet.com/ndeakin/archive/2004/9/12/
http://www.howtocreate.co.uk/tutorials/javascript/dombasics
Also, all HTML attributes are supposed to be caseless, so
and are identical. However IE 6 treats them as two
different attributes, so be sure that all references are in lowercase!

EJB 3.1 Cookbook

noreply@blogger.com (Kurniawan) — Wed, 22 Jun 2011 10:16:00 +0000

Recently I read new release book titled “EJB 3.1 Cookbook” by Richard M.Reese. http://www.packtpub.com/ejb-3-1-cookbook/book

If you wonder why I read this book instead of .NET book, Please find it on this post. =D

This book talks about building real world EJB solutions with a collection of simple but incredibly effective recipes and here a list of the overview of this book.

Build real world solutions and address many common tasks found in the development of EJB applications
Manage transactions and secure your EJB applications
Master EJB Web Services
Part of Packt's Cookbook series: Comprehensive step-by-step recipes illustrate the use of Java to incorporate EJB 3.1 technologies

Enterprise Java Beans enable rapid and simplified development of secure and portable applications based on Java technology.Creating and using EJBs can be challenging and rewarding. Among the challenges are learning the EJB technology itself, learning how to use the development environment you have chosen for EJB development, and the testing of the EJBs.

This EJB 3.1 Cookbook addresses all these challenges and covers new 3.1 features, along with explanations of useful retained features from earlier versions. It brings the reader quickly up to speed on how to use EJB 3.1 techniques through the use of step-by-step examples without the need to use multiple incompatible resources. The coverage is concise and to the point, and is organized to allow you to quickly find and learn those features of interest to you.

The book starts with coverage of EJB clients. The reader can choose the chapters and recipes which best address his or her specific needs. The newer EJB technologies presented include singleton beans which support application wide needs and interceptors to permit processing before and after a target method is invoked. Asynchronous invocation of methods and enhancements to the timer service are also covered.

The EJB 3.1 CookBook is a very straightforward and rewarding source of techniques supporting Java EE applications.

What you will learn from this book :

Create and use the different types of EJBs along with the use of the optional session bean business interface
Create a singleton session bean for application-wide use
Use declarative and programmatic techniques for security, timer services, and transaction processing
Use asynchronous session beans to complement message driven beans
Support aspect oriented features such as logging and data validation using interceptors
Use EJBs in support of message based applications
Master the use of deployment descriptors and improved packaging options
Use EJBs outside of the Java EE environment using the embeddable container

Approach

Each recipe comprises step-by-step instructions followed by an analysis of what was done in each task and other useful information. The book is designed so that you can read it chapter by chapter, or look at the list of recipes and refer to them in no particular order. It is packed with useful screenshots to make your learning even easier.

Who this book is written for

The book is aimed at Java EE and EJB developers and programmers. Readers should be familiar with the use of servlets in the construction of a web application. A working knowledge of XML is also desirable.

After I read this book I am really grateful to take .NET as my favourite framework. Because since in I was uni when I was first learned EJB, The version was not different. There is slightly changes and less improvement. However overall this book is really great. Easy to read and great coverage of knowledge.

Html5 histoty API and CSS3 transitions

noreply@blogger.com (Kurniawan) — Thu, 09 Jun 2011 01:58:00 +0000

Check out new HTML5 History API allows us to manage the URL changes while CSS3 transitions handle the sliding. Permalinks are always maintained, your back button works as expected, and it's much faster than waiting for a full page load.

Basically we intercept your click, call pushState() to change the browser's URL, load in data with Ajax, then slide over to it.

$('#slider a').click(function() {
history.pushState({ path: this.path }, '', this.href)
$.get(this.href, function(data) {
$('#slider').slideTo(data)
})
return false
})
view rawslide.jsThis Gist brought to you by GitHub.
When you hit the back button, an onpopstate handler is fired after the URL changes, making it easy to send you "back".

$(window).bind('popstate', function() {
$('#slider').slideTo(location.pathname)
})
view rawunslide.jsThis Gist brought to you by GitHub.

TDD Practices

noreply@blogger.com (Kurniawan) — Wed, 08 Jun 2011 06:10:00 +0000

Just read couple good article which I think required for anyone who writing unit testing.

Here couple of screen shot from those article

Concept

Finding bugs (things that don’t work as you want them to)
=> Manual testing (sometimes also automated integration tests)

Detecting regressions (things that used to work but have unexpectedly stopped working)
=> Automated integration tests (sometimes also manual testing, though time-consuming)

Designing software components robustly
=>Unit testing (within the TDD process)

Good unit tests vs bad ones

TDD helps you to deliver software components that individually behave according to your design. A suite of good unit tests is immensely valuable: it documents your design, and makes it easier to refactor and expand your code while retaining a clear overview of each component’s behaviour. However, a suite of bad unit tests is immensely painful: it doesn’t prove anything clearly, and can severely inhibit your ability to refactor or alter your code in any way.

Where do your tests sit on the following scale?

Unit tests created through the TDD process naturally sit at the extreme left of this scale. They contain a lot of knowledge about the behaviour of a single unit of code. If that unit’s behaviour changes, so must its unit tests, and vice-versa. But they don’t contain any knowledge or assumptions about other parts of your codebase, so changes to other parts of your codebase don’t make them start failing (and if yours do, that shows they aren’t true unit tests). Therefore they’re cheap to maintain, and as a development technique, TDD scales up to any size of project.

At the other end of the scale, integration tests contain no knowledge about how your codebase is broken down into units, but instead make statements about how the whole system behaves towards an external user. They’re reasonably cheap to maintain (because no matter how you restructure the internal workings of your system, it needn’t affect an external observer) and they prove a great deal about what features are actually working today.

Anywhere in between, it’s unclear what assumptions you’re making and what you’re trying to prove. Refactoring might break these tests, or it might not, regardless of whether the end-user experience still works. Changing the external services you use (such as upgrading your database) might break these tests, or it might not, regardless of whether the end-user experience still works. Any small change to the internal workings of a single unit might force you to fix hundreds of seemingly unrelated hybrid tests, so they tend to consume a huge amount of maintenance time – sometimes in the region of 10 times longer than you spend maintaining the actual application code. And it’s frustrating because you know that adding more preconditions to make these hybrid tests go green doesn’t truly prove anything.

Tips for writing great unit tests

Enough vague discussion – time for some practical advice. Here’s some guidance for writing unit tests that sit snugly at Sweet Spot A on the preceding scale, and are virtuous in other ways too.

Make each test orthogonal (i.e., independent) to all the others
Any given behaviour should be specified in one and only one test. Otherwise if you later change that behaviour, you’ll have to change multiple tests. The corollaries of this rule include:
- Don’t make unnecessary assertions
  Which specific behaviour are you testing? It’s counterproductive to Assert() anything that’s also asserted by another test: it just increases the frequency of pointless failures without improving unit test coverage one bit. This also applies to unnecessary Verify() calls – if it isn’t the core behaviour under test, then stop making observations about it! Sometimes, TDD folks express this by saying “have only one logical assertion per test”.
  Remember, unit tests are a design specification of how a certain behaviour should work, not a list of observations of everything the code happens to do.
- Test only one code unit at a time
  Your architecture must support testing units (i.e., classes or very small groups of classes) independently, not all chained together. Otherwise, you have lots of overlap between tests, so changes to one unit can cascade outwards and cause failures everywhere.
  If you can’t do this, then your architecture is limiting your work’s quality – consider using Inversion of Control.
- Mock out all external services and state
  Otherwise, behaviour in those external services overlaps multiple tests, and state data means that different unit tests can influence each other’s outcome.
  You’ve definitely taken a wrong turn if you have to run your tests in a specific order, or if they only work when your database or network connection is active.
  (By the way, sometimes your architecture might mean your code touches static variables during unit tests. Avoid this if you can, but if you can’t, at least make sure each test resets the relevant statics to a known state before it runs.)
- Avoid unnecessary preconditions
  Avoid having common setup code that runs at the beginning of lots of unrelated tests. Otherwise, it’s unclear what assumptions each test relies on, and indicates that you’re not testing just a single unit.
  An exception: Sometimes I find it useful to have a common setup method shared by a very small number of unit tests (a handful at the most) but only if all those tests require all of those preconditions. This is related to the context-specification unit testing pattern, but still risks getting unmaintainable if you try to reuse the same setup code for a wide range of tests.
(By the way, I wouldn’t count pushing multiple data points through the same test (e.g., using NUnit’s [TestCase] API) as violating this orthogonality rule. The test runner may display multiple failures if something changes, but it’s still only one test method to maintain, so that’s fine.)
Don’t unit-test configuration settings
By definition, your configuration settings aren’t part of any unit of code (that’s why you extracted the setting out of your unit’s code). Even if you could write a unit test that inspects your configuration, it merely forces you to specify the same configuration in an additional redundant location. Congratulations: it proves that you can copy and paste!
Personally I regard the use of things like filters in ASP.NET MVC as being configuration. Filters like [Authorize] or [RequiresSsl] are configuration options baked into the code. By all means write an integration test for the externally-observable behaviour, but it’s meaningless to try unit testing for the filter attribute’s presence in your source code – it just proves that you can copy and paste again. That doesn’t help you to design anything, and it won’t ever detect any defects.
Name your unit tests clearly and consistently
If you’re testing how ProductController’s Purchase action behaves when stock is zero, then maybe have a test fixture class called PurchasingTests with a unit test called ProductPurchaseAction_IfStockIsZero_RendersOutOfStockView(). This name describes the subject (ProductController’s Purchase action), the scenario (stock is zero), and the result (renders “out of stock” view). I don’t know whether there’s an existing name for this naming pattern, though I know others follow it. How about S/S/R?
Avoid non-descriptive unit tests names such as Purchase() or OutOfStock(). Maintenance is hard if you don’t know what you’re trying to maintain.

IE9 [Tidy Error] in Umbraco

noreply@blogger.com (Kurniawan) — Tue, 24 May 2011 23:25:00 +0000

In the mean time to solve this problem is to force the compatibility mode in IE9 inside the umbraco folder

This how you can do this

Header name : X-UA-Compatible
Value : IE=8

Google Chrome Autofill for password

noreply@blogger.com (Kurniawan) — Tue, 24 May 2011 05:43:00 +0000

Recently I found an error in my web apps when I ran it to Google Chrome.

After debugging , It seems Google Chrome do prefill after the page load and trigger the javascript.

So be careful to have this javascript which purposely trigger login button on change on password text box.


    var setupTriggerButton = function ()
    {
        //for login trigger       
        //DON'T DO ONCHANGE - only use keypress, because browser (Chrome) can automatically fill and cause postback
        /*
        $(".txtTriggerButton").live("change", function (e)
        {
            var rel = $(this).attr("rel");
            if (rel && rel != "")
            {
                $(rel).click();
            }
        });
        */
        //trigger login
        $(".txtTriggerButton").live("keypress", function (e)
        {
            var rel = $(this).attr("rel");
            if (rel && rel != "")
            {
                //$.log('run from DISABLE DEFAULT BUtton');
                return runFunctionOnEnter(e,
                    function ()
                    {
                        $(rel).click();
                    }
                );
            }
        });
    }

ClientIDMode = “Predictable” broke my dropdown list auto partial postback

noreply@blogger.com (Kurniawan) — Tue, 19 Apr 2011 06:48:00 +0000

In my previous post, I try to upgrade my recent .NET web apps to use recent .NET for capabilities by doing this

<pages controlRenderingCompatibilityVersion="4.0">

But unfortunately, I find couple of my control inside UPDATE PANEL – does not do Partial Postback anymore. (It is doing FULL postback now)

This only happen to a control outside button which I have set as autoPostback = true.

After looking around and test which part that I need to put it back, I found clientIDMode.

I need to set clientIDMode=“AutoID” because the default value is “Predictable”.

<pages controlRenderingCompatibilityVersion="4.0" clientIDMode="Predictable">

The weird things is I try to compare the id and html which generated by both “predictable and “AutoID”. And the result is the SAME but the different is one of them can do partial postback and one of them not.

<!-- Generated when I set "clientIDMode='Predictable'" -->
<select class="ddlPostback" id="ContentPlaceHolderDefault_MainContainerPlaceHolder_ucProductDetail_rptVariationChoiceGroup_ddlChoiceGroup_0" onchange="javascript:setTimeout('__doPostBack(\'ctl00$ctl00$ctl00$ContentPlaceHolderDefault$MainContainerPlaceHolder$ucProductDetail$rptVariationChoiceGroup$ctl00$ddlChoiceGroup\',\'\')', 0)" name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$MainContainerPlaceHolder$ucProductDetail$rptVariationChoiceGroup$ctl00$ddlChoiceGroup">
        <option value="">Please select</option>
        <option value="2" selected="selected">Green</option>
        <option value="3">Yellow</option>
        <option value="4">Blue</option>
        <option value="5">Brown</option>
</select>
    
    
<!-- Generated when I set "clientIDMode='AutoID'" -->    
<select class="ddlPostback" id="ContentPlaceHolderDefault_MainContainerPlaceHolder_ucProductDetail_rptVariationChoiceGroup_ddlChoiceGroup_0" onchange="javascript:setTimeout('__doPostBack(\'ctl00$ctl00$ctl00$ContentPlaceHolderDefault$MainContainerPlaceHolder$ucProductDetail$rptVariationChoiceGroup$ctl00$ddlChoiceGroup\',\'\')', 0)" name="ctl00$ctl00$ctl00$ContentPlaceHolderDefault$MainContainerPlaceHolder$ucProductDetail$rptVariationChoiceGroup$ctl00$ddlChoiceGroup">
        <option value="">Please select</option>
        <option value="2" selected="selected">Green</option>
        <option value="3">Yellow</option>
        <option value="4">Blue</option>
        <option value="5">Brown</option>
</select>

Grab asp.net 4.0 benefits

noreply@blogger.com (Kurniawan) — Fri, 15 Apr 2011 06:49:00 +0000

When you upgrade asp.net 2.0/3.5 project using Visual studio.
VS will automatically add a configuration which prevent you from breaking the results of the projects.

Here is couple example of the configuration which preserve the behaviour of .net 2.0/3.5

<pages controlRenderingCompatibilityVersion="3.5" enableEventValidation="false" clientIDMode="AutoID">

ControlRenderingCompatibilityVersion Setting in the Web.config File

ASP.NET controls have been modified in the .NET Framework version 4 in order to let you specify more precisely how they render markup. In previous versions of the .NET Framework, some controls emitted markup that you had no way to disable. By default, ASP.NET 4 this type of markup is no longer generated.

If you use Visual Studio 2010 to upgrade your application from ASP.NET 2.0 or ASP.NET 3.5, the tool automatically adds a setting to the Web.config file that preserves legacy rendering. However, if you upgrade an application by changing the application pool in IIS to target the .NET Framework 4, ASP.NET uses the new rendering mode by default.

ClientIDMode Changes

The ClientIDMode setting in ASP.NET 4 lets you specify how ASP.NET generates the id attribute for HTML elements. In previous versions of ASP.NET, the default behavior was equivalent to the AutoID setting of ClientIDMode. However, the default setting is now Predictable.

If you use Visual Studio 2010 to upgrade your application from ASP.NET 2.0 or ASP.NET 3.5, the tool automatically adds a setting to the Web.config file that preserves the behavior of earlier versions of the .NET Framework. However, if you upgrade an application by changing the application pool in IIS to target the .NET Framework 4, ASP.NET uses the new mode by default.

<httpRuntime requestValidationMode="2.0"/>

ASP.NET Request Validation

The request validation feature in ASP.NET provides a certain level of default protection against cross-site scripting (XSS) attacks. In previous versions of ASP.NET, request validation was enabled by default. However, it applied only to ASP.NET pages (.aspx files and their class files) and only when those pages were executing.

In ASP.NET 4, by default, request validation is enabled for all requests, because it is enabled before the BeginRequest phase of an HTTP request. As a result, request validation applies to requests for all ASP.NET resources, not just .aspx page requests. This includes requests such as Web service calls and custom HTTP handlers. Request validation is also active when custom HTTP modules are reading the contents of an HTTP request.

As a result, request validation errors might now occur for requests that previously did not trigger errors.

==================================

To get asp.net 4.0 benefits including smaller viewstate, you need to clean that configuration or change that into this.

<pages controlRenderingCompatibilityVersion="4.0">

Reference By Value for integer doesn’t work in entity framework / LINQ query

noreply@blogger.com (Kurniawan) — Tue, 12 Apr 2011 07:36:00 +0000

Just find an interesting bugs, where I thought reference by value (int) can be used in entity framework or linq query.

Here is the code



lst = new List<IQueryable<tblProduct>>();
 int choiceID = 30;
 lst.Add(from t in originalQuery
         where t.tblProductChoiceTag.Any(c => c.ChoiceID == choiceID)
         select t);
 choiceID = 31;
 lst.Add(from t in originalQuery
         where t.tblProductChoiceTag.Any(c => c.ChoiceID == choiceID)
         select t);
       

            IQueryable<tblProduct> q = null;

            bool first = true;
            foreach (var tquery in lst)
            {
                if (first)
                {
                    q = tquery;
                    first = false;
                }
                else
                {   //the next one combine it
                    q = q.Union(tquery);
                }

            }

When it executed, linq query will use the last choiceID (31) and override (30).

This really weird, because I thought It is saved to use the same (int) variable because it will pass by value.

Here is another example

var q = (from t in DBHelper.Instance.tblProductVariation
                    where t.ProductID == pid
                    && t.tblChoice.Count == choices.Count
                    select t);

            foreach (var c in choices)
            {
                q = (from t in q
                     where t.tblChoice.Any(ch=>ch.ChoiceID == c.ChoiceID)
                     select t);
            }
              a
            return q.FirstOrDefault();

See on this query which the value will be iterating from the choice object

q = (from t in q
where t.tblChoice.Any(ch=>ch.ChoiceID == c.ChoiceID)
select t);
this code will pass the same value of choiceID.

To fix this you need to change it into local variable.
var cid = c.ChoiceID;

q = (from t in q
where t.tblChoice.Any(ch=>ch.ChoiceID == cid)
select t);

Anyone can explain this ?

Firefox Update panel after 2 mins idle time

noreply@blogger.com (Kurniawan) — Fri, 08 Apr 2011 00:45:00 +0000

Recently, I fight with firefox bug which aborting my partial postback from update panel after 2 mins idle time.

Here was my step to investigate this problem

check other browsers (IE, IE6, Chrome) – and the result, only firefox does this weird behaviour
create simple update panel and tested on FF. – unfortunately this work perfectly
and then I wonder why my actual code does not work.
Apply more content on Update Panel – It is not work again (oh my be it’s I need to make my content on update panel smaller)
After trying to make my update panel content smaller, it still not work.
Then I use my previous simple update panel to test if it is content outside update panel is matter. – (Yes, it is the content outside update panel is matter)
Confuse how I solve this, we still need to use update panel for particular reason because of the due date, etc. so we can’t change anything (we have to keep the update panel but has to work in FF)

After looking around the solutions, luckily I found on the other section of my project work perfectly after 2 mins idle in FF.

I try to investigate why that section work but not this. Finally I figure out that the different is that part is calling ajax call on other page before call partial postback.

Then here is my simple solutions to fix this.

check the browser if it is mozilla and the time difference is 2 mins then request to other server page (ASPX page) first synchonously before continue the process.

Here is the code, hopefully it will help your problem as well.

//check availability for partial postback for FF fixed. FF will abort the partial postback call after 2 mins unless it call ajax to other page first
 var checkConnectionForPartialPostback = function ()
 {
     $.ajax({
         url: "/usercontrols/testconnection.aspx",
         async: false
     });
 };

 //check availability for partial postback for FF fixed. FF will abort the partial postback call after 2 mins unless it call ajax to other page first
 var checkAvailabilityForPartialPostback = function ()
 {
     //firefox fix for time diff        
     if ($.browser.mozilla && GetTimeDiff(new Date(), lastLoadTime).getMinutes() >= 2)
     {
         //refresh this page            
         checkConnectionForPartialPostback();
     }
     else
     {
         lastLoadTime = new Date();
     }
 };

IE9–Fastest Browser ?

noreply@blogger.com (Kurniawan) — Wed, 06 Apr 2011 08:45:00 +0000

Some people said that IE9 aim to be the fastest browser in the world.

Is that true ? Check this out and compare it with other browser

http://ie.microsoft.com/testdrive/Performance/KungFu/Default.html

Basic Geolocation example

noreply@blogger.com (Kurniawan) — Wed, 06 Apr 2011 08:40:00 +0000

Here is some basic geolocation example and display it to google maps.

<!DOCTYPE html>
<html>

  <head>
  <script src="js/jquery-1.4.2.min.js"></script>
  <script src="js/yqlgeo.js"></script>
  <script>
    jQuery(window).ready(function(){
        jQuery("#btnInit").click(initiate_geolocation);
    })

    function initiate_geolocation() {
        if (navigator.geolocation)
        {
            navigator.geolocation.getCurrentPosition(handle_geolocation_query, handle_errors);
        }
        else
        {
            yqlgeo.get('visitor', normalize_yql_response);
        }
    }

    function handle_errors(error)
    {
        switch(error.code)
        {
            case error.PERMISSION_DENIED: alert("user did not share geolocation data");
            break;

            case error.POSITION_UNAVAILABLE: alert("could not detect current position");
            break;

            case error.TIMEOUT: alert("retrieving position timedout");
            break;

            default: alert("unknown error");
            break;
        }
    }

    function normalize_yql_response(response)
    {
        if (response.error)
        {
            var error = { code : 0 };
            handle_error(error);
            return;
        }

        var position = {
            coords :
            {
                latitude: response.place.centroid.latitude,
                longitude: response.place.centroid.longitude
            },
            address :
            {
                city: response.place.locality2.content,
                region: response.place.admin1.content,
                country: response.place.country.content
            }
        };

        handle_geolocation_query(position);
    }

    function handle_geolocation_query(position){
        alert('Lat: ' + position.coords.latitude + ' ' +
              'Lon: ' + position.coords.latitude);
        }
    </script>

  </head>
  <body>
    <div>
      <button id="btnInit" >Find my location</button>
    </div>

  </body>
</html>function handle_geolocation_query(position)
{
    var image_url = "http://maps.google.com/maps/api/staticmap?sensor=false&center=" + position.coords.latitude + "," +
                    position.coords.longitude + "&zoom=14&size=300x400&markers=color:blue|label:S|" +
                    position.coords.latitude + ',' + position.coords.longitude;

    jQuery("#map").remove();
    jQuery(document.body).append(
        jQuery(document.createElement("img")).attr("src", image_url).attr('id','map')
    );
}

JQuery Intellisense in VS 2010

noreply@blogger.com (Kurniawan) — Wed, 06 Apr 2011 07:06:00 +0000

If you want jquery intellisense in your visual studio like this the you can get the vsdoc file generator which hosted by damo

http://damianedwards.com/vsdoc/

Refresh Javascript

noreply@blogger.com (Kurniawan) — Tue, 29 Mar 2011 00:53:00 +0000

Here are my favourite links to refresh or introduce Javascript to new comers.

http://www.jslint.com/lint.html

http://vimeo.com/18511621

http://developer.yahoo.com/yui/theater/ by Douglas Crockford

Javascript is a wild language which need to be tamed.
Here are some js pattern which I think best pattern to tackle down the scoping and closure issue which called (Module Pattern)

http://stackoverflow.com/questions/3722820/examples-of-practical-javascript-object-oriented-design-patterns

Recently I build a framework called SiteUI which follows this pattern and give you protection and flexibility.

SiteUI.BaseUI = function (options)
{
    //default options
    var defaultsOpt = {
        //set it to false otherwise, when you disable from the ajax, it when postback it will enable all your control
        //but if you have other reason you can do so.
        disableAllButtonOnSubmit: false,
        ajaxProcessMessage: "Processing..."
    };

    var options = $.extend(defaultsOpt, options);


    //optional value - to disable all button on submit or not
    var disableAllButtonOnSubmit = options.disableAllButtonOnSubmit;
    var setDisableAllButtonOnSubmit = function (value)
    {
        disableAllButtonOnSubmit = value;
    }

    var ajaxProcessMessage = options.ajaxProcessMessage;
    var setAjaxProcessMessage = function (value)
    {
        ajaxProcessMessage = value;
    }

    //Shopping Cart Control
    var shoppingCartControl = null;

    var ddlPostbackSelector = '.ddlPostback';
    var txtPostbackSelector = '.txtPostback';
    var btnPostbackSelector = '.btnPostback';
    var chkPostbackSelector = '.chkPostback';

    var loadingSelector = '.postbackLoading';
    var loaderHtml = "<img src='/images/ajax-loader.gif' class='postbackLoading' style='width:15px;height:15px;position:absolute; z-index:9999;' />";



    var isHideLoadingBeforePostbackTemporary = false;
    //this to indication a form validator after call back - (CommonFormValidator.js option)        
    var formValidator_CallBack = function (source, isValid)
    {
        //alert('formValidator_CallBack : ' + isValid);
        if (!isValid)
        {
            //not valid - hide loading temporary - because this will be called first before click happen                
            isHideLoadingBeforePostbackTemporary = true;
        }
    };

    //Show loading
    var showLoadingBeforePostback = function (source, addLoadingToParent)
    {
        //alert('showLoadingBeforePostback isHideLoadingBeforePostbackTemporary: ' + isHideLoadingBeforePostbackTemporary);
        if (!isHideLoadingBeforePostbackTemporary)
        {
            //add loader html after
            if (addLoadingToParent)
            {
                $(source).parent().after(loaderHtml);
                showPageLoader(); //show page loader
            }
            else
            {
                $(source).after(loaderHtml);
                showPageLoader(); //show page loader
            }
        }
        else
        {
            //set it to false again
            isHideLoadingBeforePostbackTemporary = false;
        }
    };

    //Clear Loading Function
    var clearLoading = function ()
    {
        $(loadingSelector).remove();
        hidePageLoader();
    };

    //show Page loader - this using jquery.loader this will disable all the button automatically
    var showPageLoader = function ()
    {
        $.loader({
            className: "loaderBox",
            content: ''
        });

    };

    //hide page loader
    var hidePageLoader = function ()
    {
        $.loader('close');
    };

    //Show Hide Loading On Content
    var showHideLoadingOnContent = function (contentSelector, isShow)
    {
        if (isShow)
        {
            $(contentSelector).before(loaderHtml); //add loader after it fades                    

            //show loading        
            showPageLoader(); //show page loader to hide
            $(contentSelector).animate({ opacity: 0 }, 150);
            //$(contentSelector).effect('fade',null,500);

        }
        else
        {
            //hide loading - remove all loading selector
            $(loadingSelector).remove(); //remove loader first
            hidePageLoader(); // hide page loader
            //just in case if in the beginning it hides this
            $(contentSelector).animate({ opacity: 1 }, 150);
            //$(contentSelector).effect('fade',null,500);
        }
    };

    //redirect content
    var redirectContent = function (url, contentSelector)
    {
        if (contentSelector)
        {  //only if they pass content selector we can redirect with show and hide loading
            showHideLoadingOnContent(contentSelector, true);
        }

        window.location = url;
    };

    //update content
    var updateContent = function (responseText, contentSelector, updateContent_Callback)
    {

        $(contentSelector).html(responseText);


        if (updateContent_Callback)
            updateContent_Callback(responseText);

        //hide loading on content
        showHideLoadingOnContent(contentSelector, false);
    };

    //Used to track last Request Ajax URL
    var lastRequestAjaxUrl = "";
    //load content
    var loadContent = function (ajaxUrl, relatedData, contentSelector, updateContent_Callback)
    {
        showHideLoadingOnContent(contentSelector, true);

        lastRequestAjaxUrl = ajaxUrl;
        $.ajax({
            type: "POST",
            url: ajaxUrl,
            data: relatedData,
            complete: function (data, stat)
            {
                //only process last request ajax url
                if (this.url == lastRequestAjaxUrl)
                {
                    //$.log("Update this " + this.url + " VS " + lastRequestAjaxUrl);
                    if (stat == "success")
                    {
                        var isError = true;
                        updateContent(data.responseText, contentSelector, updateContent_Callback);
                    }
                    else
                    {
                        updateContent("<p>Error Loading Data : " + stat + ' : ' + data.responseText + "</p>", contentSelector, updateContent_Callback);
                    }
                }
                else
                {
                    //$.log("Dispose this ajax " + this.url + " VS " + lastRequestAjaxUrl);
                }
            }
        });
    };


    // *************** MICROSOFT AJAX INIT - HANDLE ALL AJAX CALL*******************
    var initMicrosoftAjaxRequest = function ()
    {
        /// <reference name="MicrosoftAjax.js"/>
        if (typeof (Sys) != 'undefined' && typeof (Sys.WebForms) != 'undefined')
        {
            Sys.Application.add_init(microsoftAJAX_App_Init);
        }
    };

    var microsoftAJAX_App_Init = function ()
    {
        Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(microsoftAJAX_BeginRequest);
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(microsoftAJAX_EndRequest);
        Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(microsoftAJAX_pageLoaded);
    };

    var postbackTriggerElement;
    var microsoftAJAX_BeginRequest = function (sender, args)
    {
        if (disableAllButtonOnSubmit)
        {
            //disable all button
            disableAllSubmitButtons(true);
        }
        postbackTriggerElement = args.get_postBackElement()
        var ctrl = $(postbackTriggerElement);

        //remove all validation error
        removeAllValidationError();

        if (ctrl.is("input:checkbox") || ctrl.is("input:radio"))
        {
            ctrl.hide(); //hide this check box
            if (!ctrl.hasClass("noLoaderOnPostback"))
            {
                showLoadingBeforePostback(ctrl, true); //show loading on this control   
            }
        }
        else if (ctrl.is("input:submit"))
        {  //you can change it to other
            if (ctrl.hasClass("waitLabelOnPostback"))
            {
                if (ajaxProcessMessage != "")
                {
                    ctrl.val(ajaxProcessMessage);
                }
            }

            if (ctrl.hasClass("disableOnPostback"))
            {
                ctrl.attr('disabled', true); //disable but later on postback it will enable or disable based on the behaviour
            }


            if (!ctrl.hasClass("noLoaderOnPostback"))
            {
                showLoadingBeforePostback(ctrl);
            }
        }
        else
        {   //other items show loading
            //show loading on this control                
            if (!ctrl.hasClass("noLoaderOnPostback"))
            {
                showLoadingBeforePostback(ctrl);
            }
        }
    };

    var microsoftAJAX_pageLoaded = function (sender, args)
    {
        if (!postbackTriggerElement)
        {
            return;
        }

        //get updated panels and referesh
        var updatedPanels = args.get_panelsUpdated();
        for (i = 0; i < updatedPanels.length; i++)
        {
            //apply filter textbox
            setFilterTextbox(updatedPanels[i].id);
            //set rating 
            setRating(updatedPanels[i].id);
            //set date picker
            setDatePicker(updatedPanels[i].id);
            //set text area counter
            setTextAreaCounter(updatedPanels[i].id);

            //Call Microsoft AJAX_EndRequest_AdditionalFunciton() if available            
            if (typeof (microsoftAJAX_PageLoaded_AdditionalFunction) == 'function')
            {
                microsoftAJAX_PageLoaded_AdditionalFunction(updatedPanels[i].id);
            }
        }
    };


    //end request
    var microsoftAJAX_EndRequest = function (sender, args)
    {
        if (args.get_error() != undefined)
        {
            var errorMessage = args.get_error().message;
            args.set_errorHandled(true);
            alert("Error in ajax call : " + errorMessage);
            clearLoading(); //clear loading
            return;
        }


        if (disableAllButtonOnSubmit)
        {
            //enable all button
            disableAllSubmitButtons(false);
        }




        //Call Microsoft AJAX_EndRequest_AdditionalFunciton() if available            
        if (typeof (microsoftAJAX_EndRequest_AdditionalFunction) == 'function')
        {
            microsoftAJAX_EndRequest_AdditionalFunction();
        }


        //empty the postback element
        postbackTriggerElement = null;

        hidePageLoader(); //hide page loader
    };


    //this can be override by calling set ajax page loaded
    var microsoftAJAX_PageLoaded_AdditionalFunction = function (updatedPanelId)
    {
        //baseUI. microsoft AJAX Page Loaded Additional funxtion
        //you can write default function here
    };

    //this can be override by calling set ajax end request
    var microsoftAJAX_EndRequest_AdditionalFunction = function ()
    {
        //baseUI. microsoft AJAX End Request Additional funxtion
        //you can write default function here 
    };

    //override ajax end request
    var overrideMicrosoftAJAX_EndRequest_AdditionalFunction = function (func)
    {
        microsoftAJAX_EndRequest_AdditionalFunction = func;
    };

    //override ajax page loaded
    var overrideMicrosoftAJAX_PageLoaded_AdditionalFunction = function (func)
    {
        microsoftAJAX_PageLoaded_AdditionalFunction = func;
    };
    //-----------------------------------------------



    //use for postback
    var setupPostbackControlEvents = function ()
    {
        //show loading before postback
        $(ddlPostbackSelector).live("change", function (e)
        {
            //e.preventDefault();//cannot prevent default, it won't go to onclick
            showLoadingBeforePostback(this);
        });

        //filter search keyword
        $(txtPostbackSelector).live("change", function (e)
        {
            //e.preventDefault();//cannot prevent default, it won't go to onclick
            showLoadingBeforePostback(this);
        });

        $(btnPostbackSelector).live("click", function (e)
        {
            //e.preventDefault(); //cannot prevent default, it won't go to onclick
            showLoadingBeforePostback(this);

            if ($(this).hasClass("clearValidation"))
            {
                //check if it has class clear validation
                removeAllValidationError();
            }

        });


        $(chkPostbackSelector + " input").live("change", function (e)
        {
            //e.preventDefault(); //cannot prevent default, it won't go to onclick
            showLoadingBeforePostback(this, true);
            removeAllValidationError(); //it will clear validation - usually this will change the view
        });
    };


    //setup Dropdown Item
    var setupDropdownItem = function ()
    {

        //find drop down item trigger
        $('.dropdownItemTrigger').each(function ()
        {
            // Make the drop down cart appear/disappear.
            var boxSelector = $(this).attr('rel');

            // Set natural height and other properties of hidable object.
            $(boxSelector).data('naturalHeight', $(boxSelector).height());
            $(boxSelector).addClass('hidden');
            $(boxSelector).css(
            {
                display: 'none',
                bottom: 'auto'
            });

            // Create back reference.
            $(boxSelector).data('trigger', $(this));
        });

        $('.dropdownItemTrigger').live("click", function (e)
        {
            e.preventDefault();

            var $trigger = $(this);

            // Don't do anything if the drop down item is already animating.
            if ($trigger.hasClass('disabled')) return false;

            // Find direction.
            var direction = $trigger.hasClass('maximise') ? 1 : -1;

            // Find effect type.
            var classes = $trigger.attr('class'); //.match(/effect-/);
            var effect = $trigger.attr('class').match(/\beffect-[a-z]{1,}/);
            //alert(effect);

            // Make the drop down cart appear/disappear.
            var boxSelector = $trigger.attr('rel');



            if (boxSelector == shoppingCartControl.shoppingCartControlSelector)
            {
                shoppingCartControl.checkToReload();
            }

            $(boxSelector).trigger('dropdowntoggle', [direction, effect]);
        });

        $('.dropdownItem').live('dropdowntoggle', function (e, direction, fxtype)
        {
            var $dropdownItem = $(this);
            var $trigger = $dropdownItem.data('trigger');


            // Ensure direction.
            if (isNaN(direction)) direction = $dropdownItem.hasClass('shown') ? -1 : 1;

            // Disable trigger.
            $trigger.addClass('disabled');

            // Set states. / cursor            
            $trigger.toggleClass('maximise', direction == -1);
            $trigger.toggleClass('minimise', direction == 1);

            $dropdownItem.toggleClass('hidden', direction == -1);
            $dropdownItem.toggleClass('shown', direction == 1);

            // Effect 
            //var currPosition = $dropdownItem.css('top').replace(/([a-z]+)/, '') * 1
            var currPosition; // = direction == 1 ? $dropdownItem.height() * -1 : 0;
            var displacement; // = $dropdownItem.height(); //$dropdownItem.data('naturalHeight');
            var newPosition; // = currPosition + displacement * direction;

            //alert(fxtype);
            // Toggle drop down item + Effect
            if (fxtype == 'effect-slide')
            {
                // Calculate new values.
                currPosition = direction == 1 ? ($dropdownItem.height() * -1) : 0 - 50;
                displacement = $dropdownItem.height(); //$dropdownItem.data('naturalHeight');
                newPosition = currPosition + displacement * direction;

                // Execute
                $dropdownItem.css(
                        {
                            display: 'block',
                            top: currPosition
                        }).animate(
                        {
                            top: newPosition
                        }, 400, function ()
                        {
                            $trigger.toggleClass('active', direction == 1);

                            $trigger.removeClass('disabled');
                        });
            }
            else
            {
                // if (fxtype=='effect-fade') {
                // Calculate new values.
                var currOpacity = direction == 1 ? 0 : 1;
                var newOpacity = direction == 1 ? 1 : 0;


                //Execute
                $dropdownItem.css(
                        {
                            display: 'block',
                            top: 0,
                            opacity: currOpacity
                        }).animate(
                        {
                            opacity: newOpacity
                        }, 400, function ()
                        {
                            $trigger.toggleClass('active', direction == 1);
                            if (direction == -1)
                            {
                                //hide the display
                                $dropdownItem.css({display: 'none'});
                            }
                            $trigger.removeClass('disabled');
                        });
            }

        });
    };

    /*this doesn't work for shopping cart in IE 6*/
    var setupDropdownItemUsingJqueryUI = function ()
    {
        //Bind Drop down item - just require this button
        $('.dropdownItemTriggerBlind').live("click", function (e)
        {
            e.preventDefault();

            var $trigger = $(this);
            // Make the drop down cart appear/disappear.
            var boxSelector = $trigger.attr('rel');

            //check if it is shopping cart control
            if (boxSelector == shoppingCartControl.shoppingCartControlSelector)
            {
                shoppingCartControl.checkToReload();
            }


            //using jquery.ui toggle( effect, [options], [speed], [callback] )
            $(boxSelector).toggle('blind', null, 300);

        });

    }


    /*Setup Events - This will be call unsynchronously*/
    var setupEvents = function ()
    {   //setup postback control events
        setupPostbackControlEvents();
        //setup drop down
        setupDropdownItem();



        //for login trigger       
        $(".txtTriggerLogin").live("change", function (e)
        {
            $(".btnLogin").click();
        });

        $(".txtTriggerLogin").live("keypress", function (e)
        {
            //$.log('run from DISABLE DEFAULT BUtton');
            return runFunctionOnEnter(e,
                    function ()
                    {
                        $(".btnLogin").click();
                    }
                );
        });


        // Removes SEO text in navItems
        $(".clearText").html("");
        $(".clearText").removeClass("clearText");

        // Clears input fields on Focus
        // Title must match the value to clear.
        $(".clearField").live("blur", function ()
        {
            if ($(this).val() == "")
            {
                $(this).val($(this).attr("title"));
            };
        });

        $(".clearField").live("focus", function ()
        {

            if ($(this).val() == $(this).attr("title"))
            {
                $(this).val("");
            };
        });


        //bind shopping cart
        //cart = new SiteUI.ShoppingCart();
        //cart.updateCartHover();
    };

    /*Constructor*/
    var bindDefaultBehaviour = function ()
    {
        //init ajax request behaviour
        initMicrosoftAjaxRequest();
        //disable default button
        disableDefaultButton();

        //set droppy menu
        $('#dropdownNavigation').droppy();

        shoppingCartControl = new SiteUI.ShoppingCartControl();

        //run this async
        setTimeout(function ()
        {
            setupEvents();


            //apply filter textbox
            setFilterTextbox();

            setRating();
            setDatePicker();
            setTextAreaCounter();

        }, 0);
    };

    var init = function ()
    {

    }

    //return public method
    return {
        bindDefaultBehaviour: bindDefaultBehaviour,
        formValidator_CallBack: formValidator_CallBack,
        redirectContent: redirectContent,
        setupPostbackControlEvents: setupPostbackControlEvents,

        loadContent: loadContent,
        updateContent: updateContent,

        clearLoading: clearLoading,
        showLoadingBeforePostback: showLoadingBeforePostback,
        showHideLoadingOnContent: showHideLoadingOnContent,

        showPageLoader: showPageLoader,
        hidePageLoader: hidePageLoader,

        setAjaxProcessMessage: setAjaxProcessMessage,
        setDisableAllButtonOnSubmit: setDisableAllButtonOnSubmit,
        overrideMicrosoftAJAX_EndRequest_AdditionalFunction: overrideMicrosoftAJAX_EndRequest_AdditionalFunction,
        overrideMicrosoftAJAX_PageLoaded_AdditionalFunction: overrideMicrosoftAJAX_PageLoaded_AdditionalFunction
    };
}

Page Load VS Init

noreply@blogger.com (Kurniawan) — Mon, 28 Mar 2011 03:05:00 +0000

Most web developer already inherits the wrong culture of population of data.
After they graduate from college, without knowing and really understand of page life cycle and state management, They are prune to inherits the bad habits of the culture.

Here are some of the culture which you may still see it in your current project to populate an item.


<asp:DropdownList id="lstStates" runat="server"    DataTextField="StateName" DataValueField="StateCode" />

protected override void OnLoad(EventArgs args) 
{    
    if(!this.IsPostback) 
    {        
        this.lstStates.DataSource = QueryDatabase();        
        this.lstStates.DataBind();    
    }    
    base.OnLoad(e);
}

As is the nature of databound controls in ASP.NET, the state dropdown will be using ViewState to remember it's databound list of list items.

At the time of this ranting, there are a total of States or countries. Not only does the dropdown list contain a ListItem for each and every state, but each and every one of those states and their state codes are being serialized into the encoded ViewState.

That's a lot of data to be stuffing down the pipe every time the page loads, especially over a dialup connection. I often wonder what it would be like if I explained to my grandmother the reason why her internet is so slow is because her computer is telling the server what all the States / Countries are. Too bad... those extra states and countries dropdown list are really wearing down your bandwidth.

Like the problem with static data, the general solution to this problem is to just disable ViewState on the control. Unfortunately, that is not always going to work. Whether it does depends on the nature of the control you are binding, and what features of it you are dependant on.

In this example, if we simply added EnableViewState="false" to the dropdown, and removed the if(!this.IsPostback) condition, we would successfully remove the state data from ViewState, but we would immediately run into a troubling problem.

The dropdown will no longer restore it's selected item on postbacks.

WAIT!!! This is another source of confusion with ViewState.

The reason the dropdown fails to remember it's selected item on postbacks is NOT because you have disabled ViewState on it.

Postback controls such as dropdownlist and textbox restore their posted state (the selected item of a dropdown ist 'posted') even when ViewState is disabled, because even with ViewState disabled the control is still able to post its value.

It forgets it's selected value because you are rebinding it in OnLoad, which is after the dropdown has already loaded it's posted value. When you databind it again, the first thing it does is throw that into the bit bucket (you know, digital trash). That means if a user selects California from the list, then click on a submit button, the dropdown will stubbornly return the default item (the first item if you don't specify it otherwise).

Thankfully, there is an easy solution: Move the DataBind into OnInit:

<asp:DropdownList id="lstStates" runat="server"   DataTextField="StateName" DataValueField="StateCode" EnableViewState="false" />

protected override void OnInit(EventArgs args) 
{    
    this.lstStates.DataSource = QueryDatabase();    
    this.lstStates.DataBind();    
    base.OnInit(e);
}

Yes this will call QueryDatabase everytime you postback but you still can be solved it using simple caching instead of sacrificed the traffic performance in View state.

MVP or MVC

noreply@blogger.com (Kurniawan) — Mon, 28 Mar 2011 00:40:00 +0000

Recently, I am trying a very cool new architecture called WebForm MVP which comes as a mediator between Webform and MVC.

This framework is very brilliant and explain the best practice for using Webform.

For example the reason of using Page Init instead of Page load in regards of the viewstate.
This will enforce the best practice for the web developer to build there web application which now fully support for unit testing.

You can check this at http://webformsmvp.com/
and here is the contrib project which support common use presenter and Ioc Container such as Ninject and structure map.
http://webformsmvpcontrib.codeplex.com/

I believe this project will soon be adopted by VS next release.

Here is some brilliant article supported for this.
Viewstate - http://weblogs.asp.net/infinitiesloop/archive/2006/08/03/Truly-Understanding-Viewstate.aspx

Ghost node solve the crawling problem

noreply@blogger.com (Kurniawan) — Fri, 11 Feb 2011 05:29:00 +0000

Finally After solve the ghost node, My crawling search start working again.

This query safe my time.

SELECT * FROM umbracoNode, 
WHERE 
nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972' -- that are of type 'Content'
AND
umbracoNode.id NOT IN (SELECT nodeId FROM cmsContent) -- but are not in the 'Content' table

Fix for No Document exists with Version '00000000-0000-0000-0000-000000000000' when sorting

noreply@blogger.com (Kurniawan) — Fri, 11 Feb 2011 05:17:00 +0000

Finally I found what may cause the problem.

It’s because I installed runway sitemap and in some reason, it create a ghost node

http://our.umbraco.org/forum/getting-started/questions-about-runway-and-modules/10685-No-Document-exists-with-Version-%2700000000-0000-0000-0000-000000000000%27?p=0#comment40259

Do a select first to check

select * FROM umbracoNode
WHERE
umbracoNode.nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972' -- that are of type 'Content'
AND
umbracoNode.id NOT IN (SELECT nodeId FROM cmsContent) -- but are not in the 'Content' table

===

and delete that node.

Delete FROM umbracoNode
WHERE
umbracoNode.nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972' -- that are of type 'Content'
AND
umbracoNode.id NOT IN (SELECT nodeId FROM cmsContent) -- but are not in the 'Content' table

Umbraco Debug Script

noreply@blogger.com (Kurniawan) — Fri, 28 Jan 2011 04:23:00 +0000

Add this to your bookmark can be easier to debug Umbraco Macro error

javascript:window.location=window.location+'?umbDebugShowTrace=true';

Session in Umbraco

noreply@blogger.com (Kurniawan) — Wed, 12 Jan 2011 06:54:00 +0000

After looking around to fix things, finally I reliase that my session is always null in Umbraco.

Which is unexpected accident for umbraco, and after couple hours, luckily I found the reason and how to solve it.

Here is the reference.

http://our.umbraco.org/forum/developers/extending-umbraco/4433-Accessing-Session-State-in-User-Control

you just need to add in web.config if you use IIS7

<modules runAllManagedModulesForAllRequests="True">