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FB has changed a way to add FB app to FB page

2012-02-15T22:01:00.001-05:00

I was working on fb app and was not able to find a way to add app on fan page. Earlier it used to be in app's profile page but now they've discontinued app profile page so only way to add new app to a page is by using the below link.

https://www.facebook.com/dialog/pagetab?app_id=YOUR_APP_ID&next=YOUR_URL

where YOUR_APP_ID is your app's ID and for YOUR_URL I use canvas page URL

You can find more detail below(see Adding an App to a Page section):
https://developers.facebook.com/docs/appsonfacebook/pagetabs/

Setting up session in Facebook iframe app

2011-11-08T12:54:00.001-05:00

When I tried to use session in Facebook canvas iframe application, in IE browser I was having issue with session not being set up but in Chrome and FF it works. So to make it work in IE I added this below code (for ColdFusion) and it worked in IE too:

<cfheader name="P3P" value="CP='IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT'" />

Ref:
http://stackoverflow.com/questions/3871199/facebook-iframe-not-working-in-ie-session-login-issue

ASP.NET MVC Pipeline

2011-10-23T14:46:00.002-04:00

Life cycle of a request in ASP.NET MVC.

SQL to get unique entry and the date it was first entered

2011-10-16T10:59:00.000-04:00

Let's say you have this table:

Email          EnteredDate
abc@abc.com    11/1/2011
xyz@zyx.com    11/1/2011
abc@abc.com    11/2/2011

and you want to get list of unique emails and the date when it was first entered. Then this query:

SELECT email, min(EnteredDate) as FirstEntered FROM entries
GROUP BY email

will give you this result displaying unique email with the date it was first entered:

Email          FirstEntered
abc@abc.com    11/1/2011
xyz@zyx.com    11/1/2011

If you know any better solution then please share it with me.

Tool to debug Facebook's Open Graph protocol

2011-10-11T21:28:00.000-04:00

Great tool to debug Facebook's Open Graph protocol https://developers.facebook.com/tools/debug

This tool displays all Open Graph Object properties which helps us to debug the properties we have set on our pages. This way we will be sure whether we have set the properties correctly or not.

Fix for facebook iframe scrollbar issue

2011-10-10T20:11:00.002-04:00

Sometimes FB.Canvas.setAutoResize or FB.Canvas.setSize fails to remove the scrollbar from applications. To fix it you can put <body style="overflow:hidden"> in body tag.

Fix for loading non secured FB JSDK over HTTPS

2011-10-08T01:59:00.001-04:00

Set FB._https to true before calling FB.init to avoid loading non securing fb items over HTTPS.

Ref: http://stackoverflow.com/questions/5212016/facebook-javascript-sdk-over-https-loading-non-secure-items

CFHTTP issue with Connection Failure: Status code unavailable

2011-10-04T23:27:00.000-04:00

I was trying to connect to client's remote URL using CFHTTP and I was getting an error saying "Connection Failure: Status code unavailable". So to fix that I used below code and this solved by problem:

<cfobject action="Create" name="objSrvHTTP" class="MSXML2.ServerXMLHTTP">
<cfset temp = objSrvHTTP.open("GET","http://google.com")>
<cfset temp = objSrvHTTP.send("")>
<cfset myResult = objSrvHTTP.responsetext>

Show custom page for run-time exceptions occurred in servlet

2011-10-04T23:14:00.000-04:00

In Coldfusion if you see errors in servlet with a stack trace like below:

then in order to get custom error page you need to add this code

<error-page>
<error-code>500</error-code>
<location>/500.cfm</location>
</error-page>

in default-web.xml. You can find this xml in this location C:\JRun4\servers\cfusion\SERVER-INF\.

Ref: http://livedocs.adobe.com/jrun/4/Programmers_Guide/techniques_servlet12.htm

I created the above error by capturing the form post using Live HTTP Headers add on of Firefox and changing the content length and replayed the request. When I do this then cferror was not capturing that error. So had to do this way in order to show custom error.