Coding Everyday

How to deploy a HTML5 project on Google App Engine (http://appspot.com)

2013-10-15T15:17:00.001-07:00

How to deploy a HTML5 project on Google App Engine (appspot.com)

Step-by-step tutorial showing how to use appspot.com to deploy and host your HTML5 projects.

Steps

Signup to Google App Engine
Download, install, and setup Eclipse IDE
Deploy your application

Before we get started, let me give you a few features that makes Google App Engine a really good alternative to you host your projects.

App Engine applications are easy to build, easy to maintain, and easy to scale as your traffic and data storage needs grow. With App Engine, there are no servers to maintain: You just upload your application, and it's ready to serve your users.

With App Engine, you only pay for what you use. There are no set-up costs and no recurring fees. The resources your application uses, such as storage and bandwidth, are measured by the gigabyte, and billed at competitive rates. You control the maximum amounts of resources your app can consume, so it always stays within your budget.

App Engine costs nothing to get started. All applications can use up to 1 GB of storage and enough CPU and bandwidth to support an efficient app serving around 5 million page views a month, absolutely free.

Run your web applications on Google's infrastructure.
Google App Engine is fully-integrated development environment
You can serve your applications with your own domain (such as http://example.com), or you can use the App Engine domain for free (just like http://emersonestrella.appspot.com)
You can use server side languages such as PHP, Java, Python, and Go.
For storage on Google App Engine you can use the App Engine

1. Signup to Google App Engine (Appspot)

Go to http://appengine.google.com and signup to App Engine with your Google Account. After that you can create your application on Google App Engine using the Admin Console. Just click the button "Create Application"...

Fill up the form...

2. Download, install, and setup Eclipse

Go to http://www.eclipse.org/downloads/ and download the lasted version "Eclipse IDE for Java EE Developers"...

Then extract and execute the binary.

Next step is to configure Google Plug-in for Eclipse. Open the Eclipse IDE and go to "Help" -> "Install new software"...

Click in the "Add..." button to add a new update site and then fill the field location with one of the following urls based on the version of Eclipse you have installed:

Eclipse 3.6: http://dl.google.com/eclipse/plugin/archive/3.2.4/3.6
Eclipse 3.5: http://dl.google.com/eclipse/plugin/archive/3.1.2/3.5
Eclipse 3.4: http://dl.google.com/eclipse/plugin/archive/2.3.3/3.4

After you add the new update site you can go back to "Help" -> "Install new software" and select the Google Plugin Update Site from the list...

... a list of available plugins and tools will be populated. Choose the "Google Plugin for Eclipse" and click "Next >". After that restart Eclipse and the Google Plugin will be available.

3. Deploy your application

Create a new project on Eclipse to "hold" your application. To do that go to "File" -> "New Project" -> "Google" -> "Web Application Project"...

Add the project files under the folder "war" that is inside your project folder on Eclipse Workspace.

Before deploy your application to Google App Engine you have to link your Eclipse project to the application that you have created using the App Engine Console (Step #1). To do that you have to edit two little things in the file: "../war/WEB-INF/appengine-web.xml"

Add the same name of the application you have created on App Engine Console between the application tag...

<application>my-application</application>

Add the application version number between the version tag...

<version>0.1</version>

Now you're ready to deploy your application. Sign in with your Google Account by clicking in the bottom right button "Sign in to Google"...

And finally, click on the Google button in the menu bar and choose the option: "Deploy to App Engine"...

After that the upload process will start and in a few seconds your application will be available on Google App Engine.

That is all. Hope that help you guys who are wondering how to use Google App Engine. If you find any problem during this process, please leave a comment. Thanks!

Focus on process, not outcome

2013-03-31T17:51:00.004-07:00

Focus on process, not outcome

By default we tend to be forward-looking, goal-pursuing, results-focused.

But focusing on process rather than outcome is a much better strategy. Why?

It eliminates the noise of external factors.

It encourages experimentation.

It lets you enjoy the process more.

And you also enjoy and benefit more from the outcomes.

by Tom Murcko

HTML5 Shape Puzzle - HTML5 Version of the game the preschool kids love

2013-03-05T17:12:00.003-08:00

HTML5 Shape Puzzle - HTML5 Version of the game the preschool kids love

Including music, sound, touch support, responsive design, and 20 stages

http://shapepuzzle.appspot.com

HTML5 Shape Puzzle Game

How to grab YouTube playback video files

2013-03-03T09:43:00.000-08:00

How to grab YouTube playback video files

Step-by-step tutorial showing how to get all available video source files from a video on YouTube using only Javascript. No plugins and/or server side scripts are required.

First of all I want to list here a few benefits from being able to do that.

You can download any video from YouTube without plugins or server-side scripts. You just need a browser.
You can use YouTube as an encoder. Let's say you have to convert a FLV video to MP4 or
WebM.
You can set a cron job to run once a week to download all available video files from any channel.
You can play any YouTube video out of the YouTube player (not recommend).
You can play YouTube videos on HTML5 canvas and go crazy! Check this out at: http://videopuzzle.possum-cms.com

How to do it

Live demo: http://keepvideos.possum-cms.com or http://keepvideos.appspot.com

Source code: https://github.com/edse/keepvideos

Step 1: Extract YouTube video ID from URL

  var url = 'http://www.youtube.com/watch?v=yntfUjenls0';  
  var video_id = '';  
  var regExp = /.*(?:youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=)([^#\&\?]*).*/;  
  var match = url.match(regExp);  
  if(match){  
   video_id = match[1];  
  }

Step 2: Request YouTube playback files information

Easy as pie. Just make an Ajax request to: http://www.youtube.com/get_video_info sending the desired video ID...

  $.ajax({  
   url: "http://www.youtube.com/get_video_info?video_id="+video_id,  
   dataType: "text"  
  }).done(function(data) {  
   ...  
  });

Step 3: Parse the response data information from YouTube

The information that we are looking for is "url_encoded_fmt_stream_map". This variable contains all streams available for the requested movie.

 function(data) {  
  var info = {};  
  parse_str(data, info);  
  var streams = explode(',', info['url_encoded_fmt_stream_map']);  
  ...

Step 4: Trick. Parse again each one of the streams

YouTube encode the information twice, so you have to parse it again.
There is other trick here, You also have to add a signature value on each stream url, otherwise it won't work.

  var results = [];  
  for(var i=0; i<streams.length; i++){  
   var real_stream = {};  
   parse_str(streams[i], real_stream);  
   real_stream['url'] += '&signature=' + real_stream['sig'];  
   results.push(real_stream);  
  }

Step 5: Have fun!

By now you should have a variable "results" with all YouTube video files available for the requested movie.

You can do whatever you want with the files. For example: display a link, play the video, grab snap shots of the video... Have fun!

To display the a link for each video file available...

   if(results.length > 0){  
    $.each(results, function(index, value) {  
     $('#results').append('<a href="'+value.url+'">'+value.quality+' - '+value.type</a>');  
    });  
   }

How to play a video on HTML5 canvas tag

2012-10-18T19:33:00.000-07:00

How to play a video on HTML5 canvas tag

Step-by-step tutorial on how to play a video on HTML5 canvas tag

LIVE DEMO

First you need a video file. Actually, two. One video file in ogg format (for Chrome and Firefox) and the other one in mp4 format (for Safari). To get any video in these file formats you can use a website like www.online-convert.com or www.mediaconverter.org.

Once you have the video files, the next step is to create a simple HTML page with one canvas tag, and one video tag. Just like the code below.

 <!DOCTYPE html>  
 <head>  
 <title>Playing YouTube video on HTML5 canvas</title>  
 </head>  
 <body>  
  <video id="video" autoplay="true" loop="true">  
   <source src="./video/BigBuckBunny_640x360.ogv" type="video/ogg" />  
   <source src="./video/BigBuckBunny_640x360.mp4" type="video/mp4" />  
  </video>  
  <canvas id="canvas"></canvas>  
 </body>  
 </html>

Right now, you should be able to test the video and check if it is playing well on Chrome Safari and Firefox.

Next, we add some CSS and a new hidden div wrapping the video tag.

 <!DOCTYPE html>  
 <head>  
 <title>Playing YouTube video on HTML5 canvas</title>  
 </head>  
 <body>  
  <video id="video" autoplay="true" loop="true">  
   <source src="./video/BigBuckBunny_640x360.ogv" type="video/ogg" />  
   <source src="./video/BigBuckBunny_640x360.mp4" type="video/mp4" />  
  </video>  
  <canvas id="canvas"></canvas>  
 </body>  
 </html>

Since we will be rendering the video on canvas, we need to make the video hidden. But we will be using the audio from the video tag.

Now the only missing piece is the javascript that renders the video on canvas. To do this we need to grab a image from the video and then paint this image on canvas. If we repeat this process every X milliseconds... TA-DA! We have the video playing on canvas.

Here is the full source code:

 <!DOCTYPE html>  
 <head>  
 <title>Playing YouTube video on HTML5 canvas</title>  
 <meta name="viewport" content="user-scalable=no, initial-scale=1.0, maximum-scale=1.0, width=device-width" />  
 <style type="text/css">  
  html, body {  
   width: 100%;  
   height: 100%;  
   padding: 0px;  
   margin: 0px;  
  }  
  #canvas {  
   padding: 0px;  
   margin: 0px;  
   top:0;  
   left:0;  
   z-index: 30;  
   position: absolute;  
   width: 100%;  
   height: 100%;  
  }  
 </style>  
 </head>  
 <body>  
  <div style="display: none;">  
   <video id="video" autoplay="true" loop="true">  
    <source src="./video/BigBuckBunny_640x360.ogv" type="video/ogg" />  
    <source src="./video/BigBuckBunny_640x360.mp4" type="video/mp4" />  
   </video>  
  </div>  
  <canvas id="canvas"></canvas>  
  <script>  
  document.addEventListener('DOMContentLoaded', function(){  
   var v = document.getElementById('video');  
   var canvas = document.getElementById('canvas');  
   var context = canvas.getContext('2d');  
   //var cw = Math.floor(canvas.clientWidth / 100);  
   //var ch = Math.floor(canvas.clientHeight / 100);  
   var cw = Math.floor(canvas.clientWidth);  
   var ch = Math.floor(canvas.clientHeight);  
   canvas.width = cw;  
   canvas.height = ch;  
   v.addEventListener('play', function(){  
    draw(this,context,cw,ch);  
   },false);  
  },false);  
  function draw(v,c,w,h) {  
   if(v.paused || v.ended) return false;  
   c.drawImage(v,0,0,w,h);  
   setTimeout(draw,20,v,c,w,h);  
  }  
  </script>  
 </body>  
 </html>

If you want to play a video from YouTube, check this tutorial: Playing YouTube videos on HTML5 canvas with Javascript.

If you want to download a video from YouTube, check this one: Download YouTube video files with Javascript

Next, I'll show you how to make a simple HTML5 game puzzle. Stay tuned!

Download YouTube video files with Javascript

2012-10-17T00:21:00.001-07:00

UPDATED!

Check the new blog post: http://coding-everyday.blogspot.com/2013/03/how-to-grab-youtube-playback-video-files.html

Live demo: http://keepvideos.possum-cms.com or http://keepvideos.appspot.com

Download YouTube video files with Javascript

How to download YouTube videos files with Javascript only! Is it possible?

YES! It is possible! And without relying in any kind of server side scripts!

LIVE DEMO: KeepVideos

Libraries needed to do this:

jQuery

Step-by-step: Downloading YouTube videos with Javascript.

Part 1: Get the YouTube video URL from an input and validate the URL using regular expression.

  var url = $('#url').val();  
  var regExp = /.*(?:youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=)([^#\&\?]*).*/;  
  var match = url.match(regExp);  
  if(match){  
   $('#download-btn').fadeOut('fast');  
   $('#loading').fadeIn('slow');  
   setTimeout("getVideo('"+match[1]+"')",2000);  
  }  
  else{  
   alert('Invalid URL!');  
   $('#url').val("");  
   $('#url').focus();  
  }

Part 2: Retrive raw video information from YouTube

Make an Ajax call to http://www.youtube.com/get_video_info?video_id=XXX

 $.ajax({  
  url: "http://www.youtube.com/get_video_info?video_id="+id,  
  dataType: "text"  
 }).done(function(data) {
  ...

Part 3: Prepare information to be parsed. We need to do 3 things:

a) Replace all occurrences of the character "\" to "%20"
```
 data = (data+'').replace(/\+/g, '%20');  
```
b) Replace all occurrences of the string "url%3D" to "\n\r<break>"
```
 data = data.replace(/url%3D/g, '\n\r\n\r<break>');  
```
c) Replace all occurrences of the string "sig%3D" to "signature%3D"
```
 data = data.replace(/sig%3D/g, 'signature%3D');  
```

Part 4: Grab all files URLs from this YouTube video

  var urls = data.split('<break>');   
  for(var u = 0; u < urls.length; u++){   
  var result = {};   
  ...   
  }

Part 5: Prepare each URL to be parsed

a) Decode the URL
```
 decodeURIComponent((urls[u]+'')  
```
b) Replace all occurrences of the character "\" to "%20"
```
 url = url.replace(/\+/g, '%20');  
```
c) Unescape the result twice
```
 url = unescape(unescape(url));  
```
d) Replace all occurrences of the string '="' to '%3D%22'
```
 url = url.replace(/="/g, '%3D%22');  
```
e) Replace all occurrences of the character '"' to "%22"
```
 url = url.replace(/"/g, '%22');  
```

Part 6: Return a list for the videos URLs present in the YouTube results.

a) Parse all variables present in each URL

 var vars = [], hash;  
 var hashes = d.slice(d.indexOf('?') + 1).split('&');  
 for(var i = 0; i < hashes.length; i++){  
  hash = hashes[i].split('=');  
  vars.push(hash[0]);  
  vars[hash[0]] = unescape(hash[1]);  
 }

b) Grab the video type and codecs from the URL parameters

 if(vars['type']!=undefined){  
  result.type = vars['type'];  
  if(vars['type'].indexOf("codecs")>0){  
   var cs = vars['type'].split(';+codecs="');  
   result.type = cs[0];  
   result.codecs = cs[1].replace('"','').replace('+',' ');  
  }  
 }

c) Grab the video quality from the URL parameters

 //quality  
 if(vars['quality']!=undefined){  
  result.quality = vars['quality'];  
  if(vars['quality'].indexOf(",")>0){  
   var cs = vars['quality'].split(',');  
   result.quality = cs[0];  
  }  
 }

That is it. Now you have all information needed in the result object. Here is the full source-code:

 /* Author: Emerson Estrella */  
 $('#again').click(function() {  
  $('#hero2').fadeOut('fast');$('#hero1').fadeIn('slow');  
 });  
 $('#form').submit(function() {  
  var url = $('#url').val();  
  var regExp = /.*(?:youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=)([^#\&\?]*).*/;  
  var match = url.match(regExp);  
  if(match){  
   $('#download-btn').fadeOut('fast');  
   $('#loading').fadeIn('slow');  
   setTimeout("getVideo('"+match[1]+"')",2000);  
  }  
  else{  
   alert('Invalid URL!');  
   $('#url').val("");  
   $('#url').focus();  
  }  
  return false;  
 });  
 function getVideo(youtube_video_id){  
  var id = "b4VsluhWVh8";  
  id = youtube_video_id;  
  $.ajax({  
   url: "http://www.youtube.com/get_video_info?video_id="+id,  
   dataType: "text"  
  }).done(function(data) {  
   var results = [];  
   var r = 0;  
   data = (data+'').replace(/\+/g, '%20');  
   data = data.replace(/url%3D/g, '\n\r\n\r<break>');  
   data = data.replace(/sig%3D/g, 'signature%3D');  
   var urls = data.split('<break>');  
   for(var u = 0; u < urls.length; u++){  
    var result = {};  
    var d = unescape(unescape(decodeURIComponent((urls[u]+'').replace(/\+/g, '%20'))));  
    d = d.replace(/="/g, '%3D%22');  
    d = d.replace(/"/g, '%22');  
    var url = d;  
    //console.log(d);  
    //console.log(d.length);  
    if(d.length > 1500){  
     aux = d.split('&has_cc');  
     d = aux[0];  
    }  
    var vars = [], hash;  
    var hashes = d.slice(d.indexOf('?') + 1).split('&');  
    for(var i = 0; i < hashes.length; i++){  
     hash = hashes[i].split('=');  
     vars.push(hash[0]);  
     vars[hash[0]] = unescape(hash[1]);  
    }  
    if(vars['type']!=undefined){  
     result.type = vars['type'];  
     if(vars['type'].indexOf("codecs")>0){  
      var cs = vars['type'].split(';+codecs="');  
      result.type = cs[0];  
      result.codecs = cs[1].replace('"','').replace('+',' ');  
     }  
    }  
    //quality  
    if(vars['quality']!=undefined){  
     result.quality = vars['quality'];  
     if(vars['quality'].indexOf(",")>0){  
      var cs = vars['quality'].split(',');  
      result.quality = cs[0];  
     }  
    }  
    if(result.type && result.quality){  
     result.url = url;  
     results[r] = result;  
     r++;  
    }  
   }  
   //console.log(results);  
   //print results  
   var html = '';  
   html += '<h4 class="alert-heading" style="margin-top: 25px;">All video files found for your request</h4>';  
   html += '<a id="again" style="margin-top: 25px;" class="btn btn-small btn-danger" href="#main" onclick="$(\'#hero2\').fadeOut(\'fast\');$(\'#hero1\').fadeIn(\'slow\');"><i class="icon-repeat icon-white"></i> Make Another Request</a>';  
   html += '<table class="table table-striped musica" style="background: rgba(255,255,255,0.7); margin-top:25px;"><thead><tr><th>Quality</th><th>Format</th><th>Codecs</th><th style="text-align: right;"></th></tr></thead><tbody>';  
   $.each(results, function(index, value) {  
    html += '\n\r<tr>';  
    html += '<td>'+value.quality+'</td>';  
    html += '<td>'+value.type+'</td>';  
    if(value.codecs!=undefined)  
     html += '<td>'+value.codecs+'</td>';  
    else  
     html += '<td>N/A</td>';  
    html += '<td><a class="btn btn-success pull-left" href="'+value.url+'" style="margin-right: 15px;"><i class="icon-download-alt icon-white"></i> Download this video format file</a></td>';  
    html += '</tr>\n\r';  
   });  
   html += '</tbody></table><a style="margin-top: 10px; margin-bottom: 25px;" class="btn btn-small btn-danger" href="#main" onclick="$(\'#hero2\').fadeOut(\'fast\');$(\'#hero1\').fadeIn(\'slow\');"><i class="icon-repeat icon-white"></i> Make Another Request</a>';  
   $('#vid').html(html);  
   $('#vid').fadeIn('slow');  
   $('#loading').hide();  
   $('#hero1').hide();  
   $('#hero2').fadeIn('slow');  
   $('#download-btn').show();  
  });  
 }

LIVE DEMO: KeepVideos

In the next post I'll explain how to Download YouTube video files from a server side script like PHP. Stay tuned!

Playing YouTube videos on HTML5 canvas with Javascript

2012-10-17T00:14:00.000-07:00

Playing YouTube videos on HTML5 canvas with Javascript

How to play YouTube videos on HTML5 canvas tag

This blog post is coming soon. Stay tuned!

Step-by-step creating a HTML5 image puzzle game

2012-10-13T21:40:00.001-07:00

Step-by-step creating a HTML5 image puzzle game

How to create a HTML5 image puzzle game with images, canvas, audio and fullscreen support.

Demo: HTML5 Image Puzzle Game

Source code: github.com/edse/puzzle

Tutorial coming soon

Adsense - Responsive Ads using a Javascript interface

2012-10-13T17:26:00.004-07:00

Adsense - Responsive Ads with a Javascript interface

How to make responsive ads using Javascript

So, the idea is check the user screen size and then based on that value show up the ads.

In my case I have the following set:

Desktop

Leaderboard (728x90)

Portrait tablet to landscape and desktop

Banner (468x60)

Landscape phone to portrait tablet

Banner (468x60)

Landscape phones and down

Half Banner (234x60)

See the source code example:

 <script type="text/javascript">  
       google_ad_client = "ca-pub-XXXXXX";  
       google_ad_slot = "";  
       if(window.innerWidth >= 800) {  
        //visible-desktop  
        //Medium Rectangle  
        google_ad_slot = "xxxxxxx";  
        google_ad_width = 300;  
        google_ad_height = 250;  
       }  
       else if((window.innerWidth > 480)&&(window.innerWidth < 800)) {  
        //visible-tablet  
        //Square  
        google_ad_slot = "xxxxxxx";  
        google_ad_width = 250;  
        google_ad_height = 250;  
       }  
       else if(window.innerWidth <= 480) {  
        //visible-phone  
        //Large Rectangle  
        google_ad_slot = "xxxxxxx";  
        google_ad_width = 336;  
        google_ad_height = 280;  
       }  
       if(google_ad_slot != "")  
        document.write('1: <scr'+'ipt type=\"text/javascript\" src=\"http://pagead2.googlesyndication.com/pagead/show_ads.js\"></scri'+'pt>');  
       </script>

Are you using Twitter Bootstrap? If so, you can make the same thing quite easier. Take a look!

Adsense - Responsive Ads with CSS @media queries from Bootstrap responsive utility classes

2012-10-12T12:18:00.001-07:00

Adsense - Responsive Ads with Bootstrap and CSS @media queries

Twitter Bootstrap is built with Responsive utility classes that help us to implement different sizes of ads for different devices.

Class	Phones767px and below	Tablets979px to 768px	DesktopsDefault
`.visible-phone`	Visible	Hidden	Hidden
`.visible-tablet`	Hidden	Visible	Hidden
`.visible-desktop`	Hidden	Hidden	Visible
`.hidden-phone`	Hidden	Visible	Visible
`.hidden-tablet`	Visible	Hidden	Visible
`.hidden-desktop`	Visible	Visible	Hidden

So, the idea is to use these classes to show the right ads. In my case I have the following set:

Desktop

Leaderboard (728x90)

Portrait tablet to landscape and desktop

Banner (468x60)

Landscape phone to portrait tablet

Banner (468x60)

Landscape phones and down

Half Banner (234x60)

It is really simple to achieve this using the Bootstrap built-in responsive utility classes. See the example bellow:

 <div class="visible-desktop">  
        <script type="text/javascript">  
             google_ad_client = "ca-pub-XXXXXX";  
             google_ad_slot = "XXXXXXX";  
             google_ad_width = 728;  
             google_ad_height = 90;  
        </script>  
        <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>   
 </div>

 <div class="visible-tablet">  
        <script type="text/javascript">  
             google_ad_client = "ca-pub-XXXXXX";  
             google_ad_slot = "XXXXXXX";  
             google_ad_width = 468;  
             google_ad_height = 60;  
        </script>  
        <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>
 </div>

 <div class="visible-phone">  
        <script type="text/javascript">  
             google_ad_client = "ca-pub-XXXXXX";  
             google_ad_slot = "XXXXXXX";  
             google_ad_width = 234;  
             google_ad_height = 60;  
        </script>  
        <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>
 </div>

Easy uh?!

Here is a example showing how we can make the same thing using Javascript only.

iOS 5.1.1 Development on Xcode 4.3 - Testing on real device without an Apple Provisioning Profile

2012-09-09T16:42:00.004-07:00

iOS 5.1.1 Development on Xcode 4.3

Testing on real device without an Apple Provisioning Profile

After a two long days, today I was able to build and run an iOS 5.1.1 from Xcode straight to my device.

To do this you will need:

Jailbroken iPhone, iPad or iPod
Appsync installed on device
Xcode 4.3+

Step 1: Create a new self-signed code-signing certificate using Keychain Access

Open the Keychain Access application
Go to Menu "Keychain Access" -> "Certificate Assistant" -> "Create a Certificate"
Choose an unique name, easier to remember. You will need that name latter on.
Choose "Self Signed Root" for "Identity Type"
Choose "Code Signing" for "Certificate Type"
Check "Let me override defaults"
And then click "Create"
Click next to all following questions without changing anything

Step 2: Edit Xcode "Info.plist" file

Open the file: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Info.plist
Replace the three occurrences of "XCiPhoneOSCodeSignContext" by "XCCodeSignContext"
Save the file and restart Xcode

Step 3: Install Appsync

Intall "Appsync" application from Cydia
Intall "SSH" application from Cydia
Log into your device via SSH and create a blank file called "tdmtanf" in "/var/mobile"

Step 4: Xcode Project Setup

Open your project on Xcode
Go to "Project" -> "Build Settings" -> "Code Signing" -> "Code Signing Identity" -> Choose the identity related to the certificate that you created on step 1 on settings for debug and release.
Make exactly the same thing on "Targets" -> "Build Settings" -> "Code Signing" -> "Code Signing Identity"

Now you should be able to build and run your project from Xcode to your device.

Touch != mouse

2012-07-01T12:28:00.002-07:00

Touch != mouse

No hover state
Multiple points
Less precise input
Fingers aren't (x, y), but also have shape
Future: Pressure? Haptic feedback? Hover?

This is why I love cache...

2012-06-26T21:27:00.003-07:00

This is why I love cache...

HTML5 Puzzle Chrome Experiment

2012-06-23T11:22:00.000-07:00

HTML5 Puzzle Chrome Experiment

http://www.chromeexperiments.com/detail/html5-puzzle/

HTML5 Puzzle

Conventional Debugging vs. TDD

2012-06-22T19:55:00.001-07:00

Conventional Debugging vs. TDD

Conventional

Write 10s of lines, run, hit bug: break out debugger
Insert printfʼs to print variables while running repeatedly
Stop in debugger, tweak/set variables to control code path
Dammit, I thought for sure I ﬁxed it, now have to do this all again

TDD

Write a few lines, with test ﬁrst; know immediately if broken
Test short pieces of code using expectations
Use mocks and stubs to control code path
Re-run test automatically

Testing Software

2012-06-15T20:06:00.000-07:00

Testing Software

Before

Developers ﬁnish code, some ad-hoc testing
“toss over the wall to Quality Assurance [QA]”
QA people manually poke at software

Today

Testing is part of every Agile iteration
Developers responsible for testing own code
Testing tools & processes highly automated;
QA/testing group improves testability & tools

Software quality is the result of a god process, rather than the responsibility of one specific group.

HTML5 - Javascript Performance Tests - jsperf.com

2012-05-07T23:51:00.003-07:00

jsperf is one of the best things I have seen this year. It is a powerful test engine for Javascript.

Every test created is public, and listed there. So anybody can test it, in any platform or browser and all test results are keept. So as more people runs each test, more analysis data we have.

To see how it works, and also to answer one question regarding the performance of drawing text with shadow on canvas, I have setup a test on jsperf.

http://jsperf.com/requestanimationframe-canvas-drawing-text-shadows

As I only tested on Chrome and Firefox what I can say for now is:

On Chrome 18.0 the performance dorps by almost half when drawing texts with shadows.

On Firefox 12.0 is the same thing. Doesn't matter it keep the same performance, but comparing the results Chrome is almost 50% faster than Firefox when drawing texts without shadows.

Remember that it is only a test and I have only test it on my computer.

HTML5 AppCache API - How to prevent browser caching unsupported resources in manifest file

2012-04-28T18:04:00.001-07:00

The method describe below doesn't work in all browsers.

For now I'm using two different html files. But the best solution is on server side, making a rewrite rule for redirecting the user to the correct manifest file.

I'm writing a web application that uses the AppCache API for offline browsing. But I'm also using the Audio API to play back-ground music and a few audio effects.

For audio support in different browsers I'm delivering each sound/music in two different file formats: OGG and MP3.

The problem is regarding the cache manifest file. If we add all audio files (MP3 and OGG) in the cache manifest file, all browsers will cache all files. Including the unsupported ones. So, we end up with a huge storage requirement. Which is really bad if you are on a 3G connection for example.

So, to prevent browser caching unsupported resources, the best approach I've found was to split the manifest file. This way we can tell browsers that sopport OGG files to cache only OGG files, and do tha same for other formats like MP3.

Ok then. I have two manifest cache files, one with all OGG files listed (ogg.appcache) and the other one with the MP3 files (mp3.appcache).

Now what!? How do I swap from one to other?

Easy. First we should consider the browser supports OGG. If so, we can add the manifest attribute into the html tag with the right manifest file, just like that:


<html manifest="ogg.appcache">

Now, we have to check if the browser supports MP3. If it does, we change the value of the attribute "manifest" from the html tag. We can do that with this javascript:


var audio = document.createElement('audio');

if(audio.canPlayType('audio/mpeg;'))

  document.documentElement.setAttribute("manifest", document.documentElement.getAttribute("manifest").replace('ogg','mp3'));

HTML5 Polyfills - Fullscreen & RequestAnimationFrame APIs

2012-04-23T22:29:00.002-07:00

So far, those are the best polyfills for using Fullscreen and RequestAnimationFrame features from HTML5 on today's browsers.

RequestAnimationFrame API

Optimize concurrent animations together into a single reflow and repaint cycle, leading to higher fidelity animation, and using less CPU, GPU, memory, and battery.

http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

Fullscreen API

Provides an easy way for web content to be presented using the user's entire screen.

https://github.com/sindresorhus/screenfull.js

Coding Everyday

How to deploy a HTML5 project on Google App Engine (http://appspot.com)

How to deploy a HTML5 project on Google App Engine (appspot.com)

Step-by-step tutorial showing how to use appspot.com to deploy and host your HTML5 projects.

Steps

1. Signup to Google App Engine (Appspot)

2. Download, install, and setup Eclipse

3. Deploy your application

Focus on process, not outcome

Focus on process, not outcome

By default we tend to be forward-looking, goal-pursuing, results-focused.

But focusing on process rather than outcome is a much better strategy. Why?

It eliminates the noise of external factors. It encourages experimentation. It lets you enjoy the process more. And you also enjoy and benefit more from the outcomes. by Tom Murcko

HTML5 Shape Puzzle - HTML5 Version of the game the preschool kids love

HTML5 Shape Puzzle - HTML5 Version of the game the preschool kids love

Including music, sound, touch support, responsive design, and 20 stages

http://shapepuzzle.appspot.com

How to grab YouTube playback video files

How to grab YouTube playback video files

Step-by-step tutorial showing how to get all available video source files from a video on YouTube using only Javascript. No plugins and/or server side scripts are required.

How to do it

Step 1: Extract YouTube video ID from URL

Step 2: Request YouTube playback files information

How to play a video on HTML5 canvas tag

How to play a video on HTML5 canvas tag

Step-by-step tutorial on how to play a video on HTML5 canvas tag

Download YouTube video files with Javascript

UPDATED!

Download YouTube video files with Javascript

How to download YouTube videos files with Javascript only! Is it possible?

YES! It is possible! And without relying in any kind of server side scripts!

Playing YouTube videos on HTML5 canvas with Javascript

Playing YouTube videos on HTML5 canvas with Javascript

How to play YouTube videos on HTML5 canvas tag

Step-by-step creating a HTML5 image puzzle game

Step-by-step creating a HTML5 image puzzle game

How to create a HTML5 image puzzle game with images, canvas, audio and fullscreen support.

Demo: HTML5 Image Puzzle Game

Source code: github.com/edse/puzzle

Tutorial coming soon

Adsense - Responsive Ads using a Javascript interface

Adsense - Responsive Ads with a Javascript interface

How to make responsive ads using Javascript

Adsense - Responsive Ads with CSS @media queries from Bootstrap responsive utility classes

Adsense - Responsive Ads with Bootstrap and CSS @media queries

iOS 5.1.1 Development on Xcode 4.3 - Testing on real device without an Apple Provisioning Profile

iOS 5.1.1 Development on Xcode 4.3

Testing on real device without an Apple Provisioning Profile

Touch != mouse

Touch != mouse

This is why I love cache...

This is why I love cache...

HTML5 Puzzle Chrome Experiment

HTML5 Puzzle Chrome Experiment

Conventional Debugging vs. TDD

Conventional Debugging vs. TDD

Conventional

TDD

Testing Software

Testing Software

Before

Today

HTML5 - Javascript Performance Tests - jsperf.com

HTML5 AppCache API - How to prevent browser caching unsupported resources in manifest file

HTML5 Polyfills - Fullscreen & RequestAnimationFrame APIs

So far, those are the best polyfills for using Fullscreen and RequestAnimationFrame features from HTML5 on today's browsers.

RequestAnimationFrame API

Fullscreen API

It eliminates the noise of external factors.

It encourages experimentation.

It lets you enjoy the process more.

And you also enjoy and benefit more from the outcomes.

by Tom Murcko