ajpo-amber
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amber
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    <title>Jtalk Smalltalk</title>
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	  <li><a href="#header">Overview</a></li> · 
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		<h1><img alt="Jtalk is an implementation of the Smalltalk language that runs on the JavaScript runtime." src="images/title_container1.png"/></h1>
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		  <p>Jtalk is an implementation of the  <a href="http://en.wikipedia.org/wiki/Smalltalk">Smalltalk</a> language that runs on top of the <a href="http://en.wikipedia.org/wiki/Javascript">JavaScript</a> runtime. It is designed to make client-side development faster and easier.</p>
		  <p>Jtalk is written in itself, including the parser and compiler. Jtalk compiles into efficient JavaScript, mapping one-to-one with the equivalent JavaScript. There is no interpretation at runtime.</p>
		  <p>Try a <button onClick="smalltalk.Browser._open()"> Class browser</button> right now!</p>
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	      <h2>Client-side usage</h2>
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		<p>Load the full Jtalk Smalltalk environment with the IDE in your page:</p> 
		<pre>&lt;script src="js/jtalk.js" type="text/javascript"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" type="text/css" href="css/jtalk.css"/&gt;</pre>
		<p>Or the deployment JavaScript file only (without the Smalltalk parser or compiler):</p>
		<pre>&lt;script src="js/jtalk.deploy.js" type="text/javascript"&gt;&lt;/script&gt;</pre>
		<p>Read the <a href="#documentation">documentation</a> to learn more about writing applications in Jtalk.</p>
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		<p>You can get a copy of Jtalk from github or clone the <a href="http://github.com/NicolasPetton/jtalk">git repository</a>.</p> 
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	    <h2>Documentation</h2>
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	      <h3 id="intro">1. Introduction <a href="#intro">&para;</a></h3>

	      <p class="warning">This documentation is a work in progress.</p>

	      <p class="information">Jtalk is a young piece of code and evolves quickly. Some features are still incomplete and you may very well encounter bugs.</p>
	      <p>Jtalk is an implementation of the Smalltalk-80 language. It allows developers to write client-side heavy web applications in Smalltalk. Jtalk includes an integrated development environment with a class browser, workspace and transcript.</p>
	      <p>Jtalk includes the following features:</p>
	      <ol>
		<li>It is semantically and syntaxically equivalent to <a href="http://www.pharo-project.org">Pharo Smalltalk</a> (the implementation considered as the reference)</li>
		<li>It is written in itself and compiles into efficient JavaScript</li>
		<li>A canvas API similar to <a href="http://www.seaside.st">Seaside</a> to generate HTML</li>
		<li>A <a href="http://www.jquery.com">jQuery</a> binding</li>
	      </ol>

	      <h3 id="differences-other-smalltalks">2. Differences with other Smalltalk implementations <a href="#differences-other-smalltalks">&para;</a></h3>

	      <h3 id="committing">3. Committing changes to disk with the web-based IDE <a href="#committing">&para;</a></h3>
	      
	      <p>The class browser is able to commit changes to disk. The <code>commit category</code> button will send a PUT request with the compiled JavaScript code of all classes in the selected class category in a file named <code>js/CATEGORY.js</code>.</p>
	      <p>The easiest way to enable committing is probably to setup a webdav with Apache.</p>
	      <p class="information">The following steps explain how to setup a webdav for Jtalk with Debian, but the setup on OSX and other Linux distros should be similar.</p>
	      <h4>Installing Apache and enabling the dav module</h4>
	      <p>Evaluate the following as root:</p>
	      <pre>~# apt-get install apache2
~# a2enmod dav
~# a2enmod dav_fs</pre>

	      <h4>Creating a password for the webdav</h4>
	      <pre>htpasswd -c /etc/apache2/htpasswd-webdav USERNAME</pre>

	      <h4>Setting up the webdav directory</h4>
	      <p>Add the following lines to the default vhost (in /etc/apache2/sites-available/default):</p>
	      <pre>Alias /jtalk/ "/path/to/jtalk/"
&lt;Directory "/path/to/jtalk/"&gt;
    Options Indexes MultiViews FollowSymLinks
    DirectoryIndex index.html
    AllowOverride None
        Order allow,deny
    allow from all

    Dav on

    AuthType Basic
    AuthName "jtalk"
    AuthUserFile /etc/apache2/htpasswd-webdav
    &lt;LimitExcept GET OPTIONS&gt;
            Require valid-user
    &lt;/LimitExcept&gt;

&lt;/Directory&gt;</pre>
	      <p>Make sure the group www-data has required rights to modify files in the webdav directory.</p>
		
	      <h4>Restarting Apache</h4>

	      <p>To restart Apache, evaluate the following: <pre>~# /etc/init.d/apache2 restart</pre> and go to <code>http://localhost/jtalk/</code>.</p>
	      <p>The class browser should now be able to commit changes to disk.</p>

	      <h3 id="counter-example">4. The counter example <a href="#counter-example">&para;</a></h3>

	      <p>The following example is the traditional Seaside-like multi-counter application. The buttons at the bottom of each counter increase or decrease the counter.</p>

	      <div id="counters"></div>
	      <script type="text/javascript">
		jQuery(document).ready(function() {'#counters'._asJQuery()._append_(smalltalk.Counter._new())._append_(smalltalk.Counter._new())});
	      </script>

	      <p>Open a  <button onclick="smalltalk.Browser._openOn_(smalltalk.Counter);">browser</button> on the <code>Counter</code> class in the <code>Canvas</code> class category.
		<p>Each Jtalk widget is a subclass of <code>Widget</code>. A widget is a graphical component. The <code>#renderOn:</code> method is used to generate HTML using the HTML canvas.</p>

		<h3 id="html-canvas">5. The HTML canvas <a href="#html-canvas">&para;</a></h3>
		<h3 id="widgets">6. Widgets <a href="#widgets">&para;</a></h3>
		<h3 id="jquery">7. jQuery <a href="#jquery">&para;</a></h3>

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	<p>Copyright © 2011 <a href="mailto:petton.nicolas@gmail.com">Nicolas Petton</a>.</p>
	<p>Jtalk is an opensource project sponsored by <a href="http://www.objectfusion.fr">objectfusion</a>.</p>
	<p>The design of this website was kindly provided by <a href="mailto:neomie.thirion@gmail.com">Noémie Thirion</a>.</p>
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