You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@tapestry.apache.org by bu...@apache.org on 2013/09/15 00:20:58 UTC
svn commit: r878442 - in /websites/production/tapestry/content:
cache/main.pageCache javascript.html
Author: buildbot
Date: Sat Sep 14 22:20:58 2013
New Revision: 878442
Log:
Production update by buildbot for tapestry
Modified:
websites/production/tapestry/content/cache/main.pageCache
websites/production/tapestry/content/javascript.html
Modified: websites/production/tapestry/content/cache/main.pageCache
==============================================================================
Binary files - no diff available.
Modified: websites/production/tapestry/content/javascript.html
==============================================================================
--- websites/production/tapestry/content/javascript.html (original)
+++ websites/production/tapestry/content/javascript.html Sat Sep 14 22:20:58 2013
@@ -0,0 +1,568 @@
+<!DOCTYPE html>
+
+ <!--
+
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<html>
+<head>
+ <meta http-equiv="x-ua-compatible" content="IE=9">
+ <title>
+ JavaScript -- Apache Tapestry
+ </title>
+ <link type="text/css" rel="stylesheet" href="/resources/space.css">
+ <link href="/styles/style.css" rel="stylesheet" type="text/css"/>
+</head>
+<body>
+ <div class="wrapper bs">
+
+<div id="navigation"><div class="nav"><ul class="alternate" type="square"><li><a shape="rect" href="index.html" title="Index">Home</a></li><li><a shape="rect" href="getting-started.html" title="Getting Started">Getting Started</a></li><li><a shape="rect" href="documentation.html" title="Documentation">Documentation</a></li><li><a shape="rect" href="download.html" title="Download">Download</a></li><li><a shape="rect" href="about.html" title="About">About</a></li><li><a shape="rect" href="community.html" title="Community">Community</a></li><li><a shape="rect" class="external-link" href="http://www.apache.org/">Apache</a></li><li><a shape="rect" class="external-link" href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li><li><a shape="rect" class="external-link" href="http://www.apache.org/foundation/thanks.html">Thanks</a></li></ul>
+</div>
+</div>
+
+<div id="top">
+<div id="smallbanner"><div class="searchbox" style="float:right;margin: .3em 1em .1em 1em"><p>
+<span style="color: #999; font-size: 90%">Tapestry docs, issues, wikis & blogs:</span>
+</p><form enctype="application/x-www-form-urlencoded" method="get" action="http://tapestry.apache.org/search.html">
+ <input type="text" name="q">
+ <input type="submit" value="Search">
+</form>
+
+</div>
+
+<div class="emblem" style="float:left"><a shape="rect" href="index.html" title="Index"><span class="image-wrap" style=""><img src="small-banner.data/tapestry_s.png" style="border: 0px solid black"></span></a></div>
+<div class="title" style="float:left; margin: 0 0 0 3em"><h1><a shape="rect" name="SmallBanner-PageTitle"></a>JavaScript</h1></div></div>
+<div class="clearer"></div>
+</div>
+
+<div class="clearer"></div>
+
+ <div id="breadcrumbs">
+ <a href="index.html">Apache Tapestry</a> > <a href="documentation.html">Documentation</a> > <a href="user-guide.html">User Guide</a> > <a href="javascript.html">JavaScript</a>
+ <a class="edit" title="Edit this page (requires approval -- just ask on the mailing list)" href="https://cwiki.apache.org/confluence/pages/editpage.action?pageId=21792074">edit</a>
+ </div>
+
+<div id="content">
+<div id="ConfluenceContent"><div class="navmenu" style="float:right; background:#eee; margin:3px; padding:3px"><table class="tableview" width="100%"><tr><th colspan="1" rowspan="1" style="padding: 3px 3px 3px 0px">Related Articles</th></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="ajax-and-zones.html">Ajax and Zones</a>
+
+ </td></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="javascript.html">JavaScript</a>
+
+ </td></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="assets.html">Assets</a>
+
+ </td></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="ajax-components-faq.html">Ajax Components FAQ</a>
+
+ </td></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="component-cheat-sheet.html">Component Cheat Sheet</a>
+
+ </td></tr><tr><td colspan="1" rowspan="1">
+ <span class="icon icon-page" title="Page">Page:</span>
+ <a shape="rect" href="javascript-faq.html">JavaScript FAQ</a>
+
+ </td></tr></table>
+</div>
+
+<p><b>JavaScript</b> is a first-class concept in Tapestry, and sophisticated JavaScript support is provided right out of the box, including rich <a shape="rect" href="ajax-and-zones.html" title="Ajax and Zones">AJAX support</a>, download optimization, client-side logging, and localization.</p>
+
+<p>In production mode, by default, Tapestry will merge JavaScript libraries, add version numbering, and set a far-future expires header to encourage aggressive browser caching. Starting with version 5.3, Tapestry can also automatically minify (compress) JavaScript libraries when in <a shape="rect" href="configuration.html#Configuration-ConfigurationConfigurationSymbolNames">production mode</a>.</p>
+
+<p>In addition, as will be described in detail <a shape="rect" href="#JavaScript-BuiltinLibraries">below</a>, Tapestry comes with the <a shape="rect" class="external-link" href="http://www.prototypejs.org/" >Prototype</a> and <a shape="rect" class="external-link" href="http://script.aculo.us/" >Scriptaculous</a> libraries, or you can easily swap in JQuery using a 3rd-party module.</p>
+
+<h1><a shape="rect" name="JavaScript-AddingCustomJavaScript"></a>Adding Custom JavaScript</h1>
+
+<p>When adding your own custom JavaScript or third-party libraries, just follow the strategies below to take advantage of Tapestry's JavaScript support mechanisms.</p>
+
+<p>The recommended practice in Tapestry is to package up any significant amount of JavaScript as a static JavaScript library, a .js file that can be downloaded to the client. Keep your in-page JavaScript code to a minimum, just the few statements needed to initialize objects and reference methods in the JavaScript libraries.</p>
+
+<h2><a shape="rect" name="JavaScript-LinkingtoyourJavaScriptlibraries"></a>Linking to your JavaScript libraries</h2>
+
+<p>Tapestry provides several ways to add a link to a JavaScript library within your page or component. Although you can use direct <tt><script type="text/javascript" src="xxx.js"></script></tt> approach, you should only use it for JavaScript that resides outside of your application. For JavaScript within your app, Tapestry provides <em>much</em> better ways to do the same thing. Most users choose the simplest, the @Import annotation approach.</p>
+
+<div class="navmenu" style="float:right; background:#eee; margin:3px; padding:0 1em"><p><b>JumpStart Demo:</b> <br clear="none">
+<a shape="rect" class="external-link" href="http://jumpstart.doublenegative.com.au/jumpstart/examples/javascript/javascript" >JavaScript</a> </p></div>
+
+<h2><a shape="rect" name="JavaScript-Approach1%3A@Import"></a>Approach 1: @Import</h2>
+
+<p>Use the @<a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/annotations/Import.html">Import</a> annotation (or @<a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/annotations/IncludeJavaScriptLibrary.html">IncludeJavaScriptLibrary</a> in Tapestry 5.0 and 5.1) to include links to JavaScript (and CSS) files in your page or component. Tapestry ensures that each such file is only referenced once in your page.</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+@Import(library={"context:js/jquery.js",
+ "context:js/myeffects.js"})
+public class MyComponent
+{
+ . . .
+}
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.0 and 5.1</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+@IncludeJavaScriptLibrary(value={"context:js/jquery.js",
+ "context:js/myeffects.js"})
+public class MyComponent
+{
+ . . .
+}
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>@Import may also be applied to individual methods, in which case the import operation only occurs when the method is invoked.</p>
+
+<p>Note: When specifying a file to import, you'll often use the <b>context:</b> binding prefix to indicate that the file is stored in the web application context, and not on the classpath. Relative paths will be on the classpath, relative to the Java class. See <a shape="rect" href="component-parameters.html" title="Component Parameters">Component Parameters</a> for other binding prefix options.</p>
+
+<p>Adding the same JavaScript library multiple times does <em>not</em> create duplicate links. The subsequent ones are simply ignored. In this way, each component can add the libraries it needs, without worrying about conflicts with other components.</p>
+
+<h2><a shape="rect" name="JavaScript-Approach2%3AJavaScriptSupport"></a>Approach 2: JavaScriptSupport</h2>
+
+<p>Alternatively, you can use <a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/services/javascript/JavaScriptSupport.html">JavaScriptSupport</a> (for Tapestry 5.2 or later) or <a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/RenderSupport.html">RenderSupport</a> (for Tapestry 5.0 and 5.1) to include a JavaScript library in your page or component. JavaScriptSupport and RenderSupport are <a shape="rect" href="environmental-services.html" title="Environmental Services">environmental services</a> that include a number of methods that will be used by components, or by services that are called from components. For example:</p>
+
+<h3><a shape="rect" name="JavaScript-The%7B%7BimportJavaScriptLibrary%7D%7Dmethod"></a>The <tt>importJavaScriptLibrary</tt> method</h3>
+
+<p>The <tt>importJavaScriptLibrary</tt> method (or <tt>addScriptLink</tt> for Tapestry 5.0 and 5.1) adds a link to a JavaScript library. A component can inject such a script and pass one or more of assets to this method:</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Inject @Path("context:/js/myeffects.js")
+ private Asset myEffects;
+
+ @Environmental
+ private JavaScriptSupport javaScriptSupport;
+
+ void setupRender()
+ {
+ javaScriptSupport.importJavaScriptLibrary(myEffects);
+ }
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Tapestry 5.1 and earlier</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Inject @Path("context:/js/myeffects.js")
+ private Asset myEffects;
+
+ @Environmental
+ private RenderSupport renderSupport;
+
+ void setupRender()
+ {
+ renderSupport.addScriptLink(myEffects);
+ }
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>Tapestry will ensure that the necessary <link> elements are added to the <em>top</em> of the document (in the <head> element). With Tapestry 5.3 and later the new elements are inserted at the bottom of the <head> element; in versions before 5.3 they appear at the top of the <head> element).</p>
+
+<p>As with the annotation approach, adding the same asset multiple times does <em>not</em> create duplicate links.</p>
+
+<p>The <tt>setupRender</tt> method (the name is specifically linked to a <a shape="rect" href="component-rendering.html" title="Component Rendering">render phase</a>) is the correct place to inform the JavaScriptSupport (or RenderSupport) service that the library is needed.</p>
+
+<div class="navmenu" style="float:right; background:#eee; margin:3px; padding:0 1em"><p><b>JumpStart Demo:</b> <br clear="none">
+<a shape="rect" class="external-link" href="http://jumpstart.doublenegative.com.au/jumpstart/examples/javascript/reusable" >Reusable JavaScript</a> </p></div>
+
+<h3><a shape="rect" name="JavaScript-The%7B%7BaddScript%7D%7Dmethod"></a>The <tt>addScript</tt> method</h3>
+
+<p>The <tt>addScript</tt> method is used when you need to add some JavaScript code directly to the page. This will be inserted at the <em>bottom of the document</em>, and will only be executed when the document has finished loading on the client (i.e., from the window.onload event handler).</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+void afterRender()
+{
+ javaScriptSupport.addScript(
+ "$('%s').observe('click', hideMe());",
+ container.getClientId());
+}
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Tapestry 5.1 and earlier</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+void afterRender()
+{
+ javaScriptSupport.addScript(String.format(
+ "$('%s').observe('click', hideMe());",
+ container.getClientId()));
+}
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>When calling the method, the format string can include standard substitutions (such as '%s') for arguments. This saves you the trouble of calling String.format() yourself. (For Tapestry 5.1 and earlier, you must call String.format() yourself.) In any case, the formatted JavaScript is added to the script block in the rendered output.</p>
+
+<h3><a shape="rect" name="JavaScript-InjectingJavaScriptSupport"></a>Injecting JavaScriptSupport</h3>
+
+<p>JavaScriptSupport (like RenderSupport before it) is an <em>environmental</em> object, so you will normally inject it via the @<a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/annotations/Environmental.html">Environmental</a> annotation:</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Environmental
+ private JavaScriptSupport javaScriptSupport;
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.0 and 5.1</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Environmental
+ private RenderSupport renderSupport;
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>The @Environmental annotation only works inside components, but occasionally you may want to inject JavaScriptSupport (or RenderSupport) into a service. Fortunately, a proxy has been set up to allow the use of @Inject instead:</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Inject
+ private JavaScriptSupport javaScriptSupport;
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.0 and 5.1</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Inject
+ private RenderSupport renderSupport;
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>... or, in a service implementation constructor:</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.2 and later</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ public MyServiceImpl(JavaScriptSupport support)
+ {
+ . . .
+ }
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>For Tapestry 5.0 and 5.1</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ public MyServiceImpl(RenderSupport support)
+ {
+ . . .
+ }
+]]></script>
+</div></div></td></tr></tbody></table>
+
+<p>Inside a component, you should use @Environmental, to highlight the fact that RenderSupport (like most environmental objects) is only available during rendering, not during action requests.</p>
+
+<h1><a shape="rect" name="JavaScript-CombiningJavaScriptlibraries"></a>Combining JavaScript libraries</h1>
+
+
+
+<div class="panelMacro"><table class="infoMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="/images/confluence/information.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Added in 5.1.0.2</b><br clear="none"></td></tr></table></div>
+<div style="border-right: 20px solid #D8E4F1;border-left: 20px solid #D8E4F1;"></div>
+<p>In production mode, Tapestry automatically <em>combines</em> JavaScript libraries. A single request (for a <em>virtual asset</em>) will retrieve the combined content of all referenced JavaScript library files.</p>
+
+<p>Note: starting with Tapestry 5.2, JavaScript libraries are only combined if they are part of a JavaScript Stack (see below).</p>
+
+<p>This is a very useful feature, as it reduces the number of requests needed to present a page to the user. It can be disabled, however, by setting the SymbolConstants.COMBINE_SCRIPTS <a shape="rect" href="configuration.html" title="Configuration">configuration symbol</a> to false in your application's module class (normally AppModule.java). By default it is enabled when in production mode and disabled otherwise.</p>
+
+<p>As elsewhere, if the client browser supports gzip compression, the combined JavaScript will be compressed.</p>
+
+<h1><a shape="rect" name="JavaScript-MinifyingJavaScriptlibraries"></a>Minifying JavaScript libraries</h1>
+
+
+
+<div class="panelMacro"><table class="infoMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="/images/confluence/information.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Added in 5.3</b><br clear="none"></td></tr></table></div>
+<div style="border-right: 20px solid #D8E4F1;border-left: 20px solid #D8E4F1;"></div>
+<p>In production mode, Tapestry can automatically <em>minify</em> (intelligently compresses) JavaScript libraries (and CSS) when the application starts up. This can significantly decrease the size of static content that the browser needs to download.</p>
+
+<p>Minification is accomplished using the ResourceMinimizer service. A YUI Compressor-based implementation is available, but this can be overridden.</p>
+
+<p>IMPORTANT NOTE: The tapestry-core module only provides the empty infrastructure for supporting minification; the actual logic is supplied in the tapestry-yuicompressor module. To use it, you'll need to update your dependencies to include this module.</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Maven pom.xml (partial)</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: xml; gutter: false" type="syntaxhighlighter"><![CDATA[
+<dependency>
+ <groupId>org.apache.tapestry</groupId>
+ <artifactId>tapestry-yuicompressor</artifactId>
+ <version>${tapestry-release-version}</version>
+</dependency>
+]]></script>
+</div></div>
+
+<p>Gradle would be similar, of course. If you aren't using something like Maven or Gradle, you'll have to download the jar and its dependency (com.yahoo.platform.yui: yuicompressor) yourself.</p>
+
+<p>Minification can be disabled by setting the SymbolConstants.MINIFICATION_ENABLED <a shape="rect" href="configuration.html" title="Configuration">configuration symbol</a> to false in your application's module class (usually AppModule.java). By default it is enabled when in production mode and disabled otherwise.</p>
+
+<p>Please test your applications well: the YUI Compressor code can be somewhat finicky about the application server and JDK version.</p>
+
+<h1><a shape="rect" name="JavaScript-ClientsideLogging"></a>Client-side Logging</h1>
+
+
+
+<div class="panelMacro"><table class="warningMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="/images/confluence/forbidden.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Deprecated since 5.3</b><br clear="none"></td></tr></table></div>
+<div style="border-right: 20px solid #ffcccc;border-left: 20px solid #ffcccc;"></div>
+
+<p>In versions prior to 5.3, Tapestry uses a modified version of the <a shape="rect" class="external-link" href="http://www.gscottolson.com/blackbirdjs/" >Blackbird</a> JavaScript console. The Tapestry object includes three functions: debug, warn and error.</p>
+
+<p>Each of these functions take a message and an optional pattern; if the pattern is provided, the message is <a shape="rect" class="external-link" href="http://prototypejs.org/api/string/interpolate" >interpolated</a> on the pattern. The final message is displayed in the Blackbird console, which will make itself visible automatically.</p>
+
+<p>In production mode, debug messages will be filtered out (they will not be visible until the user presses F2 to display the console, and then clicks the grayed out icon for debug messages). In development mode, debug messages are not filtered out.</p>
+
+<p>Example usage:</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ Tapestry.debug("Field id is #{id}, value is #{value}", field);
+
+ Tapestry.error("Server is not available.");
+
+]]></script>
+</div></div>
+
+<p>With Tapestry 5.3 and later the Blackbird console has been removed; just use the standard console logging features (e.g. <tt>console.log()</tt>) built into modern browsers.</p>
+
+<h1><a shape="rect" name="JavaScript-HandlingSlowPageLoads"></a>Handling Slow Page Loads</h1>
+
+<p>If your page loads slowly (typically, because of scripts loaded from external sites), you may see a race condition where the user can click on a link before an event handler for that link has been wired up.</p>
+
+<p>The client-side function <tt>Tapestry.waitForPage()</tt> can be used in an element's onclick handler to force a wait for the page to fully load. In this race condition, the screen will dim and a message will appear advising the user to wait a moment; once the page is fully loaded, this modal dialog will be removed.</p>
+
+<p>The correct usage is:</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ <a href="..." onclick="javascript:Tapestry.waitForPage(event);"> ... </a>
+]]></script>
+</div></div>
+
+<p>The constant <a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/MarkupConstants.html">MarkupConstants.WAIT_FOR_PAGE</a> contains the part of this snippet inside the quotes.</p>
+
+<h1><a shape="rect" name="JavaScript-TheStandardTapestryLibrary"></a>The Standard Tapestry Library</h1>
+
+<p>Tapestry's client-side support, the standard Tapestry library, consists of <tt>tapestry.js</tt>, which has dependencies on Prototype and on Scriptaculous Effects. tapestry.js, along with its dependencies. The tapestry.js library is automatically added to the page when your code adds any other JavaScript or JavaScript library.</p>
+
+<h2><a shape="rect" name="JavaScript-TapestryNamespace"></a>Tapestry Namespace</h2>
+
+<p>Tapestry defines a number of object and classes inside the Tapestry namespace.</p>
+
+<p>It also adds a handful of methods to the Form class, and to Form elements. These are mostly related to input validation and determining element visibility.</p>
+
+<h2><a shape="rect" name="JavaScript-TheTapestryObject%24T%28%29"></a>The Tapestry Object $T()</h2>
+
+
+
+<div class="panelMacro"><table class="warningMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="/images/confluence/forbidden.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Deprecated since 5.2 (no replacement)</b><br clear="none"></td></tr></table></div>
+<div style="border-right: 20px solid #ffcccc;border-left: 20px solid #ffcccc;"></div>
+
+<p>The standard library adds a new function, <tt>$T()</tt>. This function is used much like Prototype's <tt>$()</tt>, except that instead of returning a DOM object, it returns a hash (an initially empty JavaScript object) that is associated with the DOM object. This hash is known as <em>the Tapestry object</em>.</p>
+
+<p>You may pass in an object id (as a string) or an object reference. The Tapestry Object is created on first invocation. Note: you'll see it as a property name _tapestry on the DOM object (which may be useful when debugging).</p>
+
+<p>When Tapestry adds information to a DOM object, it does so in the Tapestry object. This helps avoid name conflicts, and groups all Tapestry-added properties into one place which is much easier to debug.</p>
+
+<p>For example, you might store a value for an element in one place:</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ $T(myid).fadeDuration = .5;
+]]></script>
+</div></div>
+
+<p>Then use it somewhere else:</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ new Effect.Fade($(myId), { duration: $T(myid).fadeDuration });
+]]></script>
+</div></div>
+
+
+<h1><a shape="rect" name="JavaScript-AjaxComponentsandMixins"></a>Ajax Components and Mixins</h1>
+
+<p>Tapestry provides easy-to-use support for <em>Ajax</em>, the technique of using JavaScript to dynamically updating parts of a web page with content from the server without redrawing the whole page. See <a shape="rect" href="ajax-and-zones.html" title="Ajax and Zones">Ajax and Zones</a> for details.</p>
+
+<h1><a shape="rect" name="JavaScript-BuiltinLibraries"></a>Built-in Libraries</h1>
+
+<div class="navmenu" style="float:right; width:30%; background:#eee; margin:3px; padding:3px"><p><font color="green"><b>Alternatives to Prototype</b></font><br clear="none">
+Tapestry also works well with other JavaScript libraries, such as JQuery and ExtJS:</p>
+<ul><li><b><a shape="rect" class="external-link" href="https://github.com/got5/tapestry5-jquery" >Tapestry5-Jquery module</a></b> – Using JQuery <em>instead of</em> Prototype</li><li><a shape="rect" class="external-link" href="http://wiki.apache.org/tapestry/Tapestry5HowToIntegrateJQuery">Tapestry5HowToIntegrateJQuery</a> – Using JQuery <em>in addition to</em> Prototype</li><li><a shape="rect" class="external-link" href="https://issues.apache.org/jira/browse/TAP5-999">TAP5-999</a> tracks work underway to introduce an agnostic tapestry.js layer to allow switching from Prototype to JQuery. See <a shape="rect" href="javascript-rewrite.html" title="JavaScript Rewrite">JavaScript Rewrite</a> for more info.</li><li><a shape="rect" class="external-link" href="https://issues.apache.org/jira/browse/TAP5-1364">TAPS-1364</a> lists some starting points for ExtJS integration</li></ul>
+</div>
+
+<p>Tapestry comes with the <a shape="rect" class="external-link" href="http://www.prototypejs.org/" >Prototype</a> and <a shape="rect" class="external-link" href="http://script.aculo.us/" >Scriptaculous</a> libraries ... no extra download is required. Tapestry will automatically link into your pages the prototype.js, scriptaculous.js, and effects.js libraries, as well as the Tapestry library, tapestry.js (which largely consists of support for form input validation). Starting with Tapestry 5.3, <a shape="rect" class="external-link" href="http://documentcloud.github.com/underscore/" >Underscore</a> is also included.</p>
+
+<h2><a shape="rect" name="JavaScript-PrototypeandScriptaculousVersions"></a>Prototype and Scriptaculous Versions</h2>
+
+<div class="table-wrap">
+<table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.3.5 </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.7.1 </td><td colspan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.9 </td><td colspan="1" rowspan="1" class="confluenceTd"> Underscore 1.1.7 </td></tr><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.3+ </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.7 </td><td colspan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.9 </td><td colspan="1" rowspan="1" class="confluenceTd"> Underscore 1.1.7 </td></tr><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.2.6 </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.7 </td><td colspan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.9 </td></tr><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.2 </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.6.1 </td><td cols
pan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.8.2 </td></tr><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.1 </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.6.0.3 </td><td colspan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.8.2 </td></tr><tr><th colspan="1" rowspan="1" class="confluenceTh"> Tapestry 5.0 </th><td colspan="1" rowspan="1" class="confluenceTd"> Prototype 1.6.0 </td><td colspan="1" rowspan="1" class="confluenceTd"> Scriptaculous 1.8.0 </td></tr></tbody></table>
+</div>
+
+
+<p>Tapestry uses a modified version of the main Scriptaculous library, scriptaculous.js, with the library's default <a shape="rect" class="external-link" href="http://wiki.script.aculo.us/scriptaculous/show/Usage" >autoloading</a> behavior turned off. This lets Tapestry and Tapestry components control which Scriptaculus scripts are loaded, rather than having <em>all</em> of them loaded unnecessarily.</p>
+
+<p>If you need access to other Scriptaculous libraries, you can provide them as follows:</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Inject @Path("${tapestry.scriptaculous}/dragdrop.js")
+ private Asset dragDropLibrary;
+
+ @Environmental
+ private JavaScriptSupport javaScriptSupport;
+
+ void setupRender()
+ {
+ javaScriptSupport.addScriptLink(dragDropLibrary);
+ }
+
+]]></script>
+</div></div>
+
+<p>The Asset is injected, using the ${tapestry.scriptaculous} <a shape="rect" href="symbols.html" title="Symbols">symbol</a> to reference the location of the Scriptaculous library.</p>
+
+<p>Even though the dragdrop.js library is stored inside a JAR file, Tapestry ensures that it can be accessed from the client web browser. A Tapestry URL within the virtual folder "/assets" is created; the file will be given a version number (the application version number if not specified more specifically) and will be sent to the browser with a far-future expires header (to encourage the browser to cache the file aggressively).</p>
+
+<h1><a shape="rect" name="JavaScript-JavaScriptStacks"></a>JavaScript Stacks</h1>
+
+
+<div class="panelMacro"><table class="infoMacro"><colgroup span="1"><col span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1" valign="top"><img align="middle" src="/images/confluence/information.gif" width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Added in 5.2</b><br clear="none"></td></tr></table></div>
+<div style="border-right: 20px solid #D8E4F1;border-left: 20px solid #D8E4F1;"></div>
+
+<p>Tapestry allows you to define groups of related JavaScript libraries and stylesheets as "stacks". The built-in "core" stack is used to define the core JavaScript libraries needed by Tapestry (currently, this includes Prototype and Scriptaculous, as well as Tapestry-specific libraries). Other component libraries may define additional stacks for related sets of resources, for example, to bundle together some portion of the ExtJS or YUI libraries.</p>
+
+<p>A <a shape="rect" class="external-link" href="http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/services/javascript/JavaScriptStack.html">JavaScriptStack</a> can be thought of as a generalization of Tapestry 5.1's ClientInfrastructure, which exists now to define the "core" JavaScript stack.</p>
+
+<p>JavaScript assets of a stack may (when enabled) be exposed to the client as a single URL (identifying the stack by name). The individual assets are combined into a single virtual asset, which is then streamed to the client.</p>
+
+
+<p>To group several static resources together in a single stack, you must create a new implementation of the JavaScriptStack interface . This interface has four methods:</p>
+
+<ul class="alternate" type="square"><li><b>getStylesheets</b> : This method will return a list of stylesheet files (StylesheetLink-type object) associated to this stack</li></ul>
+
+
+<ul class="alternate" type="square"><li><b>getJavaScriptLibraries</b> : This method will return a list of javascript files (Asset-type object) associated to this stack</li></ul>
+
+
+<ul class="alternate" type="square"><li><b>getStacks</b> : It is also possible to make a stack dependant of other stacks. All the stacks defined in this method will be loaded before the current stack.</li></ul>
+
+
+<ul class="alternate" type="square"><li><b>getInitialization</b> : this method makes it possible to call a JavaScript initialization for the stack. Tapestry will automatically add this initialization to the page that imports the stacks.</li></ul>
+
+
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>myStack.java</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+public class myStack implements JavaScriptStack {
+
+ private final AssetSource assetSource;
+
+ public myStack (final AssetSource assetSource)
+ {
+ this.assetSource = assetSource;
+ }
+
+ public String getInitialization()
+ {
+ return null;
+ }
+
+
+
+ public List<Asset> getJavaScriptLibraries()
+ {
+ List<Asset> ret = new ArrayList<Asset>();
+
+ ret.add(assetSource.getContextAsset("static/js/jquery.js", null));
+
+ ret.add(assetSource.getContextAsset("static/js/jquery.ui.core.js", null));
+
+ return ret;
+ }
+
+ public List<StylesheetLink> getStylesheets()
+ {
+ List<StylesheetLink> ret = new ArrayList<StylesheetLink>();
+
+ ret.add(new StylesheetLink(assetSource.getContextAsset("static/css/style.css", null)));
+
+ return ret;
+ }
+
+ public List<String> getStacks()
+ {
+ return Collections.emptyList();
+ }
+
+}
+]]></script>
+</div></div>
+
+<p>When your new Stack is created, you have to define it in your AppModule.</p>
+
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>AppModule.java</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+@Contribute(JavaScriptStackSource.class)
+public static void addMyStack (MappedConfiguration<String, JavaScriptStack> configuration)
+{
+ configuration.addInstance("MyNewStack", myStack.class);
+}
+]]></script>
+</div></div>
+
+<p>You can now use it in your pages and components, by using the @Import annotation or the JavaScriptSupport service :</p>
+
+<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>With @Import</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+ @Import(stack="MyNewStack")
+ public class myPage {
+ }
+]]></script>
+</div></div></td><td colspan="1" rowspan="1" valign="top" class="confluenceTd">
+<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>With JavaScriptSupport</b></div><div class="codeContent panelContent">
+<script class="theme: Default; brush: java; gutter: false" type="syntaxhighlighter"><![CDATA[
+@Inject
+private JavaScriptSupport js;
+
+@SetupRender
+public void importStack(){
+ js.importStack("MyNewStack");
+}
+]]></script>
+</div></div></td></tr></tbody></table></div>
+</div>
+
+<div class="clearer"></div>
+<div id="footer">
+<div id="footer"><p>Apache Tapestry, Tapestry, Apache, the Apache feather logo, and the Apache Tapestry project logo are trademarks of The Apache Software Foundation.<br clear="none">
+<script type="text/javascript">
+ var _gaq = _gaq || [];
+ _gaq.push(['_setAccount', 'UA-400821-1']);
+ _gaq.push(['_trackPageview']);
+
+ (function() {
+ var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
+ ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+ var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+ })();
+</script></p></div>
+</div>
+ <div id="comments_thread"></div>
+ <script type="text/javascript" src="https://comments.apache.org/show_comments.lua?site=tapestry&page=http://tapestry.apache.org/javascript.html" async="true">
+ </script>
+ <noscript>
+ <iframe width="100%" height="500" src="https://comments.apache.org/iframe.lua?site=tapestry&page=http://tapestry.apache.org/javascript.html"></iframe>
+ </noscript>
+ </div>
+</body>
+</html>