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| <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/tag-developers/ajax-event-system.md" title="Edit this page on GitHub">Edit on GitHub</a> |
| |
| <h1 id="ajax-event-system">ajax event system</h1> |
| |
| <blockquote> |
| <p>NOTE: Ajax template (Dojo plugin) is deprecated and won’t be supported any longer.</p> |
| </blockquote> |
| |
| <p>As you may have seen with the <a href="ajax-div-template.html">ajax div template</a> and <a href="ajax-a-template.html">ajax a template</a>, |
| the framework and Dojo provide a nice way to subscribe and notify of topics from within the browser. A benefit of using |
| Dojo as the basis of many of these components is being able to loosely couple UI components. There are two |
| attributes of importance: <code class="highlighter-rouge">listenTopics</code> and <code class="highlighter-rouge">notifyTopics</code>.</p> |
| |
| <ul> |
| <li>If a component has a <code class="highlighter-rouge">notifyTopics</code> attribute, then after the processing has been completed a message with be published |
| to the topic names supplied as a value (comma delimited).</li> |
| <li>If a component has a <code class="highlighter-rouge">listenTopics</code> attribute, then when a message is published to the topic names supplied as a value |
| (comma delimited), the component will perform custom tag-specific logic ( i.e a DIV tag will re-fresh its content).</li> |
| </ul> |
| |
| <p>As well as this, you can publish and subscribe to topic names with javascript code. To publish to the <code class="highlighter-rouge">topic_name</code> topic:</p> |
| |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">dojo</span><span class="o">.</span><span class="na">event</span><span class="o">.</span><span class="na">topic</span><span class="o">.</span><span class="na">publish</span><span class="o">(</span><span class="s">"topic_name"</span><span class="o">,</span> <span class="s">"content"</span><span class="o">);</span> |
| </code></pre></div></div> |
| |
| <p>The <code class="highlighter-rouge">topic_name</code> attribute is required, the content attribute is not and most elements are triggered without having this |
| attribute. See the <a href="ajax-div-template.html">ajax div template</a> for an example of this type of interaction.</p> |
| |
| <p>To subscribe to the <code class="highlighter-rouge">topic_name</code> topic:</p> |
| |
| <div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">function</span> <span class="nx">doSomethingWithEvent</span><span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">{</span> |
| <span class="p">...</span> |
| <span class="p">}</span> |
| |
| <span class="nx">dojo</span><span class="p">.</span><span class="nx">event</span><span class="p">.</span><span class="nx">topic</span><span class="p">.</span><span class="nx">getTopic</span><span class="p">(</span><span class="s2">"topic_name"</span><span class="p">).</span><span class="nx">subscribe</span><span class="p">(</span><span class="kc">null</span><span class="p">,</span> <span class="s2">"doSomethingWithEvent"</span><span class="p">);</span> |
| </code></pre></div></div> |
| |
| <p>The <code class="highlighter-rouge">subscribe</code> method takes 2 parameters, the first is the JavaScript object variable (or null if the function is not |
| from an object) and the second is the name of the function to call when an event is received on the topic.</p> |
| |
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