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| <article class="container"> |
| <section class="col-md-12"> |
| <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/tag-developers/action-tag.md" title="Edit this page on GitHub">Edit on GitHub</a> |
| |
| <a href="tag-reference.html" title="back to Tag Reference"><< back to Tag Reference</a> |
| |
| <h1 id="action">action</h1> |
| |
| <p>Please make sure you have read the <a href="tag-syntax">Tag Syntax</a> document and understand how tag attribute syntax works.</p> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Execute an action from within a view</p> |
| |
| <p>Parameters can be passed to the action using nested <a href="param-tag">param</a> tags.</p> |
| |
| <h2 id="placement-in-context">Placement in context</h2> |
| |
| <p>The action will not be published to the context until the whole tag is evaluated, meaning that inside the body of the tag, |
| the action cannot be accessed, For example:</p> |
| |
| <pre><code class="language-jsp"><s:action var="myAction" name="MyAction" namespace="/"> |
| Is "myAction" null inside the tag? <s:property value="#myAction == null" /> |
| </s:action> |
| Is "myAction" null outside the tag? <s:property value="#myAction == null" /> |
| </code></pre> |
| |
| <p>Will print:</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>Is "myAction" null inside the tag? true |
| |
| Is "myAction" null outside the tag? false |
| </code></pre></div></div> |
| |
| <p>Execute an action from within a view</p> |
| |
| <h2 id="attributes">Attributes</h2> |
| |
| <table width="100%"> |
| <tr> |
| <td colspan="6"><h4>Dynamic Attributes Allowed:</h4> false</td> |
| </tr> |
| <tr> |
| <td colspan="6"> </td> |
| </tr> |
| <tr> |
| <th align="left" valign="top"><h4>Name</h4></th> |
| <th align="left" valign="top"><h4>Required</h4></th> |
| <th align="left" valign="top"><h4>Default</h4></th> |
| <th align="left" valign="top"><h4>Evaluated</h4></th> |
| <th align="left" valign="top"><h4>Type</h4></th> |
| <th align="left" valign="top"><h4>Description</h4></th> |
| </tr> |
| <tr> |
| <td align="left" valign="top">executeResult</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">Boolean</td> |
| <td align="left" valign="top">Whether the result of this action (probably a view) should be executed/rendered</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">flush</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">true</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">Boolean</td> |
| <td align="left" valign="top">Whether the writer should be flush upon end of action component tag, default to true</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">ignoreContextParams</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">Boolean</td> |
| <td align="left" valign="top">Whether the request parameters are to be included when the action is invoked</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">name</td> |
| <td align="left" valign="top"><strong>true</strong></td> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">String</td> |
| <td align="left" valign="top">Name of the action to be executed (without the extension suffix eg. .action)</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">namespace</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">namespace from where tag is used</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">String</td> |
| <td align="left" valign="top">Namespace for action to call</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">rethrowException</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">Boolean</td> |
| <td align="left" valign="top">Whether an exception should be rethrown, if the target action throws an exception</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">var</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">String</td> |
| <td align="left" valign="top">Name used to reference the value pushed into the Value Stack (scope: action).</td> |
| </tr> |
| </table> |
| |
| <h2 id="examples">Examples</h2> |
| |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">public</span> <span class="kd">class</span> <span class="nc">ActionTagAction</span> <span class="kd">extends</span> <span class="n">ActionSupport</span> <span class="o">{</span> |
| |
| <span class="kd">public</span> <span class="n">String</span> <span class="nf">execute</span><span class="o">()</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="s">"done"</span><span class="o">;</span> |
| <span class="o">}</span> |
| |
| <span class="kd">public</span> <span class="n">String</span> <span class="nf">doDefault</span><span class="o">()</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span> |
| <span class="n">ServletActionContext</span><span class="o">.</span><span class="na">getRequest</span><span class="o">().</span><span class="na">setAttribute</span><span class="o">(</span><span class="s">"stringByAction"</span><span class="o">,</span> <span class="s">"This is a String put in by the action's doDefault()"</span><span class="o">);</span> |
| <span class="k">return</span> <span class="s">"done"</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| |
| </code></pre></div></div> |
| |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nt"><struts></span> |
| .... |
| <span class="nt"><action</span> <span class="na">name=</span><span class="s">"actionTagAction1"</span> <span class="na">class=</span><span class="s">"tmjee.testing.ActionTagAction"</span><span class="nt">></span> |
| <span class="nt"><result</span> <span class="na">name=</span><span class="s">"done"</span><span class="nt">></span>success.jsp<span class="nt"></result></span> |
| <span class="nt"></action></span> |
| <span class="nt"><action</span> <span class="na">name=</span><span class="s">"actionTagAction2"</span> <span class="na">class=</span><span class="s">"tmjee.testing.ActionTagAction"</span> <span class="na">method=</span><span class="s">"default"</span><span class="nt">></span> |
| <span class="nt"><result</span> <span class="na">name=</span><span class="s">"done"</span><span class="nt">></span>success.jsp<span class="nt"></result></span> |
| <span class="nt"></action></span> |
| .... |
| <span class="nt"></struts></span> |
| </code></pre></div></div> |
| |
| <p>The following action tag will execute result and include it in this page</p> |
| |
| <pre><code class="language-jsp"> <s:action name="actionTagAction" executeResult="true" /> |
| </code></pre> |
| |
| <p>The following action tag will do the same as above, but invokes method specialMethod in action</span></p> |
| |
| <pre><code class="language-jsp"> <s:action name="actionTagAction!specialMethod" executeResult="true" /> |
| </code></pre> |
| |
| <p>The following action tag will not execute result, but put a String in request scope under an id <code class="highlighter-rouge">stringByAction</code> which |
| will be retrieved using property tag</span></p> |
| |
| <pre><code class="language-jsp"> <s:action name="actionTagAction!default" executeResult="false" /> |
| <s:property value="#attr.stringByAction" /> |
| </code></pre> |
| |
| </section> |
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