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<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/field-expression-validator-annotation.md" title="Edit this page on GitHub">Edit on GitHub</a>
<a href="annotations.html" title="back to Annotations"><< back to Annotations</a>
<h1 id="fieldexpressionvalidator-annotation">FieldExpressionValidator Annotation</h1>
<p>This validator uses an OGNL expression to perform its validator. The error message will be added to the field if the expression
returns false when it is evaluated against the value stack.</p>
<h2 id="usage">Usage</h2>
<p>The annotation must be applied at method level.</p>
<h2 id="parameters">Parameters</h2>
<p> <table class="confluenceTable" summary="">
<tr>
<th class="confluenceTh"> Parameter </th>
<th class="confluenceTh"> Required </th>
<th class="confluenceTh"> Default </th>
<th class="confluenceTh"> Notes </th>
</tr>
<tr>
<td class="confluenceTd">message</td>
<td class="confluenceTd">yes</td>
<td class="confluenceTd">&nbsp;</td>
<td class="confluenceTd">field error message</td>
</tr>
<tr>
<td class="confluenceTd">key</td>
<td class="confluenceTd">no</td>
<td class="confluenceTd">&nbsp;</td>
<td class="confluenceTd">i18n key from language specific properties file.</td>
</tr>
<tr>
<td class="confluenceTd">messageParams</td>
<td class="confluenceTd">no</td>
<td class="confluenceTd">&nbsp;</td>
<td class="confluenceTd">Additional params to be used to customize message - will be evaluated against the Value Stack</td>
</tr>
<tr>
<td class="confluenceTd">fieldName</td>
<td class="confluenceTd">no</td>
<td class="confluenceTd">&nbsp;</td>
<td class="confluenceTd">&nbsp;</td>
</tr>
<tr>
<td class="confluenceTd">shortCircuit</td>
<td class="confluenceTd">no</td>
<td class="confluenceTd">false</td>
<td class="confluenceTd">If this validator should be used as shortCircuit.</td>
</tr>
<tr>
<td class="confluenceTd"> expression </td>
<td class="confluenceTd"> yes </td>
<td class="confluenceTd">&nbsp;</td>
<td class="confluenceTd"> An OGNL expression that returns a boolean value. </td>
</tr>
</table>
</p>
<h2 id="examples">Examples</h2>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nd">@FieldExpressionValidator</span><span class="o">(</span><span class="n">message</span> <span class="o">=</span> <span class="s">"Default message"</span><span class="o">,</span> <span class="n">key</span> <span class="o">=</span> <span class="s">"i18n.key"</span><span class="o">,</span> <span class="n">shortCircuit</span> <span class="o">=</span> <span class="kc">true</span><span class="o">,</span> <span class="n">expression</span> <span class="o">=</span> <span class="s">"an OGNL expression"</span><span class="o">)</span>
</code></pre></div></div>
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