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     <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/visitor-validator.md" title="Edit this page on GitHub">Edit on GitHub</a>

     <a href="validation.html" title="back to Validation"><< back to Validation</a>

     <h1 class="no_toc" id="visitor-validator">visitor validator</h1>

 <ul id="markdown-toc">
   <li><a href="#description" id="markdown-toc-description">Description</a></li>
   <li><a href="#parameters" id="markdown-toc-parameters">Parameters</a></li>
   <li><a href="#examples" id="markdown-toc-examples">Examples</a></li>
 </ul>

 <h2 id="description">Description</h2>

 <p>The VisitorFieldValidator allows you to forward validation to object properties of your action using the object’s own
 validation files. This allows you to use the <code class="highlighter-rouge">ModelDriven</code> development pattern and manage your validations for your models
 in one place, where they belong, next to your model classes. The VisitorFieldValidator can handle either simple Object
 properties, Collections of Objects, or Arrays.</p>

 <h2 id="parameters">Parameters</h2>

 <ul>
   <li><code class="highlighter-rouge">fieldName</code> - field name if plain-validator syntax is used, not needed if field-validator syntax is used.</li>
   <li><code class="highlighter-rouge">context</code> - the context of which validation should take place. Optional.</li>
   <li><code class="highlighter-rouge">appendPrefix</code> - the prefix to be added to field. Optional.</li>
 </ul>

 <h2 id="examples">Examples</h2>

 <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;validators&gt;</span>
     <span class="c">&lt;!-- Plain Validator Syntax --&gt;</span>
     <span class="nt">&lt;validator</span> <span class="na">type=</span><span class="s">"visitor"</span><span class="nt">&gt;</span>
         <span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"fieldName"</span><span class="nt">&gt;</span>user<span class="nt">&lt;/param&gt;</span>
         <span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"context"</span><span class="nt">&gt;</span>myContext<span class="nt">&lt;/param&gt;</span>
         <span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"appendPrefix"</span><span class="nt">&gt;</span>true<span class="nt">&lt;/param&gt;</span>
     <span class="nt">&lt;/validator&gt;</span>

     <span class="c">&lt;!-- Field Validator Syntax --&gt;</span>
     <span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"user"</span><span class="nt">&gt;</span>
        <span class="nt">&lt;field-validator</span> <span class="na">type=</span><span class="s">"visitor"</span><span class="nt">&gt;</span>
           <span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"context"</span><span class="nt">&gt;</span>myContext<span class="nt">&lt;/param&gt;</span>
           <span class="nt">&lt;param</span> <span class="na">name=</span><span class="s">"appendPrefix"</span><span class="nt">&gt;</span>true<span class="nt">&lt;/param&gt;</span>
        <span class="nt">&lt;/field-validator&gt;</span>
     <span class="nt">&lt;/field&gt;</span>
 <span class="nt">&lt;/validators&gt;</span>
 </code></pre></div></div>

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	<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/visitor-validator.md" title="Edit this page on GitHub">Edit on GitHub</a>

	<a href="validation.html" title="back to Validation"><< back to Validation</a>

	<h1 class="no_toc" id="visitor-validator">visitor validator</h1>

	<ul id="markdown-toc">
	<li><a href="#description" id="markdown-toc-description">Description</a></li>
	<li><a href="#parameters" id="markdown-toc-parameters">Parameters</a></li>
	<li><a href="#examples" id="markdown-toc-examples">Examples</a></li>
	</ul>

	<h2 id="description">Description</h2>

	<p>The VisitorFieldValidator allows you to forward validation to object properties of your action using the object’s own
	validation files. This allows you to use the <code class="highlighter-rouge">ModelDriven</code> development pattern and manage your validations for your models
	in one place, where they belong, next to your model classes. The VisitorFieldValidator can handle either simple Object
	properties, Collections of Objects, or Arrays.</p>

	<h2 id="parameters">Parameters</h2>

	<ul>
	<li><code class="highlighter-rouge">fieldName</code> - field name if plain-validator syntax is used, not needed if field-validator syntax is used.</li>
	<li><code class="highlighter-rouge">context</code> - the context of which validation should take place. Optional.</li>
	<li><code class="highlighter-rouge">appendPrefix</code> - the prefix to be added to field. Optional.</li>
	</ul>

	<h2 id="examples">Examples</h2>

	<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><validators></span>
	<span class="c"><!-- Plain Validator Syntax --></span>
	<span class="nt"><validator</span> <span class="na">type=</span><span class="s">"visitor"</span><span class="nt">></span>
	<span class="nt"><param</span> <span class="na">name=</span><span class="s">"fieldName"</span><span class="nt">></span>user<span class="nt"></param></span>
	<span class="nt"><param</span> <span class="na">name=</span><span class="s">"context"</span><span class="nt">></span>myContext<span class="nt"></param></span>
	<span class="nt"><param</span> <span class="na">name=</span><span class="s">"appendPrefix"</span><span class="nt">></span>true<span class="nt"></param></span>
	<span class="nt"></validator></span>

	<span class="c"><!-- Field Validator Syntax --></span>
	<span class="nt"><field</span> <span class="na">name=</span><span class="s">"user"</span><span class="nt">></span>
	<span class="nt"><field-validator</span> <span class="na">type=</span><span class="s">"visitor"</span><span class="nt">></span>
	<span class="nt"><param</span> <span class="na">name=</span><span class="s">"context"</span><span class="nt">></span>myContext<span class="nt"></param></span>
	<span class="nt"><param</span> <span class="na">name=</span><span class="s">"appendPrefix"</span><span class="nt">></span>true<span class="nt"></param></span>
	<span class="nt"></field-validator></span>
	<span class="nt"></field></span>
	<span class="nt"></validators></span>
	</code></pre></div></div>

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