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---
title: NodeFilter
slug: Web/API/NodeFilter
tags:
- API
- DOM
- Reference
translation_of: Web/API/NodeFilter
---
<div>{{APIRef("DOM")}}</div>
<p><span class="seoSummary"><code><strong>NodeFilter</strong></code> 인터페이스는 {{ domxref("NodeIterator") }}나 {{ domxref("TreeWalker") }}에서 노드를 거를 때 사용하는 객체를 나타냅니다.</span> <code>NodeFilter</code>는 DOM이나 노드 순회 방법은 알지 못하며, 주어진 필터에 대해 단일 노드를 평가하는 방법만 알 수 있습니다.</p>
<div class="note">
<p>The browser doesn't provide any object implementing this interface. It is the user who is expected to write one, tailoring the <code>acceptNode()</code> method to its needs, and using it with some {{domxref("TreeWalker")}} or {{domxref("NodeIterator")}} objects.</p>
</div>
<h2 id="Properties">Properties</h2>
<p><em>This interface neither implements, nor inherits, any properties.</em></p>
<h2 id="Methods">Methods</h2>
<p><em>This interface doesn't inherit any methods.</em></p>
<dl>
<dt>{{domxref("NodeFilter.acceptNode()")}}</dt>
<dd>Returns an <code>unsigned short</code> that will be used to tell if a given {{domxref("Node")}} must be accepted or not by the {{ domxref("NodeIterator") }} or {{ domxref("TreeWalker") }} iteration algorithm. This method is expected to be written by the user of a <code>NodeFilter</code>. Possible return values are:
<table class="standard-table">
<tbody>
<tr>
<td class="header">Constant</td>
<td class="header">Description</td>
</tr>
<tr>
<td><code>FILTER_ACCEPT</code></td>
<td>Value returned by the {{ domxref("NodeFilter.acceptNode()") }} method when a node should be accepted.</td>
</tr>
<tr>
<td><code>FILTER_REJECT</code></td>
<td>Value to be returned by the {{ domxref("NodeFilter.acceptNode()") }} method when a node should be rejected. For {{ domxref("TreeWalker") }}, child nodes are also rejected. For {{ domxref("NodeIterator") }}, this flag is synonymous with FILTER_SKIP.</td>
</tr>
<tr>
<td><code>FILTER_SKIP</code></td>
<td>Value to be returned by {{ domxref("NodeFilter.acceptNode()") }} for nodes to be skipped by the {{ domxref("NodeIterator") }} or {{ domxref("TreeWalker") }} object. The children of skipped nodes are still considered. This is treated as "skip this node but not its children".</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<h2 id="Example">Example</h2>
<pre class="brush: js">var nodeIterator = document.createNodeIterator(
// Node to use as root
document.getElementById('someId'),
// Only consider nodes that are text nodes (nodeType 3)
NodeFilter.SHOW_TEXT,
// Object containing the function to use for the acceptNode method
// of the NodeFilter
{ acceptNode: function(node) {
// Logic to determine whether to accept, reject or skip node
// In this case, only accept nodes that have content
// other than whitespace
if ( ! /^\s*$/.test(node.data) ) {
return NodeFilter.FILTER_ACCEPT;
}
}
},
false
);
// Show the content of every non-empty text node that is a child of root
var node;
while ((node = nodeIterator.nextNode())) {
alert(node.data);
}
</pre>
<h2 id="Specification" name="Specification">Specifications</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('DOM WHATWG', '#interface-nodefilter', 'NodeFilter')}}</td>
<td>{{Spec2('DOM WHATWG')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('DOM2 Traversal_Range', 'traversal.html#Traversal-NodeFilter', 'NodeFilter')}}</td>
<td>{{Spec2('DOM2 Traversal_Range')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{Compat("api.NodeFilter")}}</p>
<h2 id="See_also">See also</h2>
<ul>
<li>Related interfaces: {{domxref("TreeWalker")}}, {{domxref("NodeIterator")}}.</li>
</ul>
|
