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---
title: Node.insertBefore()
slug: Web/API/Node/insertBefore
translation_of: Web/API/Node/insertBefore
---
<div>
<div>Mojtaba iranpour {{APIRef("DOM")}}</div>
</div>
<p>The <code><strong>Node.insertBefore()</strong></code> method inserts the specified node before a reference node as a child of the current node.</p>
<h2 id="Syntax" name="Syntax">Syntax</h2>
<pre class="syntaxbox">var <em>insertedNode</em> = <em>parentNode</em>.insertBefore(<em>newNode</em>, <em>referenceNode</em>);
</pre>
<p>In Mozilla Firefox, if <code><var>referenceNode</var></code> is <code>null</code><span style="font-size: 14px; line-height: 1.5;">, </span><code><var>newNode</var></code><span style="font-size: 14px; line-height: 1.5;"> is inserted at the end of the list of child nodes. If the <code><em>referenceNode </em></code>is of <em><code>[ Type ]</code> "<code><em>undefined"</em> </code></em>( this kind of argument is <code>String</code> ) will be throw, in all of the browser ( IE, Chrome and Mozilla ) a "Type Error: Invalid Argument" since the the function </span><code>insertBefore </code>accept as second argument a<em><code> [ Type ] Node.</code></em></p>
<h2 id="Example_2">Example</h2>
<pre class="brush: html"><div id="parentElement">
<span id="childElement">foo bar</span>
</div>
<script>
//Create the new node to insert
var newNode = document.createElement("span");
//Get a reference to the parent node
var parentDiv = document.getElementById("parentElement").parentNode;
//Begin test case [ 1 ] : Exist a childElement --> All working correctly
var sp2 = document.getElementById("childElement");
parentDiv.insertBefore(newNode,sp2);
//End test case [ 1 ]
//Begin test case [ 2 ] : childElement is of Type undefined
var sp2 = undefined; //Not exist a node of id "childElement"
parentDiv.insertBefore(newNode,sp2); //implicit dynamic cast to type Node
//End test case [ 2 ]
//Begin test case [ 3 ] : childElement is of Type "undefined" ( string )
var sp2 = "undefined"; //Not exist a node of id "childElement"
parentDiv.insertBefore(newNode,sp2); //Generate "Type Error: Invalid Argument"
//End test case [ 3 ]
</pre>
<ul>
<li><code>insertedNode</code> The node being inserted, that is <code>newNode</code></li>
<li><code>parentNode</code> The parent of the newly inserted node.</li>
<li><code>newNode</code> The node to insert.</li>
<li><code>referenceNode</code> The node before which <code>newNode</code> is inserted.</li>
</ul>
<h2 id="Example" name="Example">Example</h2>
<pre class="brush:html"><div id="parentElement">
<span id="childElement">foo bar</span>
</div>
<script>
// Create a new, plain <span> element
var sp1 = document.createElement("span");
// Get a reference to the element, before we want to insert the element
var sp2 = document.getElementById("childElement");
// Get a reference to the parent element
var parentDiv = sp2.parentNode;
// Insert the new element into the DOM before sp2
parentDiv.insertBefore(sp1, sp2);
</script>
</pre>
<p>There is no <code>insertAfter</code> method. It can be emulated by combining the <code>insertBefore</code> method with <code><a href="/en-US/docs/DOM/Node.nextSibling" title="DOM/Node.nextSibling">nextSibling</a></code>.</p>
<p>In the previous example, <code>sp1</code> could be inserted after <code>sp2</code> using:</p>
<pre><code>parentDiv.insertBefore(sp1, sp2.nextSibling);</code></pre>
<p>If <code>sp2</code> does not have a next sibling, then it must be the last child — <code>sp2.nextSibling</code> returns <code>null</code>, and <code>sp1</code> is inserted at the end of the child node list (immediately after <code>sp2</code>).</p>
<h2 id="Example2" name="Example2">Example 2</h2>
<p>Insert an element before the first child element, using the <a href="/en-US/docs/DOM/Node.firstChild" title="Node.firstChild">firstChild</a> property.</p>
<pre class="brush:js">// Get a reference to the element in which we want to insert a new node
var parentElement = document.getElementById('parentElement');
// Get a reference to the first child
var theFirstChild = parentElement.firstChild;
// Create a new element
var newElement = document.createElement("div");
// Insert the new element before the first child
parentElement.insertBefore(newElement, theFirstChild);
</pre>
<p>When the element does not have a first child, then <code>firstChild</code> is <code>null</code>. The element is still appended to the parent, after the last child. Since the parent element did not have a first child, it did not have a last child either. Consequently, the new element is the only element, after insertion.</p>
<h2 id="Browser_Compatibility" name="Browser_Compatibility">Browser compatibility</h2>
<p>{{CompatibilityTable()}}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td>1.0</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Phone</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<h2 id="Specification" name="Specification">Specification</h2>
<ul>
<li><a href="http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-952280727">insertBefore</a></li>
</ul>
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