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<!DOCTYPE html>
<html lang='en'><head><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
<div class="entry-content">
        <div class="entry-title roundTop">
          
          <h1 class="jq-clearfix">jQuery.inArray()</h1>
          <div class="entry-meta jq-clearfix">
                        Categories:
            <span class="category"><a href="http://api.jquery.com/category/utilities/" title="View all posts in Utilities">Utilities</a></span>
  

          </div>

</div>
<div id="jQuery-inArray1" class="entry method">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">jQuery.inArray( value, array [, fromIndex]  )</span> <span class="returns">Returns: <a class="return" href="http://api.jquery.com/Types/#Number">Number</a></span>
</h2>
<div class="jq-box roundBottom entry-details">
<p class="desc"><strong>Description: </strong>Search for a specified value within an array and return its index (or -1 if not found).</p>
<ul class="signatures"><li class="signature" id="jQuery-inArray-value-array-fromIndex">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.2/">1.2</a></span>jQuery.inArray( value, array [, fromIndex] )</h4>
<p class="arguement"><strong>value</strong>The value to search for.</p>
<p class="arguement"><strong>array</strong>An array through which to search.</p>
<p class="arguement"><strong>fromIndex</strong>The index of the array at which to begin the search. The default is 0, which will search the whole array.</p>
</li></ul>
<div class="longdesc">
<p>The <code>$.inArray()</code> method is similar to JavaScript's native <code>.indexOf()</code> method in that it returns -1 when it doesn't find a match. If the first element within the array matches <code>value</code>, <code>$.inArray()</code> returns 0.</p>
<p>Because JavaScript treats 0 as loosely equal to false (i.e. 0 == false, but 0 !== false), if we're checking for the presence of <code>value</code> within <code>array</code>, we need to check if it's not equal to (or greater than) -1.</p>
</div>
<h3>Example:</h3>
<div class="entry-examples" id="entry-examples"><div id="example-0">
<h4><span class="desc">Report the index of some elements in the array.</span></h4>
<pre class="prettyprint"><code class="example demo-code">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
  &lt;style&gt;
  div { color:blue; }
  span { color:red; }
&lt;/style&gt;
  &lt;script src="http://code.jquery.com/jquery-1.7rc2.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
  
&lt;div&gt;"John" found at &lt;span&gt;&lt;/span&gt;&lt;/div&gt;
&lt;div&gt;4 found at &lt;span&gt;&lt;/span&gt;&lt;/div&gt;
&lt;div&gt;"Karl" not found, so &lt;span&gt;&lt;/span&gt;&lt;/div&gt;
&lt;div&gt;"Pete" is in the array, but not at or after index 2, so &lt;span&gt;&lt;/span&gt;&lt;/div&gt;
&lt;script&gt;var arr = [ 4, "Pete", 8, "John" ];
var $spans = $("span");
$spans.eq(0).text(jQuery.inArray("John", arr));
$spans.eq(1).text(jQuery.inArray(4, arr));
$spans.eq(2).text(jQuery.inArray("Karl", arr));
$spans.eq(3).text(jQuery.inArray("Pete", arr, 2));
&lt;/script&gt;

&lt;/body&gt;
&lt;/html&gt;</code></pre>
<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></div>
</div>
</div>

        </div>

</body></html>