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# jQuery - filter( fn ) Method

# Description:

The filter( fn ) method filters all elements from the set of matched elements that do not match the specified function.

# Syntax:

Here is the simple syntax to use this method:

    selector.filter( selector )

## Parameters:

Here is the description of all the parameters used by this method:

- fn: The function is called with a context equal to the current element just like $.each. If the function returns false, then the element is removed otherwise the element is kept.

# Example:

Following is an example showing a simple usage of this method:

    <html>
    <head>
    <title>the title</title>
       <script type="text/javascript"
       src="/jquery/jquery-1.3.2.min.js"></script>
       <script type="text/javascript" language="javascript">

       $(document).ready(function() {
          $("li").filter(function (index) {
            return index == 1 || $(this).attr("class") == "middle";
          }).addClass("selected");
       });

       </script>
       <style>
          .selected { color:red; }
      </style>
    </head>
    <body>
       <div>
       <ul>
         <li class="top">list item 1</li>
         <li class="top">list item 2</li>
         <li class="middle">list item 3</li>
         <li class="middle">list item 4</li>
         <li class="bottom">list item 5</li>
         <li class="bottom">list item 6</li>
       </ul>
       </div>
    </body>
    </html>

This would generate following result:

    <html>
    <head>
    <title>the title</title>
       <script type="text/javascript"
       src="/jquery/jquery-1.3.2.min.js"></script>
       <script type="text/javascript" language="javascript">

       $(document).ready(function() {
          $("li").filter(function (index) {
            return index == 1 || $(this).attr("class") == "middle";
          }).addClass("selected");
       });

       </script>
       <style>
          .selected { color:red; }
      </style>
    </head>
    <body>
       <div>
       <ul>
         <li class="top">list item 1</li>
         <li class="selected">list item 2</li>
         <li class="selected">list item 3</li>
         <li class="selected">list item 4</li>
         <li class="bottom">list item 5</li>
         <li class="bottom">list item 6</li>
       </ul>
       </div>
    </body>
    </html>

To understand it in better way you can Try it yourself.

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