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jQuery - map( callback ) Method


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Description:

The map( callback ) method translates a set of elements in the jQuery object into another set of values in a jQuery array which may, or may not contain elements.

You could use this method to build lists of values, attributes, css values - or even perform special, custom, selector transformations.

Syntax:

Here is the simple syntax to use this method:

selector.map( callback )

Parameters:

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

  • callback: The function to execute on each element in the set.

Example:

Following is a simple example a simple showing the 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(){
      var mappedItems = $("li").map(function (index) {
      var replacement = $("<li>").text($(this).text()).get(0);
      if (index == 0) {
        // make the first item all caps
        $(replacement).text($(replacement).text().toUpperCase());
      } else if (index == 1 || index == 3) {
        // delete the second and fourth items
        replacement = null;
      } else if (index == 2) {
        // make two of the third item and add some text
        replacement = [replacement,$("<li>").get(0)];
        $(replacement[0]).append("<b> - A</b>");
        $(replacement[1]).append("Extra <b> - B</b>");
      }

      // replacement will be an dom element, null, 
      // or an array of dom elements
      return replacement;
    });
    $("#results").append(mappedItems);

  });
  </script>
  <style>
     body { font-size:16px; }
     ul { float:left; margin:0 30px; color:blue; }
     #results { color:red; }
  </style>
</head>
<body>
  <ul>
    <li>First</li>
    <li>Second</li>
    <li>Third</li>
    <li>Fourth</li>
    <li>Fifth</li>
  </ul>
  <ul id="results">
  </ul>
</body>
</html>

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



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