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On in jquery example in Jquery functions of JQuery Examples
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Note 
Example: 1 .on() function used for,
If you create some element dynamically in page, for example by append() function.
Click function will not work for dynamically created element.For that,use:

Related Topics:

Example: 2 .bind() function
Example : 1
<html>

<head>
    <title>HTML-JQuery</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $(".container").click(function () {
                $(".new").append('<div class="new">new Element</div>');
            });
            $(".new").on("click", function () {
                $(this).css("color", "blue");
            });
        });
    </script>
</head>

<body>
    <div class="container">click here to append element</div>
    <div class="new">new Element</div>
</body>

</html>
Example: 1 Demo 
Example: 2
<html>

<head>
    <title>HTML-JQuery</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $(".container").click(function () {
                $(".new").append('<div class="new">new Element</div>');
            });
            $(".new").unbind("click");
            $(".new").bind("click", function () {
                $(this).css("color", "blue");
            });
        });
    </script>
</head>

<body>
    <div class="container">click here to append element</div>
    <div class="new">new Element</div>
</body>

</html>
Example: 2  
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