Event listener in JavaScript with example

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Event listener in JavaScript with example
4 Answer(s) a year and 8 months ago
Posted in : JavaScript Questions

What is event listener in JavaScript? Can anyone please post an example of Event listener??

Thanks in Advance!!

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December 11, 2012 at 9:34 PM

<html>
  <head>
  <title> Add Event Listener Example </title>

</head>
<body onload="init()">
</body>

December 11, 2012 at 9:39 PM

    <html>
     <head>
        <script type="text/javascript">
            function OnButtonDown (button) {
                button.style.color = "#ff0000";
            }
            function OnButtonUp (button) {
                button.style.color = "#000000";
            }

            function Init () {
                var button = document.getElementById
                              ("testButton");
                if (button.addEventListener) {  
                   button.addEventListener ("mousedown",                       
                    function () {OnButtonDown (button)}, false);

                   button.addEventListener ("mouseup", 
                    function () {OnButtonUp (button)}, false);
                }
                else {
                 if (button.attachEvent) {   version 9
                   button.attachEvent ("onmousedown", 
                    function () {OnButtonDown (button)});
                   button.attachEvent ("onmouseup", 
                    function () {OnButtonUp (button)});
                 }
               }
            }
        </script>
     </head>
     <body onload="Init ()">
        Click on the following button and see its text color.
        <br />
        <button id="testButton">Test button</button>
     </body>
    </html>

    Here we are adding two event listeners 
    1.mouseup

December 11, 2012 at 9:39 PM

<html>
 <head>
    <script type="text/javascript">
        function OnButtonDown (button) {
            button.style.color = "#ff0000";
        }
        function OnButtonUp (button) {
            button.style.color = "#000000";
        }

        function Init () {
            var button = document.getElementById
                          ("testButton");
            if (button.addEventListener) {  
               button.addEventListener ("mousedown",                       
                function () {OnButtonDown (button)}, false);

               button.addEventListener ("mouseup", 
                function () {OnButtonUp (button)}, false);
            }
            else {
             if (button.attachEvent) {   version 9
               button.attachEvent ("onmousedown", 
                function () {OnButtonDown (button)});
               button.attachEvent ("onmouseup", 
                function () {OnButtonUp (button)});
             }
           }
        }
    </script>
 </head>
 <body onload="Init ()">
    Click on the following button and see its text color.
    <br />
    <button id="testButton">Test button</button>
 </body>
</html>

Here we are adding two event listeners 
    1.mouseup

September 27, 2011 at 12:49 PM

What is an Event Handling?

An Event - basically, an action or activity that goes on between the user and the application. In Java programming, In Java, Abstract Windowing Toolkit (AWT) handles such class and returns appropriate response to the user.

Event handling Is a method that understands the event and processes it.

Setting an even on button click

<html>

    <script language="JavaScript">
    <!--
    function clickFirstButton()
    {
      document.myForm.button1.click();
    }
    -->
    </script>
    <form name="myForm">
      <input type="button"
             value="Display alert box"
             name="button1"
             onClick="alert('You clicked the first button.')"><br>
      <input type="button"
             value="Call on button 1"
             name="button2"
             onClick="clickFirstButton()">
    </form>    
    </html>

Event Handling in Java AWT Example

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