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Prompt user before navigate away from current page where user typed some text using javascript

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In your application suppose user putting the data, then user accidently click the outside link or clode button of browser. In this situation user may loose his entered data.

 To avoid this we can propmt user about his unsaved data by using symple javascript code.

 This code will prompt the user about unsaved data in current page.

 following is the javascript code snippet 


<html>
<head>
<title>window.onbeforeunload example</title>
<script type="text/javascript">
var unsaved = false;

window.onbeforeunload = function() {
    if (unsaved) {
        return "You have unsaved data. Are you sure you wish to leave this page.";

    }

};


</script>
</head>
<body>
<input type="text" id="input1" onkeydown="unsaved = true;"/>
<input type="submit" id="input1" onclick="unsaved = true;"/>
</body>
</html>

Try your self and let me know your comments

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