How can I stop the browser back button using JavaScript?

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I am doing an online quiz application in PHP. I want to restrict the user from going back in an exam.

I have tried the following script, but it stops my timer.

What should I do?

The timer is stored in file cdtimer.js.

<script type="text/javascript">
    window.history.forward();
    function noBack()
    {
        window.history.forward();
    }
</script>

<body onLoad="noBack();" onpageshow="if (event.persisted) noBack();" onUnload="">

I have the exam timer which takes a duration for the exam from a MySQL value. The timer starts accordingly, but it stops when I put the code in for disabling the back button. What is my problem?

35 Answers
35

There are numerous reasons why disabling the back button will not really work. Your best bet is to warn the user:

window.onbeforeunload = function() { return "Your work will be lost."; };

This page does list a number of ways you could try to disable the back button, but none are guaranteed:

http://www.irt.org/script/311.htm

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