how to stop browser back button using javascript

I am doing online quiz app in php. I want to restrict user while going back in exam. I have tried following script but it stops my timer. What should I do please suggest me. I have included source code. The timer is stored in 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 exam timer which takes duration of exam from mysql db and starts timer accordingly it stops when I put code for disabling back button. what will be the problem.

标签： javascript browser

21条回答

旧时光的记忆

2楼-- · 2018-12-31 04:37

I believe the perfect yet solution is actually pretty straightforward, which I used for many years now.

It's basically assigning the window's "onbeforeunload" event along with the ongoing document 'mouseenter' / 'mouseleave' events so the alert only triggers when clicks are outside the document scope (which then could be either the back or forward button of the browser)

$(document).on('mouseenter', function(e) { 
        window.onbeforeunload = null; 
    }
);

$(document).on('mouseleave', function(e) { 
        window.onbeforeunload = function() { return "You work will be lost."; };
    }
);

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牵手、夕阳

3楼-- · 2018-12-31 04:37

In my case this was a shopping order. So what I did was disable the button. When the user clicked back, the button was disabled still. When they clicked back one more time, and then clicked a page button to go forward. I knew their order was submitted and skipped to another page.

In the case when the page actually refreshed which would make the button (theoretically), available; I was then able to react in the page load that the order is already submitted and redirect then too.

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若你有天会懂

4楼-- · 2018-12-31 04:40

//"use strict";
function stopBackSpace(e) {
    var ev = e || window.event;
    var obj = ev.target || ev.srcElement;
    var t = obj.type || obj.getAttribute('type');

    var vReadOnly = obj.getAttribute('readonly');
    var vEnabled = obj.getAttribute('enabled');
    // null
    vReadOnly = (vReadOnly == null) ? false : vReadOnly;
    vEnabled = (vEnabled == null) ? true : vEnabled;
    // when click Backspace,judge the type of obj.

    var flag1 = ((t == 'password' || t == 'text' || t == 'textarea') && ((vReadOnly == true || vReadOnly == 'readonly') || vEnabled != true)) ? true : false;

    var flag2 = (t != 'password' && t != 'text' && t != 'textarea') ? true : false;

    if (flag2) {
        e.keyCode = 0;
        e.cancelBubble = true;
        return false;
    }
    if (flag1) {
        e.keyCode = 0;
        e.cancelBubble = true;
        return false;
    }
}
if (typeof($) == 'function') {
    $(function() {
        $(document).keydown(function(e) {
            if (e.keyCode == 8) {
                return stopBackSpace(e);
            }
        });
    });
} else {
    document.onkeydown = stopBackSpace;
}

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何处买醉

5楼-- · 2018-12-31 04:41

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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浪荡孟婆

6楼-- · 2018-12-31 04:41

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

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流年柔荑漫光年

7楼-- · 2018-12-31 04:41

You simply cannot and should not do this. However, but this might be helpful

<script type = "text/javascript" >
history.pushState(null, null, 'pagename');
window.addEventListener('popstate', function(event) {
history.pushState(null, null, 'pagename');
});
</script>

Works in my chrome and firefox

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