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    <p>As anyways your <code>onbeforeunload</code> is interpreted through JS, you probably can use a boolean flag in a global variable to know whether it's the first time the process started by the event runs. Like:</p> <pre><code>&lt;head&gt; ... &lt;script ...&gt; var flag=true; var ret=""; function getoff() { if(flag) { //do your things and save your return value to the global variable "ret" //ret="Unsaved changes"; flag=false; //with this, the code above will be executed only once } return ret; //the second call will return the same thing as the first call, as first call's return value is stored in a global variable, and is not modified during the second call } &lt;/script&gt; &lt;/head&gt; &lt;body onbeforeunload="return getoff();"&gt; ... </code></pre> <p>Another possibility perhaps, as according to <a href="https://stackoverflow.com/q/6917074/1269732">this post</a> the problem seems to come from changing the page using JS, you can use a hidden hyperlink to change the page using HTML, something like:</p> <pre><code>&lt;a href="404.htm" id="myButton" style="display:none;visibility:hidden;"&gt;&lt;/a&gt; </code></pre> <p>Then your button could do:</p> <pre><code>&lt;input type="button" ... onclick="document.getElementById('myButton').click();"&gt; </code></pre> <p>Assuming any of this works, a hidden link like that is an ugly hack (the first possibility isn't much prettier anyway), but what doesn't require some ugly hacks when it's about having MSIE behave like if it was a web browser...</p>
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    1. POIE9 onbeforeunload called twice when window.location changed in button event... minimal reproduction
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    1. COThe flag approach does not work. If on either the first or second invocation if there is no return value (eg. "return;", "return null;") the navigation takes place. There's no way to cancel the navigation and stay on the page without IE prompting the user (so IE "thinks" both invocations are valid onbeforeunload calls).
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    2. COI get this, but the principle of the flag is to set it to false once you're in the if-block of the getoff() function, so that your code inside will be executed only once. Then, the second call to onbeforeunload will just return the same value it returned the first time (as it'll be stored in ret). Anyway, does the second approach works ?
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    3. COJust to come back to the flag approach... if you return the same value twice then the user is prompted twice. There really is no way around this using flags. However the hidden A works... except calling .click() does not actually do the navigate (this may be jquery or normal IE behavior). Adding an onclick to the A and having that do "location = '404.htm';" does work when triggered from jquery.
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