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Editorial Team
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Asked: 2026-06-13T10:15:28+00:00

what exactly is happening when PHP is putting contents (1 MB for example) in

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what exactly is happening when PHP is putting contents (1 MB for example) in a file and the user closes the tab?
Could the file be corrupted? How can I avoid that?
Thanks a lot

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1 Answer

  1. Editorial Team

    This is more a client-side issue…

    I solved this problem using Javascript’s window.onbeforeunload and window.onunload functions:

    <head>
<script>
var invalid_exit=0;
var submitted=0;

window.onbeforeunload = function(){ 
    if (invalid_exit==1  && submitted==0 ){
        return 'You will lose your progress!';
    }
}

window.onunload = function(){ 
    if (invalid_exit==1  && submitted==0 ){
    //ajax call when an invalid exit is happening...        
    }
</script>
</head>

    In this case, I used to control variables: invalid_exit and submitted….

    You can check if a user clicks a submit button(submitted=1), closes the browser(invalid_exit=0), refreshes the page(invalid_exit=0), etc… Depending on your requirement….

    With Jquery you can control every event…

    I hope this can help you out!!!

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