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javascriptjqueryfile-type

How to attach an event to check the file size before upload on all input type="file"?

I would like to attach an event to all the input type="file" on my website to check if the file size is superior to 5mo, and if so block the upload and display a warning instead. Is it possible?

Solution

  • You can just bind the change event with jQuery:

    $('input[type="file"]').change(function(){
    var f=this.files[0];
    var sizeInMb = f.size/1024;
    var sizeLimit= 1024*5; // if you want 5 MB
    if (sizeInMb > sizeLimit) {
        alert('Sorry the file exceeds the maximum size of 5 MB!');
        // reset the input (code for all browser)
        this.replaceWith(input.val('').clone(true));
        return false;
    }
    else {
        // go on
    }
}

    Hope this helps.