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// check file size before uploading if browser support html5
if (window.File && window.FileList) {
function checkFileUpload(evt) {
var f = evt.target.files[0];
if (f.size > max_upload_size) {
document.getElementById('upload_button').value = "File too big";
document.getElementById('upload_button').disabled = true;
} else {
document.getElementById('upload_button').value = "Upload";
document.getElementById('upload_button').disabled = false;
}
}
document.getElementById('file').addEventListener('change', checkFileUpload, false);
}
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