check file size at the client side

To check the size of a file (before form submission), you can do it easily as follows:

function validate_file(){

	file_obj = document.getElementById('my_file').files[0];
	if (typeof file_obj != 'undefined'){
		if (file_obj.size > 2000000){  // 2Mb
			alert('file size is greater than 2Mb');
			return false;
	return true;

If you really want to do something fancy, check out this site:

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