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Find The Size Of File Before Saving Using Html5 & Javascript

  1. <input type="file" id="fileUpload" onchange="GetSize()" />  
  2. <script type="text/javascript">  
  3.        function GetSize() {  
  4.            var fileUpload = document.getElementById("fileUpload");  
  5.            if (typeof (fileUpload.files) != "undefined") {  
  6.                var size = parseFloat(fileUpload.files[0].size / 1024).toFixed(2);  
  7.                alert(size + " KB");  
  8.            } else {  
  9.                alert("Sorry! This browser does not support HTML5.");  
  10.            }  
  11.        }  
  12. </script>