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Asked: 2026-06-05T09:30:27+00:00

how to get file size in javascript or jquery with rails here by word

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how to get file size in javascript or jquery with rails here by word size i means to say content size of file like 100kb.

here i got some methods like size or file size but its not working for me

my ruby code is 

<%= upload_form.file_field  :upload_file_name1,:onchange =>"return         validateFileExtension(this)"%>




 function validateFileExtension(fld) {
alert(fld.value.fileSize);
  if(!/(\.jpg|\.gif|\.png)$/i.test(fld.value)) {
    alert("Invalid file type! Kindly upload in a JPG, GIF or PNG format!");
    fld.parentNode.innerHTML = fld.parentNode.innerHTML;
    fld.focus();
    return false;
  }
  return true;
}
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1 Answer

  1. Editorial Team
    <html>
<head>
<script language="JavaScript">
function A()
{
var oas = new ActiveXObject("Scripting.FileSystemObject");
var d = document.a.b.value;
var e = oas.getFile(d);
var f = e.size;
alert(f + " bytes");
}
</script>
</head>
<body>
<form name="a">
<input type="file" name="b">
<input type="button" name="c" value="SIZE" onClick="A();">
</form>
</body>
</html>
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