oh the value <input type="hidden" name="MAX_FILE_SIZE" value="10000000"> is file size in bytes I believe.
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JavaScript: Checking file size before accepting upload
I have a file upload bar for people to upload image. I am looking for a script that can pop up a window warning user that the file selected has file over the maximum file size limit. This script has to check the file size before starting to accept file upload. Is there anyway to do it?
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Answers
You have to create an ActiceX...Try this out..
1. Make sure you use IE 5.5 and above
2. Just allow activeX by adding that page as trusted site.
<HTML>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
function check()
{
var Objfile = new ActiveXObject("Scripting.F
var fileval = document.form1.TxtFile.VAL
var fist = objfile.getFile(fileval);
var fsize = fist.size;
alert(fsize + " bytes");
}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="form1">
<INPUT TYPE="file" NAME="TxtFile">
<INPUT TYPE="button" NAME="ButCheck" VALUE="SIZE" onClick="check();">
</FORM>
</BODY>
</HTML>
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by: jrm213jrm213Posted on 2007-10-03 at 07:25:43ID: 20006780
Hi,
No. Javascript cannot access the file system, it is one of the safeguards in place so that people don't write a javascript that is able to "harm" or "gather data from" someones computer.
I believe you can do this:
<input type="hidden" name="MAX_FILE_SIZE" value="10000000">
and if you place that right before your <input type="file"> tag it will not submit if the file is too big.
so would be like
<input type="hidden" name="MAX_FILE_SIZE" value="10000000">
<input type="file" name="myfileinputname"/>
I am not sure if this is cross-browser functionality or only works in some browsers.