The easiest solution is to allow the user to select what ever file he
wants, but before you actually submit to the server, verify that he has
selected the correct file type. Here is a simple html page that only
allows uploads of certain file types.
<HTML>
<HEAD>
<TITLE>My Upload Page</TITLE></HEAD>
<BODY>
<script language="JavaS cript">
function verifyFile()
{
if(document.fil eUpForm.uploade dFile.value == "") {
alert("Must choose a file first!");
return false;
}
if(document.fil eUpForm.uploade dFile.value.len gth < 5) {
alert("Invalid filename. Must contain proper extension.");
return false;
}
if(document.fil eUpForm.uploade dFile.value.sea rch(
/\.(doc|gif|jpg| jpeg|pdf|txt|xl s)$/
) == -1) {
alert("Invalid filename extension.");
return false;
}
return true;
}
</script>
<H2>Upload File</H2>
<form name="fileUpFor m" method="POST" enctype="multip art/form-data"
action="http://www.mycomp.com/upload/UploadHandler.a spx"
ID="Form1">
File to upload: <input name="uploadedF ile" type="file" size="40"
ID="File1" /><p>
<input type="button" name="submitbut ton" value="Submit"
onClick="if(ver ifyFile()){docu ment.fileUpForm .submit();}"
ID="Button1" />
</form>
</BODY>
</HTML>
The page only allows uploads of files with the following extension:
doc, gif, jpg, jpeg, pdf, txt, and xls. You can modify the list to
allow your file types.
sayed
