URGENT: How to check if file input field is empty

Hi EE

I have written a code in html which asks the user to input a file. When the user submits the form I want to check whether the user has input the form. How can I do it?
The input command in HTML is
<INPUT TYPE=FILE id="Intfile" NAME="IntFile">

Thank you
tanpreetsinghAsked:
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hieloConnect With a Mentor Commented:
try:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd"> 
<html>
<head>
<title></title>
<script type="text/javascript">
function checkForm(f){
	if( f.IntFile.value=="" )
	{
		alert("You must select a file");
		return false;
	}
return true;
}
</script>
</head>
<body>
<form onsubmit="return checkForm(this)">
<INPUT TYPE='FILE' id="Intfile" NAME="IntFile">
<INPUT TYPE='submit' value="Submit" NAME="Submit">
</form>
</body>
</html>

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tanpreetsinghAuthor Commented:
Excellent solution. Thank you!
0
 
tanpreetsinghAuthor Commented:
Thank you. It worked smoothly.
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