Solved

URGENT: How to check if file input field is empty

Posted on 2008-10-22
3
1,922 Views
Last Modified: 2010-08-05
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
0
Comment
Question by:tanpreetsingh
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 82

Accepted Solution

by:
hielo earned 500 total points
ID: 22779480
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>

Open in new window

0
 

Author Closing Comment

by:tanpreetsingh
ID: 31508876
Excellent solution. Thank you!
0
 

Author Comment

by:tanpreetsingh
ID: 22779634
Thank you. It worked smoothly.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
This article discusses how to implement server side field validation and display customized error messages to the client.
The viewer will learn the benefit of using external CSS files and the relationship between class and ID selectors. Create your external css file by saving it as style.css then set up your style tags: (CODE) Reference the nav tag and set your prop…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question