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Prevents the user from selecting a filename with a space (known to cause problems with some CGI-scripts). The visitor are informed that the field can not have spaces. Of course, you could change the character it checks for as well as the invalid alert message to something else to suit your needs.

Try to select a file with a space in it's name or in it's path!

Add the below code to the <body> section of your page:

Select All


		<script 
		language="javascript"
		type="text/javascript">

		/* Visit http://www.yaldex.com/ 
		for full source code

		and get more free JavaScript, CSS and DHTML scripts! */

		<!-- Begin

		function 
		validate(){

		var 
		invalid =
		" ";
		// Invalid character is a space

		

		if
		(document.submitform.filename.value.indexOf(invalid)
		>
		-1)
		{

		alert("Sorry, 
		spaces are not allowed.");

		return
		false;

		}

		else
		{

		return
		true;

		   
		}

		}

		//  End -->

		</script>

		Try to select a file with a space in 
		it's name or in it's path! <br><br>

		<form
		name=submitform
		onSubmit="return 
		validate()">

		<input 
		type=file
		name=filename>

		<br>

		<input
		type=submit
		value="Submit">

		</form>

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