Force a user to scroll to the end of a textarea.

There are instances where you want to force a user to view an entire piece of text. The particular instance that comes to mind is in the case of License Agreements. You want to be sure that the user has, at least, scrolled through the entire agreement before allowing them to proceed.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
	<title>Scroll Test</title>
	<script language="JavaScript">
	<!--
	
	function textareaAtEnd(textareaObj)
	{
		return ((textareaObj.scrollTop + textareaObj.offsetHeight) > textareaObj.scrollHeight);
	}

	function formValidation(formObj)
	{
		if (textareaAtEnd(formObj.licenseAgreement))
		{
			return true;
		}
		else
		{
			alert ("Please scroll to the end of the license agreement.")
			return false;
		}
	}

	// -->
	</script>
</head>

<body>

<form action="javascript: alert('Form submitted!');" onSubmit="return formValidation(this);">

	<p>
	License Agreement:<br />
	<textarea name="licenseAgreement" rows="10" cols="45">This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.
	
	This is my long, long license agreement where you agree to all of my demands.</textarea>
	</p>

	<p>
	<input type="submit" value="Submit">
	</p>

</form>

</body>
</html>