Form Validation.

shank888 · May 17, 2007

It looks to me there is alot of form validation help. and it looks like there is a few ways of doing this.

I am making a form to create a pop-up when the values entered are incorrect. here is my code:


<html>
<head>
<title> Babble-net validator</title>
<script type="javascript">
function validate() {
	if (document.register.username.value == "" || " ") {
		alert("Invalid Username");
		document.register.username.focus();
		return false;
	}
}
</script>

</head>
<body>
<form name='register' id='register'>
Username:
<input type='text' id='username' name='username'/>
<input type='submit' value='register' name='go' id='go' onsubmit="Validate();"/>
</form>
</body>

xenophobia · May 18, 2007

function IsEmpty(aTextField) {
if ((aTextField.length==0) || (aTextField==null)){
	return true;
}else{
	for(var i=0; i<aTextField.length; i++){
		if(aTextField.charAt(i) != " "){
			return false;
		}
	}
	return true;
}
}

Use this function to validate an empty fields:

function validate() {
	if (IsEmpty(document.register.username.value)) {
		alert("Invalid Username");
		document.register.username.focus();
		return false;
	}
}

A lots of validation function out there. Try search through the web.

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Form Validation.

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