Debugging Form Validation in Javascript
Prerequisites
Accompanies form validation assignment in COP4813
Summary
Topics covered:
Simplifying form validation
Video
Reference Materials
http://jsfiddle.net/reaglin/wZxTQ/ – Code for program
<!DOCTYPE html>
<html>
<head>
<title>Form Example</title>
<script type="text/javascript">
function ValidateForm()
{
alert("Now Validating Form");
if (!ValidateNotBlank(document.forms["inputForm"]["fname"].value, "First Name" )) return false;
if (!ValidateNotBlank(document.forms["inputForm"]["lname"].value, "Last Name" )) return false;
return true;
}
function ValidateNotBlank(val, message)
{
alert("Now validating Not blank");
if (val == null || val == "")
{
alert("Must enter a value for " + message);
return false;
}
return true;
}
</script>
</head>
<body>
<form name="inputForm" onsubmit="return ValidateForm();" method="post" action="mailto:[email protected]" >
Input First Name: <input type="text" name="fname" /><br/>
Input Last Name: <input type="text" name="lname" /><br/>
<input type="submit" value="submit" />
</form>
</body>
</html>
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