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Can JavaScript stop a form from being submitted?

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Nov 20.2010

I was wondering if there was a way to keep a form from being submitted with erroneous information.

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JavaScript

3 Comments(s) ↴

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@FangNov 20.2010 — With a validation script you can, but checks MUST be made server-side as well.
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@Mr_Initial_ManauthorNov 20.2010 — Validation script?
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@FangNov 20.2010 — Basic construct[CODE]<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>

<script type="text/javascript">
window.onload=function() {
document.forms[0].onsubmit = function() {return validate(this);};
};

function validate(f) {
if(f.foobar.value==='') {
alert('foobar is empty');
f.foobar.focus();
return false;
}
return true;
}
</script>

<style type="text/css">
* {margin:0;padding:0;}
</style>

</head>
<body>
<form action="" method="post" name="form1">
<label>foobar: <input type="text" name="foobar"></label>
<button type="submit">submit</button>
</form>
</body>
</html>
[/CODE]
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