How can I make an html form field required, so if it's left blank the form won't be sent?

Question

I want a way to have my form have a required field so if it's left blank, the form won't be sent and I can control the number of blank e-mails I get sent. Any help? I build my own php forms so I'd appreciate it if you wouldn't suggest an online form maker or generator, I love having my site being built solely by me.

Answer 1

What you want to use is Javascript to do some client side checking before the user can click a submit button. This W3 Schools link has pretty much the exact example that you are looking to implement:

Answer 2

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Answer 3

It depends on what you're using to handle the form data. Form handling scripts allow you to put a hidden field called 'required' and list the fields that you want to be required. Like this:

This doesn't effect making the form yourself.

Answer 4

////////////////////////////////////////////////////////////////////////////////////////////
script type="text/javascript">
function ok() {
if(document.myform.foo.value.length > 0)
return true;
} else {
alert('You must include Foo');
document.myform.foo.focus();
return false;
}
}