Easy Javascript number check

[davejam]

Hi all,

been a while since i've been dabbling in javascript this much!!!

I have a form, when i leave a field i want to verify its the correct data type ie. number, if not put up a warning then go back to the box with the content highlighted.

This is, as i remembe it, a simple bit of code but for the life of me can i remember it off the top of my head.

can anyone save me some time, i know you have to pas 'this' to the function so you can focus back on the field but i think my brain may explode if i keep trying/searching for the answer.

Cheers



daveJam

*two wrongs don't make a right..... but three lefts do!!!!*

 

[BillyRayPreachersSon]

There are more ways to do this than there are of skinning a cat... but here's one possible way:

<input type="text" onblur="checkField(this);" />

...

function checkField(field) {
	if (field.value == '') {
		alert('Field cannot be blank');
		field.focus();
		return(false);
	}

	if (isNaN(field.value)) {
		alert('Field must contain a number');
		field.focus();
		return(false);
	}
}

Hope this helps,
Dan

Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

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[Dhagaxtuur]

Check this tutorial:

http://pctalknet.com/javascript/forms.php

and this is complete form validation code:

http://pctalknet.com/scripts/

 

[BillyRayPreachersSon]

daveJam,

Did you resolve your problem?

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

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[/tt]

 

[davejam]

Just looking at it now, got sidetracked with transact side of things, will this work if the fields are decimal(2)?

Anyway, i'll be testing this in just a sec.

Cheers

daveJam

*two wrongs don't make a right..... but three lefts do!!!!*

 

[BillyRayPreachersSon]

will this work if the fields are decimal(2)?

Probably - because that sounds like aserver-side thing, and should have no bearing whatsoever on the client-side.

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]