Enable / Disable Field

[Brianfree]

Hi, i have a text field which a user has two type a number plate into. Please can someone show me how to make a button enabled if something is typed in & disable it again if they delete what they typed in?

Many thanks,

Brian

 

[feherke]

Hi

If we take your word "typed" strictly, then this :

<input type="text" value="" onkeyup="this.form.whatever.disabled=this.value==''">
<input type="button" name="whatever" disabled="disabled">

Note that the [tt]onkeyup[/tt] event will not be triggered if someone fills the [tt]input[/tt] by pasting the text with mouse. So usually the [tt]onchange[/tt] event is used in such case. The price is that the event happens only when the [tt]input[/tt] looses the focus.

But also note that neither the [tt]onchange[/tt] event will be triggered if the [tt]input[/tt] is filled programmatically, for example by the browser's [tt]form[/tt] completing functionality.

Feherke.

http://rootshell.be/~feherke/

 

[BillyRayPreachersSon]

Of course, server-side validation as well would be a good thing...

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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

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

Code Couch Tech Snippets & Info:

http://www.codecouch.com/