On Saturday 09 December 2006 15:03, Matt Wilson wrote:
> This is probably a trivial problem. I have a textarea input box in a
> form. I want to trigger some javasscript code when the user types too
> much into the box.
>
> For example, once the user types 101 characters, I'd like to pop up an
> alert that says "You have typed more than the maximum allowed!"
>
> How can I do this?
You need to attach a function to the input elements onkeyup event, like this:
function validate_input(event) {
if(event.target().value.length > 100) {
alert("you typed more than 100 characters");
}
}
MochiKit.Signal.connect(my_form.elements['elementname'], 'onkeyup',
validate_input);
But you are aware that the html input controls have a limit property
themselves, called "maxlength".
Diez
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