Pre Submission Validation & Disabling Submit Button

Hi

My question is that I have a text box which will be filled with a number say 123456 and then another text box which will be filled by another number say 154689. What my requirement is that when i enter the value in second box , if its higher than 80% of the value in Txtbox1 , an error gets generated and the submit button gets disabled.

Can this be done by using any hooks ?

Also another request is that the form has a conditional logic set to show/hide the submit button, but i feel it would have been great to see an option of just "Disabled" too.

I look fwd for an early reply.

thanks!

Hi Chris

Thanks for the quick reply. Well my question was different. What I need is something like this
Using Javascript i would have done it like below
textbox2 : OnChange="validateFunc();" and this validateFunc has code in it to give an error message and also disable or hide the submit button.
How can i do it here ?
I hope i make a sense.
Thanks!

Hi Chris

See the below form
http://hidayahsoft.com/demo/?page_id=2
I have created it using GF and i like the way it works.
If you notice that I have two textboxes (number boxes) named as
Estimated Market Value of Property ($)* and Requested Loan Amount ($)*
I have a validation done on them, some 3 types of validations depending on the value of the element input_1 .

I wish i could do something like conditional logic i have done on the bottom radio buttons. If you see if user chooses "NO", the HTML element comes up and the Submit button hides . I wish same thing happens for the textboxes i named above. Meaning when i type say 222222222 no in textbox 2 while i'm still typing i get error msg , PRESUBMISSION thing.

Thanks!