Validators - How to enable/disable validation of Control A on the client side based on the input from Control B


I've come across the problem when I wanted to use client side validation (no matter of which type) depending on the input from a different control.

The scenario is: I have two textboxes A and B. A does not need to be validated (no validator associated with A). The textbox B has to be validated if and only if the A has any value.

I know this is trivial with custom validator in the server side mode... But unfortunately I want it to run the validation on the client side. And I also know that I can write a javascript function for the ClientValidationFunction and hardcode client id of the parent control - that's not a problem, but that is not the cleanest solution...

I have already started building my custom validator control, but maybe the solution is much simpler than I think.

Do you have any idea?

Robert Kafarski,

Aure Entuluva!
- Day shall come again!
7/8/2007 3:23:01 AM 3498 articles. 0 followers. Follow

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Hey..In order to execute the input validation in a controlled manner, try defining different validation group for different set of validators and the buttons accordingly. For example, say Textbox A has validation group "A" and TextBoxB has validation group "B" and your button "Button1" has validation group "A" defined. Now, the button click will validate only those validation with validation group of "A" it?

Ziyad Mohammad
7/8/2007 4:01:42 AM

Hi Ziyad,

To be more precise: I need the validation to be triggered by one button.

I know how validation groups work, but I do not see the solution using them in my case, because there is only one validation group here.

The TextBox A does not need to be validated, but only the TextBox B when the TextBox A has any value.

The tricky thing is when I click the button, my validation should only be done when I have a value in the "parent" control and it has to be done on the client side. As I mentioned before, I can do it using custom validator and javascript, but I was looking for something simpler and more clean. I have no idea if this can be done in the vanilla version of the .net 2.0 framework...

Robert Kafarski,

Aure Entuluva!
- Day shall come again!
7/8/2007 4:17:18 AM


I am going to describe what I would like to do in more understable way:

In my case I have a choice of creating one or two database records in two separate tables. One record would consist of contact info and the optional second one - user account related data.

I would like to create a user account only if a username is provided in the textbox A. And if the username in the textbox A is not an empty string then I would like to make password field - TextBox B required.

If they are both empty I do not want to create a user account.

I would like this to be evaluated on the client side...

I appreciate any suggestion!

Robert Kafarski,

Aure Entuluva!
- Day shall come again!
7/8/2007 4:46:21 AM

Then my answer is you have to disable the validator from javascript. There is a better way to disable the  validator in javascript using the following function and the flip side is it will work only in IE

ValidatorEnable(<Validator Name>, <boolean - true or false>);

Hence, in your javascript, you can check the text length of username and then enable /disable the validators accordingly...

Ziyad Mohammad
7/8/2007 5:39:39 AM

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