Disabling/enabling requiredFieldValidators with javascript and server side

Question

I have a drop down (dropdown2) that is required IF there is something in it but it\'s options data is driven by ajax from another dropdown (dropdown1) selec

Answer 1

So I didn't get JonH answer to work, and the rest is only client side. So this is my solution:

To disable a RequiredFieldValidator on the client side:

ValidatorEnable(document.getElementById("rfv"), false);

To disable a RequiredFieldValidator on the server side you can override the Validate() method like this:

public override void Validate()
{
    bool disableRfv = input_to_check <> 1;
    rfv.Enabled = disableRfv;
    base.Validate();
}

Or, in VBasic:

Public Overrides Sub Validate()
    Dim disable_rfv As Boolean = input_to_check <> 1
    rfv.Enabled = disable_rfv

    MyBase.Validate()
End Sub