Question

Hi I have a textbox and a datepicker control.

The validator requires that neither can be selected. ie. both blank. However if one has a value the other must also have a value.

Can anybody tell me how to implement this given that a CustomValidator requires a RequiredFieldValidator to fire?

Answer 1

Use a custom validator and have the following client side code…

function CheckControls(sender, args){

    if(GetElement('Control1').Value != '')
    {
      if(GetElement('Control2').Value == '')
      {
         args.IsValid = false;
         return;
      }
    }

    args.IsValid = true;
    return;

}

function GetElement(id){

    if(document.all){
        return document.all[id];
    }else {
        return document.getElementById(id);        
    }

}