Disable client side validation for fields in Web Forms

Disabling validation for hidden fields with ASP.NET Web Forms is certainly not as easy as doing with with ASP.NET MVC as I have posted about before, but it is totally doable.

You will have to work with the Page.Validators object on the client side. It is a global variable call Page_Validators, it is an array that contains all your validators for the page.

Basically you can cycle through this array and disable validators based on the validators id, you use a javascript function called ValidatorEnable() to enable/disable validators as you hide and show sections of your form.

Here is a code sample:

for (i = 0; i < Page_Validators.length; i++) {
    if (Page_Validators[i].id === "<%= RequiredFieldValidatorOne.ClientID %>") {
        ValidatorEnable(Page_Validators[i], false);
    if (Page_Validators[i].id === "<%= RequiredFieldValidatorTwo.ClientID %>") {
        ValidatorEnable(Page_Validators[i], true);

Hopefully this saves you some time down the line for your more complex ASP.NET Web Forms.


Published by

Alan Feekery

Developer, Gamer, Musician, Cyclist and big Motorsport fan... enjoys the odd cup of coffee :)

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