Run custom Javascript whenever a client-side ASP.NET validator is triggered?

Question

Is there a way to run some custom Javascript whenever a client-side ASP.NET validator (RequiredFieldValidator, RangeValidator, etc) is triggered?

Basically, I have a complicated layout that requires I run a custom script whenever a DOM element is shown or hidden. I'm looking for a way to automatically run this script when a validator is displayed. (I'm using validators with Display="dynamic")

Community · Accepted Answer · 2017-05-23 11:48:44Z

2

See this comment for how I managed to extend the ASP.Net client side validation. Others have managed to extend it using server side techniques.

edited May 23, 2017 at 11:48

CommunityBot

11 silver badge

answered Oct 2, 2008 at 4:14

Geoff

3,7792 gold badges31 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Seth Petry-Johnson Over a year ago

I was hoping that ASP.NET provided a public API to do this, but overwriting the JS functions will work.

Seth Petry-Johnson · Accepted Answer · 2008-10-02 03:19:05Z

0

The best solution I've identified for my specific situation is this:

Create a global JS data structure mapping control IDs to a visibility state.
Register the client IDs of the validators (or anything else, for that matter) in this data structure.
Every 250 milliseconds, loop through the global data structure and compare the cached visiblity state with the element's current state. If the states are different, update the cache and run the custom resize script.

This is ugly in lots of ways, and it's only a solution for my specific scenario, not the abstract case where we want to piggyback arbitrary code onto the showing/hiding of a validator. I'd love a better suggestion!

answered Oct 2, 2008 at 3:19

Seth Petry-Johnson

12.1k7 gold badges52 silver badges70 bronze badges

Comments

Leon Tayson · Accepted Answer · 2008-10-02 04:05:11Z

0

i'm not sure if got your question right but here goes... you can add a custom validator (or maybe handle the onblur event), in your javascript custom validation, you can call Page_ClientValidate() and check for Page_IsValid for errors. Something like the code below:

function customValidation()
{
    Page_ClientValidate();
    if(!Page_IsValid)
    { //run your resize script }
}

HTH,

answered Oct 2, 2008 at 4:05

Leon Tayson

5,0517 gold badges41 silver badges36 bronze badges

1 Comment

Seth Petry-Johnson Over a year ago

That's certainly better than the hack I'm currently using, but I was really looking for a way to tap into the validation cycle at a global level, rather than handling each validator individually.

Collectives™ on Stack Overflow

Run custom Javascript whenever a client-side ASP.NET validator is triggered?

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related