Possible to stop ASP.NET event using jQuery/javascript?

Question

I have some code like below in an aspx page:

function CheckEditing() {
      var answer = confirm('You are currently editing an item.  If you continue to the next page your changes will not be saved.  Would you like to continue?');
      if(!answer)
      {
          return false;
      }
      return true;
}

<asp:Button ID="btn_Next" runat="server" Text="Next" onclick="btn_Next_Click" OnClientClick="CheckEditing();" />

I had thought that returning false would keep my asp.net OnClick even from firing, but it still does. I've confirmed that it is getting to the return false section of code using alerts. Is there anything I can do to stop it from firing using jQuery/javascript?

Nick Craver · Accepted Answer · 2010-09-09 23:41:44Z

4

Change your OnClientClick like this:

OnClientClick="if(!CheckEditing()) return false;"

Because it renders as if(!CheckEditing()) return false; ASPNetFunction() you wouldn't want to return outright, or the second function would never run.

answered Sep 9, 2010 at 23:41

Nick Craver

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10 Comments

Abe Miessler Over a year ago

Isn't that the same thing that i'm doing now?

Nick Craver Over a year ago

@Abe - Nope, you're calling it, but not doing a return false overall...currently your return false in the function isn't being used for anything outside the function, like cancelling the onclick handler :)

Dustin Laine Over a year ago

To add to Nicks response. You could keep you JS function the same and just put OnClientClick="return CheckEditing();"

Nick Craver Over a year ago

@Dustin - You can't always, for the reasons I laid out above :) There's a function after this one that needs to be called.

Abe Miessler Over a year ago

@Nick, hmm it worked for me. Does it make a difference that one is on the client click event?

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Kushal Vaghani · Accepted Answer · 2010-09-10 00:34:00Z

0

You can achieve this also, in this way.

Declare a custom validator with the appropriate client validation function

Now, as a part of your button, set the validation group to be the same as the custom validator

Inside the function CheckEditing(), set args.IsValid = false for not going onto the onClick event

Function CheckEditing(source,args) { //... args.IsValid = false; }

answered Sep 10, 2010 at 0:34

Kushal Vaghani

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