Asp .NET Button – OnClientClick=”return function()” vs OnClientClick=”function()”

In an user control I have a button:

<asp:Button ID="addButton" runat="server" Text="Add"  OnClientClick="return function()".

I had written jquery code to hide a control( validationsummary) present in the page inside function().

When I wrote “return function()” it behaved as I expected and the control got hidden. While when I wrote only “function”()” the control got hidden but reappeared. What exactly is the difference between the two?


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

First : the client side runs (OnClientClick)

Then – the server side.


The client side code can prevent execution of server side by return true/false.

usually we use it for validation , before submitting to server.

Do this and your server side will ( without hacking) never work :

OnClientClick="return false;"

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

0 0 votes
Article Rating
Notify of

Inline Feedbacks
View all comments
Would love your thoughts, please comment.x