How to disable postback on an asp Button (System.Web.UI.WebControls.Button)

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I have an asp button. It’s server-side so I can only show it for logged in users, but i want it to run a javascript function and it seems when it’s runat=”server” it always calls the postback event.

I also have a regular button (<input...>) not running at server and it works fine…

How can I make this button only run the javascript and not postback?

Answer

Have your javascript return false when it’s done.

<asp:button runat="server".... OnClientClick="myfunction(); return false;" />