Prevent LinkButton post back OnClientClick not working. Why?

I know there are plenty of answers surrounding this topic but I just cannot get this to work.

I need to prevent a link button posting back and the following code is not working. The code is definitely being hit in all the required places.

Link button definition:

  <asp:LinkButton ID="NavHelp" OnClientClick="showConfirm(event);" OnClick="NavHelp_Click" ToolTip="Help" runat="server"></asp:LinkButton>

Javascript function (definitely being hit)
function showConfirm(event) {
  return false;

However after showConfirm returns false the link button still posts back to the server side NavHelp method.

As a side note, I also put a breakpoint in the __doPostback method generated by .NET and it does get hit after showConfirm returns false.

Can anyone shed any light on this?


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Method 1

Right, figured it out. I needed to include the return statement in the OnClientClick attribute:

OnClientClick="return showConfirm(event);"


Method 2

incidentally, you can use your original code, but rather than using event.stopPropagation() you can use event.preventDefault()

so your code would be

<asp:LinkButton ID="NavHelp" OnClientClick="showConfirm(event);" OnClick="NavHelp_Click" ToolTip="Help" runat="server"></asp:LinkButton>

function showConfirm(event) {
  return false;

read some more on event.preventDefault() vs event.stopPropagation()
here :

basically the preventDefault prevents the elemnt from carrying out its dfault action, i.e. visting a link or submitting a form, while stoppropagation allows the dfault action to occur, BUT doesn’t inform any parent elements that it has happened.

i created a little jsfiddle : that shows you the prevent default, this should allow you to put in your own javascript logic, display modals etc, before successfully pushing through the link click.

Method 3

This works:

<asp:LinkButton ID="NavHelp" ClientIDMode="Static" OnClientClick="showConfirm(event);" OnClick="NavHelp_Click" ToolTip="Help" runat="server"></asp:LinkButton>
    $("#NavHelp").click(function(event) {
        if (showConfirm()) {
            return false;
        return true;

Method 4

Add Return statement in onClientClick Javascript Event

OnClientClick="return showConfirm(event);"

So when showConfirm return false then request will not be transer to server and page not postback.

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

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