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I have a html button and a hidden field like this
<button id="btnperfdel" runat="server" type="button" class="btn btn-outline-secondary" onclick="myconfirm"></button>
<asp:HiddenField ID="myanswer" runat="server" ClientIDMode="Static" />

and this is my script that i want to run
<script type = "text/javascript">
      function myconfirm() {

          var myanswer = document.getElementById("myanswer")

          if (confirm("Confirm Delete?")) {
              myanswer.value = "Yes"
          else {
              myanswer.value = "No"


and this is my background code
Protected Sub btnperfdel_ServerClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnperfdel.ServerClick

       If myanswer.Value = "Yes" Then
           'some random things
           ClientScript.RegisterStartupScript(Me.GetType(), "alert", "alert('You clicked Cancel')", True)
       End If
   End Sub

But the javascript is not firing for onclick event. I tried onclientclick but if only returns alert 'You clicked cancel'.

What I have tried:

I tried other javascripts also, but all returns false value for onclientclick event and for onclick event, it doesn't doing anything. I'm novice in javascript. Please,Can someone help me out?
Bob@work 27-Oct-21 18:18pm
You're trying to run a javascript triggered by a DOM even, but the button is controlled by the server. The button attribute runat="server" preempts the onclick="myconfirm" and treats the button like a server-side control, not part of the DOM.

Using your browser, right-click the button and inspect it. you'll see what the server is doing to the button code.

The asp page code:
<asp:button id="LoginButton" runat="server" commandname="Login" text="Log In" validationgroup="LoginUserValidationGroup">

will generate something like this on the user's browser:

< input type="submit" name="ctl00$MainContent$LoginUser$LoginButton" value="Log In" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$MainContent$LoginUser$LoginButton", "", true, "LoginUserValidationGroup", "", false, false))" id="ctl00_MainContent_LoginUser_LoginButton" >

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