Always return true when click on button when use jquery dialog

Question

I am using jquery dialog box. When I click on Button popup is open but it return true and excute server side event of button.

I want when user clicks on yes then return true and else return false.

    function btnCancelClick()
            {
                $("#dialog:ui-dialog").dialog("destroy");

                $("#dialog-confirm").dialog({
                    resizable: false,
                    height: 140,
                    width: 400,
                    modal: true,
                    buttons: {
                        "Yes": function ()
                        {                       
                            $(this).dialog("close");
                                  return true;
                        },
                        No: function ()
                        {                       
                            $(this).dialog("close");
                                return false;
                        }
                    }

                });             
            }

    <asp:Button ID="btnCancel" runat="server" Text="Cancel Appointment" CssClass="cssbutton"
                                    OnClientClick="return btnCancelClick();" OnClick="btnCancel_Click" />

Answer 1

Update your btnCancelClick method to always return false. Then in the dialog button handlers, instead of return true or false do your postback right there.

function btnCancelClick() {
    $("#dialog:ui-dialog").dialog("destroy");

    $("#dialog-confirm").dialog({
        resizable: false,
        height: 140,
        width: 400,
        modal: true,
        buttons: {
            "Yes": function () {
                $(this).dialog("close");
                <%=ClientScript.GetPostBackEventReference(btnCancel, "")%>;
            },
            No: function () {
                $(this).dialog("close");
            }
        }
    });
    return false;
}

This line:

<%=ClientScript.GetPostBackEventReference(btnCancel, "")%>

will register the javascript postback call into your btnCancelClick method.

Answer 2

You cannot return from a dialog.

You have to use a callback function.

$("#dialog-confirm").dialog({
    resizable: false,
    height: 140,
    width: 400,
    modal: true,
    buttons: {
        Yes: function() {
            $(this).dialog("close");
            clickedYes(); //YES CALLBACK
        },
        No: function() {
            $(this).dialog("close");
            clickedNo(); //NO CALLBACK
        }
    }
});