Disabled button doesn't submit postback in UpdatePanel

Question

I have a button inside UpdatePanel on my ASP.NET Page. Here\'s my UpdatePanel

Answer 1

Add ClientIDMode="Static"on the button

<asp:Button ID="btnPrint" runat="server" OnClick="btnPrint_Click" ToolTip="Click to export report to PDF" Width="100px" Text="Print to PDF" OnClientClick="if(PDFClick()) {return true;} else {alert('2');}" ClientIDMode="Static" />

Answer 2

You can disable the button asynchronously with setTimeout:

<script type="text/javascript">
    function PDFClick(btnPrint) {
        btnPrint.value = "Working...";
        setTimeout(function() { btnPrint.disabled = true; }, 10);
        return true;
    };
</script>

The call to document.getElementById can be removed from PDFClick by passing a reference to the button element with the this keyword in OnClientClick:

OnClientClick="if (PDFClick(this)) { return true; } else { alert('2'); }"