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I'm trying to have two things happen when I click on a button in an ASP.NET page:
I've done a lot of research on this, but I've had difficulties doing either.
For #1, I thought that this should work, but it doesn't:
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub BtnSubmit_Click(sender As Object, e As System.EventArgs)
Label1.Text = "Working..."
System.Threading.Thread.Sleep(5000)
Label1.Text = "Done."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Test Page</title>
</head>
<body>
<form id="form1" runat="server">
<ajaxToolkit:ToolkitScriptManager runat="server" />
<div>
<asp:ListBox runat="server" Height="100px" />
<br />
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="BtnSubmit" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Press the button" />
</ContentTemplate>
</asp:UpdatePanel>
<br />
<asp:Button runat="server" ID="BtnSubmit" OnClick="BtnSubmit_Click" Text="Submit Me!" />
</div>
</form>
</body>
</html>
The "Working..." message is never displayed.
As for #2, I added this to the button (I forget where I found it):
OnClientClick="this.disabled = true; this.value = 'Working...';"
UseSubmitBehavior="false"
That had the desired effect of disabling the button and changing its text (value), but it wasn't possible to change it back using Text and Enabled properties.
405
I just found a solution on msdn (http://msdn.microsoft.com/en-us/library/bb386518.aspx). Added some code and remove some unnecessary parts.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnDoWork_Click(object sender, EventArgs e)
{
/// do something long lasting
System.Threading.Thread.Sleep(3000);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<script language="javascript" type="text/javascript">
<!--
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_initializeRequest(InitializeRequest);
prm.add_endRequest(EndRequest);
var postBackElement;
function InitializeRequest(sender, args) {
if (prm.get_isInAsyncPostBack()) {
args.set_cancel(true);
}
postBackElement = args.get_postBackElement();
if (postBackElement.id == 'btnDoWork') {
$get('btnDoWork').value = 'Working ...';
$get('btnDoWork').disabled = true;
}
}
function EndRequest(sender, args) {
if (postBackElement.id == 'btnDoWork') {
$get('btnDoWork').value = 'Done!';
$get('btnDoWork').disabled = false;
}
}
// -->
</script>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Hello World!"></asp:Label><br />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnDoWork" />
</Triggers>
</asp:UpdatePanel>
<asp:Button ID="btnDoWork" runat="server" Text="Start!" OnClick="btnDoWork_Click" />
</div>
</form>
</body>
</html>
What you basically do, is you register some eventHandler for Initialize_ and End_Request - in those you disable and enable your button!
HTH
188
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