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How do I update only a panel on check changed?

<asp:UpdatePanel id="up1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:CheckBox ID="chkParent" runat="server" autopostback="true" OnCheckedChanged="chkParent_OnCheckedChanged" />
<asp:DataList ID="ChildList" runat="server" OnItemDataBound="ChildList_OnItemDataBound">
</ContentTemplate>
</asp:UpdatePanel>
protected void chkParent_OnCheckedChanged(object sender, EventArgs e)
{
this.ChildList.DataSource = this.ChildValues;
this.ChildList.DataBind();
}
On check changed of parent, child gets updated but the entire page also loads. Any way to avoid it?

Why no render partial with UpdatePanel?

I need partial render with ajax; I don't know what is wrong. ¿What is the problem?
My code:
ascx
<div id="temasatratar" onclick="__doPostBack('UpdatePanel1', '');"><h1>Temas a tratar</h1></div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" OnLoad="UpdatePanel1_Load">
<ContentTemplate>
<asp:Label runat="server" ID="Label1" />
</ContentTemplate>
</asp:UpdatePanel>
ascx.cs
protected void UpdatePanel1_Load(object sender, EventArgs e)
{
Random rnd = new Random();
int number = rnd.Next(0, 99999);
Label1.Text = "Best "+number;
}
Any suggest?
My application: Sharepoint - Visual web part / C# / Asp.Net / Visual Studio

I would use a fake-button that is invisible as trigger for the UpdatePanel:
<div id="temasatratar" onclick="__doPostBack('fakeButton', '');"><h1>Temas a tratar</h1></div>
<asp:LinkButton ID="fakeButton" style="display:none" runat="server" Text="foo" OnClick="fakeButton_Click" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" OnLoad="UpdatePanel1_Load">
<ContentTemplate>
<asp:Label runat="server" ID="Label1" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="fakeButton" />
</Triggers>
</asp:UpdatePanel>
Now this click-event is handled in an async postback when the user clicks on the div.
protected void fakeButton_Click(Object sender, EventArgs e)
{
// you are in an asynchronous postback now
}

Multiple UpdateProgress controls on a single page

I have a page with several UpdatePanel controls, each with a related UpdateProgress. When the asynchronous requests are posted back, only the first UpdateProgress control is displayed. The other requests complete successfully, but the UpdateProgress is not shown.
How can I get all the update panels on the page to show properly?
Here is a example that shows the problem (sorry it's a bit long):
aspx file:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Enabled="true" Interval="1000" />
<asp:Label ID="Label1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>Updating...</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:Timer ID="Timer2" runat="server" OnTick="Timer2_Tick" Enabled="true" Interval="2000" />
<asp:Label ID="Label2" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress2" runat="server" AssociatedUpdatePanelID="UpdatePanel2">
<ProgressTemplate>Updating...</ProgressTemplate>
</asp:UpdateProgress>
codebehind:
protected void Timer1_Tick(object sender, EventArgs e) {
System.Threading.Thread.Sleep(1000);
Timer1.Enabled = false;
Label1.Text = DateTime.Now.ToString("HH:mm:ss");
}
protected void Timer2_Tick(object sender, EventArgs e) {
System.Threading.Thread.Sleep(1000);
Timer2.Enabled = false;
Label2.Text = DateTime.Now.ToString("HH:mm:ss");
}

I just discovered that everything works as expected if I put the UpdateProgress before the corresponding UpdatePanel...
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>Updating...</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Enabled="true" Interval="1000" />
<asp:Label ID="Label1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>

Ajax timer not polling when another request is being served

In my form there there is a "Submit Button" and another Timer... Submit button submits a request that may take few minutes to serve..Mean while the timer would poll at short intervals (say 5 secs ) and keep the user updated.. But the issue is that timer stops polling as soon as the Submit button is clicked.. I am attaching the working sample code of the application..Does anyone know why this is happening..Thanks in advance.
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Submit_Click" />
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
<asp:Timer ID="Timer1" Interval="700" runat="server" OnTick="UpdateTimer_Tick">
</asp:Timer>
</form>
</body>
Code Behind
protected void UpdateTimer_Tick(object sender, EventArgs e)
{
Debug.Write("Timer");
Label1.Text = DateTime.Now.ToString();
}
protected void Submit_Click(object sender, EventArgs e)
{
Debug.Write("Submit Start ");
for (int i = 0; i < 1000; i++)
{
Thread.Sleep(100);
}
Debug.Write("Submit End ");
}

I think the timer is stopped on postback (button-click) and will only start again when that postback returns. One solution to this is to use PageMethods instead of the timer, but you can only make static functions a PageMethod. For the example it would work like this:
[WebMethod()] public static string GetTime(){
Return DateTime.Now.ToString();
}
html and javascript (jquery):
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Submit_Click" />
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<script type="text/javascript">
function OnSuccess(result, ctrl) { $('#<%=Label1.ClientID %>').html(result); }
function OnError() { alert("error!"); }
$(document).ready(function() {
setInterval(function() { PageMethods.GetTime(OnSuccess, OnError); }, 700)
});
</script>
</form>
</body>
Don't forget to set EnablePageMethods="true" when using webmethods!
While testing this I noticed the response was slower than the SetTimeout triggering a new ajax call, so the page rapidly builds up running connections, this might be because my development server is a bit slow. To fix this you should not update so frequently, once every 5 seconds will have to do.
I guess the asp.net timer already prevents this behavior: it stops when another ajax call is done. This behavior causes the problem you're experiencing, the button postback blocks the timer updates.

ASP.NET: ModalPopupExtender prevents button click event from firing

Here is what I'm trying to do: Click a button on my page, which in turn makes (2) things happen:
Display a ModalPopup to prevent the user from pressing any buttons or changing values
Call my code behind method, hiding the ModalPopup when finished
Here is the ASP markup:
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
UpdateMode="Always">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="pnlHidden" runat="server" style="display: none;">
<div>
<h1>Saving...</h1>
</div>
</asp:Panel>
<cc1:ModalPopupExtender ID="modalPopup"
BackgroundCssClass="modalBackground" runat="server"
TargetControlID="btnSaveData" PopupControlID="pnlHidden"
BehaviorID="ShowModal">
</cc1:ModalPopupExtender>
<asp:Button ID="btnSaveData" runat="server" Text="Save Data"
OnClick="btnSaveData_Click" />
</ContentTemplate>
</asp:UpdatePanel>
Now, here is my code behind C# code:
protected void btnSaveData_Click(object sender, EventArgs e)
{
UpdateUserData(GetLoggedInUser());
modalPopup.Enabled = false;
}
Why doesn't this work? The ModalPopup displays perfectly, but the btnSaveData_Click event NEVER fires.
UPDATE: The first suggestion did not work for me. I also tried your second suggestion (insofar as it applied to me). One minor difference on my end is that there is no button on my modal panel (pnlHidden) -- it's just a message. I did try using Javascript events on the client side, which at least did fire concurrently with my server-side event. This was good news, but I can't seem to find or grab a handle on the ModalPopupExtender or its BehaviorID. This doesn't work:
function showOverlay() {
var popup = $find('modalPopup');
popup.show();
}
popup is ALWAYS equal to null.
FINAL UPDATE: This is my final solution for getting this to work (Take specific note of the use of OnClientClick AND OnClick):
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
UpdateMode="Always">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="pnlHidden" runat="server" style="display: none;">
<div>
<h1>Saving...</h1>
</div>
</asp:Panel>
<cc1:ModalPopupExtender ID="modalPopup"
BackgroundCssClass="modalBackground" runat="server"
TargetControlID="hdnField" PopupControlID="pnlHidden"
BehaviorID="ShowModal">
<asp:HiddenField ID="hdnField" runat="server" />
</cc1:ModalPopupExtender>
<asp:Button ID="btnSaveData" runat="server" Text="Save Data"
OnClientClick="showModal();" OnClick="btnSaveData_Click" />
</ContentTemplate>
</asp:UpdatePanel>
Using this Javascript function:
function showModal() { $find('ShowModal').show(); }
... And this code behind:
protected void btnSaveData_Click(object sender, EventArgs e)
{
UpdateUserData(GetLoggedInUser());
modalPopup.hide();
}

Try this.
Create a dummy hidden field:
<asp:HiddenField ID="hdnField" runat="server" />
Set the TargetcontrolID = "hdnField" in your Modal Popup declaration.
In your btnSaveData_Click event, do this:
modalPopup.Show();

Try this. It is 100% working
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="Btnshow" runat="server" Text="Show" OnClick="Btnshow_Click" />
<asp:Button ID="BtnTarget" runat="server" Text="Target" Style="display: none" />
<asp:TextBox ID="TextBox1" runat="server">
</asp:TextBox>
<input type="button" value="Get" onclick="abc()" />
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="BtnTarget"
PopupControlID="Panel1">
</asp:ModalPopupExtender>
<asp:Panel ID="Panel1" runat="server" BackColor="Black" Width="300px" Height="300px">
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="BtnHide" runat="server" Text="Hide Button" OnClick="BtnHide_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="BtnHide" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Btnshow" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Server side code
protected void Btnshow_Click(object sender, EventArgs e)
{
ModalPopupExtender1.Show();
}
protected void BtnHide_Click(object sender, EventArgs e)
{
ModalPopupExtender1.Hide();
}

First attempt: Try to set your ButtonID into OkControlID Tag and try again
OR
Second attempt: Call your event over javascript there seems to be some problems with click events
<div>
<cc1:ModalPopupExtender PopupControlID="Panel1"
ID="ModalPopupExtender1"
runat="server" TargetControlID="LinkButton1" OkControlID="Ok"
OnOkScript="__doPostBack('Ok','')">
</cc1:ModalPopupExtender>
<asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>
</div>
<asp:Panel ID="Panel1" runat="server">
<asp:Button ID="Ok" runat="server" Text="Ok" onclick="Ok_Click" />
</asp:Panel>

From this example you can easily control panel show up depends on conditions instead of just immediately show up panel once you click button.
<asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click"/>
<asp:HiddenField ID="hdnField" runat="server" />
<ajaxToolkit:ModalPopupExtender runat="server"
TargetControlID="hdnField"
ID="btnAdd_ModalPopupExtender"
PopupControlID="pnlPrintName">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel ID="pnlPrintName" runat="server">
.
.
</asp:Panel>
//Server side code:
protected void btnAdd_Click(object sender, EventArgs e)
{
if( dt.Rows.Count == 0 )
{
btnAdd_ModalPopupExtender.Show();
}
else
{
add();
}
}

In code behind, you can do this:
if (true)
{
var script = #"Sys.Application.add_load(function() { $find('behavoirIDModal').show(); });";
ScriptManager.RegisterStartupScript(this, GetType(), "Show", script, true);
}
Change this 'behavoirIDModal'