I want my templated buttons to have an update panel around it, but it messes up my rowindex attribute for the control. I tried to get the parent of the container but it says displayindex is not a property
<ItemTemplate>
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="IBRemove" EventName="click" />
</Triggers>
<ContentTemplate>
<asp:ImageButton ID="IBRemove" runat="server" RowIndex="<%# Contanier.Parent.Displayindex %>" OnClick="IBRemove_Click" />
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
The Link that VDWWD commented worked fine and it makes more sense to wrap the entire gridview in the update panel.
I was looking for this though:
RowIndex="<%# (DirectCast(Container, IDataItemContainer)).DisplayIndex %>"
Related
Consider the following code fragment:
<div>
<asp:Button runat="server" ID="trickyUPTrigger" Text="Tricky Update" />
<div>
<asp:Button runat="server" ID="normalUPTrigger" OnClick="normalUPTrigger_Click" Text="Normal Update" />
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="normalUPTrigger" />
</Triggers>
<ContentTemplate>
<asp:Label runat="server" ID="changeableLabel" Text="Change me"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</div>
Now make the button with ID of trickyUPTrigger as the trigger of the UpdatePanel. Or, devise a mechanism (probably... using javascript?) so that when this button is clicked UpdatePanel updates without full page postback.
If you want to update the UpdatePanel when clicking on trickyUPTrigger, you can add that button to the triggers list:
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="normalUPTrigger" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="trickyUPTrigger" EventName="Click" />
</Triggers>
<ContentTemplate>
...
</ContentTemplate>
</asp:UpdatePanel>
UPDATE
You asked some code examples showing cases with naming containers, a concept that comes into play for databound controls with item templates, like the GridView and the ListView, and for user controls. In the examples below, I use a ListView, where each item is a separate naming container.
If you wanted to trigger an update of your panel from a button in a ListView item template, the trigger would not be found at runtime, and an exception would occur:
<asp:ListView ID="lstView" runat="server">
<ItemTemplate>
<asp:Button ID="anotherTrigger" runat="server" Text="This trigger cannot be found!" OnClick="anotherTrigger_Click" />
</ItemTemplate>
</asp:ListView>
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="anotherTrigger" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
The reverse case (the UpdatePanel in the ListView item template, the trigger button outside of the ListView) does work, according to my tests, which seems to contradict the note that you mention in your comment:
<asp:ListView ID="lstView" runat="server">
<ItemTemplate>
<asp:UpdatePanel runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="anotherTrigger" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</ItemTemplate>
</asp:ListView>
<asp:Button ID="anotherTrigger" runat="server" Text="This trigger works!" OnClick="anotherTrigger_Click" />
Finally, the case where the UpdatePanel and the trigger button are both in the ListView item template also works:
<asp:ListView ID="lstView" runat="server">
<ItemTemplate>
<asp:Button ID="anotherTrigger" runat="server" Text="This trigger works!" OnClick="anotherTrigger_Click" />
<asp:UpdatePanel runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="anotherTrigger" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</ItemTemplate>
</asp:ListView>
You can notice that I set UpdateMode="Conditional" for the panel in this last example. With this setting, the panel is updated only by its own triggers. If the attribute is set to UpdateMode="Always", the panel is updated not only by his own triggers but also by the triggers of the other UpdatePanels in the page. The default value is UpdateMode="Always" (as in your code sample).
I am quite new to learning asp.net, so the question that I am asking may sound quite basic but I still need an answer as I am doing r&d with some of the toipcs.
I have 2 update panels in my page. Each contains a label. There are two buttons on my page, on the click event of the first button the label in the first update panel should get updated. On the click of the second button the label in the second update panel should get updated.
However when I click any of the two buttons both the labels get updated.
In the load event of the page the foll code is written
Label2.Text = DateTime.Now.ToString();
Label3.Text = DateTime.Now.ToString();
The code for both the update panel is as follows:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID= "Button1" EventName="click" />
</Triggers>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button2" EventName="click" />
</Triggers>
</asp:UpdatePanel>
Remove the code from the page_load method and place it in the event of each of the buttons. So for button1 you put the code that updates label1 and for button2 you put the code that updates the label2.
You don't even need the triggers unless you're doing cross panel events. However, you do need to properly set up your script manager and update panels:
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePartialRendering="true"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server"
UpdateMode="Conditional" OnLoad="Panel1_Load">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Button1"/>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server"
UpdateMode="Conditional" OnLoad="Panel2_Load">
<ContentTemplate>
<asp:Button ID="Button2" runat="server" Text="Button2"/>
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
Here you'd put your code in Panel1_Load(){} and Panel2_Load(){}.
Notice the settings: EnablePartialRendering="true"
and: UpdateMode="Conditional"
If you don't want the asp:Button controls on your panels, you'd have to put them somewhere that would block their normal full post-back behavior.
Q:
I have the following case :
Two drop down lists :
The first one for the camp.
The second one for the faculty .
When the user selects from the camp .I fill the faculty ddl according to his selection.
I put my second ddl in an updatepanel so ,this part of the page only posted back.
but i wanna when i select an item from the second ddl(the faculty one), force full post back to the whole page to view an report .
How to do this .
My aspx:
<asp:DropDownList ID="ddl_camp_s" runat="server" Width="200px" AutoPostBack="True"
OnSelectedIndexChanged="ddl_camp_s_SelectedIndexChanged">
</asp:DropDownList>
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddl_fac_s" runat="server" Width="400px" AutoPostBack="True"
OnSelectedIndexChanged="ddl_fac_s_SelectedIndexChanged">
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddl_camp_s"
EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
It would be better using cascadingdropdown from ajax control toolkit
http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/CascadingDropDown/CascadingDropDown.aspx
Try add this in your update panel triggers
<Triggers>
<asp:PostBackTrigger ControlID="ControlIdToForceFullPOstBack" />
</Triggers>
Hope this help
My issues here is that this does not compile. I get "A control with ID 'LinkButtonRemove' could not be found for the trigger in UpdatePanel 'UpdatePanelFiles'."
What I am trying to do is have two buttons in the item template. One that updates just the ITEM and one that updates the entire DataList. "LinkButtonRemove" is what I want to update the entire datalist. Any ideas on why this isnt working? Or how to do what I want to do?
THE SHORT VERSION:
UPDATEPANEL1
-DATALIST
--ITEM
---UPDATEPANEL2
----CONTROLS
I want one control to update the item updatepanel only and the other to update the entire datalist.
<asp:UpdatePanel ID="UpdatePanelFiles" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="LinkButtonRemove" />
</Triggers>
<ContentTemplate>
<asp:DataList ID="DataListFiles" class="MediaManagerDataList" runat="server" ItemStyle-BackColor="#ffffff" AlternatingItemStyle-BackColor="#E7F4FF" OnItemCommand="DataListFiles_ItemCommand">
<ItemTemplate>
<asp:UpdatePanel ID="UpdatePanelItem" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="item">
<asp:LinkButton ID="LinkButtonRemove" CommandName="remove" runat="server">Remove</asp:LinkButton>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:DataList>
</ContentTemplate>
</asp:UpdatePanel>
The updatepanel can't see the button, but it can see the list. You can skip the trigger part and just call updatepanel.update() in your codebehind when you handle the click event.
You can do this by putting the DataList's Id instead of the linkbutton
I have a page and it has a button and a user control.
I want to refresh the user control without refreshing the page.
I know I cannot do it otherwise so what I did is wrapped my user control inside the Update Panel.
<asp:TextBox ID="txtName" runat="server"></asp:TextBox><br />
<asp:Button ID="btnAdd" runat="server" Text="Add name to list" OnClick="btnAdd_Click" /><br /><br />
<asp:UpdatePanel ID="upShowNames" runat="server">
<ContentTemplate>
<uc1:ShowNames ID="ucShowNames" runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnAdd" />
</Triggers>
</asp:UpdatePanel>
But I still the control won't refresh.
I also tried calling the update panels. The Update() method by changing its UpdateMode to Conditional but that does not work either...
Does anyone know how can I do it?
Please change these 2 things
<asp:UpdatePanel ID="upShowNames" runat="server" UpdateMode="Conditional">
<asp:AsyncPostBackTrigger ControlID="btnAdd" EventName="Click"/>
You missed the EventName on the postback trigger, once you add that, it should work :-)