I have a GridView that is bound to a SQL Data source. I have put this inside an Update panel and want the contents to update at a specified interval. The problem is that if i change the data in the database, the GridView does not update itself, i have to manually refresh the page to view the new data.
What else do I need to do to get a GridView to refresh itself?
<asp:Timer ID="RefreshTimer" runat="server" Interval="10000"
ontick="RefreshTimer_Tick">
</asp:Timer>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div id="quad1"><uc1:MyWidget ID="MyWidget1" runat="server" /></div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="RefreshTimer" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
You have to call gridView.DataBind() on tick event
Use a Timer like this:
<asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="30000">
Follow this Auto-refresh update panel sample and should have no problem. Let me know if you do.
Related
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.
How I can change label(lblSaved), when UpdateProgress is running?My label update after UpdateProgress. I need, when UpdateProgress is starting run to do label(lblSaved) visible false.
<asp:UpdateProgress ID="uprogAutoSave" AssociatedUpdatePanelID="upnlAutoSave" runat="server">
<ProgressTemplate>
<asp:Literal runat="server" Text="<%$ Resources:AutoSave %>" /></ProgressTemplate>
</asp:UpdateProgress>
...
<asp:UpdatePanel ID="UpdatePanel1" RenderMode="Inline" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TimerAutoSave" />
</Triggers>
<ContentTemplate>
<asp:Label ID="lblSaved" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
You have to handel Ajax event from client-side using JavaScript or jQuery.
You have to handle two Ajax event at client side.
OnRequestStart
OnResponseEnd
The first method call at same time your Ajax request start and the second one called when your ajax request become in complete state.
In this methods you have to handle your label, and this all is JavaScript/jQuery so I assume that you will not get any problem to manage the label.
I'm trying to use some AJAX and ASP.Net together to enable me to run functions without having to refresh the whole page but i've stumbled across a problem in doing this
Here's my code
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddl1" runat="server" OnSelectedIndexChanged="update1" />
<asp:TextBox runat="server" ID="txt1" />
</ContentTemplate>
</asp:UpdatePanel>
And here's my code behind
Sub update1(ByVal sender As Object, ByVal e As EventArgs)
txt1.Text = Now.ToString
End Sub
The event doesn't fire because I don't have AutoPostBack="True" on my ddl but adding that to the ddl will postback the whole page.
Is there a way to avoid using AutoPostBack="True" so that it only updates the panel?
I know I can use an asp:Button to get around this but i'd really like to be able to use a ddl with OnSelectedIndexChanged
Thanks
If you want to avoid to send the whole viewstate to the server, you should look at callbacks.
Instead, if you want to avoid a refresh of the entire page, but with postback, this should work:
<asp:DropDownList ID="ddl1" runat="server" OnSelectedIndexChanged="update1" AutoPostBack="True" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostbackTrigger ControlID="ddl1" EventName="SelectedIndexChanged" />
</Triggers>
<ContentTemplate>
<asp:TextBox runat="server" ID="txt1" />
</ContentTemplate>
</asp:UpdatePanel>
Try creating a new page with same codes and different page name. Worked for me
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
<asp:ScriptManager ID="ScriptManager1" runat="server"/>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="chkStaySignedIn" EventName="Checked" />
</Triggers>
<ContentTemplate>
<asp:Label ID="lblPassword" runat="server" Text="Password" AssociatedControlID="txtPassword"/>
</ContentTemplate>
</asp:UpdatePanel>
EventName="Checked"
Can anyone provide me a link to complete list of event names while using ajax.
The checkbox's event name is CheckedChanged
It isn't a definitive list by any means, but this MSDN page lists the default event names for common controls that post back.