I have a ASP.NET gridview that shows some entries from the database. The entries need to be updated very frequently (if a modification occurs on the database, it should be reflected in the asp.net website within at most 3seconds).
The solution I am thinking about is to put the gridview inside an update panel and refresh the page every 3 seconds. Is there a better alternative?
By using Timer in the update panel u can perform that update operation.For example ..
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="10000">
</asp:Timer>
</div>
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="UpdatePanel1 not refreshed yet."></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" UpdateMode="Conditional" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label2" runat="server" Text="UpdatePanel2 not refreshed yet."></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</form>
instead of label control u can use gridview.
Related
I am fetching data from DB and assign it to repeater.
When I click on button event it only goes to page load function but not to the required on-click event.
I am confused as to why this is happening.
And when I comment out repeater its working fine. I don't why it's not working with repeater in page load.
Aspx code:
<form runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel runat="server" pdateMode="Conditional" ChildrenAsTriggers="true" >
<asp:Button ID="Button2" runat="server" Text="Next Availabilities"
OnClick="Button2_Click" />
<asp:Repeater id="repeater1" runat="server">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text=""><%# Eval("Time") %></asp:Label>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID ="Button3" EventName ="Click" />
<asp:AsyncPostBackTrigger ControlID ="Button2" EventName ="Click" />
</Triggers>
</asp:UpdatePanel>
</form>
In your UpdatePanel:
Correct pdateMode to UpdateMode
Remove ChildrenAsTriggers="true"
Add starting tag of <ContentTemplate>
Assign id ID="UpdatePanel1"
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Timer ID="Timer1" runat="server" Interval="100" OnTick="Timer1_Tick"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
// my code is here
</ContentTemplate>
</asp:UpdatePane>
above code refresh update panel in the period time.
I use UpdatePanel with large async timeout value:
<asp:ScriptManager ID="ScriptManager1" runat="server" AsyncPostBackTimeout="3600000" />
<asp:UpdatePanel UpdateMode="Conditional" RenderMode="Block" runat="server" ID="UpdatePanel1">
<ContentTemplate>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="RunButton" />
</Triggers>
</asp:UpdatePanel>
It throws 'Sys.WebForms.PageRequestManagerTimeoutException.' instantly.
Setting it to smaller value ie. 1200000 fixes it but why?
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.
I have a ASP timer control which is supposed to run every three minutes. Although I kept the Timer control in an update panel, it is refreshing the whole page every time it runs.
Is there any it only refresh the particular section of the page, not the whole page?
<div>
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" ontick="Timer1_Tick" Interval="300000" >
</asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<asp:Timer runat="server" id="UpdateTimer" interval="200" ontick="function" />
<asp:UpdatePanel runat="server" id="TimedPanel" updatemode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger controlid="UpdateTimer" eventname="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label runat="server" id="label1" />
<asp:TextBox ID="textbox1" runat="server"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" ontick="Timer1_Tick" Interval="300000">
</asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
you need to use UpdatePanel Triggers. Conditional Update Panels with triggers, and msdn source. Updatepanel with Triggers
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<asp:Timer ID="Timer1" runat="server" ontick="Timer1_Tick" Interval="300000"> </asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
Use update panel and add all the control's inside update panel which you don't want to be refreshed or postback by any event