I'm a newbie to ASP.net (vb), and i'm working with the timer controls. I've once again researched the answer to this and done as said (overloading prerender method). My problem is I have a master page which i've added a timer control, in order to update a count down field, on going to the sites index page i keep getting the error : "Script controls may not be registered before PreRender." The timer works well on other pages except the index page.
<form id="fMain" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Timer ID="timer1" runat="server" Interval="1000" OnTick="timer1_tick"></asp:Timer></div>
<div>
<asp:UpdatePanel id="updPnl" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Literal ID="litTimer" runat="server"></asp:Literal>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="timer1" EventName ="tick" />
</Triggers>
</asp:UpdatePanel>
</div>
The Codebehind:
Sub timer1_tick() Handles timer1.Tick
ltr1.text = "test"
End Sub`
Thank you in advance.
This is because you are using Telerik controls and have overridden the OnPreRender method.
You need to add the following to this method:
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
Related
I am working on a C# asp.net web forms project. It has two master pages. I
have an user control which reads data from database,
creates an un-ordered list in html string and populates a placeholder with
it. This user control has to be automatically
refreshed every 2 minutes. I have included this usercontrol on the parent
master page. I have the following code to refresh the
user control, which I have obtained through another stackoverflow answer.
The problem is that the entire master page refreshes, and I am not sure why.
Is there a way to make that only the user control which has the UpdatePanel
refreshes?
Outer Master Page:
<body>
<form id="frmMain" role="form" method="post" runat="server">
<div>
<uc2:PendingOrders runat="server" ID="PendingOrders" />
</div>
<asp:ContentPlaceHolder ID="MainBodyContent" runat="server">
</asp:ContentPlaceHolder>
</form>
</body>
User Control:
<asp:ScriptManager ID="myScriptManager" runat="server"
EnablePartialRendering="True"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode = "Conditional"
runat="server">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="20000"
OnTick="Timer1_Tick"></asp:Timer>
<asp:PlaceHolder runat="server" id="lblMyOrders"></asp:PlaceHolder>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
User Control Code behind:
protected void Timer1_Tick(object sender, EventArgs e)
{
//This method creates the html string with data as an unordered list
and
//populates asp:PlaceHolder inte updatepanel
GetData();
}
UpdatePanel1's Content will be update by Timer1_Tick.
"entire master page refreshes" means master page's Page_Load will be call while Timer1 been trigger?
UpdatePanel always post entire page back server and only render UpdatePanel1's Content.
I had the same problem, but in our project the EnablePartialRendering was set to false on the Master Page, if set to true the whole project breaks.
To fix the problem, I defined another master page without ScriptManager and added the ScriptManager to the page in which I wanted to use UpdatePanels with the EnablePartialRendering attribute set to True.
This fixed the problem.
<asp:ScriptManager ID="myScriptManager" runat="server" EnablePartialRendering="True"></asp:ScriptManager>
As per topic in discussed. I've assigned one Timer1_Tick (AJAx Control) into my web form user control but it is not working right until i've perform "__doPostBack" in client side and it is not be able to perform automatically once the form is loaded.
Code in markup:
<asp:UpdatePanel ID="TimeSheetUpdate" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TimeSheetTimer" EventName="Tick"/>
</Triggers>
<ContentTemplate>
<asp:Timer ID="TimeSheetTimer" Interval="1000" runat="server" OnTick="TimeSheetTimer_Tick" ClientIDMode="Static"></asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
Code Behind:
protected void TimeSheetTimer_Tick(object sender, EventArgs e)
{
File.WriteAllText(#"C:\checkTimesheetcontrol.txt", "");
File.AppendAllText(#"C:\checkTimesheetcontrol.txt", "Check :" + DateTime.Now.Second);
return;
}
I need it to be perform ealier once the control in loaded in page.How Can I do for it?
once the page is loaded if we need to add something on the UI then how we will do it by using callback without loading the whole page again.
You can use UpdatePanel to do this i.e. without refreshing your whole page it can change components of your page.
<asp:UpdatePanel ID="UpdatePanelMain" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="BtnClick" runat="server" OnClick="BtnClick_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="BtnClick" EventName="Click" />
</Triggers>
Now you will get call in code behind whenever "BtnClick" button is clicked. There you can write your code.
protected void BtnClick_Click(object sender, EventArgs e)
{
// Your logic
}
I have a master page "PartialUpdate.Master" and 2 simple content pages "WebForm1.aspx" and "WebForm2.aspx"
WebForm1.aspx/WebForm2.aspx: the content-pages just display their filename
The master page "PartialUpdate.Master" has 2 buttons and a ContentPlaceHolder
in an UpdatePanel. When clicking on a button I want to see the corresponding content-page
Here's what it looks like...
PartialUpdate.Master :
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
Master Page
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional"
runat="server">
<ContentTemplate>
<asp:Button ID="btnForm1" CommandArgument="WebForm1.aspx"
runat="server" Text="Form1" OnClick="ChangeForm_Click" />
<asp:Button ID="btnForm2" CommandArgument="WebForm2.aspx"
runat="server" Text="Form2"
OnClick="ChangeForm_Click" />
<hr />
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnForm1"
EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnForm2"
EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</div>
</form>
</body>
The code behind of PartialUpdate.Master.cs
protected void ChangeForm_Click(object sender, EventArgs e)
{
Button btn = sender as Button;
Response.Redirect(btn.CommandArgument);
}
Problem here is that Response.Redirect() triggers a full-page postback.
I just want the Master to refresh the content located in the 'ContentPlaceHolder' asynchronously (that's why I added the AJAX UpdatePanel)
In other words, I'd like to dynamically change the content-page that the Master is displaying whitout causing a full-page postback.
Is this possible? If so how?
thank you
Chris
You can call with WebRequest in ajax call and write the content you recieve to the page...
But you can`t "knowing" the browser that you want to redirect to another page without post back.
I have a complicated case, so I can't post it.
I have two UpdatePanels with two UserControls inside them, like the following:
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<A:u1 ID="u1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<A:u2 ID="u2" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
In this sample, the PostBack in u1 doesn't effect on u2. but in my code the PostBack in the first UserControl made a PostBack in the second.
What are the expected reasons ??
Thanks for the help.
This is by design: when a partial postback occurs, the whole page is rendered again even if only part of the resulting markup is sent to the client. Thus, both your user controls go through their lifecycles again, even if only u1 is updated.
If you want to detect that case, you can use the IsInAsyncPostBack property:
protected void Page_Load(object sender, EventArgs e)
{
if (ScriptManager.GetCurrent(Page).IsInAsyncPostBack) {
// This is a partial postback.
}
}