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?
Related
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'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);
I'm setting UpdatePanel1.UpdateMode = UpdatePanelUpdateMode.Conditional; to make manual updates but it doesn't work for some custom events, when I have some event alike here:
protected void Button1_Click(object sender, EventArgs e) {
discovery.FindAlreadyRegisteredServices();
discovery.discoveryClient.FindCompleted += FoundEvent;
protected void FoundEvent(object sender, FindCompletedEventArgs e) {
Label1.Text = (discovery.endpoints.Count > 0) ? discovery.endpoints[0].Address.ToString() : "nothing";
UpdatePanel1.Update();
}
My project is failing with:
An unhandled exception of type 'System.InvalidOperationException' occurred in System.ServiceModel.Internals.dll
Additional information: The Update method can only be called on UpdatePanel with ID 'UpdatePanel1' before Render.
even if I set ChildrenAsTriggers or not. Error message is not clear for me and I can't understand what should I do to process update right after I process my event?
addition:
aspx:
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>
<asp:ListView ID="ListView1" runat="server">
</asp:ListView>
</ContentTemplate>
</asp:UpdatePanel>
I suppose you should change your markup like this
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
....
You should set UpdateMode="Conditional" in your markup itself
protected void Button1_Click(object sender, EventArgs e) {
discovery.FindAlreadyRegisteredServices();
discovery.discoveryClient.FindCompleted += FoundEvent;
// Try to call the update method after calling the custom even but in the click event of the button. Ensure you update the Trigger accordingly in the update panel
**UpdatePanel1.Update();**
}
protected void FoundEvent(object sender, FindCompletedEventArgs e) {
Label1.Text = (discovery.endpoints.Count > 0) ? discovery.endpoints[0].Address.ToString() : "nothing";
}
Try to add AsyncPostBackTrigger to the update panel with update mode as conditional
Although you are doing same thing explicitly.
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
</Triggers>
Just to check if there is any other issue, you can set the updateMode property of the update panel to "Always"
hello every one my problem goes like this
i have two updatepannels
<asp:UpdatePanel ID="new_word_panel_UpdatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate >
<asp:Panel ID='new_word_panel' runat="server">
<asp:Button ID='new_word_btn' runat="server" Text='give me a new word' Visible='false' OnClick='GenNewWord' />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" >
<ContentTemplate >
<asp:Button ID='Button8' runat="server" Text='hide' OnClick='hidegive' />
</ContentTemplate>
</asp:UpdatePanel>
the first updatepanel UpdateMode is set to Conditional so i can
update is content from the second updatepanel asp:Button ID='Button8' OnClick='hidegive'
event easily by using the Update() method.
this is the eventhandler:
protected void hidegive(object sender, EventArgs e)
{
if (new_word_btn.Visible == true)
new_word_btn.Visible = false;
else
new_word_btn.Visible = true;
**new_word_panel_UpdatePanel.Update();**
}
my problem is that i cant update the first UpdatePanel from reguler method on my page
although i am using the Update() method, i have try to update panel from this
method and nothing hapeens:
void PlayerWinEventHandler(object sender,Game.PlayerWinEventArgs e)
{
Session["score"] = int.Parse(Session["score"].ToString()) + 10;
UpdateScore();
if (new_word_btn.Visible == true)
new_word_btn.Visible = false;
else
new_word_btn.Visible = true;
new_word_btn.Text = "zibi";
**new_word_panel_UpdatePanel.Update();**
}
thanks for your help...
Why dont you use Triggers in your first update panel.
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button8" EventName="Click"/>
</Triggers>
Situation-->
there are two ajax controls used....
The first one
acts as a prompter, that is, the person types say a letter l in the textbox, and the options starting with l are diplayed for the user to click and select.
The second ajax control
also acts a prompter, that is, when you type a letter l in the second textbox, it displays al the options, but only restricted to the options available WITHIN the option selected in the first text box.
I want to convert the second ajax control into a drop down, that is, all the options should appear restricted to the options available WITHIN the option selected in the first text box, but as a drop down list, not a prompter. How can this be achieved?
I would place each of the 2 DropDownLists in their own individual UpdatePanels, and have the initial TextBox outside:
<asp:TextBox ID="tbLetterChoice" MaxLength="1" runat="server" AutoPostBack="true" OnTextChanged="ShowDropDown1Options" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="tbLetterChoice" EventName="TextChanged" />
</Triggers>
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ShowDropDown2Options" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="DropDownList1" />
</Triggers>
<ContentTemplate>
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DoSomething" />
</ContentTemplate>
</asp:UpdatePanel>
there would need to be two small methods in the codebehind to populate the DropDownLists:
protected void ShowDropDown1Options(object sender, EventArgs e){
DropDownList1.Items.Clear();
// populate DropDownList1 based on tbLetterChoice.Text
}
protected void ShowDropDown2Options(object sender, EventArgs e){
DropDownList2.Items.Clear();
// populate DropDownList2 based on DropDownList1.SelectedValue
}
protected void DoSomething(object sender, EventArgs e){
// take action based on final choice from DropDownList2
}
So, user types a letter into 'tbLetterChoiceand' hits enter. This updates 'DropDownList1'. User chooses item from 'DropDownList1', and this populates 'DropDownList2'. User chooses item from 'DropDownList2', and program executes 'DoSomething()'.