AsyncPostback Trigger - Textbox value not getting sent back - c#

My UpdatePanel
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePageMethods="true"></asp:ScriptManager>
<asp:UpdatePanel ID="up1" UpdateMode="Conditional"
runat="server" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtName"
EventName="TextChanged"/>
</Triggers>
<ContentTemplate>
<asp:TextBox ID="txtName" runat="server"
AutoPostBack="true" OnTextChanged="txtName_TextChanged" />
<asp:TextBox ID="txtPhone" runat="server" AutoPostBack="true" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
Why isn't the value of my textbox (txtName) getting sent back to the server when it loses focus? The async postback happens but no value.


EventName should be EventName="TextChanged".
TextChanged is default for TextBox control, so you don't even need to set it.
AsyncPostBackTrigger.EventName Property
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePageMethods="true"></asp:ScriptManager>
<asp:UpdatePanel ID="up1" UpdateMode="Conditional"
runat="server" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtName"
EventName="TextChanged"/>
</Triggers>
<ContentTemplate>
<asp:TextBox ID="txtName" runat="server"
AutoPostBack="true" OnTextChanged="txtName_TextChanged" />
<asp:TextBox ID="txtPhone" runat="server" AutoPostBack="true" />
</ContentTemplate>
</asp:UpdatePanel>
Code Behind
protected void txtName_TextChanged(object sender, EventArgs e)
{
string name = txtName.Text;
}

Related

ID not found even already declared C# ASP Update Panel Click Trigger

A control with ID 'contactButton' could not be found for the trigger in UpdatePanel 'contactUpdatePanel'.
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
<asp:UpdatePanel ID="contactUpdatePanel" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:ListView ID="contactList" runat="server">
<ItemTemplate>
<asp:Panel runat="server">
<asp:Label ID="contactLabel" runat="server" Text='<%# Bind("Number") %>' ></asp:Label>
<asp:Button OnClick="contactButton_Click" ID="contactButton" runat="server" Text="Assign"/>
</asp:Panel>
</ItemTemplate>
</asp:ListView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="contactButton" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

Just remove this line because Listview and button are not outside the update panel so it will work automatically.
<Triggers>
<asp:AsyncPostBackTrigger ControlID="contactButton" EventName="Click" />
</Triggers>
Your final code
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
<asp:UpdatePanel ID="contactUpdatePanel" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:ListView ID="contactList" runat="server">
<ItemTemplate>
<asp:Panel runat="server">
<asp:Label ID="contactLabel" runat="server" Text='<%# Bind("Number") %>' ></asp:Label>
<asp:Button OnClick="contactButton_Click" ID="contactButton" runat="server" Text="Assign"/>
</asp:Panel>
</ItemTemplate>
</asp:ListView>
</ContentTemplate>
</asp:UpdatePanel>

Update Panel Not working at all

This is my code:
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="txtEmailUser" TextMode="SingleLine" placeholder="Enter Email" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ValidationGroup="Panel1" ErrorMessage="RequiredFieldValidator"
ControlToValidate="txtEmailUser" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="buttonBuy" />
</Triggers>
</asp:UpdatePanel>
</div>
<br />
<asp:Button runat="server" ValidationGroup="Panel1" OnClick="buttonBuy_Click" ID="buttonBuy" width: 200px;"Text="Buy" />
I've tried many ways but still not working.
How can I solve it?

Maintain scroll position asp.net partial rendering with multiple Updatepanels

I cannot maintain the scroll position of my page having Asynchronous partial rendering.
Here is a sample of my aspx page:
<%# Page Language="C#" MasterPageFile="~/Main.master" AutoEventWireup="true" CodeFile="Page.aspx.cs" Inherits="Page_Page" MaintainScrollPositionOnPostback="true"%>
<asp:Content ID="ContentCo" ContentPlaceHolderID="Cph" runat="Server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Interval="1"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer2" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer2" runat="server" OnTick="Timer2_Tick" Interval="1"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer3" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer3" runat="server" OnTick="Timer3_Tick" Interval="1"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel4" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer4" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer4" runat="server" OnTick="Timer4_Tick" Interval="1"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel5" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer5" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer5" runat="server" OnTick="Timer5_Tick" Interval="1"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel6" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer6" EventName="Tick"/>
</Triggers>
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer6" runat="server" OnTick="Timer6_Tick" Interval="1"></asp:Timer>
</asp:Content>
and I add all the controls in aspx.cs for each UpdatePanel like:
var us = LoadControl("~/Controls/Control1.ascx");
this.Controls.Add(us1);
The Asynchronously Partial rendering works, but each time that a control is rendering it goes at the top of the page,
How can i fix that issue?

I think I had the same issue and resolved by overwriting the javascript scrollTo function. I inserted the below in the page
<script type="text/javascript">
window.scrollTo = function () { }
</script>

How to stop UpdatePanel when i click link button from causing whole page postback

How to stop UpdatePanel when I click link button from causing whole page postback?
UpdatePanel code:
<asp:UpdatePanel ID="panel_update" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="comment_sub" runat="server" Text='<%#Eval("review_headline") %>/>
<asp:Repeater ID="repeat" runat="server" OnItemDataBound="repeat_ItemDataBound" >
<HeaderTemplate>
<div class="top_review">
<h3>TOP REVIEWS</h3>
<a class="view_all">View all reviews(<%=top_view%>)</a>
</div>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lblSubject" runat="server" Text='<%#Eval("commented_by") %>' Font-Bold="true" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID ="link1" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID ="link2" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID ="link3" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

Set ChildrenAsTriggers="true" on your UpdatePanel control. closing tag for update panel should be

RadioButton inside Update Panel causing postback

I am putting the following controls inside an update panel so that the whole page does not refresh. When clicking the button, the page does not refresh but when I try to change the radio button, the page refreshes and causes a full postback. Here is my code:
<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager" runat="Server" EnablePartialRendering="true" />
<asp:UpdatePanel ID="updatePanelToggle" runat="server">
<ContentTemplate>
<asp:RadioButton ID="radioOn" AutoPostBack="true" runat="server" GroupName="toggle" Text="On" OnCheckedChanged="radioOn_CheckedChanged" />
<asp:RadioButton ID="radioOff" AutoPostBack="true" runat="server" GroupName="toggle" Text="Off" OnCheckedChanged="radioOff_CheckedChanged" />
<asp:Button ID="testButton" runat="server" OnClick="mybutton_click"/>
</ContentTemplate>
</asp:UpdatePanel>

Depending on your requirement you can control post backs by adding triggers. Use AsyncPostBackTrigger when you want to update only the update panel content. If you need full post back use PostBackTrigger.
<asp:UpdatePanel ID="updatePanelToggle" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButton ID="radioOn" AutoPostBack="true" runat="server" GroupName="toggle" Text="On" OnCheckedChanged="radioOn_CheckedChanged" />
<asp:RadioButton ID="radioOff" AutoPostBack="true" runat="server" GroupName="toggle" Text="Off" OnCheckedChanged="radioOff_CheckedChanged" />
<asp:Button ID="testButton" runat="server" OnClick="mybutton_click"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="radioOn" />
<asp:AsyncPostBackTrigger ControlID="radioOff" />
<asp:PostBackTrigger ControlID="testButton" />
</Triggers>
</asp:UpdatePanel>

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