How To Update TextBox using Update panel in asp.net - asp.net

I Have a TextBox outside the UpdatePanel and a Button inside the Updatepanel When i click on the Button it show value in TextBox.
I Have Write Following Code.
<%# Register TagPrefix="AjaxToolKit" Assembly="AjaxControlToolkit"
Namespace="AjaxControlToolkit" %>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePageMethods="true" />
<asp:TextBox ID="TextBox5" runat="server" />
<asp:UpdatePanel runat="server" ID="Up1">
<ContentTemplate>
<asp:Button ID="btn" runat="server" onclick="btn_Click" />
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
----------Code Behind---------
protected void btn_Click(object sender, EventArgs e)
{
TextBox5.Text = "20000";
}

Your textbox value can't be updated untill you put it in an update panel.
<ContentTemplate>
<asp:TextBox ID="TextBox5" runat="server" />
<asp:Button ID="btn" runat="server" onclick="btn_Click" />
</ContentTemplate>
OR, it would be better if you register a trigger of the button and pull your button out from your update, like...
<asp:UpdatePanel runat="server" ID="upnl" UpdateMode="Conditional" >
<ContentTemplate>
<asp:TextBox ID="TextBox5" runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btn" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

Related

Update Pannel Trigger not working

I have this html that contains a UpdatePanel and a Button, I would like update my User Control(that have a UpdatePanel too) when Button click
I get this error: A control with ID 'btnSubmit' could not be found for the trigger in UpdatePanel when page load.
<asp:Content ID="Content1" ContentPlaceHolderID="content" runat="server">
<asp:UpdatePanel runat="server" ID="updatePanelMyUC" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<uc1:myUserControl runat="server" ID="myUserControlID"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="rightcolumn" runat="server">
<asp:ImageButton ID="btnSubmit" ImageUrl="../../Resources/btnSubmit.png" runat="server" OnClick="btnSubmit_Click" />
</asp:Content>
Your btnSubmit is outside the UpdatePanel.
Trigger of the UpdatePanel must be inside the ContentTemplate of the said UpdatePanel.
<asp:Content ID="Content1" ContentPlaceHolderID="content" runat="server">
<asp:UpdatePanel runat="server" ID="updatePanelMyUC" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<uc1:myUserControl runat="server" ID="myUserControlID"/>
<asp:ImageButton ID="btnSubmit" ImageUrl="../../Resources/btnSubmit.png" runat="server" OnClick="btnSubmit_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="rightcolumn" runat="server">
</asp:Content>

ModalPopupExtender only pops up the UpdatePanel once

The ModalPopupExtender wires the btnCancel button to trigger the a popup an UpdatePanel. The UpdatePanel is a cancel confirmation which contains a Yes button and a No button. After clicking the No button, the panel is closed but the btnCancel no longer trigger the popup when being clicked again. The Yes button works and triggers the server side YesButton_Click event. Here is my code. Thanks for your help.
<%# Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" />
<asp:Button ID="btnCancel" Text="Cancel Task" runat="server" ToolTip="Cancel the displayed task and remove it from Tracker" CausesValidation="false" />
<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="btnCancel"
PopupControlID="ConfirmationPanel" BackgroundCssClass="modalBackground" />
<asp:UpdatePanel ID="upd_yes_no" runat="server">
<ContentTemplate>
<asp:Panel ID="ConfirmationPanel" runat="server" CssClass="modalPopup" Style="display: none">
<div class="modalPopup-text">
Are you sure you want to cancel this task?<br />
<br />
<asp:Button ID="YesButton" runat="server" Text="Yes" CommandArgument="Yes" OnClick="YesButton_Click" />
<asp:Button ID="NoButton" runat="server" Text="No" CommandArgument="No" />
</div>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
I'm not 100% positive but it appears that Extender and Extended controls must reside in the same UpdatePanel. So if you move your Cancel button and ModalPopupExtender control inside the UpdatePanel, it should work as expected.
<ajax:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" />
<asp:UpdatePanel ID="upd_yes_no" runat="server">
<ContentTemplate>
<span id="buttons">
<asp:Button ID="btnUndo" Text="Undo Edit" CommandArgument="undo" runat="server"
OnClick="undo" CausesValidation="false" />
<asp:Button ID="btnNewTask" Text="New Task" CommandArgument="newTask" runat="server"
ToolTip="Unchange current and create new task"
OnClick="NewTask" CausesValidation="false" />
<asp:Button ID="btnCancel" Text="Cancel Task" runat="server"
ToolTip="Cancel the displayed task and remove it from Tracker" CausesValidation="false" />
</span>
<ajax:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="btnCancel" PopupControlID="ConfirmationPanel" BackgroundCssClass="modalBackground" />
<asp:Panel ID="ConfirmationPanel" runat="server" CssClass="modalPopup" Style="display: none">
<div class="modalPopup-text">
Are you sure you want to cancel this task?
<br />
<br />
<asp:Button ID="YesButton" runat="server" Text="Yes" CommandArgument="Yes" OnClick="YesButton_Click" />
<asp:Button ID="NoButton" runat="server" Text="No" CommandArgument="No" />
</div>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>

Asp.net custom ajax file uploader

I develop custom file uploader.
<asp:FileUpload runat="server" ID="fuUpload" />
<asp:UpdatePanel runat="server" >
<ContentTemplate>
<asp:Button ID="btnUpload" runat="server" Text="Upload" CausesValidation="false"
OnClick="btnUpload_Click" />
<div>
<asp:Label ID="lblError" runat="server" Visible="false" ForeColor="Red" /></div>
<asp:Repeater ID="rptAttachments" runat="server" OnItemCommand="Uploader_ItemCommand">
<ItemTemplate>
<div>
<a href='<%#GetUrl(....) %>'><%#Eval("Filename") %></a> <b>
<asp:LinkButton ID="lnkDelete" runat="server" Text="Удалить" CommandName="DeleteAttachment" CommandArgument='<%#Eval("FileName") %>' /></b>
</div>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnUpload" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="rptAttachments" EventName="ItemCommand" />
</Triggers>
</asp:UpdatePanel>
protected void btnUpload_Click(object sender, EventArgs e)
{
//fuUpload.HasFile == false
if (fuUpload.HasFile && fuUpload.PostedFile != null
&& fuUpload.PostedFile.ContentLength > 0)
{
}
}
I wonder why fuUpload.HasFile always equls null.
Try these things.
Put <asp:FileUpload runat="server" ID="fuUpload" /> inside UpdatePanel
Set btnUpload trigger like this. <asp:PostBackTrigger ControlID="btnUpload" />

confused about update panel

In my form I have a label and button control.
By default the label is visible. When a user clicks on the button I have made the label to visible false.
For simple button it is working, but when I add an updatePanel to button the event is getting fired but the label is not getting to visible false. Just try this, and please can anybody tell me why this is happening and the solution for this.
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:fileupload ID="Fileupload1" runat="server"></asp:fileupload>
<asp:Label ID="Label1" runat="server" Text="Label" ></asp:Label>
<asp:UpdatePanel ID="up" runat ="server" >
<ContentTemplate >
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write("hello");
Label1.Visible = false;
}
From the looks of it you need to wrap your label within the update panel as well.
Try
<asp:fileupload ID="Fileupload1" runat="server"></asp:fileupload>
<asp:UpdatePanel ID="up" runat ="server" >
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label" ></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
An update panel will update a section of your page. Your label wasn't included within the updatepanel so would never get updated with your new value.
I suggest that you only wrap the label with the UpdatePanel and set the UpdateMode to "Conditional".
<asp:UpdatePanel ID="up" runat ="server" UpdateMode="Coditional" >
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" />
</Triggers>
</asp:UpdatePanel>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
Regards.

update panel not working

i am having two list box which perform add remove item functionality which are controlled by four buttons and o each button click there happen to be post back but i don't want it to be flicker for which i am using update panel like this but it still made post back wats wrong with this explain me this
<asp:UpdatePanel ID="button" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text=">" OnClick="ButtonAdd_Click" Width="50px"/><br />
<asp:Button ID="ButtonRemove" runat="server" Text="<" OnClick="ButtonRemove_Click" Width="50px"/><br />
<asp:Button ID="ButtonAddAll" runat="server" Text =">>>" OnClick="ButtonAddAll_Click" Width="50px"/><br />
<asp:Button ID="ButtonRemoveAll" runat="server" Text ="<<<" OnClick="ButtonRemoveAll_Click" Width="50px"/>
</ContentTemplate>
</asp:UpdatePanel>
I wrote a quick example that does work. You do not need your buttons in the UpdatePanel. You only need the ListBox since they are the only controls being refresh. Setup the Trigger for the UpdatePanel will cause the refreshes to occur without the 'flicker'.
aspx code:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:Button ID="ButtonAdd" runat="server" Text=">" OnClick="ButtonAdd_Click" Width="50px"/><br />
<asp:Button ID="ButtonRemove" runat="server" Text="<" OnClick="ButtonRemove_Click" Width="50px"/><br />
<asp:Button ID="ButtonAddAll" runat="server" Text =">>>" OnClick="ButtonAddAll_Click" Width="50px"/><br />
<asp:Button ID="ButtonRemoveAll" runat="server" Text ="<<<" OnClick="ButtonRemoveAll_Click" Width="50px"/>
<asp:UpdatePanel ID="button" runat="server" UpdateMode="Always">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ButtonAdd" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="ButtonRemove" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="ButtonAddAll" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="ButtonRemoveAll" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:ListBox ID="ListBox1" runat="server"></asp:ListBox>
<asp:ListBox ID="ListBox2" runat="server"></asp:ListBox>
</ContentTemplate>
</asp:UpdatePanel>
</div>
cs (codebehind) code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ListBox1.Items.Add(new ListItem("Test1", "1"));
ListBox1.Items.Add(new ListItem("Test2", "2"));
ListBox1.Items.Add(new ListItem("Test3", "3"));
ListBox1.Items.Add(new ListItem("Test4", "4"));
ListBox1.Items.Add(new ListItem("Test5", "5"));
}
}
protected void ButtonRemove_Click(object sender, EventArgs e)
{
if (ListBox2.SelectedItem != null)
{
ListBox1.Items.Add(ListBox2.SelectedItem);
ListBox2.Items.RemoveAt(ListBox2.SelectedIndex);
ListBox2.ClearSelection();
ListBox1.ClearSelection();
}
}
protected void ButtonAdd_Click(object sender, EventArgs e)
{
if (ListBox1.SelectedItem != null)
{
ListBox2.Items.Add(ListBox1.SelectedItem);
ListBox1.Items.RemoveAt(ListBox1.SelectedIndex);
ListBox1.ClearSelection();
ListBox2.ClearSelection();
}
}
I have tested this and it does work. I only implemented 2 of the Buttons to present a complete example.
Add the asp:ListBox to the ContentTemplate of your asp:UpdatePanel, or add a new asp:UpdatePanel and add it to its ContentTemplate. The control won't be updated using an asynchronous postback if it's not placed within an asp:UpdatePanel.
With the following code snippets the newly added listBox will be updated with new content using an asynchronous postback:
Page.aspx:
<asp:UpdatePanel ID="button" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text=">" OnClick="ButtonAdd_Click" Width="50px" /><br />
<asp:Button ID="ButtonRemove" runat="server" Text="<" OnClick="ButtonRemove_Click"
Width="50px" />
<br />
<asp:Button ID="ButtonAddAll" runat="server" Text=">>>" OnClick="ButtonAddAll_Click"
Width="50px" />
<br />
<asp:Button ID="ButtonRemoveAll" runat="server" Text="<<<" OnClick="ButtonRemoveAll_Click"
Width="50px" />
<asp:ListBox runat="server" ID="listBox"></asp:ListBox>
</ContentTemplate>
</asp:UpdatePanel>
Sample event handler in the code-behind file, Page.aspx.cs:
protected void ButtonAddAll_Click(object sender, EventArgs e)
{
listBox.DataSource = new List<string>() { "Test" };
listBox.DataBind();
}
<asp:UpdatePanel ID="button" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text=">" OnClick="ButtonAdd_Click" Width="50px" /><br />
<asp:Button ID="ButtonRemove" runat="server" Text="<" OnClick="ButtonRemove_Click"
Width="50px" />
<br />
<asp:Button ID="ButtonAddAll" runat="server" Text=">>>" OnClick="ButtonAddAll_Click"
Width="50px" />
<br />
<asp:Button ID="ButtonRemoveAll" runat="server" Text="<<<" OnClick="ButtonRemoveAll_Click"
Width="50px" />
<asp:ListBox runat="server" ID="listBox"></asp:ListBox>
</ContentTemplate>
</asp:UpdatePanel>

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