Develop Reference

How to get Textbox from <ItemTemplate> in Repeater ASP Net

I have a product catalog page. When you click on the "Add Product" button, page with a cart shows up. This page has a table with an ItemTemplate inside it. Is there any way to get the value from the textBox located inside that ItemTemplate and change the value in the column Total cost in the table by clicking the button? The main problem is that I cannot access the textBox since it's in the . Thank you.
Catalog page:
Cart page:
CartView.aspx
MasterPageFile="~/Page/Store.Master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="bodyContent" runat="server">
<div id="content" style="margin-left: 7%;">
<style>
#import url("/css/tableCart.css");
#import url("/css/ButtonsCart.css");
</style>
<h2 style="padding: 14px; color:Highlight;">Ваша корзина</h2>
<h3 style="padding: 14px; color:Highlight;">Товары, которые вы добавили в корзину, представлены здесь</h3>
<table id="Table1" V class ="simple-little-table">
<thead>
<tr>
<th></th>
<th>Название</th>
<th>Цвет</th>
<th>Глубина</th>
<th>Ширина</th>
<th>Цена</th>
<th>Количество</th>
<th>Итого</th>
<th></th>
</tr>
</thead>
<tbody>
<asp:Repeater ID="Repeater1" ItemType="Line.Models.CartLine"
SelectMethod="GetCartLines" runat="server" EnableViewState="false">
<ItemTemplate>
<tr>
<td><asp:Image ID="Image1" runat="server" style="height:45px; " ImageUrl=<%# Item.Product.Img %> /></td>
<td> <%# Item.Product.NameProduct %> <%# Item.Product.TypeProducts %></td>
<td><%# Item.Product.Colors %></td>
<td>
Qty: <asp:TextBox ID="txtQty" runat="server" Width="130px" />
<asp:Button ID="cmdUpdate" OnClick="cmdUpdate_Click1" runat="server" Text="Update" CommandName="MyUpdate" CommandArgument = '<%# Container.ItemIndex %>'/>
</td>
<td><%# Item.Size.Depth%></td>
<td><%# Item.Product.Price%></td>
</td>
<td>
<td>
<asp:Label ID="Label2" runat="server" Text="<%# ((Item.Quantity *
Item.Product.Price))%>"></asp:Label>
</td>
<td>
<asp:Label ID="txtAmount" runat="server" Text=""></asp:Label>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</tbody>
<tfoot>
<tr>
<td colspan="3">Итого:</td>
<td colspan="2" ><%= CartTotal.ToString("c") %></td>
</tr>
</tfoot>
</table>
</div>
</asp:Content>
CartView.aspx.cs
using Line.Helpers;
using Line.Models;
using Line.Models.Repository;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Routing;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Line.Page
{
public partial class CartView : System.Web.UI.Page
{
protected void Page_Load(object sender, RepeaterCommandEventArgs e)
{
}
public IEnumerable<CartLine> GetCartLines()
{
return SessionHelper.GetCart(Session).Lines;
}
public decimal CartTotal
{
get
{
return SessionHelper.GetCart(Session).ComputeTotalValue();
}
}
public string CheckoutUrl
{
get
{
return RouteTable.Routes.GetVirtualPath(null, "checkout",
null).VirtualPath;
}
}
public string ReturnUrl
{
get
{
return SessionHelper.Get<string>(Session, SessionKey.RETURN_URL);
}
}
protected void cmdUpdate_Click1(object sender, RepeaterCommandEventArgs e)
{
if (e.CommandName == "MyUpdate")
{
RepeaterItem rRow = Repeater1.Items[Convert.ToInt32(e.CommandArgument)];
TextBox tQty = (TextBox)rRow.FindControl("txtQty");
Label tAmount = (Label)rRow.FindControl("txtAmount");
tAmount.Text = tQty.Text;
}
}
}
}

Ok, so you can set the index of the button, and pick this up in the Repeater "item command"
So, for your button, you can/want say this:
I have qty, price, and amount in the repeater. and button.
So, the markup can look like this:
Qty: <asp:TextBox ID="txtQty" runat="server" Width="130px" />
<br />
Price: <asp:TextBox ID="txtPrice" runat="server" Width="130px" />
<br />
Amount: <asp:TextBox ID="txtAmount" runat="server" Width="130px" />
<br />
<asp:Button ID="cmdUpdate" runat="server" Text="Update"
CommandName="MyUpdate"
CommandArgument = '<%# Container.ItemIndex %>'/>
So, you are now free to enter Qty, amount in any of the repeated items.
I have this:
Now, my repeater is going accross - and I think you should be using a listview since that better supports a grid + columnar layout - but it really don't mater (listview, gridview, repeater - they all work the same).
So, note how in our button we have both command Name, and command argument. In command argument I pass the row of the repeater.
So, the code looks like this:
protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
{
// update button in repeater clicked
// update amount based on qty, and price
if (e.CommandName == "MyUpdate")
{
RepeaterItem rRow = Repeater1.Items(e.CommandArgument);
TextBox tQty = rRow.FindControl("txtQty");
TextBox tPrice = rRow.FindControl("txtPrice");
TextBox tAmount = rRow.FindControl("txtAmount");
tAmount.Text = tQty.Text * tPrice.Text;
}
}
So, just pass the "index" of the repeater row as per above. We used this expression as command argument:
<asp:Button ID="cmdUpdate" runat="server" Text="Update"
CommandName="MyUpdate"
CommandArgument = '<%# Container.ItemIndex %>'/>
So, once you have the Item Index (row index), then you can run code against the one row and change that row as per above.
Edit:
So the full markup I have is this:
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<div style="border-style:solid;color:black;width:250px;float:left">
<div style="padding:5px;text-align:right">
Hotel Name: <asp:TextBox ID="txtHotelName" runat="server" Text ='<%# Eval("HotelName") %>' Width="130px" />
<br />
First Name: <asp:TextBox ID="txtFirst" runat="server" Text ='<%# Eval("FirstName") %>' Width="130px" />
<br />
Last Name: <asp:TextBox ID="txtLast" runat="server" Text ='<%# Eval("LastName") %>' Width="130px" />
<br />
Qty: <asp:TextBox ID="txtQty" runat="server" Width="130px" />
<br />
Price: <asp:TextBox ID="txtPrice" runat="server" Width="130px" />
<br />
Amount: <asp:TextBox ID="txtAmount" runat="server" Width="130px" />
<br />
<asp:Button ID="cmdUpdate" runat="server" Text="Update" CommandName="MyUpdate" CommandArgument = '<%# Container.ItemIndex %>' />
<div>
City : <asp:DropDownList ID="cboCity" runat="server" DataTextField="City"
DataValueField="City" Width="110px">
</asp:DropDownList>
<div style="float:right;text-align:center;margin-left:4px;">
<asp:Button ID="cmdAddCity" runat="server" Text="+" OnClick="cmdAddCity_Click" Height="16px" Width="12px" Font-Size="XX-Small" cssclass="btnPad" OnClientClick="AddCity();return false"/>
</div>
</div>
Active: <asp:CheckBox ID="chkActive" runat="server" Checked = '<%# Eval("Active") %>'/>
</div>
</div>
</ItemTemplate>
</asp:Repeater>
The code to load up this repeater is this:
protected void Page_Load(object sender, System.EventArgs e)
{
if (IsPostBack == false)
LoadGrid();
}
public void LoadGrid()
{
cmdSQL.Connection.Open();
strSQL = "SELECT ID, FirstName, LastName, HotelName, City, Active from tblHotels ORDER BY HotelName";
using (SqlCommand cmdSQL = new SqlCommand(strSQL, new SqlConnection(My.Settings.TEST3)))
{
cmdSQL.Connection.Open();
rstTable.Load(cmdSQL.ExecuteReader);
Repeater1.DataSource = rstTable;
Repeater1.DataBind();
}
}
so the above fills out the repeater - as noted, for a grid like layout, I would use a listview. Drag a list view into a web page.
use the wizards to connect to the database. Now blow out all the templates, only leave the itemtemplate.
Your code to load up the grid - same as above.
now, in place of the repeater as per previous screen shots?
You get this:
So your multiple lines that your building? They should be based on and around a listview. And each row can thus be grabbed, and addressed just as I did per above.
Do a google for listview examples - there is a like a billion examples.
Once you have this setup, then each row is a "thing" that repeats for you automatic based on the data from the table.
The markup for the list view - it again quite much follows the same ideas and concepts as a repeator. the listview for above looks like this:
<asp:ListView ID="ListView1" runat="server" DataKeyNames="ID">
<ItemTemplate>
<tr style="">
<td><asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' /></td>
<td><asp:Label ID="FirstNameLabel" runat="server" Text='<%# Eval("FirstName") %>' /></td>
<td><asp:Label ID="LastNameLabel" runat="server" Text='<%# Eval("LastName") %>' /></td>
<td><asp:Label ID="HotelNameLabel" runat="server" Text='<%# Eval("HotelName") %>' /></td>
<td><asp:Label ID="CityLabel" runat="server" Text='<%# Eval("City") %>' /></td>
<td><asp:CheckBox ID="ActiveCheckBox" runat="server" Checked='<%# Eval("Active") %>' Enabled="false" /></td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table id="itemPlaceholderContainer" runat="server" border="0" style="">
<tr runat="server" style="">
<th runat="server">ID</th>
<th runat="server">FirstName</th>
<th runat="server">LastName</th>
<th runat="server">HotelName</th>
<th runat="server">City</th>
<th runat="server">Active</th>
</tr>
<tr id="itemPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server" style=""></td>
</tr>
</table>
</LayoutTemplate>
</asp:ListView>

ASP.NET (C#) - ListView

In past, i worked on ListViews (.net 2.0) using a custom Template field but what i am trying to achieve here is the following
I am now working on .net 4.6
So basically a list which shows items like above and on mouse-hover few options show up as shown in the following screenshot
I also have to trigger those option to do different things -
How can I do that in asp.net, may I please have some code references.
Cheers
P.S.
This is a rough example of how i am creating the List Item Template (as requested)
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1">
<AlternatingItemTemplate>
<table >
<tr>
<td ><asp:Image ID="image1" ImageUrl='<%# Bind("url") %>' runat="server" Width="98px" /> </td>
<td><h2><asp:Label ID="_label" runat="server" Text ='<%# Bind("title") %>'></asp:Label></h2><asp:Label ID="Label1" runat="server" Text ='<%# Bind("description") %>'></asp:Label></td>
</tr>
</table>
</AlternatingItemTemplate>
<EmptyDataTemplate>
No data was returned.
</EmptyDataTemplate>
<ItemSeparatorTemplate>
<br />
</ItemSeparatorTemplate>
<ItemTemplate>
<table >
<tr>
<td ><asp:Image ID="image1" ImageUrl='<%# Bind("url") %>' runat="server" Width="98px" /> </td>
<td><h2><asp:Label ID="_label" runat="server" Text ='<%# Bind("title") %>'></asp:Label></h2><asp:Label ID="Label1" runat="server" Text ='<%# Bind("description") %>'></asp:Label></td>
</tr>
</table>
</ItemTemplate>
<LayoutTemplate>
<ul id="itemPlaceholderContainer" runat="server" style="">
<li runat="server" id="itemPlaceholder" />
</ul>
<div style="">
</div>
</LayoutTemplate>
</asp:ListView>
I can add any html formatting to this template e,g i can add ASP:button etc but i don't know how to trigger those to perform certain tasks.

One easy way to achieve your requirement is to keep those buttons there but invisible and show them up when the parent container is hovered. following as a quick sample
aspx
<asp:ListView ID="ListView1" runat="server">
<ItemTemplate>
<tr class="row-data">
<td>
<asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>' />
</td>
<td>
<asp:Label ID="PositionLabel" runat="server" Text='<%# Eval("Position") %>' />
</td>
<td>
<div class="btn-area">
<asp:Button runat="server" Text="Button1" />
<asp:Button runat="server" Text="Button2" />
</div>
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table id="itemPlaceholderContainer" runat="server" border="0" style="">
<tr runat="server" style="">
<th runat="server">
Name
</th>
<th runat="server">
Position
</th>
<th>
</th>
</tr>
<tr id="itemPlaceholder" runat="server">
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
css
.btn-area
{
display: none;
}
.row-data:hover .btn-area
{
display: block;
}
code-behind
protected void Page_Load(object sender, EventArgs e)
{
ListView1.DataSource = new List<dynamic>() {
new { Name = "Andy", Position = "PG"},
new { Name = "Bill", Position = "SD"},
new { Name = "Caroline", Position = "Manager"}
};
ListView1.DataBind();
}
UPDATE
ListView ItemCommand can capture the postback by button pressed and CommandName makes you able to recognize which button fired it.
<asp:Button runat="server" Text="Button1" CommandName="c1" />
<asp:Button runat="server" Text="Button2" CommandName="c2" />
code-behind
protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
{
if (e.CommandName == "c1")
{
// do something when button1 pressed
}
else if (e.CommandName == "c1")
{
// do something when button2 pressed
}
}

How to set the visibility of a control in ASP.NET inside the DataList control?

I've got two asp:ImageButton. I want to hide asp:ImageButton ID="ReceiveButton" on each table cell, only if
"<%#Eval("StatusID")=="123" %> " something like this
I do not know how to write this conditional statement in .ASPX file. My code is something like this.
<td>
<%#Eval("StatusID")%>
</td>
<td align="center">
<asp:ImageButton ID="ReceiveButton" ToolTip="Receive/process this aproved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/receive.png"
CommandName="CommandReceived" />
<asp:ImageButton ID="DetailButton" ToolTip="View Approved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/view.png" CommandName="PODetails" />
</td>
I tried something like,
<td>
<%#Eval("StatusID")%>
</td>
<td align="center">
<%if (Eval("StatusID") == "123") { %>
<asp:ImageButton ID="ReceiveButton" ToolTip="Receive/process this aproved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/receive.png"
CommandName="CommandReceived" />
<%} %>
<asp:ImageButton ID="DetailButton" ToolTip="View Approved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/view.png" CommandName="PODetails" />
</td>
But it doesn't work. How to set properly the condition? Please help me.

You can use Item ItemDataBound event of DataList
protected void DatalistID_ItemDataBound(object sender, DataListItemEventArgs e)
{
HiddenField hfStatusID= e.Item.FindControl("hfStatusID") as HiddenField;
ImageButton ReceiveButton= e.Item.FindControl("ReceiveButton") as ImageButton;
if (hfStatusID!= null && ReceiveButton!=null)
{
if (hfStatusID.Value == "123") // As per your Requirement
{
ReceiveButton.Visible= false;
}
}
}
And Take a HiddenField on .aspx page as:
<asp:HiddenField ID="hfStatusID" runat="server" Value='<%#Eval("StatusID")%>'/>

Try this:
Just Add Visible='<%# Eval("StatusID").ToString().Trim()=="123" %>' to your control ReceiveButton Property.
<td>
<%#Eval("StatusID")%>
</td>
<td align="center">
<asp:ImageButton ID="ReceiveButton" ToolTip="Receive/process this aproved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/receive.png"
CommandName="CommandReceived" Visible='<%# Eval("StatusID").ToString().Trim()=="123" %>' />
<asp:ImageButton ID="DetailButton" ToolTip="View Approved PO" runat="server"
ImageUrl="~/DesktopModules/HBI_PurchaseOrder/Assets/Images/view.png" CommandName="PODetails" />
</td>

why is my page passing a blank value for my textBox

I asked this question last night but it was not very well written so I am going to ask it again. I am creating a simple calculator using ASP.NET and c# as my code behind. I am currently just trying to test and make sure that my code behind is getting the value typed entered into the textbox by the user. I put in a if statement that assigns the textbox a value of mehhh if the string it gets passed it empty. My text box displays mehhh so I knoe it is getting an empty string but i am not sure why? here is a link to the site... http://scort323.csweb.kutztown.edu/Calc.aspx Below is my code for the code behind part of my page:
public partial class Assign2_Calc : System.Web.UI.Page
{
protected void ButtonEqual_Click(object sender, EventArgs e)
{
string inputStr = inputBox.Text;
if (inputStr == string.Empty)
{
inputBox.Text = "mehhhhhh";
}
else
{
inputBox.Text = inputStr; //result.ToString();
}
}
}
below is my .aspx page:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Calc.aspx.cs"
Inherits="Assign2_Calc" Debug="true" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<link href="CalculatorStyle.css" rel="stylesheet" type="text/css" />
<script>
var maxInputLength = 20;
function checkButtonClick(clickedValue) {
var buttonValue = clickedValue;
var inputStr = document.getElementById('inputBox').value;
if (buttonValue == '<--') {
if (inputStr.length >= 1) {
document.getElementById('inputBox').value = inputStr.substring(0, inputStr.length - 1);
}
}
else if (buttonValue == 'C') {
document.getElementById('inputBox').value = "";
}
else {
if (inputStr.length < maxInputLength) {
document.getElementById('inputBox').value = inputStr + buttonValue;
}
else {
//document.getElementById('msg').innerHTML = "Maxmum length is " + maxInputLength;
}
}
return false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="main" class="main">
<div id="content" class="content">
<h3 id="h3">Simple Calculator</h3>
<div id="calculatorDiv">
<table cellpadding="0" cellspacing="0">
<tr>
<td colspan="4">
<asp:TextBox runat="server" CssClass="inputBox" ReadOnly="true" ViewStateMode="Enabled" ID="inputBox"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="4">
<br />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonNum7" runat="server" Text="7" CssClass="CalcButtons" OnClientClick="return checkButtonClick(7)" />
</td>
<td>
<asp:Button ID="ButtonNum8" runat="server" Text="8" CssClass="CalcButtons" OnClientClick="return checkButtonClick(8)" />
</td>
<td>
<asp:Button ID="ButtonNum9" runat="server" Text="9" CssClass="CalcButtons" OnClientClick="return checkButtonClick(9)" />
</td>
<td>
<asp:Button ID="ButtonDivide" runat="server" Text="/" CssClass="CalcButtons" OnClientClick="return checkButtonClick('/')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonNum4" runat="server" Text="4" CssClass="CalcButtons" OnClientClick="return checkButtonClick(4)" />
</td>
<td>
<asp:Button ID="ButtonNum5" runat="server" Text="5" CssClass="CalcButtons" OnClientClick="return checkButtonClick(5)" />
</td>
<td>
<asp:Button ID="ButtonNum6" runat="server" Text="6" CssClass="CalcButtons" OnClientClick="return checkButtonClick(6)" />
</td>
<td>
<asp:Button ID="ButtonMultiply" runat="server" Text="*" CssClass="CalcButtons" OnClientClick="return checkButtonClick('*')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button1" runat="server" Text="1" CssClass="CalcButtons" OnClientClick="return checkButtonClick(1)" />
</td>
<td>
<asp:Button ID="Button2" runat="server" Text="2" CssClass="CalcButtons" OnClientClick="return checkButtonClick(2)" />
</td>
<td>
<asp:Button ID="Button3" runat="server" Text="3" CssClass="CalcButtons" OnClientClick="return checkButtonClick(3)" />
</td>
<td>
<asp:Button ID="ButtonSubtract" runat="server" Text="-" CssClass="CalcButtons" OnClientClick="return checkButtonClick('-')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonDackspace" runat="server" Text="<--" CssClass="CalcButtons" OnClientClick="return checkButtonClick('<--')" />
</td>
<td>
<asp:Button ID="ButtonNum0" runat="server" Text="0" CssClass="CalcButtons" OnClientClick="return checkButtonClick(0)" />
</td>
<td>
<asp:Button ID="ButtonClear" runat="server" Text="C" CssClass="CalcButtons" OnClientClick="return checkButtonClick('C')" />
</td>
<td>
<asp:Button ID="ButtonAdd" runat="server" Text="+" CssClass="CalcButtons" OnClientClick="return checkButtonClick('+')" />
</td>
</tr>
<tr>
<td colspan="4">
<asp:Button ID="ButtonEqual" runat="server" Text="=" CssClass="CalcButtonEqual" OnClick="ButtonEqual_Click" />
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
</form>
</body>
</html>

Looking at the source of your web page I found that you have disabled your textbox. If a control is disabled it cannot be edited and its content is excluded when the form is submitted. So instead of disabling (remove disable attribute completely) your textbox set it to readonly (readonly = 'true').

MSDN doc on ReadOnly:
The Text value of a TextBox control with the ReadOnly property set to true is sent to the server when a postback occurs, but the server does no processing for a read-only text box. This prevents a malicious user from changing a Text value that is read-only. The value of the Text property is preserved in the view state between postbacks unless modified by server-side code.
You are "manipulating" the value in client script (not in server code - assuming above is all the code). The original value of the TextBox is preserved (empty).
If you test by removing the ReadOnly attribute (or set it to False), your code will work and you will see the effect of the setting...
Hth....
Update:
..how would I need to go about making it so the user cant use the keyboard to enter anything? making it so they must use the buttons
Unless you have/had a reason to use a server-side control for that input field, a standard HTML Input field with readonly should work.
You will then obtain it's value from the standard POST in the Request (at the end of the day, WebForms is still an HTTP POST), instead of ASP.Net controls.
Trivial example:
Instead of server-control:
<asp:TextBox runat="server" CssClass="inputBox" ReadOnly="true" ViewStateMode="Enabled" ID="inputBox"></asp:TextBox>
Use plain html input field:
<input id="inputBox" name="inputBox" readonly type="text" />
The value of the field (html_readonly) can be obtained in the POST Request:
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
string _html = Request["inputBox"]; //here it is
//do whatever...
}
}
Hth...

DefaultButton in Repeater with textbox and button?

I have a repeater, which represents a shoppingbasket. This shopping basket has an "Update quantity" and a "Delete item" button.
When you edit the quantity and click enter, I will need it to use the Update quantity button (unlike now where it uses the delete item button).
In the code I've tried fixing this by adding a "QuantityPanel" with a DefaultButton, but this doesn't solve my issue!
Any ideas?
My code:
<asp:Repeater ID="ProductBasketRepeater" runat="server"
onitemcommand="ProductBasketRepeater_ItemCommand"
onitemdatabound="ProductBasketRepeater_ItemDataBound1">
<ItemTemplate>
<tr class="BasketEntryItem">
<td class="ImageCol">
<asp:Image ID="ProductImageBox" runat="server" Width="50" />
</td>
<td class="NameCol">
<asp:HyperLink ID="ProductNameHyperlink" runat="server"></asp:HyperLink>
</td>
<td class="PriceCol">
<asp:Label ID="PriceLabel" runat="server"></asp:Label>
</td>
<td class="QuanCol">
<asp:Panel ID="QuantityPanel" runat="server" DefaultButton="UpdateQuantityBtn">
<asp:TextBox ID="QuantityBox" runat="server" Width="30px"></asp:TextBox>
<asp:LinkButton ID="UpdateQuantityBtn" runat="server" Text="Opdater" CommandName="UpdateQuantity"></asp:LinkButton>
</asp:Panel>
</td>
<td class="TotalCol">
<asp:Label ID="TotalPriceLabel" runat="server"></asp:Label><br />
<asp:Button ID="DeleteProductBtn" runat="server" Text="Slet" CommandName="Delete" />
</td>
</tr>
</ItemTemplate>
<SeparatorTemplate>
</SeparatorTemplate>
</asp:Repeater>

In case jQuery is unavailable, you can use simple JavaScript to set to set default button for any texbox:
JS Code:
function clickButton(e, buttonid){
var evt = e ? e : window.event;
var bt = document.getElementById(buttonid);
if (bt){
if (evt.keyCode == 13){
bt.click();
return false;
}
}
}
ASPX page or any simple "input" textbox:
<input name="TextBox1" type="text" id="TextBox1" onkeypress="return clickButton(event,'Button1')" />
Code begind C#:
TextBox1.Attributes.Add("onkeypress", "return clickButton(event,'" + Button1.ClientID + "')");
Do you need help with apply this code in repeater ?

Using jQuery, this piece of code will issue a programmatic click when pressing enter in the textbox:
$('input[id$=QuantityBox]').keypress(function(e) {
if (e.keyCode == 13) {
$(this).next('input[id$=UpdateQuantityBtn]').click();
}
});
Note: I saw a bit late you did not requested jquery specifically, but in you do, this should do the trick.