Develop Reference

How to pass value between pages using link button?

I want to pass the facility_id between pages. However, the link button in the data list does not work.
May I know why it does not work and how to make it work?
Thank you in advance.
Here is the code from the .aspx file:
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1" RepeatColumns="2" RepeatDirection="Horizontal" HorizontalAlign="Center" Width="70%" DataKeyField="facility_id" OnItemCommand="DataList1_ItemCommand">
<ItemTemplate>
<asp:Label ID="facility_idLabel" runat="server" Text='<%# Eval("facility_id") %>' Visible="False" />
<table style="width:100%;">
<tr>
<td style="height: 53px; width: 500px; text-align: right;">
<asp:Label ID="Label2" runat="server" CssClass="ClientFacility2ndTitle" Text='<%# Eval("facility_name") %>'></asp:Label>
</td>
<td class="lblLogin" style="height: 53px; width: 220px">
<asp:LinkButton ID="LinkButton1" runat="server" BorderStyle="None" CssClass="Button" CommandName="BookNow">Book Now</asp:LinkButton>
</td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>
</div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:WebConfigcs %>" SelectCommand="SELECT [facility_id], [facility_name] FROM [facility]"></asp:SqlDataSource>
Meanwhile for the code in aspx.cs:
public partial class ClientFacility : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
if(e.CommandName == "BookNow")
{
MessageBox.Show(e.CommandArgument.ToString());
Response.Redirect("EditFacility.aspx?facility_id=" + e.CommandArgument.ToString());
}
}
}

you have a CommandName for the link button, but no commandArugment?
so:
<asp:LinkButton ID="LinkButton1" runat="server"
BorderStyle="None" CssClass="Button"
CommandName="BookNow"
CommandArgument = '<%# Eval("facility_id") %>'
>Book Now</asp:LinkButton>
So to pick up e.CommandArugment, you need to set that in the link button.

ASP.NET List View ImageButton Command Argument

How can I pass '<%# Eval("Url") %>' as a CommandArgument to my
protected void ImageButton_Command(object sender, CommandEventArgs e)
{
var link = (string) e.CommandArgument;
}
method? Whenever I do it like below I receive empty e.CommandArgument.
<ItemTemplate>
<td runat="server" style="background-color: #FFFBD6; color: #333333;">
<asp:ImageButton
ID="Column1Label"
runat="server"
CommandArgument='<%#Eval("Url") %>'
OnCommand="ImageButton_Command"
ImageUrl='<%# Eval("Column1") %>'
Width="300"
Height="300"
CssClass="ListItem"
EnableViewState="False"
CommandName="Sort"></asp:ImageButton>
<br/>
</td>
</ItemTemplate>
Thanks in advance.

It's because of this: EnableViewState="False"
Turn View State back on (delete that line) and it should work.

setting CSS class to selected ASP.NET Listview Item

I have a listview which I want highlight the items on click.
Using the below code, I could set the CSS class. But the foreach loop doesn't clear the css class set before.
<asp:ListView ID="ListView2" runat="server" SelectedIndex="0" onitemcommand="ListView2_ItemCommand">
<ItemTemplate>
<asp:Panel ID="Panel8" runat="server" CssClass="left-listitem-div">
<asp:Image ID="Image1" runat="server" AlternateText="User Icon" ImageUrl='<%# Eval("UserType").ToString() == "AD_USER" ? "Images/icons/ldapuser32px.png" : "Images/icons/user32px.png" %>' CssClass="list-group-icon" />
<asp:Label ID="ListUserID" runat="server" Text ='<%#Eval("UserID") %>' CssClass="list-group-id" style="display:none;" />
<asp:LinkButton ID="ListFullName" runat="server" Text='<%#Eval("FullName") %>' CssClass="list-group-name" CommandName="select" CommandArgument = '<%# Eval("UserID") %>' Font-Underline="False" ForeColor="Black" Width="130" Height="30" />
<asp:Label ID="ListUserName" runat="server" Text='<%#Eval("UserName") %>' CssClass="list-group-username" style="display:none;" />
<asp:Label ID="ListUserType" runat="server" Text='<%#Eval("UserType") %>' CssClass="list-group-usertype" style="display:none;" />
<asp:Label ID="ListUserEnabled" runat="server" Text='<%#Eval("Enabled") %>' CssClass="list-group-enabled" style="display:none;" />
<asp:Label ID="ListUserDescription" runat="server" Text ='<%#Eval("Description") %>' CssClass="list-group-descri" style="display:none;" />
</asp:Panel>
</ItemTemplate>
</asp:ListView>
The Codebehind is below.
I used SelectedItemTemplate, but Listview selectedIndex is not changing.
If I set the selectedIndex on ItemCommand event, Its affecting only at the next postback.
protected void ListView2_ItemCommand(object sender, ListViewCommandEventArgs e)
{
if (e.Item.FindControl("Panel8") != null && e.Item.FindControl("Panel8") is Panel)
{
foreach (ListViewItem li in ListView2.Items)
{
Panel lipp = (Panel)e.Item.FindControl("Panel8");
lipp.CssClass = "left-listitem-div";
}
Panel pp = (Panel)e.Item.FindControl("Panel8");
pp.CssClass = "left-listitem-div selected";
}
}

Ok, don't change the event, because you use commandEventargs.
Just set the SelectIndex of the listview and then change the css for that item.
protected void ListView2_ItemCommand(object sender, ListViewCommandEventArgs e)
{
(sender as ListView).SelectedIndex = e.Item.DataItemIndex;
(e.Item.FindControl("Panel8") as Panel).CssClass += "SelectedCss";
}
In the loop you alwas refer to the currently selected item, that's your problem.
Change the loop to this: --> li
foreach (ListViewItem li in ListView2.Items)
{
Panel lipp = (Panel)li.FindControl("Panel8");
lipp.CssClass = "left-listitem-div";
}

Make repeater row checkable

I have a ASP.NET repeater consists of image and label(wrap inside a div).
I want to make the repeater row work like a checkbox.
<asp:Repeater ID="rpt" runat="server">
<ItemTemplate>
<div class="divItem">
<asp:HiddenField ID="hfIID" runat="server" Value='<%# Eval("ID") %>' />
<asp:Image ID="imgItem" runat="server" ImageUrl='<%# Eval("ImageURL") %>' />
<asp:Label ID="lblName" runat="server" Text='<%# Eval("ItemName") %>'></asp:Label>
</div>
</ItemTemplate>
</asp:Repeater>
For example, the repeater have 10 items.
When a user select item 3 and item 5(similar like a checkbox) and press Save, I need to get the selected Item ID.

you will need to add some client side scripting with jquery.
Here's how to do it:
in your .aspx define repeater as :
<asp:Repeater ID="rpt" runat="server">
<ItemTemplate>
<div class="divItem" id='divItem<%# Eval("ID") %>'>
<asp:HiddenField ID="hfSelected" runat="server" />
<asp:HiddenField ID="hfIID" runat="server" Value='<%# Eval("ID") %>' />
<asp:Image ID="imgItem" runat="server" ImageUrl='<%# Eval("ImageURL") %>' />
<asp:Label ID="lblName" runat="server" Text='<%# Eval("ItemName") %>'></asp:Label>
</div>
</ItemTemplate>
</asp:Repeater>
and then add this javascript:
<script>
$(function () {
$('.divItem').click(function () {
var item = $(this);
item.toggleClass("divItemSelected"); //mark div as selected: set background color, etc...
var selector = "#" + item.attr("id") + " input[type='hidden'][id*='hfSelected']";
var selected = $(selector).val();
if (selected == "true") {
$(selector).val("false");
} else {
$(selector).val("true");
}
});
});
</script>
And then in code-behind on button click, you do this:
protected void OnSaveClick(object sender, EventArgs e)
{
foreach (RepeaterItem item in rpt.Items)
{
HiddenField hfSelected = item.FindControl("hfSelected") as HiddenField;
bool selected = false;
bool.TryParse(hfSelected.Value, out selected);
if (selected)
{
HiddenField hfIID = e.Item.FindControl("hfIID") as HiddenField;
int id = Convert.ToInt32(hfIID.Value);
// do appropriate action as needed.
}
}
}
Hope this helps!
Regards,
Uros

Access to datalist event inside another databound control & finding controls inside nested datalist

I have a DataList inside another DataList. I want to access the child DataList "dlQuestion" events, ItemDataBound event. Also, I'm tring to find the control LableControl "lblQuestion" in the child datalist. How do I do that? Here's the mark-up:
<asp:DataList ID="dlSection" runat="server" Width="100%">
<ItemTemplate>
<div>
<asp:Label ID="lblSection" runat="server" Text='<%# Eval("Section") %>'></asp:Label>
<asp:HiddenField ID="hfSectionId" runat="server" Value='<%# Eval("SectionId") %>' />
</div>
<asp:DataList ID="dlQuestion" runat="server" >
<ItemTemplate>
<asp:Label ID="lblQuestion" runat="server" Text='<%# Eval("Question") %>'></asp:Label></td>
<asp:HiddenField ID="hfQuestionId" runat="server" Value='<%# Eval("QuestionId") %>' />
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:DataList>

You need to handle ItemDataBound event of the dlQuestion DataList and get lblQuestion Label in that event handler:
Markup:
<asp:DataList ID="dlSection" runat="server" Width="100%">
<ItemTemplate>
<div>
<asp:Label ID="lblSection" runat="server" Text='<%# Eval("Section") %>'></asp:Label>
<asp:HiddenField ID="hfSectionId" runat="server" Value='<%# Eval("SectionId") %>' />
</div>
<asp:DataList ID="dlQuestion" runat="server" OnItemDataBound="dlQuestion_ItemDataBound">
<ItemTemplate>
<asp:Label ID="lblQuestion" runat="server" Text='<%# Eval("Question") %>'></asp:Label></td>
<asp:HiddenField ID="hfQuestionId" runat="server" Value='<%# Eval("QuestionId") %>' />
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:DataList>
Code-behind:
protected void dlQuestion_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
var lblQuestion = e.Item.FindControl("lblQuestion") as Label;
if (lblQuestion != null)
{
lblQuestion.ForeColor = Color.Red;
}
}
}

This is one way finding label control in child datalist...
//here I am finding item(DataList) of child Datalist
DataList dlSubChild = (DataList)childItem.FindControl("dlSubChild");
foreach (DataListItem subChildItem in dlSubChild.Items)
{
//here I am finding item(TextBox) of sub child Datalist
TextBox txtName = (TextBox)subChildItem.FindControl("txtName");
//set literal(litName) text
litName.Text = string.Format("{0}{1}", "Welcome ", txtName.Text);
}
i hope it will helps you ...