Develop Reference

OnLoad method DataList item`s control

I am building a website right now using DataLists and I want to ask a question:
When using OnLoad on specific control in DataList item, the DataList has 5 items, but the function is called only 4 times (does what it needs to do but not on the last item)
C# code:
protected void ibDeleteAlbum_Load(object sender, EventArgs e)
{
foreach (DataListItem item in DataList1.Items)
{
ImageButton btnDelAlbum = item.FindControl("ibDeleteAlbum") as ImageButton;
btnDelAlbum.Visible = true;
}
}
HTML code:
<asp:DataList ID="DataList1" runat="server" RepeatDirection="Horizontal" RepeatColumns="4" >
<ItemTemplate>
<asp:Label ID="lblAlbumID" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Id") %>' Visible="false"></asp:Label>
<asp:ImageButton ID="ibDeleteAlbum" type="image" runat="server" style="position:absolute; margin-right: 1.4vw; margin-top: 2.4vh;" Visible="false" ImageUrl="~/Images/ic_delete.png" OnClick="ibDeleteAlbum_Click" ToolTip="מחיקה" OnLoad="ibDeleteAlbum_Load" />
<asp:ImageButton ID="ibShowAlbums"
runat="server"
class="album"
ImageUrl='<%# DataBinder.Eval(Container.DataItem, "coverPhoto") %>'
CommandName="album"
CommandArgument='<%#DataBinder.Eval(Container.DataItem, "ID") %>'
OnCommand="ibShowAlbums_Command" />
<div class="albumNameShow" runat="server"><%#DataBinder.Eval(Container.DataItem, "albumName") %></div>
</ItemTemplate>
</asp:DataList>
Thanks ahead!

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

How to get radio button checked value in Footer Template DataList?

I"m using DataList. in my FooterTemplate I add a radio button I I want check it. but it always return false.
This is my code
<asp:DataList ID="dlDelivery" OnItemDataBound="dlDelivery_DataBound" RepeatColumns="1" RepeatDirection="Vertical" Width="300" runat="server">
<ItemTemplate>
<asp:RadioButton ID="rdoDel" GroupName="aaa" OnCheckedChanged="rdoOther_Changed" AutoPostBack="true" runat="server" />
<asp:Label ID="lblDel1" Text='<%# Eval("Street") %>' runat="server" /><br />
<asp:Label ID="lblDel2" Text='<%# Eval("Suburb") %>' runat="server" />
<span class="clear" />
</ItemTemplate>
<FooterTemplate>
<asp:RadioButton ID="rdoOther" Text="Other" OnCheckedChanged="rdoOther_Changed" AutoPostBack="true" GroupName="aaa" runat="server" />
a
<br class="clear" />
</FooterTemplate>
</asp:DataList>
I check the rdoOther check like this
RadioButton rdoOther = (RadioButton)dlDelivery.Controls[dlDelivery.Controls.Count - 1].Controls[0].FindControl("rdoOther");
if (rdoOther.Checked = true ) // this always fales
{
}
How to fix it?

Try this
foreach (DataListItem item in dlDelivery.Items)
{
if (item.ItemType == ListItemType.Footer)
{
RadioButton rdoOther = (RadioButton)item.FindControl("rdoOther");
}
}

Simply search the radio button in e.Item:
protected void dlDelivery_DataBound(object sender, DataListItemEventArgs e)
{
RadioButton rdoOther = e.Item.FindControl("rdoOther") as RadioButton;
//rdoOther will be null if ListItemType is not footer.
if (rdoOther !=null && rdoOther.Checked)
{
// Do your tasks
}
}

Acessing a datacontrol from a listview in asp.net c

I''ve been working at this for a good while now. I'm simply trying to access something that is in a datalist. I can get items just fine from the PageLoad, even set some dynamic items.. but I can't acess controls from my button click handler.
I've tried other variations such as
ListView1.FindControl("DropDownList1") as DropDownList;
Which gives a NULL.
I've tried
<asp:LinkButton id="addPro" runat="server" CommandArgument='<%# DropDownList1.SelectedItem.Text %>' onCommand ="addPro_Click">Add To Cart</asp:LinkButton>
Which says it can't find the data control in scope.
<asp:ListView ID="ListView1" runat="server"
DataKeyNames="Expr7,Expr1,productNo" DataSourceID="SqlDataSource1">
<AlternatingItemTemplate>
<span style="">
<asp:Label ID="productNameLabel" runat="server"
Text='<%# Eval("productName") %>' />
<br />
<asp:Image runat="server" height = "300" ImageUrl='<%# Eval("img") %>'></asp:Image>
<br />
Description:<br />
<asp:Label ID="itemNotesLabel" runat="server" Text='<%# Eval("itemNotes") %>' />
<br />
stock:
<asp:Label ID="stockLabel" runat="server" Text='<%# Eval("stock") %>' />
<br />
price:
<asp:Label ID="priceLabel" runat="server" Text='<%# "$"+ Eval("price")+".00" %>' />
<br />
Quantitiy: <asp:DropDownList id="DropDownList1" runat="server"> </asp:DropDownList>
<br />
<asp:LinkButton id="addPro" runat="server" CommandArgument='<%# Eval("productNo") %>' onCommand ="addPro_Click">Add To Cart</asp:LinkButton>
<br /><br /><br />
<br /></span>
</AlternatingItemTemplate>
On click
protected void addPro_Click(Object sender, CommandEventArgs e)
{
string addr = "";
string v = Request.QueryString["cat"];
if (v != null)
{
v = "cat=" + v+"&";
}
else
{
v = "";
}
DropDownList stockDD = (DropDownList) FindControl("DropDownList1");
if (stockDD != null)
addr = "~/product.aspx/?" + v + "add=" + e.CommandArgument.ToString() + "&quant=" + stockDD.SelectedItem.Text;
else
addr = "ERROR!";
Response.Redirect(addr+e.CommandArgument.ToString());
ListView1.ItemDataBound += (sa, ea) =>
{
DropDownList stockD = ea.Item.FindControl("DropDownList1") as DropDownList;
Label l = ea.Item.FindControl("Lable12") as Label;
l.Text = stockD.SelectedItem.Text;
addr = "~/product.aspx/?" + v + "add=" + e.CommandArgument.ToString() + "&quant=" + stockD.SelectedItem;
};
// Response.Redirect(addr);
}
Any help in the right direction will help a ton! Thanks!

Try this:
LinkButton lbSender = (LinkButton)sender;
ListViewDataItem lvItem = (ListViewDataItem)(lbSender.Parent);
DropDownList DropDownList1 = lvItem.FindControl("DropDownList1");
ListView.Items is a collection of ListViewDataItem which inherits ListViewItem, which inherits from Control. This means you can find any control in its Controls collection using FindControl. You just have to look at the heirarchy.
Docs for ListView: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listview.aspx
Docs for ListViewDataItem: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listviewdataitem.aspx
Docs for ListViewItem: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listviewitem.aspx
Docs for Control: http://msdn.microsoft.com/en-us/library/system.web.ui.control.aspx

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 ...