Add to List from codebehind C# Asp.net

I have a UL list in a ASPX page:

<ul id="tabs">
<li id="tab1"><a href="ztab1.htm">Tab 1</a></li>
<li id="tab2"><a href="ztab2.htm">Tab 2</a></li>
<li id="tab3"><a href="ztab3.htm">Tab 3</a></li>
<li id="tab4"><a href="ztab4.htm">Tab 4</a></li>
</ul>

I would like to add list items dynamically from codebehind, including the href entry for each new list item.

How?

Use [asp:bulletedList][1] and your list will be much easier.


<asp:BulletedList id="blTabs"
BulletStyle="Disc"
DisplayMode="LinkButton"
runat="server">
<asp:ListItem Value="ztab1.htm">tab1</asp:ListItem>
<asp:ListItem Value="ztab2.htm">tab2</asp:ListItem>
<asp:ListItem Value="ztab3.htm">tab3</asp:ListItem>
</asp:BulletedList>

Code Behind:

ListItem li = new ListItem();
li.Value = "*.html"; //html goes here i.e. xtab1.html
li.Text = "New Text"; //text name goes i.e. here tab1
blTabs.Items.Add(li);

[1]:

[To see links please register here]

This result is the same as GenericTypeTea's, but the difference is the HTML is 'written' in the code behind and injected into the page.

In your markup:

<asp:Literal id="litMarkup" runat="server" />

In your code behind:

List<string> locations // however this initialized

StringBuilder sb = new StringBuilder();

sb.Append("<ul id=\"tabs\">");

for (int i = 0; i < locations.Count; i++)
{
sb.Append("<li id=\"tab" + i.ToString() + "\"><a href=\"" + locations[i] + "\">Tab " + i.ToString() + "</a></li>");
}

sb.Append("</ul>");

litMarkup.Text = sb.ToString();

You can create a dynamic UL by using an `asp:Repeater` Control

You can use repeater in following way, in your `.aspx` file

<asp:Repeater ID="menu_ul_1" runat="server">
<HeaderTemplate>
<ul class="my-menu">
</HeaderTemplate>
<ItemTemplate>
<li>
<a href='<%# Eval("href_li")%>'>
<%# Eval("DisplayText")%></a>
</li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>
And you can put dynamic data via code behind in `.aspx.cs` file

protected void Page_Load(object sender, EventArgs e)
{
DataTable newsDataTable = new DataTable();

// add some columns to our datatable
newsDataTable.Columns.Add("href_li");
newsDataTable.Columns.Add("DisplayText");

for (int i = 1; i <= 5; i++)
{
DataRow newsDataRow = newsDataTable.NewRow();
newsDataRow["href_li"] = "?sc=item_" + i;
newsDataRow["DisplayText"] = "List Item # "+i;
newsDataTable.Rows.Add(newsDataRow);
}
menu_ul_1.DataSource = newsDataTable;
menu_ul_1.DataBind();
}
**Result:** You will get following html through this code

<ul class="my-menu">
<li><a href='?sc=item_1'>List Item # 1</a> </li>
<li><a href='?sc=item_2'>List Item # 2</a> </li>
<li><a href='?sc=item_3'>List Item # 3</a> </li>
<li><a href='?sc=item_4'>List Item # 4</a> </li>
<li><a href='?sc=item_5'>List Item # 5</a> </li>
</ul>

You need to mark your ul as a server side control, then treat the 'new item' as a `HtmlGenericControl` and insert it into the control collection:

<ul runat="server" id="tabs">

To add the item, create a new element and add it:

HtmlGenericControl li = new HtmlGenericControl("li");
tabs.Controls.Add(li);

HtmlGenericControl anchor = new HtmlGenericControl("a");
anchor.Attributes.Add("href", "page.htm");
anchor.InnerText = "TabX";

li.Controls.Add(anchor);

nested it with parent child,use your elements as below




Dim newLi = New HtmlGenericControl("li")
Dim anchor = New HtmlGenericControl("a")
anchor.Attributes.Add("href", itemrow.Item("reg_url").ToString().Trim())
anchor.InnerText = itemrow.Item("conf_name")
newLi.Controls.Add(anchor)
eventList.Controls.Add(newLi)