Optional Display of item template in a repeater based on flag

Question

User483994611 posted

I want to make repeater item template visible optional based on a flag but its throwing error like ..

<ItemTemplate>
<%# if (<%# Eval("flag")%>)
{ %>

<div>

</div

</ItemTemplate>

Please help!!

Answer 1

User-1716253493 posted

Use inline ?: operator in C#

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/conditional-operator

For example

<div style='<%# Eval("flag")=="a" ? "display:none;" : "" %>'>
abcdsefg
</div>

Answer 2

User1400794712 posted

Hi suvo,

According to your description, I have two ideas about it, you can take them as a reference.

1.Set visible value according to flag's value

For example:

<ItemTemplate>
    <input id="ID" runat="server" class="txtFromDate" visible='<%# Eval("flag") =="true"%>' value='<%# Eval("ID") %>' type="text" />
</ItemTemplate>

As you can see in the picture, the second and fourth row disappear.

2. Deal the data in code behind, add the eligible data(for example: flag=true) to a new datatable and bind this datatable to repeater. Then the repeater will only show the data, the falg of which is true.

My demo:

C#

//Raw data
DataTable dt1 = new DataTable();
dt1.Columns.AddRange(new DataColumn[2] { new DataColumn("ID"), new DataColumn("flag") });
dt1.Rows.Add("1", "true");
dt1.Rows.Add("2", "false");
dt1.Rows.Add("3", "true");
dt1.Rows.Add("4", "false");
dt1.Rows.Add("5", "true");
//Add a new datatable to store the eligible data.
DataTable dt2 = new DataTable();
dt2.Columns.AddRange(new DataColumn[1] { new DataColumn("ID") });
//Get the eligible data and add it to dt2
foreach (DataRow data in dt1.Rows)
{
    if (data["flag"].ToString() == "true")
    {
        dt2.Rows.Add(data["ID"]);
    }
}
repeater.DataSource = dt2;
repeater.DataBind();

ASPX:

<asp:Repeater ID="repeater" runat="server">
    <HeaderTemplate>
        <asp:Label ID="txtID" runat="server">ID</asp:Label>
    </HeaderTemplate>
    <ItemTemplate>
        <input id="ID" runat="server" class="txtFromDate" value='<%# Eval("ID") %>' type="text" />
    </ItemTemplate>
</asp:Repeater>

Best Regards,
Daisy