[Solved] DropDownList with NULL value (option label)

[Saud Almutairi]

using Telerik.Web.MVC 2011.414.340


trying to have a dropdownlist bound to list and this field is optional

i do it in Html.DropDownList while setting the "optionLabel" parameter

how do i do it in Telerik.DropDownListFor

-i tried setting selected index to -1 but i got the following error

"index" cannot be negative.
Parameter name: index

[Georgi Krustev]

Hello Saud,

 
The DropDownListFor component currently does not support "optionLabel" functionality of the Html.DropDownListFor. Nevertheless you can easily implement it with adding SelectListItem at the first position of the list. Check this code snippet:

<%
        var list = new SelectList(Model.Products, "ProductID", "ProductName").ToList();
        list.Insert(0, new SelectListItem { Text = "Select option...", Value = "-1" });
    %>

    <%= Html.Telerik().DropDownList()
            .Name("DropDownList")
            .SelectedIndex(0)
            .BindTo(list)
    %>

Please note that if you want to use ToList() extension method in the ASPX page, then you will need to register System.Linq namespace in the web.config.

Regards,
Georgi Krustev
the Telerik team

[Saud Almutairi]

works great thanks.