ComboBox / Custom Attributes

RadComboBox provides support for custom attributes. You can specify custom attributes declaratively in the RadComboBoxItem tag or programmatically using the Attributes collection of the RadComboBoxItem. You can also access custom attributes client-side, using the get_attributes collection of the RadComboBoxItem client-side instance.

You can use databinding expressions in the ItemTemplate template of the combobox. Data-binding expressions have the typical ASP.NET format and syntax, i.e.

Example: <%# DataBinder.Eval(Container, "Attributes['ImagePath']") %>

Please note the following:

If you need to use templates and access custom attributes of the items in the templates you should explicitely bind (call the DataBind() method) these items. The RadComboBoxItem class now exposes the DataBind() method. You should call this method for the items, to which you are going to apply templates. Once the item is bound you can access its Attributes. You can also call the DataBind method of the parent combobox object. This will automatically bind all the items.

In RadComboBox, the Container object contains two data objects: - DataItem - the current row of the respective datasource. You can access the column needed using the column name as a second argument. Example:
<%# DataBinder.Eval(Container.DataItem, "Author") %>

- Item - the current item (ComboBoxItem). You can access all properties and custom attributes of the current combobox item.
Example: <%# DataBinder.Eval(Container, "Text") %>