Grouping
21 Feb 20244 minutes to read
The DropDownList supports wrapping nested elements into a group based on different categories. The category of each list item can be mapped through the groupBy field in the data table. The group header is displayed both as inline and fixed headers. The fixed group header content is updated dynamically on scrolling the popup list with its category value.
In the following sample, vegetables are grouped according on its category using groupBy field.
<div id='groupList' class='col-lg-6' style='padding-top:15px'>
<div class='content'>
<ejs-dropdownlist id="vegetables" placeholder="Select a vegetable" popupHeight="200px" dataSource="@ViewBag.data">
<e-dropdownlist-fields groupBy="Category" value="Vegetable"></e-dropdownlist-fields>
</ejs-dropdownlist>
</div>
</div>using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace WebApplication1.Models
{
public class Vegetables
{
public string Vegetable { get; set; }
public string Category { get; set; }
public string Id { get; set; }
public List<Vegetables> VegetablesList()
{
List<Vegetables> veg = new List<Vegetables>();
veg.Add(new Vegetables { Vegetable = "Cabbage", Category= "Leafy and Salad", Id= "item1" });
veg.Add(new Vegetables { Vegetable = "Chickpea", Category= "Beans", Id= "item2" });
veg.Add(new Vegetables { Vegetable = "Garlic", Category= "Bulb and Stem", Id= "item3" });
veg.Add(new Vegetables { Vegetable = "Green bean", Category= "Beans", Id= "item4" });
veg.Add(new Vegetables { Vegetable = "Horse gram", Category= "Beans", Id= "item5" });
veg.Add(new Vegetables { Vegetable = "Nopal", Category= "Bulb and Stem", Id= "item6" });
veg.Add(new Vegetables { Vegetable = "Onion", Category= "Bulb and Stem", Id= "item7" });
veg.Add(new Vegetables { Vegetable = "Pumpkins", Category= "Leafy and Salad", Id= "item8" });
veg.Add(new Vegetables { Vegetable = "Spinach", Category= "Leafy and Salad", Id= "item9" });
veg.Add(new Vegetables { Vegetable = "Wheat grass", Category= "Leafy and Salad", Id= "item10" });
veg.Add(new Vegetables { Vegetable = "Yarrow", Category = "Leafy and Salad", Id = "item11" });
return veg;
}
}
}Customization
The grouping header is also provided with customization option. This allows custom designing using the groupTemplate property for both inline and fixed headers as referred here: