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Templates

The ComboBox has been provided with several options to customize each list item, group title, selected value, header, and footer elements. It uses the Essential JS 2 Template engine to compile and render the elements properly.

Item template

The content of each list item within the ComboBox can be customized with the help of itemTemplate property.

In the following sample, each list item is split into two columns to display relevant data’s.

tagHelper
itemtemplate.cs
<div id='remote-data' class='col-lg-6' style='padding-top:15px'>
    <div class='content'>
        <ejs-combobox id="customers" placeholder="Select a customer" popupHeight="200px" query="new ej.data.Query().from('Employees').select('EmployeeID','FirstName','Title').take(10)" itemTemplate="@Html.Raw("<span><span class='name'>${FirstName}</span><span class ='city'>${City}</span></span>")">
            <e-combobox-fields value="CustomerID" text="ContactName"></e-combobox-fields>
            <e-datamanager url="http://services.odata.org/V4/Northwind/Northwind.svc/" adaptor="ODataV4Adaptor" crossDomain="true"></e-datamanager>
        </ejs-combobox>
    </div>
</div>
<style>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  top: 45%;
  left: 45%;
}
.city{
    right: 15px;
    position: absolute;
}
</style>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult Itemtemplate()
        {
            return View();
        }       
    }
}

Group template

The group header title under which appropriate sub-items are categorized can also be customize with the help of groupTemplate property. This template is common for both inline and floating group header template.

In the following sample, employees are grouped according to their city.

tagHelper
grouptemplate.cs
<div class='col-lg-6' style='padding-top:15px'>
    <div class='content'>
        <ejs-combobox id="customers" placeholder="Select a customer" popupHeight="200px" query="new ej.data.Query().from('Employees').select(['FirstName', 'City', 'EmployeeID']).take(5).where(new ej.data.Predicate('City', 'equal','london').or('City','equal','seattle'))"                     groupTemplate="@Html.Raw("<strong>${City}</strong>")">
            <e-combobox-fields groupBy="City" value="EmployeeID" text="FirstName"></e-combobox-fields>
            <e-datamanager url="http://services.odata.org/V4/Northwind/Northwind.svc/" adaptor="ODataV4Adaptor" crossDomain="true"></e-datamanager>
        </ejs-combobox>
    </div>
</div>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult grouptemplate()
        {
            return View();
        }       
    }
}

Header template

The header element is shown statically at the top of the popup list items within the ComboBox, and any custom element can be placed as a header element using the headerTemplate property.

In the following sample, the list items and its headers are designed and displayed as two columns similar to multiple columns of the grid.

tagHelper
headertemplate.cs
<div id='remote-data' class='col-lg-6' style='padding-top:15px'>
    <div class='content'>
        <ejs-combobox id="customers" placeholder="Select a customer" popupHeight="200px" query="new ej.data.Query().from('Employees').select(['FirstName', 'City', 'EmployeeID']).take(6)"
                   headerTemplate="@Html.Raw("<span class='head'><span class='name'>Name</span><span class='city'>City</span></span>")"
                     itemTemplate="@Html.Raw("<span><span class='name'>${FirstName}</span><span class ='city'>${City}</span></span>")">
            <e-combobox-fields value="EmployeeID" text="FirstName"></e-combobox-fields>
            <e-datamanager url="http://services.odata.org/V4/Northwind/Northwind.svc/" adaptor="ODataV4Adaptor" crossDomain="true"></e-datamanager>
        </ejs-combobox>
    </div>
</div>

<style>
#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  top: 45%;
  left: 45%;
}

.head, .item{               
    display: table;
    width:100%;
    margin:auto;				
}
.head{
    height: 40px;
    font-size:15px;
    font-weight:600;
}
.name, .city{
    display: table-cell;
    vertical-align: middle;
    width: 50%;      
}
.head .name {
   text-indent: 16px;
}

.head .city {
   text-indent: 10px;
}
</style>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult headertemplate()
        {
            return View();
        }       
    }
}

The ComboBox has options to show a footer element at the bottom of the list items in the popup list. Here, you can place any custom element as a footer element using the footerTemplate property.

In the following sample, footer element displays the total number of list items present in the ComboBox.

tagHelper
footertemplate.cs
<div class='control-wrapper'>
    <div style='padding-top:75px;'>
        <ejs-combobox id="employees" dataSource="@ViewBag.data" placeholder="Select an employee" popupHeight="270px"
                    footerTemplate="@Html.Raw("<span class='foot'> Total list items: " + 4 + "</span>")">
            <e-combobox-fields text="Name"></e-combobox-fields>
        </ejs-combobox>
    </div>
</div>
<style>
    #container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  top: 45%;
  left: 45%;
}

.foot{
    text-indent: 1.2em;
    display: block;
    font-size: 15px;
    line-height: 40px;
    border-top: 1px solid #e0e0e0;
}
</style>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult footertemplate()
        {
            ViewBag.data = new string[] { "Badminton", "Basketball", "Cricket", "Football", "Golf", "Gymnastics", "Hockey", "Tennis" };
            return View();
        }
    }
}

No records template

The ComboBox is provided with support to custom design the popup list content when no data is found and no matches found on search with the help of noRecordsTemplate property.

In the following sample, popup list content displays the notification of no data available.

tagHelper
norecordstemplate.cs
<div class='control-wrapper'>
    <div style='padding-top:75px;'>
        <ejs-combobox id="employees" dataSource="@ViewBag.data" placeholder="Select an employee" popupHeight="270px"
                     noRecordsTemplate="@Html.Raw("<span class='norecord'> NO DATA AVAILABLE</span>")">
            <e-combobox-fields text="Name"></e-combobox-fields>
        </ejs-combobox>
    </div>
</div>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult norecords()
        {
            ViewBag.data = new string[] { };
            return View();
        }
    }
}

Action failure template

There is also an option to custom design the popup list content when the data fetch request fails at the remote server. This can be achieved using the actionFailureTemplate property.

In the following sample, when the data fetch request fails, the ComboBox displays the notification.

tagHelper
actionfailuretemplate.cs
<div id='remote-data' class='col-lg-6' style='padding-top:15px'>
    <div class='content'>
        <ejs-combobox id="customers" placeholder="Select a customer" popupHeight="200px" query="new ej.data.Query().from('Employees').select(['FirstName', 'City', 'EmployeeID']).take(5)"
                     actionFailureTemplate="@Html.Raw("<span class='action-failure'> Data fetch get fails</span>")">
            <e-combobox-fields groupBy="City" value="EmployeeID" text="FirstName"></e-combobox-fields>
            <e-datamanager url="http://services.odata.org/V4/Northwind/Northwind.svcs/" adaptor="ODataV4Adaptor" crossDomain="true"></e-datamanager>
        </ejs-combobox>
    </div>
</div>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ComboBoxController : Controller
    {
        public IActionResult actionfailure()
        {
            return View();
        }
    }
}