How to add new option if not exist in the list using select2 in MVC

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Actually i had implement the multiple values jquery autocomplete textbox.if the option or item not found in the list i want to add that option to autocomplete box

Autocomplete.cshtml:

Razor

@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Select2 with Ajax</title>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet" />
    <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.10.2/jquery.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
</head>
<body>
    <div class="container">
        <div class="form-group">
            <label for="Select Country">Select Country</label>
            <select multiple="multiple" class="chose-country form-control"></select>
        </div>
    </div>
    <script>
        $(document).ready(function () {
            $(".chose-country").select2({
                ajax: {
                    url: '/Home/GetEmployeeList',
                    width: 'resolve',
                    data: function (params) {
                        return {
                            q: params.term// search term
                        };
                    },
                    processResults: function (data) {
                        return {
                            results: data.items
                        };
                    },
                    minimumInputLength: 2,
                    width: 'resolve'
                }
            });

        });
    </script>
</body>
</html>

Select2Model:

C#

public class Select2Model
   {
       public string id { get; set; }
       public string text { get; set; }
   }

HomeController:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebApplication3.Models;

namespace WebApplication3.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }

        public ActionResult autocomplete()
        {
            return View();
        }
        public ActionResult GetEmployeeList(string q)
        {

            var list = new List<Select2Model>();

            list.Add(new Select2Model()
            {
                text = "India",
                id = "101"
            });
            list.Add(new Select2Model()
            {
                text = "Srilanka",
                id = "102"
            });
            list.Add(new Select2Model()
            {
                text = "Singapore",
                id = "103"
            });

            if (!(string.IsNullOrEmpty(q) || string.IsNullOrWhiteSpace(q)))
            {
                list = list.Where(x => x.text.ToLower().StartsWith(q.ToLower())).ToList();
            }
            return Json(new { items = list }, JsonRequestBehavior.AllowGet);
        }
    }
}

Please help me.
thanks && Regards

What I have tried:

Actually i had implement the multiple values jquery autocomplete textbox.if the option or item not found in the list i want to add that option to autocomplete box

Posted 25-Dec-19 1:18am

Krishna Veni

Updated 25-Dec-19 3:29am

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MadMyche · Answer 1 · 2019-12-25T03:29:00

To add a new option to the select2 element you would use tagging
Dynamic option creation | Select2 - The jQuery replacement for select boxes[^]

Now if this is going to be a permanent addition you have an issue; as your controller is using a hard-coded list of countries to populate this box, and you can't just add to this code.

Perhaps you could move your countries to a fixed data source (e.g. SQL, XML, or a text file) which has the IDs, Text, and an "active" bit; just populate the displayed list with only those countries which are active.
And if a different country is submitted, you could update the active bit of the fixed data source for future usage