How to Create MultiSelect dropdown with checkboxes in Asp.NET MVC

Question

I would like to use the asp.net mvc multiselect dropdown with checkbox. How can I add checkboxes in the simplest way? I am using bootstrap v3

@Html.ListBoxFor(m => Model.DepDashTaskLists[i].BusinessRuleAnswers, new MultiSelectList(slh.GetRegistrationAnswerLookup(Model.DepDashTaskLists[i].BusinessRuleQuestion1), "Value", "Text", Model.DepDashTaskLists[i].BusinessRuleAnswers), new { @class = "form-control", @id = "RuleQuestionListBoxAnswer_" + @Model.DepDashTaskLists[i].TaskId, @rows = "2", @columns = "40" }) 

Answer 1

Here is a sample, base on @jishan siddique suggestion. You can visit the link to refer more: http://davidstutz.github.io/bootstrap-multiselect/

Hope to help, my friend:))

1. Model
public class ProductViewModel
    {
        public List<SelectListItem> Products { get; set; }
        public int[] ProductIds { get; set; }

    }

2. Controller
public IActionResult Index()
        {           
            var model = new ProductViewModel()
            {
                Products = GetProducts()
            };            
            return View(model);
        }

        [HttpPost]
        public ActionResult Index(ProductViewModel product)
        {                
            return View(product);
        }

        private List<SelectListItem> GetProducts()
        {
            var data = new List<SelectListItem>()
                {
                    new SelectListItem()
                    {
                        Value = "1", Text = "Tomato"
                    },
                    new SelectListItem()
                    {
                        Value = "2", Text = "Orange"
                    },
                    new SelectListItem()
                    {
                        Value = "3", Text = "Potato"
                    }
                };
            return data;
        }

3. Views
@model CiberProject.ViewModels.ProductViewModel
@{
    ViewData["Title"] = "Home Page";    
}

<link href="https://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css" rel="stylesheet" type="text/css" />

@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
    @Html.Label("Products:")
    <br />
    <br />
    @Html.ListBoxFor(m => m.ProductIds, Model.Products, new { @class = "listbox" })
    <br />
    <br />
    <input type="submit" value="Submit" />
}

@section Scripts
{
    <script src="https://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $('.listbox').multiselect({
                includeSelectAllOption: true
            });
        });
    </script>
}

Answer 2

1 First of all load the jQuery and Bootstrap framework into your HTML document.

<!-- jQuery -->
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

<!-- Bootstrap CSS -->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<!-- Bootstrap JS -->
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

2 After this, include the Bootstrap multiselect's CSS and JavaScript file to your page.

<!-- Bootstrap Multiselect CSS -->
<link rel="stylesheet" href="css/bootstrap-multiselect.css">

<!-- Bootstrap Multiselect JS -->
<script data-main="dist/js/" src="js/require.min.js"></script>

3 Now create HTML select element with your list of options with a unique id. Just like below.

<select id="mySelect" multiple="multiple">
<option value="Option one">Option one</option>
<option value="Option two">Option two</option>
<option value="Option three">Option three</option>
<option value="Option four">Option four</option>
<option value="Option five">Option five</option>
<option value="Option six">Option six</option>
</select>

4 And Finally call the plugin to active the multiselect.

<script>
require(['bootstrap-multiselect'], function(purchase){
$('#mySelect').multiselect();
});
</script>

You can visit the link to refer more: https://www.codehim.com/demo/bootstrap-multiselect-dropdown/