Checkbox

DropDownList displays checkboxes to the left of each item when you set ShowCheckbox property to true. It allows you to select more than one item at a time from DropDownList. Popup list stays open until the user finishes selection. When you click on an item’s text or checkbox then the checkbox checked status get change.

@model MVCApplication.Controllers.HomeController
        
        @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value")).ShowCheckbox(true)
public ActionResult Index()
        {
            List<Data> DropDownData = new List<Data>();
            DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1" });
            DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2" });
            DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3" });
            DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4" });
            DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5" });
            ViewData["DropDownSource"] = DropDownData;
            return View();
        }
        public class Data
        {
            public string Value { get; set; }
            public string Text { get; set; }
        }

Checkbox

if you want to showcase the DropDownList with default checked items on data binding, specify Selected field with Boolean values.

@model MVCApplication.Controllers.HomeController
        
        @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value").Selected("Selected")).ShowCheckbox(true).Width("300px")
public ActionResult Index()
        {
            List<Data> DropDownData = new List<Data>();
            DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1", Selected=true });
            DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2", Selected=false });
            DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3", Selected=true });
            DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4", Selected=false });
            DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5", Selected=false });
            ViewData["DropDownSource"] = DropDownData;
            return View();
        }
        public class Data
        {
            public string Value { get; set; }
            public string Text { get; set; }
            public bool Selected { get; set; }
        }

Checkbox

Selection Modes

The MultiSelectMode property enables you to make multiple selections in the following two ways:

  • Delimiter
  • Visual Mode

IMPORTANT

“MultiSelectMode” property accepts Syncfusion.JavaScript.MultiSelectModeTypes enum value.

Delimiter

Each checked item’s text is appended to the textbox with delimiter “,” by default. This is enabled by assigning Syncfusion.JavaScript.MultiSelectModeTypes.Delimiter (enum) value to MultiSelectMode property. You can customize the delimiter option by using DelimiterChar property.

@model MVCApplication.Controllers.HomeController
        
        @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value")).ShowCheckbox(true).MultiSelectMode(MultiSelectModeTypes.Delimiter).DelimiterChar("-").Width("300px")
public ActionResult Index()
        {
            List<Data> DropDownData = new List<Data>();
            DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1" });
            DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2" });
            DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3" });
            DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4" });
            DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5" });
            ViewData["DropDownSource"] = DropDownData;
            return View();
        }
        public class Data
        {
            public string Value { get; set; }
            public string Text { get; set; }
        }

Delimiter

Visual Mode

When you enable this option in DropDownList control, each checked item’s text is appended to the text box in a box model layout. This is enabled by assigning Syncfusion.JavaScript.MultiSelectModeTypes.VisualMode (enum) value to MultiSelectMode property.

@model MVCApplication.Controllers.HomeController
        
        @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value")).ShowCheckbox(true).Width("300px").MultiSelectMode(MultiSelectModeTypes.VisualMode)
public ActionResult Index()
        {
            List<Data> DropDownData = new List<Data>();
            DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1" });
            DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2" });
            DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3" });
            DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4" });
            DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5" });
            ViewData["DropDownSource"] = DropDownData;
            return View();
        }
        public class Data
        {
            public string Value { get; set; }
            public string Text { get; set; }
        }

Visual

Select multiple values from controller

To pass selected values from controller, pass selected items using ViewBag, and assign this to the Value property of DropDownList. Refer to the following code.

  • html
  • @model MVCApplication.Controllers.HomeController
         
         @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value")).Value(ViewBag.Selected).ShowCheckbox(true)
  • c#
  • public ActionResult Index()
            {
                List<Data> DropDownData = new List<Data>();
                DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1" });
                DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2" });
                DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3" });
                DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4" });
                DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5" });
                ViewData["DropDownSource"] = DropDownData;
                ViewBag.Selected = "item1,item2";
                return View();
            }
            public class Data
            {
                public string Value { get; set; }
                public string Text { get; set; }
            }

    To pass multiple selected items from View to Controller, use ajax post to send selected items through change event of DropDownList. Refer to the following code

  • html
  • @model MVCApplication.Controllers.HomeController
         
        @Html.EJ().DropDownList("DropDownList1").Datasource((IEnumerable<Data>)ViewData["DropDownSource"]).DropDownListFields(Df => Df.Text("Text").Value("Value")).ClientSideEvents(e=>e.Change("Changed")).ShowCheckbox(true).Value(ViewBag.Selected)
  • js
  • function Changed(args) {
             $.ajax({
                    type: "POST",
                    url: '@Url.Action("Update")',
                    data: '{value: ' + JSON.stringify(args.model.value) + '}',
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    success: function (e) {
                        console.log(e.result);
                    },
                    error: function () {
                        alert("Error while sending data");
                    }
                });
        }
  • c#
  • public ActionResult Index()
            {
                List<Data> DropDownData = new List<Data>();
                DropDownData.Add(new Data { Value = "item1", Text = "ListItem 1" });
                DropDownData.Add(new Data { Value = "item2", Text = "ListItem 2" });
                DropDownData.Add(new Data { Value = "item3", Text = "ListItem 3" });
                DropDownData.Add(new Data { Value = "item4", Text = "ListItem 4" });
                DropDownData.Add(new Data { Value = "item5", Text = "ListItem 5" });
                ViewData["DropDownSource"] = DropDownData;
                ViewBag.Selected = "item1,item2";
                return View();
            }
            public class Data
            {
                public string Value { get; set; }
                public string Text { get; set; }
            }
    
            [HttpPost]
            public ActionResult Update(string Value)
            {
                var selected = Value;
                return Json(new { result = Value, JsonRequestBehavior.AllowGet });
            }

    Refer HowTo section to add check all option in popup list