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Syncfusion Feedback

Having issues with the binding of the dropdown list not showing any items

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150143 Dec 23,2019 01:42 AM UTC Dec 24,2019 11:13 AM UTC ASP.NET Core - EJ 2 3
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Tags: Dropdown List
Shannan
Asked On December 23, 2019 01:42 AM UTC

I am trying to convert the standard core dropdown list to the Syncfusion control and not getting any results

This is the original code from core that worked:

Controller:

ViewData["TitleId"] = new SelectList(_context.Set<Title>(), "Id", "TitleName", member.TitleId);

View:

<label asp-for="TitleId" class="control-label"></label>
<select asp-for="TitleId" class="form-control" asp-items="ViewBag.TitleId"></select>
<span asp-validation-for="TitleId" class="text-danger">

I tried converting to the Syncfusion control this way:

                <ejs-dropdownlist id="TitleId" placeholder="Title" ejs-for="TitleId" dataSource="@ViewBag.TitleId" floatLabelType="Auto">
                    <e-dropdownlist-fields text="Title.TitleName" value="Title.Id"></e-dropdownlist-fields>
                </ejs-dropdownlist>

But the dropdown is empty.

The Title model is this:

    public class Title
    {
        public int Id { get; set; }
        public string TitleName { get; set; }
        public int SortOrder { get; set; } 
    }

Sevvandhi Nagulan [Syncfusion]
Replied On December 23, 2019 05:06 AM UTC

Hi Shannan,  
 
Greetings from Syncfusion support. 
 
We have checked the reported requirement. We have prepared sample with Syncfusion control DataBinding with the DropDownListFor control. Kindly refer the below code, 
 
[index.cshtml] 
 
<ejs-dropdownlist id="Countries"  ejs-for="Value" dataSource="@ViewBag.data" placeholder="Select a Country" popupHeight="220px"> 
    <e-dropdownlist-fields text="Country.CountryId" value="Code.Id"></e-dropdownlist-fields> 
</ejs-dropdownlist> 
 
[HomeController.cs] 
 
  public IActionResult Index() 
        { 
            ViewBag.data = new Complex().GetData(); 
            model.Value = "AU"; 
            return View(model); 
        } 
        public class Code 
        { 
            public string Id { get; set; } 
        } 
 
        public class Country 
        { 
            public string CountryId { get; set; } 
        } 
        public class modelValue 
        { 
             public string Value { get; set; } 
        } 
        public class Complex 
        { 
            public Country Country { get; set; } 
            public Code Code { get; set; } 
            public List<Complex> GetData() 
            { 
                List<Complex> data = new List<Complex>(); 
                data.Add(new Complex() { Country = new Country() { CountryId = "Australia" }, Code = new Code() { Id = "AU" } }); 
                data.Add(new Complex() { Country = new Country() { CountryId = "Bermuda" }, Code = new Code() { Id = "BM" } }); 
                data.Add(new Complex() { Country = new Country() { CountryId = "Canada" }, Code = new Code() { Id = "CA" } }); 
                data.Add(new Complex() { Country = new Country() { CountryId = "Cameroon" }, Code = new Code() { Id = "CM" } }); 
                data.Add(new Complex() { Country = new Country() { CountryId = "Denmark" }, Code = new Code() { Id = "DK" } }); 
                data.Add(new Complex() { Country = new Country() { CountryId = "France" }, Code = new Code() { Id = "FR" } }); 
                return data; 
            } 
        } 
 
Please find the sample below, 
 
 
 
Regards,  
Sevvandhi N  


Shannan
Replied On December 23, 2019 07:36 AM UTC

That is the same info from the documentation and it does not work.

I was able to get the control to populate by adding this to the controller:

List<Title> titles = new List<Title>();
titles = _context.Titles.ToList();
ViewBag.datasource = titles;

Is your dropdownlist control not able to use the asp.net core SelectList<> type? Only after I passed a List<> to it did it work.

Sevvandhi Nagulan [Syncfusion]
Replied On December 24, 2019 11:13 AM UTC

Hi Shannan,  
 
From the code, you shared, we tried to reconstruct your scenario. In that SelectList class returns a list of properties as given in the below MSDN link:    
 
Datasource property in our Dropdownlist cannot directly access the items property of the Selectlist constructor. Hence we need to map the Selectlist properties to the respective dropdownlist’s properties. Kindly refer the below code, 
 
[index.cshtml] 
@{ 
    var select = new SelectList((IEnumerable<WebApplication1.Controllers.HomeController.Dictionaryy>)ViewData["Regions"], "ID", "Title"); 
} 
<ejs-dropdownlist id="Countries" dataSource=select.Items placeholder="Select a Country" popupHeight="220px"> 
    <e-dropdownlist-fields text='Title' value='ID'></e-dropdownlist-fields> 
</ejs-dropdownlist> 
 
Please find the sample below, 
 
 
 
Regards,  
Sevvandhi N  


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