无法选中 ASP.NET Core MVC 视图中的复选框

Question

I'm currently working on an ASP.NET Core 3.1 MVC application. I need to create a dynamic checkbox menu, which shows available fruits and stores the selected fruits into another data source.

My problem is, I cannot check/click any checkbox on my view and send the selected items back to my controller.

My FruitsViewModel looks like this:

public class FruitsViewModel
{
    public IList<string> SelectedFruits { get; set; } = new List<string>();

    public IList<SelectListItem> AvailableFruits { get; set; } = new List<SelectListItem>();
}

My FruitsController looks like this:

public class FruitsController : Controller
{
    [HttpGet]
    public async Task<IActionResult> Index()
    {
        var viewModel = new FruitsViewModel { 
                                                  AvailableFruits = GetAvailableFruits()
                                                };

        return View(viewModel);
    }

    [HttpPost]
    public async Task<IActionResult> Index(FruitsViewModel fruitsViewModel)
    {
        // ... process data
    }

    private IList<SelectListItem> GetAvailableFruits()
    {   
        // the values are originally retrieved from a DB, here I use just sample data   
        return new List<SelectListItem>
                       {
                           new SelectListItem {Text = "Apple", Value = "Apple"},
                           new SelectListItem {Text = "Pear", Value = "Pear"},
                           new SelectListItem {Text = "Banana", Value = "Banana"},
                           new SelectListItem {Text = "Orange", Value = "Orange"},
                       };
    }
}

My FruitsController Index.cshtml view looks like this:

<form method="post">
    <div class="form-group row">
        <!-- Fruits -->
        <label class="col-4">Fruits</label>
        <div class="col-8">
            @foreach (SelectListItem availableFruit in Model.AvailableFruits)
            {
                <div class="custom-control custom-checkbox custom-control-inline">
                    <label class="custom-control-label">
                        <input type="checkbox"
                               class="custom-control-input"
                               name="SelectedFruits"
                               value="@availableFruit.Value"
                               @if (Model.SelectedFruits.Contains(availableFruit.Value))
                               {
                                   @:checked
                               }/>
                        @availableFruit.Text
                    </label>
                </div>
            }
        </div>
    </div>
    <div class="form-group row">
        <div class="offset-4 col-8">
            <button name="submit" type="submit" class="btn btn-info">Send</button>
        </div>
    </div>
</form>

Do you know how to check a checkbox which is loaded dynamically on a ASP.NET Core MVC view and send the selected value back to the controller accordingly?

If possible I don't want to use jQuery.

I already followed this similar post .

Answer 1

I cannot check/click any checkbox on my view and send the selected items back to my controller.

You can try to modify the code like below to dynamically generate checkbox(es) with Bootstrap styles .

<div class="col-8">
    @foreach (SelectListItem availableFruit in Model.AvailableFruits)
    {
        <div class="custom-control custom-checkbox custom-control-inline">
            <input type="checkbox" id="@availableFruit.Value"
                    class="custom-control-input"
                    name="SelectedFruits"
                    value="@availableFruit.Value"
                    @if (Model.SelectedFruits.Contains(availableFruit.Value)) { @: checked
                    } />
            <label class="custom-control-label" for="@availableFruit.Value">@availableFruit.Text</label>
        </div>
                
    }
</div>

Test Result

Checked options

Get checked values in action method