Pass the Selected Values ​​of the ListBox to Controller in ASP.NET Core

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Pass the Selected Values ​​of the ListBox to Controller in ASP.NET Core

This blog explains how to send selected values of ListBox to ASP.NET Core Controller. Let's look at this with an example.

The following is the SampleViewModel class. It has two properties, Movies, and SelectedMovies. The property called Movies will bind the list of movies in the ListBox and the selected movie property will send the selected value from the view to the controller.

SampleViewModel.cs
using Microsoft.AspNetCore.Mvc.Rendering;
public class SampleViewModel
{
   public List<SelectListItem> Movies { get; set; }
   public string[] SelectedMovies { get; set; }
}

The following is a controller code. Microsoft.AspNetCore.Mvc.Rendering namespace is included to use SelectListItem.

The list of movies is assigned to the MoviesList variable. That MoviesList is assigned to the Movies property in the SampleViewModel. Finally, SampleViewModel is sent to view.

In the Result action method, the selected list is retrieved from the view and sent to the Result view to display the selected values on the page.

HomeController.cs
using Microsoft.AspNetCore.Mvc.Rendering;      
public IActionResult Index()
{
    List<SelectListItem> MoviesList = new List<SelectListItem>
    {
        new SelectListItem { Value = "1", Text = "Zootopia" },
        new SelectListItem { Value = "2", Text = "Moana" },
        new SelectListItem { Value = "3", Text = "Aladdin"  },
        new SelectListItem { Value = "4", Text = "The Lion King"  },
        new SelectListItem { Value = "5", Text = "Frozen"  }                
    };

    SampleViewModel model = new SampleViewModel()
    {
        Movies = MoviesList
    };
    return View(model);
}

[HttpPost]
public IActionResult Result(SampleViewModel selectedList)
{
    return View(selectedList.SelectedMovies);
}

Below is a view code. Here in the select tag helper size value is assigned as 5. Thus the list box will show 5 results. If the list box has a value of more than 5, a vertical scroll bar will appear and the user can view the values by moving the scroll bar.

Due to the 'multiple' attribute set, this allows multiple values to be selected. So on the webpage, it will provide a Listbox instead of a drop-down list.

Model.Movies property is assigned to the asp-items attribute, that will bind the list of movies to the list box. The SelectedMovies is assigned to asp-for, so it provides the controller with an array of movie IDs when submitting the form.

Index.cshtml
@{
    ViewData["Title"] = "Listbox Tag Helper";
    Layout = null;
}

@model SampleViewModel
<form asp-controller="Home" asp-action="Result" method="post">
    <div>
        <h4>Listbox Tag Helper</h4>
        <select size="5" multiple asp-items="Model.Movies" asp-for="SelectedMovies"></select>
    </div>
    <br />
    <input type="submit" value="submit" />
</form>

The final one is the result view. The selected movie names are received by the integer array and displayed using the for-loop.

Result.cshtml
@{
    ViewData["Title"] = "Listbox Tag Helper";
    Layout = null;
}

@model string[]
    <h4>Listbox Tag Helper</h4>
@{
    if (Model.Length > 0)
    {
        <div>Selected Movies Value</div>

        for (int i = 0; i < Model.Length; i++)
        {
            <div>@Model[i]</div>
        }
    }
}

The image below is the output of the code above.


I hope this article will be helpful to you. Keep coding

Related Article

Pass the Selected Values ​​of the ListBox from View to Controller in ASP.NET Core Using jQuery Ajax

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