I am a newbie in asp.net core mvc. Trying to make a simple update page where the model (coming from another data service) is bound with a table. On each row there is a update button. There are some fields which are mapped to the text box and are editable.

I want to get the editable values in text box within the controller without using jquery or ajax. I am sure there must be a way in plain asp.net core capabilities.

Model:

public class Employee
{
    public string Name { get; set; }
    public string Location { get; set; }
}

View:

@model IEnumerable<AspNetCoreMVC.Models.Employee>

@{
    ViewData["Title"] = "Home";
}

<table  style="width:fit-content">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(Model => Model.Name)
            </th>
            <th>
                @Html.DisplayNameFor(Model => Model.Location)
            </th>
            <th>

            </th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @item.Name
                </td>
                <td>
                    @Html.TextBoxFor(m => item.Location)
                </td>
                <td>
                    @Html.ActionLink("Update","UpdateAction","Home",new { updatedLocation = item.Location })
                </td>
            </tr>
        }
    </tbody>
</table>

Controller:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using AspNetCoreMVC.Models;

namespace AspNetCoreMVC.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {
            var employees = new List<Employee>();
            employees.Add(new Employee { Name="Abcd", Location="abcdLocation1"});
            employees.Add(new Employee { Name = "Efgh", Location = "EfghLocation2" });
            return View(employees);
        }

        public IActionResult UpdateAction(string updatedLocation)
        {
            var employees = new List<Employee>();
            employees.Add(new Employee { Name = "Abcd", Location = "abcdLocation1" });
            employees.Add(new Employee { Name = "Efgh", Location = "EfghLocation2" });
            return View("Index", employees);
        }
        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

Currently I only get the same value as bound by the cell template textbox. How can I make sure the changed text in the textbox location is received in the controller please ?

CodePudding user response：

In my case this worked when I used the @Html.EditorFor() helper instead of the @Html.TextBoxFor() helper, with setting the name attribute.

Therefore, try the following:

<tbody>
    @foreach (var item in Model)
    {
        @using (Html.BeginForm("UpdateAction", "Home"))
        {                
            <tr>
                <td>
                    @item.Name
                </td>
                <td>     
                    @* Setting the `name` attribute explicitly *@               
                    @Html.EditorFor(m => item.Location, "name", "updatedLocation")
                </td>
                <td>
                    <div><input type="submit" value="Update" /></div>                  
                </td>
            </tr>
        }
    }
</tbody>

Because of the binding context will already have the updatedLocation name, you don't need to define it in the Html.BeginForm().

And the [HttpPost] attribute should be added to theUpdateAction() action method declaration:

[HttpPost]
public IActionResult UpdateAction(string updatedLocation)
{
    ...
}

NOTE: An additional option is using the <input> tag instead of @Html.EditorFor() helper:

<input id="updatedLocation" name="updatedLocation" type="text" value="@item.Location" />

CodePudding user response：

Try to add a form outside <tr>:

<tbody>
        @foreach (var item in Model)
        { 
        <form asp-action="UpdateAction" asp-controller="Home" >
            <tr>
                <td>
                    @item.Name
                </td>
                <td>
                    @Html.TextBoxFor(m => item.Location)
                </td>
                <td>
                    <input type="submit" value="Update" />
                </td>
            </tr>
        </form>
        }
    </tbody>

And because name attribute bind with the property name in action,try to change your action like this:

public IActionResult UpdateAction(string Location)
        {
            var employees = new List<Employee>();
            employees.Add(new Employee { Name = "Abcd", Location = "abcdLocation1" });
            employees.Add(new Employee { Name = "Efgh", Location = "EfghLocation2" });
            return View("Index", employees);
        }