如何留住在分页MVC3的WebGrid复选框值 [英] how to retain checkbox value in mvc3 webgrid on pagination

问题描述

我使用的是MVC3的WebGrid来显示一些数据，并已申请服务器端分页/排序。我也有在网格复选框栏。我的问题是，当我换页，我失去了选择的记录。我能够选择的行ID存储在一个会话变量，但我无法从会话中检索和值绑定到中的WebGrid的复选框。

I am using an MVC3 Webgrid to display some data, and have applied server side paging/sorting. I also have a checkbox column in the grid. My problem is that when I change pages, I am losing the selected records. I am able to store the selected row IDs in a session variable, but am unable to retrieve the values from the session and bind to the checkboxes in the Webgrid.

有人可以扔在这个问题上的一些灯？也请让我知道，如果有任何其他的/更好的办法。

Can someone throw some light on this issue? Please also let me know if there is any other/better approach.

先谢谢了。

推荐答案

下面是展示如何我已经做了一个小样本项目。它是基于不同的答案，我大部分时间发现堆栈溢出。

Here is a small sample project showing how I've done it. It's based on different answers I've found mostly on Stack Overflow.

诀窍是使用 @ Html.Raw ，只被选中的项目时发出检查属性。设置检查=假将无法工作！

The trick is to use @Html.Raw and only emit the checked attribute when the item is selected. Setting checked="false" won't work!

HomeController.cs：

using System;
using System.Collections.Generic;
using System.Web.Mvc;
using CheckboxPaging.Models;

namespace CheckboxPaging.Controllers
{
public class HomeController : Controller
{
    public ActionResult Index()
    {
        var players = new List<Player>
                          {
                              new Player {Id = "NOR41", Rank = 1, Name = "THORESEN Patrick", Country = "NOR", Points = 16},
                              new Player {Id = "RUS11", Rank = 2, Name = "MALKIN Yevgeni", Country = "RUS", Points = 14},
                              new Player {Id = "SWE40", Rank = 3, Name = "ZETTERBERG Henrik", Country = "SWE", Points = 13},
                              new Player {Id = "USA67", Rank = 4, Name = "PACIORETTY Max", Country = "USA", Points = 12},
                              new Player {Id = "SWE21", Rank = 5, Name = "ERIKSSON Loui", Country = "SWE", Points = 11},
                              new Player {Id = "NOR19", Rank = 6, Name = "SKRODER Per-Age", Country = "NOR", Points = 11},
                              new Player {Id = "CAN2", Rank = 7, Name = "KEITH Duncan", Country = "CAN", Points = 11},
                              new Player {Id = "FIN51", Rank = 8, Name = "FILPPULA Valtteri", Country = "FIN", Points = 9},
                              new Player {Id = "CAN20", Rank = 8, Name = "TAVARES John", Country = "CAN", Points = 9},
                              new Player {Id = "USA26", Rank = 10,Name = "STASTNY Paul", Country = "USA", Points = 9}
                          };

        ViewData["SelectList"] = HttpContext.Session["SelectList"] ?? new List<String>();

        return View(players);
    }

    [HttpPost]
    public ActionResult Select(bool isChecked, String id)
    {
        var selectList = (List<String>)HttpContext.Session["SelectList"] ?? new List<String>();
        if(isChecked && !selectList.Contains(id))
        {
            selectList.Add(id);
        }
        else if(!isChecked && selectList.Contains(id))
        {
            selectList.RemoveAll(s => s == id);
        }
        HttpContext.Session["SelectList"] = selectList;

        return Content("OK");
    }

    public ActionResult About()
    {
        return View();
    }
}
}

Index.cshtml：

@model IEnumerable<CheckboxPaging.Models.Player>

<script type="text/javascript">
    $(function () {
        $(':checkbox').change(function () {
            $.ajax({
                url: '@Url.Action("Select")',
                type: 'POST',
                data: { isChecked: $(this).is(':checked'), id: $(this).val() },
                success: function (result) {
                }
            });
        });
    });
</script>

@{
    var grid = new WebGrid(source: Model,
        defaultSort: "Rank",
        canSort: true,
        rowsPerPage: 5
       );
}

<h2>SCORING LEADERS As of TUE 15 MAY 2012</h2>

@grid.GetHtml(
    tableStyle: "grid",
    headerStyle: "head",
    alternatingRowStyle: "alt",
    columns: grid.Columns(
        grid.Column("Select", format: @<text><input name="Id" type="checkbox" value="@item.Id" @Html.Raw(((List<String>)ViewData["SelectList"]).Contains(@item.Id) ? "checked" : "") /></text>),
        grid.Column("Rank", "Rank"),
        grid.Column("Name", "Name"),
        grid.Column("Country", "Country"),
        grid.Column("Points", "Points")
        )
    )

Player.cs：

using System;

namespace CheckboxPaging.Models
{
    public class Player
    {
        public String Id { get; set; }
        public int Rank { get; set; }
        public String Name { get; set; }
        public String Country { get; set; }
        public int Points { get; set; }
    }
}

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