利用Select2优化@Html.ListBoxFor显示，学会用MultiSelectList

最近需要用到多选框，Asp.Net MVC自带的@Html.ListBox或@Html.ListBoxFor的显示效果太差，于是找到了Select2进行优化，并正式了解了多选框的操作方法。

首先介绍多选框的操作方法；

一、定义一个MultipleSelectModel

public class MultipleSelectModel
    {
        public int[] MultipleItem { get; set; }
    }

二、在Controller中实例化MultiSelectList

public ActionResult MultipleSelectView()
        {
            //实际可从数据库取数填充
            List<SelectListItem> listBox = new List<SelectListItem>();
            for (int i = 0; i < 4; i++)
            {
                var temp = new SelectListItem
                {
                    Value = i.ToString(),
                    Text = "第" + i.ToString()
                };
                listBox.Add(temp);
            }
            //定义已选数据
            var viewModel = new MultipleSelectModel();
            viewModel.MultipleItem = new int[] { 0, 1 };

            ViewBag.MultiSelecteTest = new MultiSelectList(listBox, "Value", "Text");
            return View(viewModel);
        }

三、View中利用@Html.ListBoxFor()可初始化已选项

@model Models.ViewModel.MultipleSelectModel
@{
    ViewBag.Title = "MultipleSelectView";
    Layout = "~/Views/Shared/_Layout.cshtml";
}<h2>MultipleSelectView</h2>
@Html.ListBoxFor(model => model.MultipleItem, ViewBag.MultiSelecteTest as MultiSelectList, new { @class = "form-control multiple-select"})

四、利用Select2美化多选框

1、首先引用Select2的css文件及javascript文件，教学因素，没有将select2放在BundleConfig中

@Styles.Render("~/Content/jqueryui")
@Styles.Render("~/Content/select2")

@section scripts{
    <script src="~/Scripts/select2.min.js"></script>
}

2、简单使用Select2

<script type="text/javascript">
        $(document).ready(function () {
            $(‘.multiple-select‘).select2();
        });
    </script>

五、效果图

六、用Ajax刷新分页视图中如何使用到Select2

1、利用Ajax.BegionForm中的OnComplete，调用selectDeviceSuccess的jQuery方法

@using (Ajax.BeginForm("_PartialViewAction", "ViewTestr",
                                                                    new AjaxOptions() { HttpMethod = "POST",  OnComplete = "selectDeviceSuccess" },
                                                                    new { enctype = "multipart/form-data" }))

2、selectDeviceSuccess中再次使用Select2

function selectDeviceSuccess() {
    $(‘.multiple-select‘).select2({ language: ‘zh-CN‘ }); }

七、总结

@Html.ListBoxFor封装了初始化过程，传到后台的数据是数组int[] MultipleItem。用$(‘.multiple-select‘).val()获得选中值以‘,‘分隔。