@ Html.ListBox用于使用和创建问题

Question

我有一个带有2个列表框(list1,list2)的网页,我可以将项目从一个列表框转移到另一个列表框并返回.当我单击提交按钮时,我想将list2中的所有项值返回到httppost方法.

我有3个问题:

1. 如何确定所选列表的属性？
2. 如何获得一个初始的空列表(对于list2)？list1是否填充了项目？
3. 单击提交按钮时如何将所有list2项返回到模型？

模型:

public class TestModel
{
    public List<SelectListItem> OptionList { get; set; }
    public List<SelectListItem> SelectedOptionList { get; set; }
    public string[] SelectedOptions { get; set; }
}

控制器:

private TestModel testModel  = new TestModel();

public ActionResult TestPage()
{
    ViewBag.Message = "Test Page";

    testModel.OptionList = new List<SelectListItem>();

    for (int i = 1; i <= 100; i++)
    {
        SelectListItem item = new SelectListItem();
        item.Text = "Option " + i.ToString();
        item.Value = item.Text;

        testModel.OptionList.Add(item);
    }

    return View("TestView", testModel);
}

[HttpPost]
public ActionResult TestPage(TestModel formModel)
{
    testModel.SelectedOptionList = formModel.SelectedOptionList;
    testModel.SelectedOptions = formModel.SelectedOptions;

    //do something
    return RedirectToAction("TestPage");
}

视图:

@model EngineeringDataAnalysisGui.Models.TestModel

@{
    ViewBag.Title = @ViewBag.Message;
}

@section Subtitle
{
    @ViewBag.Message
}

<table width="100%">
@using (Html.BeginForm("TestPage", "RetrieveData", FormMethod.Post))
{
    <tr>
        <td>Event List:</td>
        <td>@Html.ListBox("lstEventSelection", Model.OptionList, new { id = "list1", Multiple = "multiple", Size = 15, style = "width: 100%;" })</td>
    </tr>
    <tr>
        <td></td>
        <td>
            <table style="text-align:center; width: 100%">
                <tr>
                    <td id="buttonCol">
                        <input type="button" id="btnAddAllEvent" title="Add All Events" onclick="moveAllOptions('list1','list2', true)" />
                        <input type="button" id="btnAddEvent" title="Add Selected Events" onclick="moveSelectedOptions('list1','list2', true)" />
                    </td>
                    <td id="buttonCol">
                        <input type="button" id="btnRemoveEvent" title="Remove Selected Events" onclick="moveSelectedOptions('list2','list1', true)" />
                        <input type="button" id="btnRemoveAllEvent" title="Remove All Events" onclick="moveAllOptions('list2','list1', true)" />
                    </td>
                </tr>
            </table>
        </td>
    </tr>
    <tr>
        <td>Selected Event List:</td>
        @*Not sure how to add the listbox*@
        <td>@*Wrong*@@Html.ListBoxFor(x => x.SelectedOptions, Model.SelectedOptionList, new { id = "list2", Multiple = "multiple", Size = 15, style = "width: 100%;" })</td>
    </tr>
    <tr>
        <td><input type="submit" value="submit" /></td>
    </tr>
}
</table>

Answer 1

1)如何确定所选列表的属性？
@Html.ListBoxFor(x => x.SelectedOptions, new MultiSelectList(Model.SelectedOptionList), new { id = "list2", Multiple = "multiple", Size = 15, style = "width: 100%;" })

2)如何获得一个初始的空列表(对于list2)？list1已填充项目.在控制器中设置一个空列表testModel.SelectedOptionList = new List<SelectListItem>();

3)如何在单击提交按钮时将所有list2项目返回到模型
可能需要在提交之前将list2中的所有项目设置为选中(使用jquery).list2项目中的所有选定项目将在提交时绑定到TestModel.SelectedOptions.

请环顾四周,在与Html.ListBoxFor相关的SO中已有很多答案.例如 ,在ListBoxFor中选择值的挑战