标签: html.dropdownlistfor

是的,我知道,这个问题被提出/回答了34798796873.5次.我查看了所有3个bajillion,我仍然有问题.我在这里错过了什么？

我尝试了几种方法,但没有一种方法可行.以下是我最近的尝试:

<%:Html.DropDownList("Author",
    Model.AuthorItems.Select(i =>
        new SelectListItem
        {
            Text = i.Name,
            Value = i.Id.ToString(),
            Selected = i.Id == Model.Author.Id
        }), "??")%>

<%:Html.DropDownListFor(m => m.Author,
    new SelectList(Model.AuthorItems,
        "Id",
        "Name",
        Model.Author),
    "??") %>

我的视图模型非常简单:

public class EditArticleViewModel
{
    public AuthorItem Author { get; set; }

    public IList<AuthorItem> AuthorItems { get; set; }
    public class AuthorItem
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

我确保我的行动正常; 果然,作者的Id为5,而AuthorItems的Id为5.

我甚至尝试在模型中重写Equals和GetHashCode.

Blahhhhh !! 1

我怎样才能将以下内容转换为yii2

$dependency = new CDbCacheDependency('SELECT count(*) FROM job_title');
$jobTitle  = JobTitle ::model()->cache(CACHE_TIMEOUT,$dependency)->findAll($array);
$jobTitleList = CHtml::listData($jobTitle, 'job_title_id','desc');
return $jobTitleList;

我有以下代码不起作用.

use yii\db\ActiveRecord;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;

$items = array();
foreach (Jobsprocess::find()->where($array)->all() as $value) {
    $items[$value->process_id] = $value->jobsprocess;
}
return $items;

@Html.DropDownListFor(model => model.Activity.ActivityType, new 
     SelectList(Model.ActivityTypes, "ActivityTypeId", "Name") )

我在视图中得到了上面的下拉列表.在我的表单上提交时,所选的ActivityType无法绑定到我的模型中的Model.Activity.ActivityType属性.

有一个错误说无法将字符串转换为ActivityType.

我假设这是因为它只是试图绑定ActivityType的Name属性而不是整个对象.

我需要做些什么来确保在提交表单时所选的ActivityType正确绑定到模型？

谢谢

我在使用Razor语法的MVC 3中的代码片段有问题.在我的数据库表(MySQL)中,我有一个列(FK)LanguageID [int].然后,在该视图中,我想将该列分配给DropDownList,其中包含我即时生成的语言列表:

     List<SelectListItem> list = new List<SelectListItem>();

     list.Add(new SelectListItem
                    {
                        Value = tableRow.ID.ToString()
                        ,
                        Text = "language"
                    }

然后,在View中,我将该列表连接到Language属性:

@Html.DropDownListFor(
                 model => model.Language, 
                 new SelectList(ViewData["LanguageList"] as List<SelectListItem>,
                "Value", "Text")
                    )

但是,当我将数据发布到服务器时,它返回错误结果"The value '353' is invalid.",其中353是来自数据库的语言ID.我究竟做错了什么 ？

编辑Whle调试,我注意到ModelState中的错误消息: "The parameter conversion from type 'System.String' to type 'FavorytaWeb.Models.BookLanguage' failed because no type converter can convert between these types."

我一直在互联网上搜索并阅读了很多不同的方法来做到这一点，但由于某种原因，它们都不适合我。我这里一定缺少什么东西。我想做的是在选中复选框时用特定的选定值更新下拉列表。

用于选择的 HTML

    <select data-hands-jqui-props="{&quot;header&quot;:true,&quot;height&quot;:175,&quot;minWidth&quot;:225,&quot;classes&quot;:&quot;&quot;,&quot;checkAllText&quot;:&quot;Check all&quot;,&quot;uncheckAllText&quot;:&quot;Uncheck all&quot;,&quot;noneSelectedText&quot;:&quot;Select option&quot;,&quot;selectedText&quot;:&quot;# selected&quot;,&quot;selectedList&quot;:1,&quot;autoOpen&quot;:false,&quot;multiple&quot;:false,&quot;disabled&quot;:false,&quot;handsOnCreate&quot;:null}" data-hands-jqui-type="multiselect" data-val="true" data-val-date="The field  must be a date." id="SundayOpen" name="SundayOpen"><option value=""></option>
<option value="4/17/2013 12:00:00 AM">12:00 AM</option>
<option value="4/17/2013 12:15:00 AM">12:15 AM</option>
<option value="4/17/2013 12:30:00 AM">12:30 AM</option>
<option value="4/17/2013 12:45:00 AM">12:45 AM</option>
<option value="4/17/2013 1:00:00 AM">1:00 AM</option>
<option value="4/17/2013 1:15:00 AM">1:15 AM</option>
<option value="4/17/2013 1:30:00 AM">1:30 AM</option>
<option value="4/17/2013 1:45:00 AM">1:45 AM</option>
<option value="4/17/2013 2:00:00 AM">2:00 AM</option>
<option value="4/17/2013 2:15:00 AM">2:15 AM</option>
<option value="4/17/2013 2:30:00 AM">2:30 AM</option>
<option value="4/17/2013 2:45:00 AM">2:45 AM</option> …

无法将SelectListItem.Value属性从转换string为Boolean。如何创建一个简单的是/与价值无选项true/ false？

private List<SelectListItem> getYNOptions()
        {
            List<SelectListItem> yn = new List<SelectListItem>();
            yn.Add(new SelectListItem() { 
                Text = "Yes",
                Value=true, // error
                Selected = false
            });
            yn.Add(new SelectListItem()
            {
                Text= "No",
                Value = false, // error
                Selected = false
            });
            return yn;
        } 

public ActionResult Index(){
    ViewBag.selectList = getYNOptions();
    return View();
}

视图

 @Html.DropDownListFor(model => model.YesOrNo, new SelectList(ViewBag.selectList,"Value","Text"), "-- Select --")

我试图在我的mvc应用程序中基于model属性禁用或启用dropdownlistfor: -

我在做的是: -

@Html.DropDownListFor(m => m.ParentOrganisationID, new SelectList(Model.ParentOrganisations, "ID", "Name", Model.ParentOrganisationID), new { @id = "ddlParentOrganisations", @class = "form-control css-select", @disabled = Model.IsReadOnly ? "disabled" : "false", @style = "width:40%; height:10%;" })

但即使模型属性"model.IsReadOnly"为false,它也会将下拉列表显示为已禁用.

请建议如何处理此问题,而不使用任何JavaScript

提前致谢