MVC3中的下拉列表的验证消息 [英] validation message for dropdownlist in MVC3

问题描述

如果使用select和option标签形成dropdownlist，如何将验证消息保留在mvc3中.

请找到dropDownlist的HTML代码

How to keep the validation message in mvc3 if dropdownlist is formed using select and option tags.

Please find the HTML code for the dropDownlist

<select name="SwList" style="width: 150px;">
    <option>--select-- </option>
    @foreach (var Sw in Model.SwDetails)
    {
        if (SwDetails.SwId == @Sw.SwId)
        {
        <option selected="selected" value=@Sw.SwId >
            @Sw.SwName

        </option>

        }
        else
        {
        <option value=@Sw.SwId >
            @Sw.SwName
        </option>

        }
       @*  @Html.ValidationMessageFor(Sw => Sw.SwId)*@
    }
</select>

推荐答案

最好有一个模型来收集所选项目的ID以及可能的选项列表.

例如遵循这些思路

Better to have a model that collects the ID of the selected item, as well as your list of possible options.

e.g. Soemthing along these lines

// View model
public class MyViewModel
{
    public int SelectedValue {get; set;}

    public IEnumerable<swdetails> {get; set;}
}

// Controller
public ActionResult ShowMyView
{
    var model = new MyViewModel();
    model.SwDetails = // However you get your list of items    
}

// View
@model MyViewModel

@Html.DropDownListFor(m => m.SelectedValue, new SelectList(Model.RatingScaleOptions, "SwId", "SwName"), "[Select One]")
@Html.ValidationMessageFor(m => m.SelectedValue)</swdetails>

因此，您可以使用"SelectValue"来检索由用户选择项目设置的值.验证与此字段相对.

So, you use the ''SelectValue'' to retrieve the value that is set by your user picking an item. Validation is against this field.

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