MVC4中具有模型绑定的两个@ Html.DropDownListFor的级联更新 [英] Cascading update of two @Html.DropDownListFor in MVC4 with model binding

问题描述

我看到了

I saw this, however I have a different Q. I have a view like this:

@model myPrj.Models.RollCallModel
...
<table>
    <tr> //Master DDL
       <td>
          @Html.LabelFor(model => model.CourseID) 
          @Html.DropDownListFor(model => model.CourseID,
            new SelectList(new myPrj.Models.myDbContext().Courses
               .Where(c => c.StatusID == 0), "ID", "ID"), 
            "choose...", new { id = "ddlCourse"})
          @Html.ValidationMessageFor(model => model.CourseID)
       </td>
     </tr>
     <tr> //Detail DDL
        <td>
            @Html.LabelFor(model => model.PersonnelID) 
            @Html.DropDownListFor(model => model.PersonnelID,
                 null, "choose another...", new { id = "ddlPersonnel"})
            @Html.ValidationMessageFor(model => model.PersonnelID)
        </td>
     </tr>
</table>
...

我对使用jquery级联更新了解得足够多.我的问题是，是否有可能对这些DDL执行级联更新，而无需为Detail DDL编写<option>something</option>的迭代?如果没有，最方便的选择是什么?

I know enough about cascading updates with jquery. My Q is that is it possible to perform a cascade update to these DDLs without needing to write an iteration of <option>something</option> for the Detail DDL? If no, what's the handiest alternative?

注意:实际上，由于模型绑定的约定，实际上我正在尝试使用html helper渲染详细DDL.如果我别无选择，只能用<select id=""></select>进行渲染，该如何将select元素绑定到模型上?

note: In fact I'm trying to render the detail DDL with html helper because of the convention of model binding. If I have no choice but to render it by <select id=""></select>, how can I bind this select element to the model?

感谢

更新:似乎没有办法...(仍在等待，甚至正在搜索...)

Update: It seems that there's no way... (still waiting and indeed searching...)

推荐答案

是的！当然有:详情请参阅.但是，它需要每个附加DDL的其他操作方法和局部视图.

Yeah! of course there is: See this for details. However it needs an additional action method and a partial view for each Detail DDL.

最后我想决定通过JQuery并在JsonResult上迭代地添加<options> ...

finally I like to decide to go through JQuery and iterationally adding <options> over the JsonResult...

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