asp.net mvc的如何添加占位html.dropdownlist [英] asp.net mvc How to add placeholder for html.dropdownlist

问题描述

我使用asp.net MVC 3。

I'm using asp.net mvc 3.

我有国家这个DropDownList的，我想添加一个占位符吧。这里是我的code：

I have this dropdownlist of countries and I want to add a placeholder for it. Here's my code:

@Html.DropDownList("country",
     new SelectList(ViewBag.countries as System.Collections.IEnumerable,
     "name", "name"), new { @class="chzn-select", @placeholder="-select-",
     @style="width:160px;" } )

但占位符不工作，而风格的作品。

But the placeholder doesn't work, while the style works.

我如何设置一个占位符吗？

How do I set a placeholder for this?

PS。我只想用 @ Html.DropDownList ，而不是 @ Html.DropDownListFor

PS. I just want to use @Html.DropDownList, not @Html.DropDownListFor

推荐答案

在您的收藏ViewBag.Countries刚从名为请选择 - 集合插入在一个虚拟的记录。你应该能够迫使选择的项目，像这样一个可选的构造：

In your collection ViewBag.Countries just insert a dummy record at the from of the collection with the name "-select-". You should be able to force the selected item with an alternate constructor like this:

@Html.DropDownList("country",
     new SelectList(ViewBag.countries as System.Collections.IEnumerable,
     "name", "name", "-select-"), new { @class="chzn-select", @style="width:160px;" } )

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