现在的需求是：下拉框中要是选择加盟商让其继续选择学校，要是选择平台管理员则不需要选择学校。隐藏选择下拉列表。

选择枚举值：

    /// <summary>    /// 平台角色    /// </summary>    public enum AdministratorRole    {        [Display(Name = "平台管理员")]        PlatformAdministrator = 1,        [Display(Name = "加盟商")]        JoiningTrader = 10    }

代码：

<div class="form-group">        @Html.LabelFor(x => x.AdministratorRole, new { @class = "col-sm-2 control-label" })        <div class="col-sm-8">            @Html.EnumDropDownListFor(x => x.AdministratorRole, new { @class = "form-control", onChange = "showSchool(this.value)", placeholder = Html.DisplayNameFor(x => x.AdministratorRole) })        </div>        <div class="col-sm-2">            <div class="help-block">@Html.ValidationMessageFor(x => x.AdministratorRole)</div>        </div>    </div>    <div class="form-group" style="display:none" id="schoolSelect">        @Html.LabelFor(x => x.SchoolId, new { @class = "col-sm-2 control-label" })        <div class="col-sm-8">            @Html.DropDownListFor(x => x.SchoolId, Model.Schools, new { @class = "form-control", placeholder = Html.DisplayNameFor(x => x.SchoolId) })        </div>        <div class="col-sm-2">            <div class="help-block">@Html.ValidationMessageFor(x => x.SchoolId)</div>        </div>    </div>

先让学校列表隐藏，style=”display:none”;效果和下图一样。我们利用下拉框的onChange事件来让其执行设定的方法showSchool(),这里面的参数是我们选择的值，this代表的AdministratorRole。

js代码：

<script type="text/javascript">        function showSchool(v){                if (10 == v) {            document.getElementById("schoolSelect").style = "display:inline";        } else {            document.getElementById("schoolSelect").style = "display:none";        }    }</script>

这样就可以了。

效果：

利用js取到下拉框中选择的值