如何在MVC中根据下拉选择设置验证？

Question

这是我的查看代码：

<div class="form-group-1">
  @Html.LabelFor(model => model.device.HasAMC, htmlAttributes: new { @class = "control-label col-lg-4" })
  @Html.EditorFor(model => model.device.HasAMC, new { htmlAttributes = new { @class = "form-control" } })
 </div>
 <div class="form-group-1" id="HasDate">
    @Html.LabelFor(model => model.device.AMCExpiredDate, htmlAttributes: new { @class = "control-label col-lg-4" })
    @Html.EditorFor(model => model.device.AMCExpiredDate, new { htmlAttributes = new { @class = "form-control", placeholder = "AMCExpireDate(MM/dd/yyyy)", required = "required", title = "Enter AMC Expire Date" } })
 </div>
<button style="margin-left:33%;" class="btn btn-sm btn-primary col-lg-2 " type="button" name="action" onclick="javascript:Save(@ViewBag.DealerId);" value="SaveDeviceInfo"><strong>Save</strong></button>

在这种情况下，我需要设置必填字段“ AMCExpiredDate”，例如，如果“ HasAMC”的值选择为“ true”，则对必填字段应用验证，如果为false，则从“ AMCExpiredDate”中删除验证。

在MVC中这可能吗？ 请帮我。 提前致谢。

Answer 1

将您的视图更改为这样

 <div class="form-group-1">
      @Html.LabelFor(model => model.device.HasAMC, htmlAttributes: new { @class = "control-label col-lg-4" })
      @Html.EditorFor(model => model.device.HasAMC, new { htmlAttributes = new { @class = "form-control" } })
     </div>
     <div class="form-group-1" id="HasDate">
        @Html.LabelFor(model => model.device.AMCExpiredDate, htmlAttributes: new { @class = "control-label col-lg-4" })
        @Html.EditorFor(model => model.device.AMCExpiredDate, new { htmlAttributes = new { @class = "form-control", placeholder = "AMCExpireDate(MM/dd/yyyy)", required = "required", title = "Enter AMC Expire Date" } })

        // put validation-error  
      @Html.ValidationMessageFor(model => model.device.AMCExpiredDate);
                                    @if (@ViewData.ModelState["AMCExpiredDate"] != null && @ViewData.ModelState["AMCExpiredDate"].Errors.Count > 0)
                                    {
                                        <br/>
                                        <span class="field-validation-error col-md-10" style="margin-left: -14px;">
                                        @ViewData.ModelState["AMCExpiredDate"].Errors[0].ErrorMessage.Trim()
                                    </span>
                                    }

     </div>
    <button style="margin-left:33%;" class="btn btn-sm btn-primary col-lg-2 " type="button" name="action" onclick="javascript:Save(@ViewBag.DealerId);" value="SaveDeviceInfo"><strong>Save</strong></button>


            // create hidden field of your model variables
                 @Html.HiddenFor(modelItem => model.device.HasAMC)
                 @Html.HiddenFor(modelItem => model.device.HasAMC)

在服务器端

public ActionResult SaveMarks(mymodelClass model)

            if (model.device.HasAMC)
            {
               // validat you AMCExpiredDate expir date e.georgian
               if(model.device.AMCExpiredDate == null)
               {
                ModelState.AddModelError("AMCExpiredDate", "Please Proive you AMCExpiredDate");
               }
            }