如何設置文本框只讀，如果它有價值？

Question

我想設置文本框只讀，如果它在MVC中的視圖值。

所以我寫

<tr> 
@if (model.first_name != "") { 
    <td > 
       @Html.LabelFor(model => model.first_name): 
      </td> 
      <td > 
       @Html.TextBoxFor(model => model.first_name) 
       <span class="required">*</span> 
       @Html.ValidationMessageFor(model => model.first_name) 
      </td> 
@ else 
    <td > 
    @Html.LabelFor(model => model.first_name): 
      </td> 
      <td > 
       @Html.EditorFor(model => model.first_name) 
       <span class="required">*</span> 
       @Html.ValidationMessageFor(model => model.first_name) 
      </td> 
@} 

      <td > 
       @Html.LabelFor(model => model.first_name): 
      </td> 
      <td > 
       @Html.EditorFor(model => model.first_name) 
       <span class="required">*</span> 
       @Html.ValidationMessageFor(model => model.first_name) 
      </td> 
     </tr> 

但就是不工作.. 如何解決售後服務呢?? 我該怎麼做？

Answer 1

在剃鬚刀中創建if語句，並在要禁用的輸入/編輯器上禁用=「禁用」。

@if 
(model.first_name != null) 
{ 

    <td > 
      @Html.LabelFor(model => model.first_name): 
     </td> 
     <td > 
      @Html.TextBoxFor(model => model.first_name) 
      <span class="required">*</span> 
      @Html.ValidationMessageFor(model => model.first_name) 
     </td> 
} 
else 
{ 
    <td > 
    @Html.LabelFor(model => model.first_name): 
     </td> 
     <td > 
      @Html.EditorFor(model => model.first_name, new { disabled = "disabled", @readonly = "readonly" })) 
      <span class="required">*</span> 
      @Html.ValidationMessageFor(model => model.first_name) 
     </td> 

     <td > 
      @Html.LabelFor(model => model.first_name): 
     </td> 
     <td > 
      @Html.EditorFor(model => model.first_name) 
      <span class="required">*</span> 
      @Html.ValidationMessageFor(model => model.first_name) 
     </td> 
    </tr> 

}

Answer 2

您可以進行現場的readonly="readonly"代替disabled="disabled" readonly字段值，同時仍然由用戶不可編輯提交到服務器。

Answer 3

您可以修改您的視圖模型像下面

public class MyViewModel 
{ 
    public string first_name { get; set; } 

    public object first_name_attributes 
    { 
    get 
    { 
     return string.IsNullOrEmpty(first_name) ? null : new { @readonly = "readonly" }; 
    } 
    } 
} 

在你的用戶界面，您可以添加聲明的對象。

Html.TextBoxFor(x => x.first_name, first_name_attributes) 

這導致了一個更簡單的用戶界面，視圖模型有單元測試的好處！