MVC Razor：如果 html 文本框元素内有其他条件

Question

我正在尝试使用以下代码使用 MVC Razor 创建条件：

@Html.TextBoxFor(m => Model.MyList[i].Value
new { autocomplete = "off", 
spellcheck = "false", data_val = 
Model.MyList[i].IsRequired.ToString().ToLower(), data_val_required = $"The 
field {Model.MyList[i].Description} is required", @: 
if(Model.MyList[i].FieldType == 0) { data_val_number = "Please enter     
`number" } })`

Answer 1

您可以创建一个 if/else 块来根据 FieldType

生成文本框

@if(Model.MyList[i].FieldType == 0)
{
@Html.TextBoxFor(m => Model.MyList[i].Value
new { autocomplete = "off", 
spellcheck = "false", data_val = 
Model.MyList[i].IsRequired.ToString().ToLower(), data_val_required = $"The 
field {Model.MyList[i].Description} is required", data_val_number = "Please enter     
`number" } })`
}
else
{
@Html.TextBoxFor(m => Model.MyList[i].Value
new { autocomplete = "off", 
spellcheck = "false", data_val = 
Model.MyList[i].IsRequired.ToString().ToLower(), data_val_required = $"The 
field {Model.MyList[i].Description} is required"} })`
}

或

使用条件 html 属性：

@{
  var myMessage = Model.MyList[i].FieldType == 0 ? "my message" : null;
}

@Html.TextBoxFor(m => Model.MyList[i].Value
new { autocomplete = "off", spellcheck = "false", data_val = 
Model.MyList[i].IsRequired.ToString().ToLower(), data_val_required = $"The 
field {Model.MyList[i].Description} is required", data_val_number = "@myMessage" 
})`

如果@myMessage 为 null，Razor 足够聪明，不会发出 data_val_number。

关于条件属性的一些信息：

https://www.davidhaney.io/mvc4-conditional-html-attributes/

Conditional HTML Attributes using Razor MVC3

MVC 3: Conditionally Adding the Disabled Attribute with the HtmlHelpers

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