我有以下MVC 5 Razor HTML助手：
@Html.TextBoxFor(m => m.ShortName,new { @class = "form-control",@placeholder = "short name"})
我需要这个字段是必需的(即当用户导航而不放置价值旅馆时，有一个红色的轮廓)。在WebForms HTML 5中，我只能说< input type =“text”required />有这个效果。
使用Razor语法完成此功能的正确语法是什么？
解决方法
如果需要，您可以使用所需的html属性：
@Html.TextBoxFor(m => m.ShortName,placeholder = "short name",required="required"})
或者您可以使用.Net中的RequiredAttribute类。使用jQuery，requiredAttribute可以在前端和服务器端进行验证。如果你想去MVC路线，我建议你阅读Data annotations MVC3 Required attribute。
要么
你可以得到真正的进步：
@{
// if you aren't using UnobtrusiveValidation,don't pass anything to this constructor
var attributes = new Dictionary<string,object>(
Html.GetUnobtrusiveValidationAttributes(ViewData.TemplateInfo.HtmlFieldPrefix));
attributes.Add("class","form-control");
attributes.Add("placeholder","short name");
if (ViewData.ModelMetadata.ContainerType
.GetProperty(ViewData.ModelMetadata.PropertyName)
.GetCustomAttributes(typeof(requiredAttribute),true)
.Select(a => a as requiredAttribute)
.Any(a => a != null))
{
attributes.Add("required","required");
}
@Html.TextBoxFor(m => m.ShortName,attributes)
}
或者如果您需要多个编辑器模板：
public static class ViewPageExtensions
{
public static IDictionary<string,object> GetAttributes(this ViewWebPage instance)
{
// if you aren't using UnobtrusiveValidation,don't pass anything to this constructor
var attributes = new Dictionary<string,object>(
instance.Html.GetUnobtrusiveValidationAttributes(
instance.ViewData.TemplateInfo.HtmlFieldPrefix));
if (ViewData.ModelMetadata.ContainerType
.GetProperty(ViewData.ModelMetadata.PropertyName)
.GetCustomAttributes(typeof(requiredAttribute),true)
.Select(a => a as requiredAttribute)
.Any(a => a != null))
{
attributes.Add("required","required");
}
}
}
那么在你的模板中
@{
// if you aren't using UnobtrusiveValidation,don't pass anything to this constructor
var attributes = this.GetAttributes();
attributes.Add("class","form-control");
attributes.Add("placeholder","short name");
@Html.TextBoxFor(m => m.ShortName,attributes)
}
