如何在MVC 4中自动将占位符属性添加到html输入类型编号? [英] How to automatically add placeholder attribute to html input type number in mvc 4?

问题描述

这是一个非常具体的问题.我设法使用保存在~/Views/Shared/EditorTemplates/文件夹中的名为EmailAddress.cshtml的编辑器模板将占位符属性自动添加到html5电子邮件输入类型中.请参见下面的代码:

This is a very specific issue. I managed to automatically add the placeholder attribute to html5 email input type by using an editor template called EmailAddress.cshtml, saved in ~/Views/Shared/EditorTemplates/ folder. See the code below:

@Html.TextBox("", ViewData.TemplateInfo.FormattedModelValue, new { @class = "text-box single-line", placeholder = ViewData.ModelMetadata.Watermark })

之所以有效，是因为我在视图模型中使用了[DataType(DataType.EmailAddress)] DataAnnotation.

It works because i'm using the [DataType(DataType.EmailAddress)] DataAnnotation in my view model.

不起作用的是当我使用int?变量时.

What doesn't works is when I use a int? variable.

public class MiageQuotaRequestViewModel
{
    [Required]
    [DataType(DataType.EmailAddress)]
    [Display(Name = "Nombre de place demandées", Prompt = "Nombre de place")]
    [Range(0, 50, ErrorMessage = "La demande doit être comprise entre 0 et 50 places")]
    public int? RequestedQuota { get; set; }
}

@Html.EditorFor像这样翻译此输入:

<input class="text-box single-line" data-val="true" data-val-number="The field Nombre de place demandées must be a number." data-val-range="La demande doit être comprise entre 0 et 50 places" data-val-range-max="50" data-val-range-min="0" data-val-required="Le champ Nombre de place demandées est requis." id="RequestedQuota" name="RequestedQuota" type="number" value="">

问题是我无法显示Prompt DataAnnotation(通常由placeholder翻译).另外，DataType枚举没有任何数字"或整数"值，可以让我像对EmailAddress数据类型那样使用EditorTemplate.

The problem is that I can't display the Prompt DataAnnotation (usually translated by placeholder). Also, the DataType enum doesn't have any "number" or "integer" value that can allow me to use the EditorTemplate like I did for the EmailAddress DataType.

推荐答案

基于 Pat Burke 评论，我可以结合使用UIHint数据属性和良好的编辑器模板.

Based on Pat Burke comment, I can use the UIHint data attribute combined with the good editor template.

以下是示例(Editor Template):

@Html.TextBox("", ViewData.TemplateInfo.FormattedModelValue, new { @class = "text-box single-line", placeholder = ViewData.ModelMetadata.Watermark, type = "number" })

(ViewModel)

public class MiageQuotaRequestViewModel
{
    [Required]
    [UIHint("Number")]
    [DataType(DataType.EmailAddress)]
    [Display(Name = "Nombre de place demandées", Prompt = "Nombre de place")]
    [Range(0, 50, ErrorMessage = "La demande doit être comprise entre 0 et 50 places")]
    public int? RequestedQuota { get; set; }
}

最后是结果:

<input class="text-box single-line" 
    data-val="true"
    data-val-number="The field Nombre de place demandées must be a number."
    data-val-range="La demande doit être comprise entre 0 et 50 places"
    data-val-range-max="50"
    data-val-range-min="0"
    data-val-required="Le champ Nombre de place demandées est requis."
    id="RequestedQuota"
    name="RequestedQuota"
    placeholder="Nombre de place"
    type="number"
    value="">

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