前面一篇文章我们谈到Html5 增加的一些input attrbitue，今天让我们来在Asp.net MVC 中写一些 HtmlHelper 让其更加简单的实现。直接看下面的代码：
#region private enum
/// <summary>
/// InputType enum
/// </summary>
private enum InputType
{
/// <summary>
/// Html5 input attribute
/// </summary>
Color, Date, DateTime, DateTime_Local, Email, Month, Number, Range, Search, Tel, Text, Time, Url, Week
}
#endregion
#region Public static method
/// <summary>
/// Colors the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Color(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Color, value, attributes);
}
/// <summary>
/// Dates the time.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString DateTime(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.DateTime, value, attributes);
}
/// <summary>
/// Dates the time local.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString DateTimeLocal(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.DateTime_Local, value, attributes);
}
/// <summary>
/// Emails the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Email(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Email, value, attributes);
}
/// <summary>
/// Monthes the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Month(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Month, value, attributes);
}
/// <summary>
/// Numbers the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Number(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Number, value, attributes);
}
/// <summary>
/// Ranges the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Range(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Range, value, attributes);
}
/// <summary>
/// Searches the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Search(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Search, value, attributes);
}
/// <summary>
/// Tels the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Tel(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Tel, value, attributes);
}
/// <summary>
/// Times the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Time(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Time, value, attributes);
}
/// <summary>
/// URLs the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Url(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Url, value, attributes);
}
/// <summary>
/// Weeks the specified helper.
/// </summary>
/// <param name="helper">The helper.</param>
/// <param name="name">The name.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
public static IHtmlString Week(this HtmlHelper helper, string name, object value = null, object attributes = null)
{
if (name.IsEmpty())
{
throw new ArgumentException("Value cannot be null or an empty string.", "name");
}
return BuildInputTag(name, InputType.Week, value, attributes);
}
#endregion
#region private static method
/// <summary>
/// Builds the input tag.
/// </summary>
/// <param name="name">The name.</param>
/// <param name="inputType">Type of the input.</param>
/// <param name="value">The value.</param>
/// <param name="attributes">The attributes.</param>
/// <returns>IHtmlString</returns>
private static IHtmlString BuildInputTag(string name, InputType inputType, object value = null, object attributes = null)
{
TagBuilder tag = new TagBuilder("input");
tag.MergeAttribute("type", GetInputTypeString(inputType));
tag.MergeAttribute("name", name, replaceExisting: true);
tag.GenerateId(name);
if (value != null || HttpContext.Current.Request.Form[name] != null)
{
value = value != null ? value : HttpContext.Current.Request.Form[name];
tag.MergeAttribute("value", value.ToString());
}
if (attributes != null)
{
var dictionary = attributes.GetType()
.GetProperties()
.ToDictionary(prop => prop.Name, prop => prop.GetValue(attributes, null));
tag.MergeAttributes(dictionary, replaceExisting: true);
}
return new HtmlString(tag.ToString(TagRenderMode.SelfClosing));
}
/// <summary>
/// Gets the input type string.
/// </summary>
/// <param name="inputType">Type of the input.</param>
/// <returns>string</returns>
private static string GetInputTypeString(InputType inputType)
{
if (!Enum.IsDefined(typeof(InputType), inputType))
{
inputType = InputType.Text;
}
return inputType.ToString().Replace('_', '-').ToLowerInvariant();
}
#endregion
@{
Validation.Add("email",
Validator.Required("You must provide an email address"),
Validator.Regex(@"^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$",
"Invalid format for an email address")
);
if(IsPost){
if (!Validation.IsValid()) {
ModelState.AddFormError("There are some errors with your submission");
}
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>My Site's Title</title>
<style>
body{font-family:Arial; font-size:12px; margin-left:20px;}
div{padding-top: 5px;}
</style>
</head>
<body>
@Html.ValidationSummary(true)
<form method="post">
<div>Email</div>
@Html.Email("email", attributes: new {required = "required"})
@Html.ValidationMessage("email")
<div>Colour</div>
@Html.Color("colour")
<div>Date Time</div>
@Html.DateTime("date")
<div>Range</div>
@Html.Range("range")
<div>Number</div>
@Html.Number("number", attributes: new { min=5, max=100, step=5 })
<div>Search</div>
@Html.Search("search", attributes: new { placeholder = "Enter Search Term" })
<div><input type="submit" /></div>
</form>
</body>
</html>
运行这个页面在适当浏览器下，当你输入的是不合法的Email，之前服务端的验证规则生效了。看下面图示:
好了，希望这篇文章能帮助您好。对您的应用程序开发做出更好的扩展。
作者：Petter Liu
出处：http://www.cnblogs.com/wintersun/
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
该文章也同时发布在我的独立博客中-Petter Liu Blog。
