.Net 3.0 添加了一个语法糖就是扩展方法,其实扩展方法的本质就是对类的静态方法的调用,虽然扩展方法只是
扩展方法来链式的对MVC 3中的页面进行验证。对于Mvc的验证,有很多种方式,其中我们经常使用的就是Model的验证,这是最直接最有效的我们操作的方式,可以对一个字段进行多个条件的验证。但是这种验证方式有一个弊端,就是我们不能在页面上直接看到对该字段进行了
都会毫不犹豫的说是ViewPage,当然这不能说是错的,因为Mvc 2 确实是继承自ViewPage基类,但是在Razor 视图下,是继承自WebViewPage类的,如果你的扩展方法扩展的是ViewPage,那么对不起,你在页面上是无法看到这个扩展方法的,除非继承自WebViewPage。希望大家扩展页面方法的时候注意一下类的继承问题。
namespace MvcWeb.Extensions
{
public class JqueryHel
PEr
{
public ViewContext ViewContext { get;
PRivate set; }
public WebViewPage ViewPage { get; private set; }
public RouteCollection RouteCollection { get; private set; }
public JqueryHelper(ViewContext viewContext, WebViewPage page, RouteCollection routeCollection)
{
this.ViewContext = viewContext;
this.ViewPage = page;
this.RouteCollection = routeCollection;
}
public JqueryHelper(ViewContext viewContext, WebViewPage viewPage) : this(viewContext, viewPage, RouteTable.Routes) { }
}
public static class JqueryExtensions
{
public static JqueryHelper Jquery(this WebViewPage page)
{
VAR key = typeof(JqueryHelper);
var jquery = page.PageData[key] as JqueryHelper;
if (jquery
== null)
{
page.PageData[key] = jquery = new JqueryHelper(page.ViewContext, page);
}
return jquery;
}
}
public class JqueryValidations
{
public WebViewPage Page { get; private set; }
public JqueryValidations(WebViewPage page)
{
this.Page = page;
}
private Dictionary<string, Dictionary<string, object>> m_rules = new Dictionary<string, Dictionary<string, object>>();
private Dictionary<string, Dictionary<string, object>> m_message = new Dictionary<string, Dictionary<string, object>>();
public void Requi
red(string n
ame,string message)
{
this.AddRuleAndMessage(name, "required", true, message);
}
public void Em
ail(string name, string message)
{
this.AddRuleAndMessage(name,"email",true,message);
}
public void Number(string name, string message)
{
this.AddRuleAndMessage(name, "number", true, message);
}
public void Range(string name,int min,int max, string message)
{
this.AddRuleAndMessage(name, "range", new int[] { min, max }, message);
}
public string ToScripts(string form)
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
StringBuilder builder = new StringBuilder();
builder.Append("$(");
serializer.Serialize(form, builder);
builder.Append(").validate(");
serializer.Serialize(
new
{
rules = this.m_rules,
messages = this.m_message,
onkeyup = false
}, builder);
builder.Append(");");
return builder.ToString();
}
public ValidationElement Element(string name)
{
return new ValidationElement(name, this);
}
private void AddRuleAndMessage(string name, string rule, object value, string message)
{
if (!this.m_rules.ContainsKey(name))
{
this.m_rules[name] = new Dictionary<string, object>();
}
this.m_rules[name][rule] = value;
if (!string.IsNullOrEmpty(message))
{
if (!this.m_message.ContainsKey(name))
{
this.m_message[name] = new Dictionary<string, object>();
}
this.m_message[name][rule] = message;
}
}
}
public class ValidationElement
{
public ValidationElement(string name, JqueryValidations validations)
{
this.Name = name;
this.Validations = validations;
}
public string Name { get; private set; }
public JqueryValidations Validations { get; private set; }
public ValidationElement Required(string message)
{
this.Validations.Required(this.Name, message);
return this;
}
public ValidationElement Email(string message)
{
this.Validations.Email(this.Name, message);
return this;
}
public ValidationElement Number(string message)
{
this.Validations.Number(this.Name, message);
return this;
}
public ValidationElement Range(int min, int max, string message)
{
this.Validations.Range(this.Name, min, max, message);
return this;
}
}
public static class JQueryValidationExtensions
{
public static JqueryValidations Validations(this JqueryHelper jquery)
{
return jquery.Validations("(default)");
}
public static JqueryValidations Validations(this JqueryHelper jquery, string name)
{
var key = typeof(JqueryValidations) + "+" + name;
var page = jquery.ViewPage;
var validations = page.PageData[key] as JqueryValidations;
if (validations == null)
{
page.PageData[key] = validations = new JqueryValidations(page);
}
return validations;
}
}
}
在这段代码中定义了JqueryHelper 类,是对WebViewPage的扩展,其中有一个方法ToScript 我们要特别注意一下,这个方法是在页面上显示一段拼接的js,也就是jquery.validation.js
具体代码我就不细说了,我介绍一下基本思想吧。首先我们定义了一个JqueryHelper类,然后顶一个JqueryValidation类来定义对页面元素可以进行的验证。这里面有一个链式方法必须用到的就是每个验证方法返回的结果都是JqueryValidation类的对象,这样我们才可以进行
@{
Layout = null;
}
@using MvcWeb.Extensions
<!DOCTYPE ht
ML>
<html>
<head>
<title>Index</title>
<script src="http://www.cn
blogs
.COM/Scripts/jquery-1.5.1.js" type="text/javascript"></script>
<script type="text/javascript" src="@Url.Content("http://www.cnb
LOGs.com/Scripts/jquery-1.5.1-vsdoc.js")"></script>
<script type="text/javascript" src="@Url.Content("http://www.cnblogs.com/scripts/jquery.validate.js")"></script>
</head>
<body>
<div>
<form id="form" action="" method="post">
<input type="text" id="user.Name" name="user.Name" />
@{ this.Jquery().Validations().Required("user.Name","用户名是必填的 亲");}
<select name="user.Gender">
<option value="">Please select
...</option>
<option value="1">
;male</option>
<option value="2">Femle</option>
</select>
@{ this.Jquery().Validations().Required("user.Gender", null);}
<input type="text" name="user.Email" />
@{this.Jquery().Validations().Element("user.Email").Required("邮箱是必填的").Email("请填写正确的邮箱格式");}
<input type="submit" value="提交" />
</form>
</div>
<script type="text/javascript">
@Html.Raw(this.Jquery().Validations().ToScripts("#form"))
</script>
</body>
</html>
。但是我们在设计可以用来进行链式方法操作的时候一定要注意的就是所有的链式方法的返回值类型尽量相同,因为这便于我们不需要掌握顺序。有的园友会提出不同意见,linq语法就不是所有的返回值类型都相同,但是我们要知道,我们在使用linq的时候,方法的调用顺序是很