Asp.net Mvc自定义客户端验证(CheckBox列表的验证)

最近在使用MVC进行开发时，使用进行客户端的输入验证，加上使用MVC3的新视图引擎感觉还是挺方便的，不用自己去写很多js了，并且效果也能让人接受

可是遇上要向外输出比如一个CheckBox列表时就纠结了，验证代码还得自己去写，这样就造成了客户端采用了两套验证，感觉不统一也不优雅，于是就琢磨了一下，便有了如下实现方式。

 

HtmlHelper的扩展类主要包括CheckBoxList,CheckBoxListFor等方法,有了这些方法，你可以这样生成checkBox 列表

@Html.CheckBoxListFor(m=>m.RoleList,"li")

 下来就是扩展的全部代码 

HtmlHelperExtention.cs

using  System;
using  System.Collections.Generic;
using  System.Linq.Expressions;
using  System.Text;
using  System.Web.Mvc;

namespace  Newborn.BSCommon
{
     ///  

     ///  HtmlHelper扩展
     ///  

     public   static   class  HtmlHelperExtention
    {
         public   static  MvcHtmlString InputList( this  HtmlHelper helper, IEnumerable < SelectListItem >  selectList,  string  checkBoxName,  string  splitTagName, InputType inputType)
        {
             return  InputList(helper,  null , selectList, checkBoxName,splitTagName, inputType);
        }

         ///  

         ///  生成CheckBox列表
         ///  

         ///   HtmlHelper
         ///   name属性
         ///   每个SelectList外层
         ///   inputType
         ///   selectList
         ///   metadata
         ///   MvcHtmlString
         public   static  MvcHtmlString InputList( this  HtmlHelper helper,ModelMetadata metadata, IEnumerable < SelectListItem >  selectList,  string  checkBoxName,  string  splitTagName, InputType inputType)
        {
             if  (helper  ==   null )  throw   new  ArgumentNullException( " helper " );
             if  (selectList  ==   null )  throw   new  ArgumentNullException( " selectList " );
             if  ( string .IsNullOrEmpty(checkBoxName))  throw   new  ArgumentNullException( " checkBoxName " );
            
            StringBuilder sb  =   new  StringBuilder();
             int  idIndex  =   0 ;
            TagBuilder tagBuilder  =   new  TagBuilder( " span " );
             foreach  (SelectListItem item  in  selectList)
            {
                TagBuilder splitTagBuilder  =   null ;
                 if  ( ! string .IsNullOrEmpty(splitTagName))
                    splitTagBuilder  =   new  TagBuilder(splitTagName);
                TagBuilder checkTagBuilder  =   new  TagBuilder( " input " );
                checkTagBuilder.Attributes[ " type " ]  =  inputType.ToString();
                checkTagBuilder.Attributes[ " name " ]  =  checkBoxName;
                checkTagBuilder.Attributes[ " value " ]  =  item.Value;

                 string  checkBoxId  =  checkBoxName  +   " _id_ "   +  idIndex;
                checkTagBuilder.Attributes[ " id " ]  =  checkBoxId;
                 if  (item.Selected)
                    checkTagBuilder.Attributes[ " checked " ]  =   " checked " ;
                TagBuilder labelTagBuilder  =   new  TagBuilder( " label " ) { InnerHtml  =  helper.Encode(item.Text) };

                labelTagBuilder.Attributes[ " for " ]  =  checkBoxId;
                 string  checkHtml  =  checkTagBuilder.ToString()  +  labelTagBuilder.ToString();
                 if  (splitTagBuilder  !=   null )
                {
                    splitTagBuilder.InnerHtml  +=  checkHtml;
                    sb.AppendLine(splitTagBuilder.ToString());
                }
                 else
                    sb.AppendLine(checkHtml);

                idIndex ++ ;
            }
            
            TagBuilder hiddenTagBuilder  =   new  TagBuilder( " input " );
            hiddenTagBuilder.Attributes[ " type " ]  =   " hidden " ;
            hiddenTagBuilder.MergeAttribute( " name " , checkBoxName);
            hiddenTagBuilder.MergeAttribute( " id " ,  " hidden " +  checkBoxName);
            hiddenTagBuilder.MergeAttributes < string ,  object > (helper.GetUnobtrusiveValidationAttributes(checkBoxName, metadata));
            tagBuilder.InnerHtml  =  hiddenTagBuilder  +  sb.ToString();
             return  MvcHtmlString.Create(tagBuilder.ToString());
        }
         ///  

         ///  生成CheckBox列表
         ///  

         ///   HtmlHelper
         ///  
         ///   name属性
         ///   MvcHtmlString
         public   static  MvcHtmlString CheckBoxList( this  HtmlHelper helper, IEnumerable < SelectListItem >  selectList,  string  checkBoxName)
        {
             return  helper.InputList(selectList, checkBoxName,  null , InputType.CheckBox);
        }

         public   static  MvcHtmlString InputListFor < TModel, TProperty > ( this  HtmlHelper < TModel >  htmlHelper, Expression < Func < TModel, TProperty >>  expression, string  splitTag,InputType inputType)
        {
            ModelMetadata modelMetadata  =  ModelMetadata.FromLambdaExpression < TModel, TProperty > (expression, htmlHelper.ViewData);
            List < SelectListItem >  list  =  ((List < SelectListItem > )modelMetadata.Model);
             return  htmlHelper.InputList(modelMetadata, list, modelMetadata.PropertyName, splitTag, inputType);
        }
         public   static  MvcHtmlString CheckBoxListFor < TModel, TProperty > ( this  HtmlHelper < TModel >  htmlHelper, Expression < Func < TModel, TProperty >>  expression)
        {
             return  htmlHelper.InputListFor(expression,  " span " ,InputType.CheckBox);
        }
         public   static  MvcHtmlString CheckBoxListFor < TModel, TProperty > ( this  HtmlHelper < TModel >  htmlHelper, Expression < Func < TModel, TProperty >>  expression, string  splitTag)
        {
             return  htmlHelper.InputListFor(expression, splitTag, InputType.CheckBox);
        }

         ///  

         ///   生成CheckBox列表
         ///  

         ///  
         ///  
         ///  
         ///   每项分隔符的Tag名称
         ///  
         public   static  MvcHtmlString CheckBoxList( this  HtmlHelper helper, IEnumerable < SelectListItem >  selectList,  string  checkBoxName,  string  splitTagName)
        {
             return  InputList(helper, selectList, checkBoxName, splitTagName, InputType.CheckBox);
        }



         public   static  MvcHtmlString RadioBoxListFor < TModel, TProperty > ( this  HtmlHelper < TModel >  htmlHelper, Expression < Func < TModel, TProperty >>  expression)
        {
             return  htmlHelper.InputListFor(expression,  " span " , InputType.Radio);
        }

        

         ///  

         ///  生成RadioButton列表
         ///  

         ///  
         ///  
         ///  
         ///  
         ///  
         public   static  MvcHtmlString RadioButtonList( this  HtmlHelper helper, IEnumerable < SelectListItem >  selectList,  string  checkBoxName,  string  splitTag)
        {
             return  InputList(helper, selectList, checkBoxName, splitTag, InputType.Radio);
        }

         ///  

         ///  生成RadioButton列表
         ///  

         ///  
         ///  
         ///  
         ///  
         public   static  MvcHtmlString RadioButtonList( this  HtmlHelper helper, IEnumerable < SelectListItem >  selectList,  string  checkBoxName)
        {
             return  InputList(helper, selectList, checkBoxName,  null , InputType.Radio);
        }
    }
}

 

 由于使用到客户端验证所以要引用如下的js文件。

脚本部分

< script  src ="@Url.Content(" ~/Scripts/jquery-1.4.4.min.js")" type ="text/javascript" > script >
< script  src ="@Url.Content(" ~/Scripts/jquery.validate.min.js")" type ="text/javascript" > script >
< script  src ="@Url.Content(" ~/Scripts/jquery.validate.unobtrusive.min.js")" type ="text/javascript" > script >
< script  src ="@Url.Content(" ~/Scripts/Custom/jquery.validate.unobtrusive.extension.js")" type ="text/javascript" > script >
< script  type ="text/javascript" >
      $( function  () {
            new  checkBoxList( "RoleList " ,  "hiddenRoleList " ); // 初始验证
      });
script >

 

页面上还要写这个一句

 $(function () {
           new checkBoxList("RoleList", "hiddenRoleList");//初始验证

      }); 

 是为了让脚本去绑定事件，可能还会有更好的方式，这里有待研究。

 

页面上代码如下： 

HTML部分

< div  class ="select" >     
    @Html.CheckBoxListFor(m=>m.RoleList,"li")
    @Html.ValidationMessageFor(m => m.RoleList)
div >

 

ListSlectRangeAttribute.cs 文件

View Code

using  System;
using  System.Collections.Generic;
using  System.ComponentModel.DataAnnotations;
using  System.Web.Mvc;

namespace  Newborn.BSCommon
{
    [AttributeUsage(AttributeTargets.Property  |  AttributeTargets.Field  |  AttributeTargets.Parameter, AllowMultiple  =   false )]
     public   class  ListSlectRangeAttribute : ValidationAttribute, IClientValidatable
    {
         private   const   string  errFormat  =   " 该项最少选择项为{0}最多选择项为{1} " ;

         public  ListSlectRangeAttribute()
        {
            MinSelected  =   0 ;
            MaxSelected  =   - 1 ;
        }

         public   int  MinSelected {  get ;  set ; }

         public   int  MaxSelected {  get ;  set ; }

         public   override   bool  IsValid( object  value)
        {
             return   true ;
        }


         public   override   string  FormatErrorMessage( string  name)
        {
             return   string .Format(errFormat, MinSelected  >   0   ?  MinSelected.ToString() :  " 不限 " , MaxSelected  >   0   ?  MaxSelected.ToString() :  " 不限 " );
        }


         public  IEnumerable < ModelClientValidationRule >  GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            ModelClientValidationRule rule  =   new  ModelClientValidationRule
            {
                ValidationType  =   " list " ,
                ErrorMessage  =  FormatErrorMessage(metadata.GetDisplayName())
            };
            rule.ValidationParameters[ " min " ]  =  MinSelected;
            rule.ValidationParameters[ " max " ]  =  MaxSelected;

             yield   return  rule;
        }
    }
}

 

 

jquery.validate.unobtrusive.extension.js文件主要完成客户端如checkbox列表的验证,细心的朋友会发现因为checkbox列表是多个input所以我没有基于它来做，而是采用一个隐藏域还记录现在选择的项数目（目前只记录选择了多少项，没记录选择的项值之类的，不过目前暂无此类需求，如果有扩展起来也行方便）。

 

// by xianhong
// 添加验证如验证框必须选择一定数量的验证
$.validator.addMethod( " maxminselected " ,  function  (value, element, param) {
     var  min  =  param[ 0 ];
     var  max  =  param[ 1 ];
     if  (value  >=  min  &&  (max  <=   0   ||  value  <=  max))
         return   true ;
     return   false ;
});
$.validator.unobtrusive.adapters.addMinMax( " list " ,  " min " ,  " max " ,  " maxminselected " );


var  checkBoxList  =   function  (name /* input name属性 */ , hiddenId /* 记录选择的隐藏域 */ ) {
     this .checkedCount  =   function  () {
         var  selected  =  $( " input[name=' "   +  name  +   " ']:checked " );
         return  selected.length;
    };
     this .All  =   function  () {
         return  $( " input[name=' "   +  name  +   " '] " );
    };
     this .BindClick  =   function  () {
         var  thisobj  =   this ;
         this .All().click( function  () {
            $( " # "   +  hiddenId).val(thisobj.checkedCount());
        });
    };
     this .BindClick();
};

转载于:https://www.cnblogs.com/xianhong/archive/2011/04/21/2023831.html