flex 自定义验证器(Validator)，先看下示例(有点大，500多K，请耐心等待加载...)

 

代码如下：

ValidatorDate.as 

1 package utils  2 {  3     import mx.controls.DateField;  4     import mx.validators.ValidationResult;  5     import mx.validators.Validator;  6       7     /**  8      * 用于验证起始时间必须小于结束时间。
  9      * 使用时必须指定 startDateField 与 endDateField，可选属性 errorMessage。
 10      * 注意：由于涉及到两个控件，所以对于 required 判断是同时的(必须两个时间同时不为空)，可自定义 requiredFieldError 使它看上去"正确"。 11      */ 12     public class ValidatorDate extends Validator 13     { 14         public function ValidatorDate() 15         { 16             super(); 17         } 18          19         private var _startDateField:DateField; 20  21         public function get startDateField():DateField 22         { 23             return _startDateField; 24         } 25  26         public function set startDateField(value:DateField):void 27         { 28             removeListenerHandler(); 29              30             _startDateField = value; 31              32             addListenerHandler(); 33         } 34  35         private var _endDateField:DateField; 36  37         public function get endDateField():DateField 38         { 39             return _endDateField; 40         } 41  42         public function set endDateField(value:DateField):void 43         { 44             removeListenerHandler(); 45              46             _endDateField = value; 47              48             addListenerHandler(); 49         } 50          51         private var _errorMessage:String = "起始时间不能晚于结束时间"; 52  53         public function get errorMessage():String 54         { 55             return _errorMessage; 56         } 57  58         public function set errorMessage(value:String):void 59         { 60             _errorMessage = value; 61         } 62          63          64         override protected function get actualListeners():Array 65         { 66             return [_startDateField, _endDateField]; 67         } 68          69         override protected function doValidation(value:Object):Array 70         { 71             var results:Array = super.doValidation(value); 72              73             if (results.length > 0 || ((value == null) && !required)) 74             { 75                 return results; 76             } 77             else 78             { 79                 var start:Date = value.startDate; 80                 var end:Date = value.endDate; 81                 if(start.time > end.time) 82                 { 83                     var vr:ValidationResult = new ValidationResult(true, "", "startIsAfterEnd", errorMessage); 84                     results.push(vr); 85                 } 86             } 87              88             return results; 89         } 90          91         override protected function getValueFromSource():Object 92         { 93             var value:Object = {}; 94              95             if(_startDateField && _endDateField && _startDateField.selectedDate && _endDateField.selectedDate) 96             { 97                 value.startDate = _startDateField.selectedDate; 98                 value.endDate = _endDateField.selectedDate; 99                 100                 return value;101             }102             else 103             {104                 return null;105             }106         }107         108         109     }110 }

 

示例程序：ValidateSample.mxml 

1 
       2 
      
        5     
       
         6         
         7         
        11     
       12     13     
       
        14         
        15         
        
         16             
         17             
         18         
        19         
        
         20             
         21         
        22         
        
         23             
         24         
        25     
       26