Flex advanceddatagrid 验证处理

Validator，是指flex验证器，用以验证输入是否满足条件，比如验证输入内容是否为数字，是否非空等。通常要了解Validator，应该了解Validator的工作原理，flex 默认Validator有哪写验证器，如何开发自定义验证器？

关于上述内容，flex官方文档Using_Flex_4.pdf validating data章节已有详细描述，这里不再赘述。本文重点讨论Flex的表格控件如何验证，以AdvancedDataGrid为例。

思路如下：

1）自定义Column，继承AdvancedDataGridColumn，自定义的Column具有诸多额外的属性及验证功能；

2）循环遍历表格的Column，判断其是否为自定义的Column，如果是则调用自定义的Column进行验证，返回验证结果。

实现如下：

1）创建自定义Column：SelfColumn, SelfColumn有字符串、数字2种验证类型代码如下：

package controls.datagrid { import mx.controls.AdvancedDataGrid; import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn; import mx.core.mx_internal; import mx.events.ValidationResultEvent; import mx.validators.StringValidator; import mx.validators.ValidationResult; public class SelfColumn extends AdvancedDataGridColumn{ private var _numberValidator:NumberValidator = new NumberValidator(); private var _stringValidator:StringValidator = new StringValidator(); public function SelfColumn(columnName:String = null) { super(columnName); } private var _required:Boolean = true; private var _needValidate:Boolean = true; private var _minLength:Object; private var _maxLength:Object; /** * 该列的值是否必须输入，默认可以为空 */ public function get required():Boolean{ return _required; } public function set required(value:Boolean):void{ this._required = value; } public function set minLength(value:Object):void{ this._minLength = value; this._stringValidator.minLength = value; } /** * 字符串最小长度 */ public function get minLength():Object{ return _minLength; } public function set maxLength(value:Object):void{ this._maxLength = value; this._stringValidator.maxLength = value; } /** * 字符串最大长度 */ public function get maxLength():Object{ return this._maxLength; } private var _minValue:Object; public function get minValue():Object{ return _minValue; } public function set minValue(value:Object):void{ _minValue = value; _numberValidator.minValue = value; } private var _maxValue:Object; public function get maxValue():Object{ return _maxValue; } public function set maxValue(value:Object):void{ _maxValue = value; _numberValidator.maxValue = value; } private var _validType:String = "none"; private static const VALIDTYPE_TEXT:String = "text"; private static const VALIDTYPE_NUMBER:String = "number"; private static const VALIDTYPE_NONE:String = "none"; [Inspectable(category="General",enumeration="none,text,number ",defaultValue="none")] /** * 验证类型 */ public function get validType():String{ return _validType; } public function set validType(value:String):void{ this._validType = value; // if(value!=VALIDTYPE_NONE) _needValidate = true; else _needValidate = false; } public function validate():ValidationResult{ var result:ValidationResult = null; if(_needValidate){//auto code switch(_validType){ case VALIDTYPE_NUMBER: result = validateNumber(); break; case VALIDTYPE_TEXT: break; } } if(result==null) result = new ValidationResult(false); return result; } private function validateNumber():ValidationResult{ _numberValidator.required = _required;