RegExpValidator

套件	mx.validators
類別	public class RegExpValidator
繼承	RegExpValidator Validator EventDispatcher Object

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

The RegExpValidator class lets you use a regular expression to validate a field. You pass a regular expression to the validator using the expression property, and additional flags to control the regular expression pattern matching using the flags property.

The validation is successful if the validator can find a match of the regular expression in the field to validate. A validation error occurs when the validator finds no match.

The RegExpValidator class dispatches the valid and invalid events. For an invalid event, the event object is an instance of the ValidationResultEvent class, and it contains an Array of ValidationResult objects.

However, for a valid event, the ValidationResultEvent object contains an Array of RegExpValidationResult objects. The RegExpValidationResult class is a child class of the ValidationResult class, and contains additional properties used with regular expressions, including the following:

matchedIndex An integer that contains the starting index in the input String of the match.
matchedString A String that contains the substring of the input String that matches the regular expression.
matchedSubStrings An Array of Strings that contains parenthesized substring matches, if any. If no substring matches are found, this Array is of length 0. Use matchedSubStrings[0] to access the first substring match.

MXML 語法

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The <mx:RegExpValidator> tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:

  <mx:RegExpValidator
    expression="No default" 
    flags="No default" 
    noExpressionError="The expression is missing." 
    noMatchError="The field is invalid." 
  />

檢視範例

公用屬性

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	屬性		定義自
		constructor : Object 類別物件的參照或是特定物件實體的建構函數。	Object
		enabled : Boolean Setting this value to false will stop the validator from performing validation.	Validator
		expression : String The regular expression to use for validation.	RegExpValidator
		flags : String The regular expression flags to use when matching.	RegExpValidator
		listener : Object Specifies the validation listener.	Validator
		noExpressionError : String Error message when there is no regular expression specifed.	RegExpValidator
		noMatchError : String Error message when there are no matches to the regular expression.	RegExpValidator
		property : String A String specifying the name of the property of the source object that contains the value to validate.	Validator
		required : Boolean = true If true, specifies that a missing or empty value causes a validation error.	Validator
		requiredFieldError : String Error message when a value is missing and the required property is true.	Validator
		source : Object Specifies the object containing the property to validate.	Validator
		trigger : IEventDispatcher Specifies the component generating the event that triggers the validator.	Validator
		triggerEvent : String Specifies the event that triggers the validation.	Validator

保護屬性

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	屬性		定義自
		actualListeners : Array [唯讀] Contains an Array of listener objects, if any, or the source object.	Validator
		actualTrigger : IEventDispatcher [唯讀] Contains the trigger object, if any, or the source object.	Validator
		resourceManager : IResourceManager [唯讀] A reference to the object which manages all of the application's localized resources.	Validator
		subFields : Array An Array of Strings containing the names for the properties contained in the value Object passed to the validate() method.	Validator

公用方法

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	方法		定義自
		RegExpValidator() Constructor	RegExpValidator
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void 會在 EventDispatcher 物件註冊事件偵聽程式，以便讓偵聽程式收到事件的通知。	EventDispatcher
		dispatchEvent(event:Event):Boolean 會將事件傳送到事件流程。	EventDispatcher
		hasEventListener(type:String):Boolean 會檢查 EventDispatcher 物件是否有對特定的事件類型註冊偵聽程式。	EventDispatcher
		hasOwnProperty(name:String):Boolean 指出物件是否有已定義的指定屬性。	Object
		initialized(document:Object, id:String):void Called automatically by the MXML compiler when the Validator is created using an MXML tag.	Validator
		isPrototypeOf(theClass:Object):Boolean 指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。	Object
		propertyIsEnumerable(name:String):Boolean 指出指定的屬性是否存在，以及是否可列舉。	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void 會從 EventDispatcher 物件移除偵聽程式。	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void 為迴圈作業設定動態屬性的可用性。	Object
		toLocaleString():String 傳回代表此物件的字串，根據地區特定慣例進行格式化。	Object
		toString():String 會傳回指定之物件的字串形式。	Object
		validate(value:Object = null, suppressEvents:Boolean = false):ValidationResultEvent Performs validation and optionally notifies the listeners of the result.	Validator
		validateAll(validators:Array):Array [靜態] Invokes all the validators in the validators Array.	Validator
		valueOf():Object 會傳回指定之物件的基本值。	Object
		willTrigger(type:String):Boolean 檢查此 EventDispatcher 物件是否已註冊事件偵聽程式，或者此物件的任何祖系已為特定事件類型註冊事件偵聽程式。	EventDispatcher

保護方法

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	方法		定義自
		addListenerHandler():void Sets up all of the listeners for the valid and invalid events dispatched from the validator.	Validator
		doValidation(value:Object):Array [覆寫] Override of the base class doValidation() method to validate a regular expression.	RegExpValidator
		getValueFromSource():Object Returns the Object to validate.	Validator
		handleResults(errorResults:Array):ValidationResultEvent Returns a ValidationResultEvent from the Array of error results.	Validator
		isRealValue(value:Object):Boolean Returns true if value is not null.	Validator
		removeListenerHandler():void Disconnects all of the listeners for the valid and invalid events dispatched from the validator.	Validator
		resourcesChanged():void This method is called when a Validator is constructed, and again whenever the ResourceManager dispatches a "change" Event to indicate that the localized resources have changed in some way.	Validator

事件

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	摘要	定義自
activate	[廣播事件] 當 Flash Player 或 AIR 應用程式取得作業系統焦點並成為作用中時傳送。	EventDispatcher
deactivate	[廣播事件] 當 Flash Player 或 AIR 應用程式失去作業系統焦點並成為非作用中時傳送。	EventDispatcher
invalid	Dispatched when validation fails.	Validator
valid	Dispatched when validation succeeds.	Validator

保護常數

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	常數		定義自

屬性詳細資訊

expression

屬性

expression:String

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

The regular expression to use for validation.

實作
public function get expression():String
public function set expression(value:String):void

flags

屬性

flags:String

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

The regular expression flags to use when matching.

實作
public function get flags():String
public function set flags(value:String):void

noExpressionError

屬性

noExpressionError:String

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Error message when there is no regular expression specifed. The default value is "The expression is missing."

實作
public function get noExpressionError():String
public function set noExpressionError(value:String):void

noMatchError

屬性

noMatchError:String

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Error message when there are no matches to the regular expression. The default value is "The field is invalid."

實作
public function get noMatchError():String
public function set noMatchError(value:String):void

建構函式詳細資料

()

建構函式

public function RegExpValidator()

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Constructor

方法詳細資訊

doValidation

()

方法

override protected function doValidation(value:Object):Array

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Override of the base class doValidation() method to validate a regular expression.

You do not call this method directly; Flex calls it as part of performing a validation. If you create a custom Validator class, you must implement this method.

參數

value:Object — Object to validate.

傳回值

Array — For an invalid result, an Array of ValidationResult objects, with one ValidationResult object for each field examined by the validator.

範例如何使用本範例

RegExValidatorExample.mxml

<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the RegExpValidator. -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            import mx.events.ValidationResultEvent;
            import mx.validators.*;

            // Write the results to the 
            private function handleResult(eventObj:ValidationResultEvent):void {
                if (eventObj.type == ValidationResultEvent.VALID) {
                    // For valid events, the results Array contains
                    // RegExpValidationResult objects.
                    var xResult:RegExpValidationResult;
                    reResults.text = "";
                    for (var i:uint = 0; i < eventObj.results.length; i++) {
                        xResult = eventObj.results[i];
                        reResults.text=reResults.text + xResult.matchedIndex + " " + xResult.matchedString + "\n";
                    }
                } else {
                    reResults.text = "";
                }
            }
        ]]>
    </fx:Script>

    <fx:Declarations>
        <mx:RegExpValidator id="regExpV" 
                source="{regex_text}" property="text" 
                flags="g" expression="{regex.text}" 
                valid="handleResult(event)"
                invalid="handleResult(event)"
                trigger="{myButton}"
                triggerEvent="click"/>
    </fx:Declarations>

    <s:Panel title="RegExpValidator Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <s:VGroup left="10" right="10" top="10" bottom="10">
            <s:Label width="100%" text="Instructions:"/>
            <s:Label width="100%" text="1. Enter text to search. By default, enter  a string containing the letters ABC in sequence followed by any digit."/>
            <s:Label width="100%" text="2. Enter the regular expression. By default, enter ABC\d."/>
            <s:Label width="100%" text="3. Click the Button control to trigger the validation."/>
            <s:Label width="100%" text="4. The results show the index in the text where the matching pattern begins, and the matching pattern. "/>
            <mx:Form>
                <mx:FormItem label="Enter text:">
                    <s:TextInput id="regex_text" text="xxxxABC4xxx" width="100%"/>
                </mx:FormItem>
                <mx:FormItem label="Enter regular expression:">
                    <s:TextInput id="regex" text="ABC\d" width="100%"/>
                </mx:FormItem>
                <mx:FormItem label="Results:">
                    <s:TextInput id="reResults" width="100%"/>
                </mx:FormItem>
                <mx:FormItem >
                    <s:Button id="myButton" label="Validate"/>
                </mx:FormItem>
            </mx:Form>
        </s:VGroup>
    </s:Panel>

</s:Application>

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RegExpValidator - AS3 Flex

類別 x

expression

flags

noExpressionError

noMatchError

RegExpValidator

doValidation