Validator

Pacchetto	mx.validators
Classe	public class Validator
Ereditarietà	Validator EventDispatcher Object
Implementa	IMXMLObject, IValidator
Sottoclassi	CreditCardValidator, CurrencyValidator, DateValidator, EmailValidator, MultiTriggerValidator, MultiTriggerValidator, NumberValidator, PhoneNumberValidator, RegExpValidator, SocialSecurityValidator, StringValidator, StyleValidator, ZipCodeValidator

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

The Validator class is the base class for all Flex validators. This class implements the ability for a validator to make a field required, which means that the user must enter a value in the field or the validation fails.

Sintassi MXML expanded

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The Validator class defines the following tag attributes, which all of its subclasses inherit:

  <mx:Validator 
    enabled="true|false" 
    listener="Value of the source property" 
    property="No default" 
    required="true|false" 
    requiredFieldError="This field is required." 
    source="No default" 
    trigger="Value of the source property" 
    triggerEvent="valueCommit" 
  />

Vedere gli esempi

Altri esempi

Using error tips
Validating data by using custom validators
Example: Creating a simple validator

Elementi API correlati

mx.events.ValidationResultEvent
mx.validators.ValidationResult
mx.validators.RegExpValidationResult

Proprietà pubbliche

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	Proprietà		Definito da
		constructor : Object Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto.	Object
		enabled : Boolean Setting this value to false will stop the validator from performing validation.	Validator
		listener : Object Specifies the validation listener.	Validator
		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

Proprietà protette

	Proprietà		Definito da
		actualListeners : Array [sola lettura] Contains an Array of listener objects, if any, or the source object.	Validator
		actualTrigger : IEventDispatcher [sola lettura] Contains the trigger object, if any, or the source object.	Validator
		resourceManager : IResourceManager [sola lettura] 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

Metodi pubblici

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	Metodo		Definito da
		Validator() Constructor.	Validator
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registra un oggetto listener di eventi con un oggetto EventDispatcher, in modo che il listener riceva la notifica di un evento.	EventDispatcher
		dispatchEvent(event:Event):Boolean Invia un evento nel flusso di eventi.	EventDispatcher
		hasEventListener(type:String):Boolean Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	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 Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se la proprietà specificata esiste ed è enumerabile.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Rimuove un listener dall'oggetto EventDispatcher.	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		toLocaleString():String Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.	Object
		toString():String Restituisce la rappresentazione in formato stringa dell'oggetto specificato.	Object
		validate(value:Object = null, suppressEvents:Boolean = false):ValidationResultEvent Performs validation and optionally notifies the listeners of the result.	Validator
		validateAll(validators:Array):Array [statico] Invokes all the validators in the validators Array.	Validator
		valueOf():Object Restituisce il valore di base dell'oggetto specificato.	Object
		willTrigger(type:String):Boolean Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato.	EventDispatcher

Metodi protetti

	Metodo		Definito da
		addListenerHandler():void Sets up all of the listeners for the valid and invalid events dispatched from the validator.	Validator
		doValidation(value:Object):Array Executes the validation logic of this validator, including validating that a missing or empty value causes a validation error as defined by the value of the required property.	Validator
		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

Eventi

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	Riepilogo	Definito da
activate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR ottiene lo stato di attivazione del sistema operativo ed entra nello stato attivo.	EventDispatcher
deactivate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR perde l'attivazione del sistema operativo e sta entrando nello stato inattivo.	EventDispatcher
invalid	Dispatched when validation fails.	Validator
valid	Dispatched when validation succeeds.	Validator

Costanti protette

	Costante		Definito da
		DECIMAL_DIGITS : String = "0123456789" [statico] A String containing the decimal digits 0 through 9.	Validator
		ROMAN_LETTERS : String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" [statico] A string containing the upper- and lower-case letters of the Roman alphabet ("A" through "Z" and "a" through "z").	Validator

Descrizione delle proprietà

actualListeners

proprietà

actualListeners:Array [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Contains an Array of listener objects, if any, or the source object. Used to determine which object to notify about the validation result.

Implementazione
protected function get actualListeners():Array

actualTrigger

proprietà

actualTrigger:IEventDispatcher [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Contains the trigger object, if any, or the source object. Used to determine the listener object for the triggerEvent.

Implementazione
protected function get actualTrigger():IEventDispatcher

enabled

proprietà

enabled:Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Setting this value to false will stop the validator from performing validation. When a validator is disabled, it dispatch no events, and the validate() method returns null.

Il valore predefinito è true.

Implementazione
public function get enabled():Boolean
public function set enabled(value:Boolean):void

listener

proprietà

listener:Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Specifies the validation listener.

If you do not specify a listener, Flex uses the value of the source property. After Flex determines the source component, it changes the border color of the component, displays an error message for a failure, or hides any existing error message for a successful validation.

Implementazione
public function get listener():Object
public function set listener(value:Object):void

property

proprietà

property:String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A String specifying the name of the property of the source object that contains the value to validate. The property is optional, but if you specify source, you should set a value for this property as well.

Il valore predefinito è null.

Implementazione
public function get property():String
public function set property(value:String):void

required

proprietà

public var required:Boolean = true

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

If true, specifies that a missing or empty value causes a validation error.

Il valore predefinito è true.

requiredFieldError

proprietà

requiredFieldError:String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Error message when a value is missing and the required property is true.

Il valore predefinito è "This field is required.".

Implementazione
public function get requiredFieldError():String
public function set requiredFieldError(value:String):void

resourceManager

proprietà

resourceManager:IResourceManager [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A reference to the object which manages all of the application's localized resources. This is a singleton instance which implements the IResourceManager interface.

Questa proprietà può essere utilizzata come origine per l’associazione di dati. Quando questa proprietà viene modificata, invia l’evento unused .

Implementazione
protected function get resourceManager():IResourceManager

source

proprietà

source:Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Specifies the object containing the property to validate. Set this to an instance of a component or a data model. You use data binding syntax in MXML to specify the value. This property supports dot-delimited Strings for specifying nested properties. If you specify a value to the source property, then you should specify a value to the property property as well. The source property is optional.

Il valore predefinito è null.

Implementazione
public function get source():Object
public function set source(value:Object):void

subFields

proprietà

protected var subFields:Array

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

An Array of Strings containing the names for the properties contained in the value Object passed to the validate() method. For example, CreditCardValidator sets this property to [ "cardNumber", "cardType" ]. This value means that the value Object passed to the validate() method should contain a cardNumber and a cardType property.

Subclasses of the Validator class that validate multiple data fields (like CreditCardValidator and DateValidator) should assign this property in their constructor.

trigger

proprietà

trigger:IEventDispatcher

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Specifies the component generating the event that triggers the validator. If omitted, by default Flex uses the value of the source property. When the trigger dispatches a triggerEvent, validation executes.

Implementazione
public function get trigger():IEventDispatcher
public function set trigger(value:IEventDispatcher):void

triggerEvent

proprietà

triggerEvent:String

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Specifies the event that triggers the validation. If omitted, Flex uses the valueCommit event. Flex dispatches the valueCommit event when a user completes data entry into a control. Usually this is when the user removes focus from the component, or when a property value is changed programmatically. If you want a validator to ignore all events, set triggerEvent to the empty string ("").

Implementazione
public function get triggerEvent():String
public function set triggerEvent(value:String):void

Descrizione della funzione di costruzione

()

Funzione di costruzione

public function Validator()

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Constructor.

Descrizione dei metodi

addListenerHandler

()

metodo

protected function addListenerHandler():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Sets up all of the listeners for the valid and invalid events dispatched from the validator. Subclasses of the Validator class should first call the removeListenerHandler() method, and then the addListenerHandler() method if the value of one of their listeners or sources changes. The CreditCardValidator and DateValidator classes use this function internally.

doValidation

()

metodo

protected function doValidation(value:Object):Array

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Executes the validation logic of this validator, including validating that a missing or empty value causes a validation error as defined by the value of the required property.

If you create a subclass of a validator class, you must override this method.

Parametri

value:Object — Value to validate.

Restituisce

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

Altri esempi

About overriding the doValidation() method

Elementi API correlati

mx.validators.ValidationResult

getValueFromSource

()

metodo

protected function getValueFromSource():Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns the Object to validate. Subclasses, such as the CreditCardValidator and DateValidator classes, override this method because they need to access the values from multiple subfields.

Restituisce

Object — The Object to validate.

handleResults

()

metodo

protected function handleResults(errorResults:Array):ValidationResultEvent

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns a ValidationResultEvent from the Array of error results. Internally, this function takes the results from the doValidation() method and puts it into a ValidationResultEvent object. Subclasses, such as the RegExpValidator class, should override this function if they output a subclass of ValidationResultEvent objects, such as the RegExpValidationResult objects, and needs to populate the object with additional information. You never call this function directly, and you should rarely override it.

Parametri

errorResults:Array — Array of ValidationResult objects.

Restituisce

ValidationResultEvent — The ValidationResultEvent returned by the validate() method.

initialized

()

metodo

public function initialized(document:Object, id:String):void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Called automatically by the MXML compiler when the Validator is created using an MXML tag.

Parametri

	`document:Object` — The MXML document containing this Validator.

	`id:String` — Ignored.

isRealValue

()

metodo

protected function isRealValue(value:Object):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Returns true if value is not null.

Parametri

value:Object — The value to test.

Restituisce

Boolean — true if value is not null.

removeListenerHandler

()

metodo

protected function removeListenerHandler():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Disconnects all of the listeners for the valid and invalid events dispatched from the validator. Subclasses should first call the removeListenerHandler() method and then the addListenerHandler method if the value of one of their listeners or sources changes. The CreditCardValidator and DateValidator classes use this function internally.

resourcesChanged

()

metodo

protected function resourcesChanged():void

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

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.

This event will be dispatched when you set the ResourceManager's localeChain property, when a resource module has finished loading, and when you call the ResourceManager's update() method.

Subclasses should override this method and, after calling super.resourcesChanged(), do whatever is appropriate in response to having new resource values.

validate

()

metodo

public function validate(value:Object = null, suppressEvents:Boolean = false):ValidationResultEvent

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Performs validation and optionally notifies the listeners of the result.

Parametri

	`value:Object` (default = `null`) — Optional value to validate. If null, then the validator uses the `source` and `property` properties to determine the value. If you specify this argument, you should also set the `listener` property to specify the target component for any validation error messages.

	`suppressEvents:Boolean` (default = `false`) — If `false`, then after validation, the validator will notify the listener of the result.

Restituisce

ValidationResultEvent — A ValidationResultEvent object containing the results of the validation. For a successful validation, the ValidationResultEvent.results Array property is empty. For a validation failure, the ValidationResultEvent.results Array property contains one ValidationResult object for each field checked by the validator, both for fields that failed the validation and for fields that passed. Examine the ValidationResult.isError property to determine if the field passed or failed the validation.

Elementi API correlati

mx.events.ValidationResultEvent
mx.validators.ValidationResult

validateAll

()

metodo

public static function validateAll(validators:Array):Array

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Invokes all the validators in the validators Array. Returns an Array containing one ValidationResultEvent object for each validator that failed. Returns an empty Array if all validators succeed.

Parametri

validators:Array — An Array containing the Validator objects to execute.

Restituisce

Array — Array of ValidationResultEvent objects, where the Array contains one ValidationResultEvent object for each validator that failed. The Array is empty if all validators succeed.

Descrizione degli eventi

invalid

Evento

Tipo di oggetto evento: mx.events.ValidationResultEvent
proprietà ValidationResultEvent.type = mx.events.ValidationResultEvent.INVALID

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Dispatched when validation fails.

The ValidationResultEvent.INVALID constant defines the value of the type property of the event object for an invalid event. The value of this constant is "invalid".

The properties of the event object have the following values:

Property	Value
`bubbles`	false
`cancelable`	false
`currentTarget`	The Object that defines the event listener that handles the event. For example, if you use `myButton.addEventListener()` to register an event listener, myButton is the value of the `currentTarget`.
`field`	The name of the field that failed validation.
`message`	A single string that contains every error message from all of the ValidationResult objects in the results Array.
`results`	An array of ValidationResult objects, one per validated field.
`target`	The Object that dispatched the event; it is not always the Object listening for the event. Use the `currentTarget` property to always access the Object listening for the event.

valid

Evento

Tipo di oggetto evento: mx.events.ValidationResultEvent
proprietà ValidationResultEvent.type = mx.events.ValidationResultEvent.VALID

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

Dispatched when validation succeeds.

The ValidationResultEvent.VALID constant defines the value of the type property of the event object for a validevent. The value of this constant is "valid".

The properties of the event object have the following values:

Property	Value
`bubbles`	false
`cancelable`	false
`currentTarget`	The Object that defines the event listener that handles the event. For example, if you use `myButton.addEventListener()` to register an event listener, myButton is the value of the `currentTarget`.
`field`	An empty String.
`message`	An empty String.
`results`	An empty Array.
`target`	The Object that dispatched the event; it is not always the Object listening for the event. Use the `currentTarget` property to always access the Object listening for the event.

Descrizione delle costanti

DECIMAL_DIGITS

Costante

protected static const DECIMAL_DIGITS:String = "0123456789"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A String containing the decimal digits 0 through 9.

ROMAN_LETTERS

Costante

protected static const ROMAN_LETTERS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

Flex 3

Versioni runtime:

Flash Player 9, AIR 1.1

A string containing the upper- and lower-case letters of the Roman alphabet ("A" through "Z" and "a" through "z").

Esempi Come utilizzare questo esempio

SimpleValidatorExample.mxml

<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the Validator class. -->
<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 necessary classes.
            import mx.controls.Alert;
            import mx.events.ValidationResultEvent;
            
            // Event listener for the valid and invalid events.
            private function handleValid(evt:ValidationResultEvent):void {
                if (evt.type == ValidationResultEvent.VALID) {
                    // Enable Submit button.
                    submitButton.enabled = true;
                } else {
                    submitButton.enabled = false;
                }
            }

            // Submit form is everything is valid. 
            private function submitForm():void {
                Alert.show("Form Submitted!");
            }
        ]]>
    </fx:Script>

    <fx:Declarations>
        <!-- The Validator class defines the required property and the validator events
             used by all validator subclasses. -->
        <mx:Validator id="reqValid" required="true"
                source="{fname}" property="text" 
                valid="handleValid(event)"
                invalid="handleValid(event);" />
    </fx:Declarations>

    <s:Panel title="Validator Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <mx:Form left="10" right="10" top="10" bottom="10">
            <mx:FormItem>
                <mx:Text width="100%" color="blue"
                        text="Enter a value in the Name field before you can submit. The E-mail field is optional."/>
            </mx:FormItem>
            <mx:FormItem label="Name: " required="true">
                <mx:TextInput id="fname" width="100%"/>
            </mx:FormItem>
            <mx:FormItem label="E-mail address: " required="false">
                <mx:TextInput id="email" width="100%"/>
            </mx:FormItem>
            <mx:FormItem>
                <mx:Button id="submitButton" enabled="false" 
                        label="Submit" click="submitForm();"/>
            </mx:FormItem>
        </mx:Form>
    </s:Panel>

</s:Application>

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Validator - AS3 Flex

Classi x

actualListeners

actualTrigger

enabled

listener

property

required

requiredFieldError

resourceManager

source

subFields

trigger

triggerEvent

Validator

addListenerHandler

doValidation

getValueFromSource

handleResults

initialized

isRealValue

removeListenerHandler

resourcesChanged

validate

validateAll

invalid

valid

DECIMAL_DIGITS

ROMAN_LETTERS