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RadioButtonGroup  - AS3 Flex

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Istruzioni, parole chiave e direttive
Tipi speciali

Appendici

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Migrazione a ActionScript 3
Set di caratteri supportati
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Elementi XML di Motion
Tag Timed Text
Elenco degli elementi obsoleti
Costanti di implementazione dell’accessibilità
Utilizzare gli esempi ActionScript
Note legali
Pacchettospark.components
Classepublic class RadioButtonGroup
EreditarietàRadioButtonGroup Inheritance EventDispatcher Inheritance Object
Implementa IMXMLObject

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

The RadioButtonGroup component defines a group of RadioButton components that act as a single mutually exclusive component; therefore, a user can select only one RadioButton component at a time. The id property is required when you use the <s:RadioButtonGroup> tag to define the group name. Any <s:RadioButton> component added to this group will have this group name.

Notice that the RadioButtonGroup component is a subclass of EventDispatcher, not UIComponent, and implements the IMXMLObject interface. All other Flex visual components implement the IVisualElement interface. The RadioButtonGroup component declaration must be contained within the <Declarations> tag since it is not assignable to IVisualElement.

To use this component in a list-based component, such as a List or DataGrid, create an item renderer. For information about creating an item renderer, see Custom Spark item renderers.

Sintassi MXMLexpandedNascondi sintassi MXML

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

  <s:RadioButtonGroup
    Properties
    enabled="true"
    selectedValue="null"
    selection="null"
 
    Events
    change="No default"
    itemClick="No default"
    valueCommit="No default"
  />
  

Vedere gli esempi

Altri esempi

Elementi API correlati



Proprietà pubbliche
 ProprietàDefinito da
 Inheritedconstructor : Object
Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto.
Object
  enabled : Boolean
Determines whether selection is allowed.
RadioButtonGroup
  numRadioButtons : int
[sola lettura] The number of RadioButtons that belong to this RadioButtonGroup.
RadioButtonGroup
  selectedValue : Object
The value property of the selected RadioButton component in the group, if it has been set, otherwise, the label property of the selected RadioButton.
RadioButtonGroup
  selection : RadioButton
Contains a reference to the currently selected RadioButton component in the group.
RadioButtonGroup
Metodi pubblici
 MetodoDefinito da
  
Constructor.
RadioButtonGroup
 Inherited
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
 Inherited
Invia un evento nel flusso di eventi.
EventDispatcher
  
Returns the RadioButton component at the specified index.
RadioButtonGroup
 Inherited
Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento.
EventDispatcher
 Inherited
Indica se per un oggetto è definita una proprietà specifica.
Object
  
Implementation of the IMXMLObject.initialized() method to support deferred instantiation.
RadioButtonGroup
 Inherited
Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.
Object
 Inherited
Indica se la proprietà specificata esiste ed è enumerabile.
Object
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Rimuove un listener dall'oggetto EventDispatcher.
EventDispatcher
 Inherited
Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.
Object
 Inherited
Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.
Object
 Inherited
Restituisce la rappresentazione in formato stringa dell'oggetto specificato.
Object
 Inherited
Restituisce il valore di base dell'oggetto specificato.
Object
 Inherited
Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato.
EventDispatcher
Eventi
 Evento Riepilogo Definito da
 Inherited[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
  Dispatched when the value of the selected RadioButton component in this group changes.RadioButtonGroup
 Inherited[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR perde l'attivazione del sistema operativo e sta entrando nello stato inattivo.EventDispatcher
  Dispatched when a user selects a RadioButton component in the group.RadioButtonGroup
  Dispatched when values are changed programmatically or by user interaction.RadioButtonGroup
Descrizione delle proprietà

enabled

proprietà
enabled:Boolean

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Determines whether selection is allowed. Note that the value returned only reflects the value that was explicitly set on the RadioButtonGroup and does not reflect any values explicitly set on the individual RadioButtons.

Il valore predefinito è true.



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

numRadioButtons

proprietà 
numRadioButtons:int  [sola lettura]

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

The number of RadioButtons that belong to this RadioButtonGroup.

Il valore predefinito è "0".

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



Implementazione
    public function get numRadioButtons():int

selectedValue

proprietà 
selectedValue:Object

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

The value property of the selected RadioButton component in the group, if it has been set, otherwise, the label property of the selected RadioButton. If no RadioButton is selected, this property is null.

If you set selectedValue, Flex selects the first RadioButton component whose value or label property matches this value.

Il valore predefinito è null.

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



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

selection

proprietà 
selection:RadioButton

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Contains a reference to the currently selected RadioButton component in the group. You can access this property in ActionScript only; it is not settable in MXML. Setting this property to null deselects the currently selected RadioButton component. A change event is not dispatched.

Il valore predefinito è null.

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



Implementazione
    public function get selection():RadioButton
    public function set selection(value:RadioButton):void
Descrizione della funzione di costruzione

RadioButtonGroup

()Funzione di costruzione
public function RadioButtonGroup(document:IFlexDisplayObject = null)

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Constructor.

Parametri
document:IFlexDisplayObject (default = null) — In simple cases where a class extends EventDispatcher, the document parameter should not be used.

Elementi API correlati

Descrizione dei metodi

getRadioButtonAt

()metodo
public function getRadioButtonAt(index:int):RadioButton

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Returns the RadioButton component at the specified index.

Parametri

index:int — The 0-based index of the RadioButton in the RadioButtonGroup.

Restituisce
RadioButton — The specified RadioButton component if index is between 0 and numRadioButtons - 1. Returns null if the index is invalid.

Elementi API correlati

numRadioButtons

initialized

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

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Implementation of the IMXMLObject.initialized() method to support deferred instantiation.

Parametri

document:Object — The MXML document that created this object.
 
id:String — The identifier used by document to refer to this object. If the object is a deep property on document, id is null.

Elementi API correlati

Descrizione degli eventi

change

Evento
Tipo di oggetto evento: flash.events.Event
proprietà Event.type = flash.events.Event.CHANGE

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Dispatched when the value of the selected RadioButton component in this group changes.

La costante Event.CHANGE definisce il valore della proprietà type di un oggetto evento change.

Questo evento ha le seguenti proprietà:

ProprietàValore
bubblestrue
cancelablefalse; non è presente alcun comportamento predefinito da annullare.
currentTargetL'oggetto che elabora attivamente l'oggetto Event con un listener di eventi.
targetL'oggetto il cui valore è stato modificato. Il target non è sempre l'oggetto nell'elenco di visualizzazione che ha registrato il listener di eventi. Utilizzate la proprietà currentTarget per accedere all'oggetto dell'elenco di visualizzazione che sta elaborando l'evento.

itemClick

Evento  
Tipo di oggetto evento: mx.events.ItemClickEvent
proprietà ItemClickEvent.type = mx.events.ItemClickEvent.ITEM_CLICK

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Dispatched when a user selects a RadioButton component in the group. You can also set a handler for individual RadioButton components. This event is dispatched only when the user interacts with the radio buttons by using the mouse.

The ItemClickEvent.ITEM_CLICK constant defines the value of the type property of the event object for an itemClick event.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
currentTargetThe 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.
indexThe index of the navigation item that was clicked.
itemThe item in the data provider of the navigation item that was clicked.
labelThe label of the navigation item that was clicked.
relatedObjectThe child object that generated the event.
targetThe 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.

valueCommit

Evento  
Tipo di oggetto evento: mx.events.FlexEvent
proprietà FlexEvent.type = mx.events.FlexEvent.VALUE_COMMIT

Versione linguaggio: ActionScript 3.0
Versione prodotto: Flex 4
Versioni runtime: Flash Player 10, AIR 1.5

Dispatched when values are changed programmatically or by user interaction.

Because a programmatic change triggers this event, make sure that any valueCommit event handler does not change a value that causes another valueCommit event. For example, do not change theselectedValue property or selection property in a valueCommit event handler.

The FlexEvent.VALUE_COMMIT constant defines the value of the type property of the event object for a valueCommit event.

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
currentTargetThe 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.
targetThe 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.
RadioButtonGroupExample.mxml
<?xml version="1.0" encoding="utf-8"?>
<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.controls.Alert;
            import mx.events.ItemClickEvent;
            
            private function handlePayment(event:ItemClickEvent):void {
                if (event.currentTarget.selectedValue == "check") {
                    Alert.show("You opted to pay by check."); 
                } else if (event.currentTarget.selectedValue == "credit") {
                    Alert.show("You opted to pay by credit card.");
                }
            }
        ]]>
    </fx:Script>
    
    <fx:Declarations>
        <s:RadioButtonGroup id="paymentType" itemClick="handlePayment(event);"/>
    </fx:Declarations>
    <s:VGroup paddingLeft="10" paddingTop="10">
        <s:RadioButton groupName="paymentType" 
                       id="payCheck" 
                       value="check" 
                       label="Pay by check" 
                       width="150"/>
        <s:RadioButton groupName="paymentType" 
                       id="payCredit" 
                       value="credit" 
                       label="Pay by credit card" 
                       width="150"/>
    </s:VGroup>
</s:Application>




[ X ]Perché in inglese?
Il contenuto della Guida di riferimento di ActionScript 3.0 appare in inglese

Non tutte le parti della Guida di riferimento di ActionScript 3.0 sono tradotte in tutte le lingue. Quando un elemento del linguaggio non è tradotto, viene riportato in inglese. Ad esempio, la classe ga.controls.HelpBox non è tradotta in nessuna lingua. Pertanto, nella versione italiana della guida di riferimento, la descrizione della classe ga.controls.HelpBox è riportata in inglese.