BindingUtils - API-referens för Adobe ActionScript® 3 (AS3 Flex)

Paket	mx.binding.utils
Klass	public class BindingUtils
Arv	BindingUtils Object

Språkversion:

ActionScript 3.0

Produktversion:

Flex 3

Körningsmiljöversioner:

Flash Player 9, AIR 1.1

The BindingUtils class defines utility methods for performing data binding from ActionScript. You can use the methods defined in this class to configure data bindings.

Fler exempel

About data binding
Defining data bindings in ActionScript

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	Egenskap		Definieras med
		constructor : Object En referens till klassobjektet eller konstruktorfunktionen för en given objektinstans.	Object

Publika metoder

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	Metod		Definieras med
		bindProperty(site:Object, prop:String, host:Object, chain:Object, commitOnly:Boolean = false, useWeakReference:Boolean = false):ChangeWatcher [statisk] Binds a public property, prop on the site Object, to a bindable property or property chain.	BindingUtils
		bindSetter(setter:Function, host:Object, chain:Object, commitOnly:Boolean = false, useWeakReference:Boolean = false):ChangeWatcher [statisk] Binds a setter function, setter, to a bindable property or property chain.	BindingUtils
		hasOwnProperty(name:String):Boolean Anger om det finns en egenskap angiven för ett objekt.	Object
		isPrototypeOf(theClass:Object):Boolean Anger om en instans av klassen Object finns i prototypkedjan för objektet som anges som parameter.	Object
		propertyIsEnumerable(name:String):Boolean Anger om den angivna egenskapen finns och är uppräkningsbar.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Anger tillgänglighet för en dynamisk egenskap för slingåtgärder.	Object
		toLocaleString():String Returnerar det här objektets strängrepresentation, formaterad i enlighet med språkspecifika konventioner.	Object
		toString():String Returnerar det angivna objektets strängbeteckning.	Object
		valueOf():Object Returnerar det angivna objektets primitiva värde.	Object

Metoddetaljer

bindProperty

()

metod

 public static function bindProperty(site:Object, prop:String, host:Object, chain:Object, commitOnly:Boolean = false, useWeakReference:Boolean = false):ChangeWatcher

Språkversion:

ActionScript 3.0

Produktversion:

Flex 3

Körningsmiljöversioner:

Flash Player 9, AIR 1.1

Binds a public property, prop on the site Object, to a bindable property or property chain. If a ChangeWatcher instance is successfully created, prop is initialized to the current value of chain.

Parametrar

	`site:Object` — The Object defining the property to be bound to `chain`.

	`prop:String` — The name of the public property defined in the `site` Object to be bound. The property will receive the current value of `chain`, when the value of `chain` changes.

	`host:Object` — The object that hosts the property or property chain to be watched. The `host` maintains a list of `sites` to update when `prop` changes.

	`chain:Object` — A value specifying the property or chain to be watched. Legal values are: String containing the name of a public bindable property of the host object. An Object in the form: `{ name: property name, getter: function(host) { return host[property name] } }`. This Object must contain the name of, and a getter function for, a public bindable property of the host object. A non-empty Array containing a combination of the first two options that represents a chain of bindable properties accessible from the host. For example, to bind the property `host.a.b.c`, call the method as: `bindProperty(site, prop, host, ["a","b","c"])`. Note: The property or properties named in the `chain` argument must be public, because the `describeType()` method suppresses all information about non-public properties, including the bindability metadata that ChangeWatcher scans to find the change events that are exposed for a given property. However, the getter function supplied when using the `{ name, getter }` argument form described above can be used to associate an arbitrary computed value with the named (public) property.

	`commitOnly:Boolean` (default = `false`) — Set to `true` if the handler should be called only on committing change events; set to `false` if the handler should be called on both committing and non-committing change events. Note: the presence of non-committing change events for a property is indicated by the `[NonCommittingChangeEvent(<event-name>)]` metadata tag. Typically these tags are used to indicate fine-grained value changes, such as modifications in a text field prior to confirmation.

	`useWeakReference:Boolean` (default = `false`) — Determines whether the reference to `site` is strong or weak. A strong reference (the default) prevents `site` from being garbage-collected. A weak reference does not. Added for Flex 4.

Returnerar

ChangeWatcher — A ChangeWatcher instance, if at least one property name has been specified to the chain argument; null otherwise.

bindSetter

()

metod

 public static function bindSetter(setter:Function, host:Object, chain:Object, commitOnly:Boolean = false, useWeakReference:Boolean = false):ChangeWatcher

Språkversion:

ActionScript 3.0

Produktversion:

Flex 3

Körningsmiljöversioner:

Flash Player 9, AIR 1.1

Binds a setter function, setter, to a bindable property or property chain. If a ChangeWatcher instance is successfully created, the setter function is invoked. The setter must have the following function signature:

      function mySetterFunction(object:Object):void {
          //Do whatever you want with the value of the bound property.
      }

where object contains the current value of chain.

Parametrar

	`setter:Function` — Setter method to invoke with an argument of the current value of `chain` when that value changes.

	`host:Object` — The host of the property. See the `bindProperty()` method for more information. The `host` maintains a list of `setters` to update when `prop` changes.

	`chain:Object` — The name of the property, or property chain. See the `bindProperty()` method for more information.

	`commitOnly:Boolean` (default = `false`) — Set to `true` if the handler should be called only on committing change events. See the `bindProperty()` method for more information.

	`useWeakReference:Boolean` (default = `false`) — Determines whether the reference to `setter` is strong or weak. A strong reference (the default) prevents `setter` from being garbage-collected. A weak reference does not. Added for Flex 4.

Returnerar

ChangeWatcher — A ChangeWatcher instance, if at least one property name has been specified to the chain argument; null otherwise.

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BindingUtils - AS3 Flex

Klasser x

bindProperty

bindSetter