I have created a bean class in action script using flash builder getters and setters method.
the class is :`
package default{
public class AccountBean
{
private var _username:String;
private var _email:String;
public function get username():String {
return _username;
}
public function set username(value:String):void {
_username = value;
}
public function get email():String {
return _email;
}
public function set email(value:String):void {
_email = value;
}
public function AccountBean() {
}
}
}
How to use set and get methods for this, is this creation of class is correct or not? please help
Yes, it's correct!
var bean:AccountBean = new AccountBean();
//using the setters
bean.username = "Whatever";
bean.email = "bean#whatever.com";
//using the getters
trace( bean.username , bean.email ); // Whatever bean#whatever.com
Related
First.mxml - Contains a Datefield control as follows:
<mx:DateField id="G2_CRTLoadDate" width="150" selectedDate="{modelProxy.G2_CRTLoadDate}" change="{modelProxy.G2_CRTLoadDate = event.currentTarget.selectedDate;changeManagerStatus()}"/>
I'm assigning this Datefield value to a static variable CERT_LOAD_DATE as follows(First.mxml):
[Bindable]
public static var CERT_LOAD_DATE:String = "";
private function changeManagerStatus():void
{
CERT_LOAD_DATE = G2_CRTLoadDate.selectedDate.toDateString();
}
Second.mxml -Here, I have a Combobox as follows:
<mx:ComboBox id="General_Release_Dates"
selectedItem="{modelProxy.General_Release_Dates}"
valueCommit="{model.General_Release_Dates = event.currentTarget.selectedItem;updateReleaseDate(event)}"
change="{model.General_Release_Dates = event.currentTarget.selectedItem;updateReleaseDate(event)}" close="closeHandler(event);" includeInLayout="true" visible="true">
</mx:ComboBox>
Inside the closeHandler function, I'm trying to access the variable CERT_LOAD_DATE as follows:
private function closeHandler(evt:DropdownEvent):void {
var CurrentDate:Date = new Date();
if(General_Release_Dates.selectedLabel.toString() == "TBD")
{
Alert.show(First.CERT_LOAD_DATE);
}
}
The alert box displays no value (null). Please help.
I can't figure out the relationship between First.mxml and Second.mxml from your question.
However, the following code can't access First.mxml.
Alert.show(First.CERT_LOAD_DATE);
Because the "First" is not the same instance as loaded "First.mxml".
How about to use singleton? It's accessible from anywhere.
1st, add MySingleton.as class like this.
package foo.bar
{
public class MySingleton
{
private var _cert_load_date:String;
public function MySingleton(internally:SingletonInternal)
{
super();
if(internally == null)
{
throw new Error("Please use getInstance() method.");
}
}
public static function getInstance():MySingleton
{
return SingletonInternal.instance;
}
public function set cert_load_date(value:String):void
{
_cert_load_date = value;
}
public function get cert_load_date():String
{
return _cert_load_date;
}
}
}
import foo.bar.MySingleton;
class SingletonInternal{
public static var instance:MySingleton
= new MySingleton(new SingletonInternal());
public function SingletonInternal(){}
}
How to use
Set value at First.mxml.
public var singleton: MySingleton = MySingleton.getInstance();
private function changeManagerStatus():void
{
singleton.cert_load_date = G2_CRTLoadDate.selectedDate.toDateString();
}
Second.mxml
public var singleton: MySingleton = MySingleton.getInstance();
private function closeHandler(evt:DropdownEvent):void {
var CurrentDate:Date = new Date();
if(General_Release_Dates.selectedLabel.toString() == "TBD")
{
Alert.show(singleton.cert_load_date);
}
}
Updated: Aug 27 10:00(JST)
I think there are two way to change First.mxml's element using singleton.
1) Binding the DateField value to singleton variables, and clear the value at Secend.mxml.
2) Assign to singleton variables whole "First", and control from Second.mxml.
I'll write here the 2nd way.
If you use this way, anything is controlable from Second.mxml.
MySingleton.as
private var _first:Object;
public function set first(value:Object):void
{
_first = value;
}
public function get first():Object
{
return _first;
}
First.mxml
singleton.first = this;
Second.mxml
public function something(): void{
First(singleton.first).G2_CRTLoadDate.selectedDate = null;
// The cast is unnecessary. Following code also works.
// singleton.first.G2_CRTLoadDate.selectedDate = null;
}
Also you can execute First.mxml's public function from Second.mxml.
singleton.first.someFunctionDefinedAtFirst();
public dynamic class TypedDictionary extends Dictionary {
private var _type:Class;
public function TypedDictionary(type:Class, weakKeys:Boolean = false) {
_type = type;
super(weakKeys);
}
public function addValue(key:Object, value:_type):void {
this[key] = value;
}
public function getValue(key:Object):_type{
return this[key];
}
...
I want to make TypedDictionary with typisation. But I can not use _type in addValue and getValue. The idea is to use next construction :
var td:TypedDictionary = new TypedDictionary(myClass, true);
td.addValue("first", new myClass());
...
var item:myClass = td.getValue("first");
item.someFunction();
Is any ability to use dynamic class type?
If I un derstand what you are asking for.
This is untested code so it could be error prone, but it should get you on the right path.
public dynamic class TypedDictionary extends Dictionary {
private var _type:Class;
public function TypedDictionary(type:String, weakKeys:Boolean = false) {
_type = getDefinitionByName(type) as Class;
super(weakKeys);
}
public function addValue(key:Object, value:*):void {
if(_type == getDefinitionByName(getQualifiedClassName(value))){
this[key] = value;
}else{
trace('failed type match')
}
}
public function getValue(key:Object):*{
return this[key];
}
...
var td:TypedDictionary = new TypedDictionary("com.somepackage.myClass", true);
td.addValue("first", new myClass());
var item:myClass = td.getValue("first");
item.someFunction();
I am trying to create a basic functionality in AS3.
I have a class like this:
package tax
{
public class Calculator
{
public function Calculator()
{
}
private var grwage:Number;
private var taxes:Number;
private var superannuation:Number;
private var insurance:Number;
private var net:Number;
public function getGrwage():Number {
return grwage;
}
public function setGrwage(grwage:Number):void {
this.grwage = grwage;
}
public function getTaxes():Number {
return grwage;
}
public function setTaxes(taxes:Number):void {
this.taxes = grwage * 0.2;
}
public function getSup():Number {
return superannuation;
}
public function setSup(superannuation:Number):void {
this.superannuation = superannuation * 0.05;
}
public function getIns():Number {
return insurance;
}
public function setIns(insurance:Number):void {
this.insurance = insurance * 0.1;
}
public function getNet():Number {
return net;
}
public function setNet(net:Number):void {
this.net = grwage - taxes - superannuation - insurance;
}
}
}
Just some getters and setters.
And in my mxml file:
import tax.Calculator;
public var calculate:Calculator = new Calculator();
calculate.setGrwage(1000);
trace(calculate.getTaxes());
trace(calculate.getSup());
trace(calculate.getIns());
trace(calculate.getNet());
I get an error 1120 Access to undefinded property when I try to access calculate. Do you have any ideas?
Thanks.
I guess you're mixing up things a bit between getters and setters. If a variable depends on another, you have to write the calculation in its getter. This variable shouldn't exist as a private member and the accesses to it must always be done through the appropriate getter.
for example:
public function getNet():Number {
return getGrwage() - getTaxes() - getSup() - getIns();
}
So here, you only need one setter (setGrwage), you can remove the others ones and put the calculation in the getters.
Note that there is a more appropriate syntax for setters and getters in AS3.
class GetSet
{
private var privateProperty:String;
public function get publicAccess():String
{
return privateProperty;
}
public function set publicAccess(setValue:String):void
{
privateProperty = setValue;
}
}
There are multiple issues with your class. So lets redesign it
The main issue you had was you were not initiating the vars before you accessed them as they had a NULL value the flash player was throwing you that error.
As you can see in the constructor I set a default value of 0 so that they will never be NULL.
package tax {
public class Calculator{
private var _grwage:Number;
private var _taxes:Number;
private var _superannuation:Number;
private var _insurance:Number;
public function Calculator() {
this._grwage = 0;
this._taxes = 0;
this._superannuation = 0;
this._insurance = 0;
}
public function get grwage():Number {
return this._grwage;
}
public function set grwage(val:Number):void {
this._grwage = val;
}
public function get taxes():Number {
return this._taxes;
}
public function set taxes(val:Number):void {
this._taxes = val * 0.2;
}
public function get superannuation():Number {
return this._superannuation;
}
public function set superannuation(val:Number):void {
this._superannuation = val * 0.05;
}
public function get insurance():Number {
return this._insurance;
}
public function set insurance(val:Number):void {
this._insurance = val* 0.1;
}
public function get net():Number {
return this._grwage - this._taxes - this._superannuation - this._insurance;
}
}
}
import tax.Calculator;
public var calculate:Calculator = new Calculator();
//Now due to the fact we are using true setter/getter methods.
calculate.grwage = 1000;
trace( calculate.taxes); // should be 0 as we are defaulting to the initial value
trace( calculate.superannuation );// should be 0 as we are defaulting to the initial value
trace( calculate.insurance );// should be 0 as we are defaulting to the initial value
trace( calculate.net );// should be 1000 as we are defaulting to the initial values of everything but grwage
The answers here are all good, but they all miss the primary point:
You're trying to get your variables before you set them.
import tax.Calculator;
public var calculate:Calculator = new Calculator();
calculate.setGrwage(1000);
trace(calculate.getTaxes());
trace(calculate.getSup());
trace(calculate.getIns());
trace(calculate.getNet());
This will throw an error (due to the way you've set up your class), because you never called setSup(), setIns(), and setNet() before trying to use them.
While your class may not be written in the best way, it is syntactically sound.
Try calling each setter before your getter. I think you'll solve your issue.
I need to increment an integer variable in a function within the document class upon transpiring event in another class. I can't seem to figure out how to call the function and reference the variable.
as3 newbie, please help!
The proper scope needs to be in place and the proper packaging.
Declare a static variable to handle your access to the Main Document Class
private static var _instance:Main;
public static function get instance():Main { return _instance; }
public function Main() { // constructor
_instance = this;
}
Declare some getters and setters in the Main Document Class
private var _foo:int = 0;
public function get foo():int{
return _foo;
}
public function set foo(value:int):void {
_foo= value;
}
And then in any class you need you can change to something as follows,
public class O {
public function O() {
Main.instance.set(Main.instance.get() + 1);
}
}
simple example, defining a variable 'test' in the document class:
package {
public class DocumentClass extends Sprite {
public static var test:Number = 3;
public function DocumentClass() {
test = 4;
}
}
}
now access the 'test' variable in another class:
package {
public class OtherClass extends Sprite {
public function OtherClass() {
DocumentClass.test = 5;
}
}
}
does this apply to your code?
I have created a custom even class which is pretty basic. But when calling an event and then relaying that event to another class I have encountered the "cannot transform thisEvent into thisOtherEvent" error.
I realize this is because I needed to override the Clone function in my custom event like so:
package com
{
import flash.disply.*;
import flash.events.Event;
public class MyCustomEvents extends Event
{
public static const SOME_EVENT:String = "some_event";
public var info:Object;
public function MyCustomEvents($type:String, $info:Object,$bubbles:Boolean = false, $cancelable:Boolean = false)
{
super($type, $bubbles, $cancelable);
this.info = $info;
}
public override function clone():Event {
return new MyCustomEvents($type, $bubbles, $cancelable);
}
}
}
However I am still getting this error when I dispatch the event. Anything else I might be missing?
here is the error:
TypeError: Error #1034: Type Coercion failed: cannot convert com.greensock.events::TransformEvent#d8df709 to com.customEvents.MyCustomEvents.
I tried casting the event in the code like so:
var deleteImgEvent:MyCustomEvent = new MyCustomEvent(MyCustomEvents.IMAGE_DELETE, {imgData: getImg}, true, false); this.dispatchEvent(deleteImgEvent as MyCustomEvents);
Still no luck.
UPDATE:
Ok, seems like the problem is in the greensock Transform library. When the event handler for my custom event is called, I run a function of the TransformManager class.
_manager.deleteSelection();
Inside that class it dispatched a TransformEvent. Not sure why, but it is reading that delete event as a MyCustomEvent.
/**
* #usage
* var myEvent:CustomEvent = new CustomEvent(CustomEvent.EVENT_TYPE_A, { integerRelatedToEvent: 5, stringRelatedToEvent: 'easy' });
* addEventListener(CustomEvent.EVENT_TYPE_A, traceCustomEvent);
* dispatch(myEvent);
* function traceCustomEvent ($e:CustomEvent):void {
* trace($e.type);
* }
*/
package {
import flash.events.Event;
public class CustomEvent extends Event {
// Types:
public static const EVENT_TYPE_A:String = 'CustomEvent.EVENT_TYPE_A';
public static const EVENT_TYPE_B:String = 'CustomEvent.EVENT_TYPE_B';
// Components:
private var _customDatum:Object;
public function get customDatum ():Object { return _customDatum; }
public function CustomEvent ($type:String, $customDatum:Object) {
super($type);
_customDatum = $customDatum;
}
public override function clone ():Event {
return new CustomEvent(type, _customDatum);
}
}
}
"When creating your own custom Event
class, you must override the inherited
Event.clone() method in order for it
to duplicate the properties of your
custom class. If you do not set all
the properties that you add in your
event subclass, those properties will
not have the correct values when
listeners handle the redispatched
event."
package com.events;
{
import flash.events.Event;
public class XMLLoaderEvent extends Event
{
public static const XML_LOADED:String = "XML_Loaded";
public var data:*;
public var properties:Object;
public function XMLLoaderEvent( type:String,_data:*,bubbles:Boolean = false,cancelable:Boolean = false):void
{
super( type, bubbles, cancelable );
data = _data;
}
// Override clone
override public function clone():Event
{
return new XMLLoaderEvent( type, data, bubbles, cancelable);
}
}
}
Don't know if that's it but you have an extra parameter $info:Object into your custom event, but you don't pass it in your clone contructor.
return new MyCustomEvents(type, info, bubbles, cancelable);
I think you need the clone function to return a MyCustomEvents type. Not an Event type. And you need to add the info parameter as stated by the previous poster.
package com {
import flash.display.*;
import flash.events.Event;
public class MyCustomEvents extends Event {
public static const SOME_EVENT:String = "some_event";
public var info:Object;
public function MyCustomEvents($type:String, $info:Object,$bubbles:Boolean = false, $cancelable:Boolean = false) {
super($type, $bubbles, $cancelable);
this.info = $info;
}
public override function clone():MyCustomEvents {
return new MyCustomEvents(this.type, this.info, this.bubbles, this.cancelable);
}
}
}