Question

我将如何为数组对象添加addEventListener。

我试图避免每隔x毫秒运行一个计时器来检查数组对象中的新元素，而不是在检测到新元素处理它们并将其删除时尝试触发事件。

阵列可以吗？也许ArrayCollections？要么就好了。

P.S.＆GT;这是 Flash 问题不 javascript

Answer 1

为什么不创建自己的数组类来扩展Array并实现IEventDispatcher，重写push（）函数并让它在调用函数时调度一个事件？

类似于：

package
{
    import flash.events.EventDispatcher;
    import flash.events.IEventDispatcher;

    public class MyArray extends Array implements IEventDispatcher
    {
        public static var ARRAY_PUSHED:String = "MYARRAY_ARRAY_PUSHED";

        private var dispatcher:EventDispatcher;

        public function MyArray(...parameters)
        {
            super(parameters);
            dispatcher = new EventDispatcher(this);
        }

        override public function push(...parameters):uint
        {
            dispatchEvent(ARRAY_PUSHED);
            super.push(parameters);
        }

        public function addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int=0, useWeakReference:Boolean=false):void
        {
            dispatcher.addEventListener(type, listener, useCapture, priority);
        }
        public function dispatchEvent(e:Event):Boolean
        {
            return dispatcher.dispatchEvent(e);
        }
        public function hasEventListener(type:String):Boolean
        {
            return dispatcher.hasEventListener(type);
        }
        public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void
        {
            dispatcher.removeEventListener(type, listener, useCapture);
        }
        public function willTrigger(type:String):Boolean
        {
            return dispatcher.willTrigger(type);
        }
    }
}

Answer 2

如何扩展Array.prototype.push方法？从How to extend Array.prototype.push()?

中被盗

Array.prototype.push=(function(){
    var original = Array.prototype.push;
    return function() {
        //Do what you want here.
        return original.apply(this,arguments);
    };
})();

在内部函数体中抛出您想要的任何代码。

Answer 3

发现

 AS3 override function push(...args):uint
    {
        for (var i:* in args)
        {
            if (!(args[i] is dataType))
            {
                args.splice(i,1);
            }
        }
        return (super.push.apply(this, args));
    }

与meder的帮助

Answer 4

   private var myArray:Array;

   private function addToArray(element:Object):void
   {
        myArray.push(element);
        dispatch( new Event("Element added));
   }

或在静态函数中，如果你想从另一个类中调用它

   public static function addToArray( array:Array , element:Object , dispatcher:EventDispatcher):Array
   {
       array.push(element);
       dispatcher.dispatch( new Event('Added Element') );
       return array;
   }

实施实际上取决于您的环境。

如何为Array推送事件？ [闪]

4 个答案: