将For循环与数组和addEventListener结合使用

Question

I have this map I'm creating in Flash. You click on a state, then you can click on an icon to view a tooltip/popup of some information. What I was trying to do was instead of creating new functions and event listeners for every different icon is to use a for loop...but it's not going so well. I haven't touched AS in a long time so bear with me :)

var ToolTipMC = map.toolTip;
ToolTipMC.alpha = 0;
var places:Array = new Array();

places = [ "map.paulsens", "map.plutonic", "map.jundee", "map.wiluna", "map.darlot", "map.lawers", "map.gwaliaDeeps", "map.sunriseDam", "map.marvelLoch" ];

function enableToolTips( event:MouseEvent ):void {
    ToolTipMC.x = places[ i ].x + 10;
    ToolTipMC.y = places[ i ].y - ( ToolTipMC.height - 9 );
    Tweener.addTween( ToolTipMC, { y: ToolTipMC.y + 5, alpha: 1, transition: "easeInOutExpo", time: 0.3 } );
    ToolTipMC.toolTipTextField.text = "It worked!";
    trace( "Mouse Over" );
}

function disableToolTips( event:MouseEvent ):void {
    Tweener.addTween( ToolTipMC, { alpha: 0, transition: "easeInOutExpo", time: 0.3 } );
    trace( "Mouse Out" );
}

for( var i:uint = 0; i < places.length; i++ ) {
    places[ i ].addEventListener( MouseEvent.MOUSE_OVER, enableToolTips );
    places[ i ].addEventListener( MouseEvent.MOUSE_OUT, disableToolTips );
}

The items in the array are instance names and I'm using the Tweener class(es).

The following throws an Output error of

TypeError: Error #1006: value is not a function

and is stopping at the

places[ i ].addEventListener( MouseEvent.MOUSE_OVER, enableToolTips );

So from this I can gather that it's having problems parsing the array values through to the event listener, but that's as far as I got :). Could anyone please help me with my dilema?

Answer 1

I see a few things that might be causing the problem:

1. Places are "strings", not IEventDispatchers
2. Not sure you can run a for-loop outside of a function, try wrapping it in a function.

Here's what it might look like.

function addListeners():void { for( var i:uint = 0; i < places.length; i++ ) { (places[ i ] as IEventDispatcher).addEventListener( MouseEvent.MOUSE_OVER, enableToolTips ); (places[ i ] as IEventDispatcher).addEventListener( MouseEvent.MOUSE_OUT, disableToolTips ); } }

You'd have to convert places to an Array of IEventDispatchers, maybe map items or whatever you're doing, some DisplayObject.

Hope that helps!

Answer 2

Following on from viatropos's answer - I assume you want to access the "place" with your tooltip that sent the event? You can do this using event.target :

function enableToolTips( event:MouseEvent ):void {
    var place:DisplayObject = DisplayObject(event.target);
    ToolTipMC.x = place.x + 10;
    ToolTipMC.y = place.y - ( ToolTipMC.height - 9 );

    //the rest of your function...
}

(I'm also guessing that your "places" are movieclips placed on the stage - hence the cast to DisplayObject )