Sprite can't exist in two groups?

[ritzbitz01]

In my game I am tracking all player ships as well as all selected ships, which will be a subset of all player ships.  I add the ship to the allShips list, then add it to the selectedShip list when selected.  After adding it to the second group it seems to be removed from the first group.  Is this intended behavior?
 
Example:

function create() {    game.physics.startSystem(Phaser.Physics.ARCADE);    game.world.setBounds(0, 0, 800, 600);    this.game.stage.backgroundColor = '#71c5cf';    firstgroup = game.add.group();    secondgroup = game.add.group();    // Add the test fighter    testFighter = game.add.sprite(400,200, 'yellowship');    firstgroup.add(testFighter);    console.log('FIRST GROUP LENGTH BEFORE ADDING TO SECOND GROUP: ' + firstgroup.length);    secondgroup.add(testFighter);    console.log('FIRST GROUP LENGTH AFTER ADDING TO SECOND GROUP: ' + firstgroup.length);}

Console output:

 

"FIRST GROUP LENGTH BEFORE ADDING TO SECOND GROUP: 1"

"FIRST GROUP LENGTH AFTER ADDING TO SECOND GROUP: 0"

 

Thanks!

[rich]

Yes, that's intended behaviour. Groups are display list level containers, not object data level, and a Sprite cannot exist in two containers at once (well it can via nesting, but it only has 1 actual parent).

[Elgan]

i like groups, like OP, i nearly forgot about arrays! use them,

I think a container like groups thats actually an array with useful members, would be useful, 

member-add, remove, etc

There must be a JS container , even though it's very easy to use arrays ;D

[ritzbitz01]

This is my first time using javascript, so still learning.  Arrays are super easy to use, and that is what I will use for the selected group.  Was hoping to take advantage of everything the group construct provided, but that's ok, arrays are pretty versatile as well!

 

Thanks!

[bazoo]

This works for me:
 

function create() {    game.physics.startSystem(Phaser.Physics.ARCADE);    game.world.setBounds(0, 0, 800, 600);    this.game.stage.backgroundColor = '#71c5cf';        // First group    firstgroup = game.add.group();    firstgroup.createMultiple(1, 'yellowship');        // Display sprite from First Group    fgSprite = firstgroup.getFirstExists(false);    fgSprite.reset(400, 200);        // Console test #1    console.log(        'FIRST GROUP LENGTH BEFORE ADDING TO SECOND GROUP: ' + firstgroup.length    );                        // Second group    secondgroup = game.add.group();    secondgroup.createMultiple(1, 'yellowship');                // Display sprite from Second Group    sgSprite = secondgroup.getFirstExists(false);    sgSprite.reset(400, 200);        // Console test #2    console.log(        'FIRST GROUP LENGTH AFTER ADDING TO SECOND GROUP: ' + firstgroup.length    );}

Console output:

 

FIRST GROUP LENGTH BEFORE ADDING TO SECOND GROUP: 1

FIRST GROUP LENGTH AFTER ADDING TO SECOND GROUP: 1