Sort Cards

Hey there,
I want to make a Card game with Phaser in which you have to sort Cards according to historical events. But I have some Problems with the sorting Part in that. At first I try with 7 dropzones. Somehow I need to give a number to every card and connect that with the place of the dropzone it is dropped on. But I’m out of options how to do that. Would be great if somebody can help with that

Maybe try having an event fire whenever the card is added to the dropzone, and use the event to add data to that card which could be the number of the dropzone. You could also add data to the card before it’s dropped in.
http://labs.phaser.io/index.html?dir=components/data/&q=