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# deck.events.js
An extension for [deck.js][] allowing you to execute Javascript when a
slide becomes/leaves the current, next, or previous slide.
## Requirements
[deck.js][]
## Events
Each event is triggered "on" the slide on which the event occurs (see _Example_)
and given a single argument -- the direction (see _Direction_)
* **deck.becameCurrent**: Triggered when a slide becomes the current one
(`to` in `deck.change`).
* **deck.lostCurrent**: The slide is no longer "current"
(`from` in `deck.change`).
* **deck.becamePrevious**: The slide (by order) just before the current slide.
(`to - 1` in `deck.change`).
* **deck.becameNext**: The slide (by order) just after the current slide.
(`to + 1` in `deck.change`).
* **deck.lostPrevious**: The slide (by order) just before the last current slide.
(`from - 1` in `deck.change`).
* **deck.lostNext**: The slide (by order) just after the last current slide.
(`from + 1` in `deck.change`).
## Direction
Each event is given a direction that helps determine whether the user is
moving forward or backward in the slide stack. It is provided as an argument
for the event and can be either `forward` or `reverse`. Essentially:
```
if(from < to){
direction = "forward";
}
else{
direction = "reverse";
}
```
## Example
If you put a placeholder slide `<div id="showGraph" class="slide"></div>` into
your source, this event will display a Javascript graph when you visit the
slide (forward) and remove it if you hit the back arrow and return to
the slide.
```
$("#showGraph").bind('deck.becameCurrent', function(ev, direction) {
if(direction == "forward"){
animateGraphIn();
}
else{
animateGraphOut();
}
});
```
[deck.js]: https://github.com/imakewebthings/deck.js
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