stoplight-event-exercise/README.md

# Stoplight Exercise

As always, fork and clone this repository.

![](stoplight.gif)

## Part 1

Add DOM event listeners and handlers to toggle the on/off state of three bulbs.

- When a user clicks on the "Stop" button, toggle the [stop bulb's color][stop-color].
- When a user clicks on the "Slow" button, toggle the [slow bulb's color][slow-color].
- When a user clicks on the "Go" button, toggle the [go bulb's color][go-color].

**TIP**: All three bulbs can be on/off independently of one another.

### Resources

- [MDN - `Document.querySelector()`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector)
- [MDN - `EventTarget.addEventListener()`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
- [MDN - `click`](https://developer.mozilla.org/en-US/docs/Web/Events/click)
- [MDN -  `Element.classList`](https://developer.mozilla.org/en-US/docs/Web/API/Element/classList)

## Part 2

Add new DOM event listeners and handlers to log the mouse state of each button.

- When a user's mouse enters a button, log `"Entered <textContent> button"` to the console.
- When a user's mouse leaves a button, log `"Left <textContent> button"` to the console.

**TIP:** Each event type will need a separate event listener.

### Resources

- [MDN - `mouseenter`](https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter)
- [MDN - `mouseleave`](https://developer.mozilla.org/en-US/docs/Web/Events/mouseleave)
- [MDN - `Event.target`](https://developer.mozilla.org/en-US/docs/Web/API/Event/target)

## Bonus

Add **one** DOM event listener and **one** handler to log the state of each bulb.

- When a user clicks a button that just turned on, log`"<textContent> bulb on"` to the console.
- When a user clicks a button that just turned off, log`"<textContent> bulb off"` to the console.

**TIP:** A click on only a button should cause a message to be logged to the console.

### Resources

- [How JavaScript Event Delegation Works](https://davidwalsh.name/event-delegate)

[stop-color]: https://github.com/gSchool/stoplight-event-exercise/blob/master/index.css#L39
[slow-color]: https://github.com/gSchool/stoplight-event-exercise/blob/master/index.css#L43
[go-color]: https://github.com/gSchool/stoplight-event-exercise/blob/master/index.css#L47