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88 lines
2.6 KiB
Markdown
88 lines
2.6 KiB
Markdown
# Events & Animation
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## Events
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Event Types:
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- **Mouse Events**: `mousedown`, `mouseup`, `click`, `dbclick`, `mousemove`, `mouseover`, `mousewheel`, `mouseout`, `contextmenu`, ...
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- **Touch Events**: `touchstart`, `touchmove`, `touchend`, `touchcancel`, ...
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- **Keyboard Events**: `keydown`, `keypress`, `keyup`, ...
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- **Form Events**: `focus`, `blur`, `change`, `submit`, ...
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- **Window Events**: `scroll`, `resize`, `hashchange`, `load`, `unload`, ...
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### Managing Event Listeners
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```js
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var domNode = document.getElementById("id");
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var onEvent = function(event) { // parameter contains info on the triggered event
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event.preventDefault(); // block execution of default action
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// logic here
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}
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domNode.addEventListener(eventType, callback);
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domNode.removeEventListener(eventType, callback);
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```
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### Bubbling & Capturing
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Events in Javascript propagate through the DOM tree.
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[Bubbling and Capturing](https://javascript.info/bubbling-and-capturing)
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[What Is Event Bubbling in JavaScript? Event Propagation Explained](https://www.sitepoint.com/event-bubbling-javascript/)
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### Dispatching Custom Events
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Event Options:
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- `bubbles` (bool): whether the event propagates through bubbling
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- `cancellable` (bool): if `true` the "default action" may be prevented
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```js
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let event = new Event(type [,options]); // create the event, type can be custom
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let event = new CustomEvent(type, { detail: /* custom data */ }); // create event w/ custom data
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domNode.dispatchEvent(event); // launch the event
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```
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## Animation
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The window object is the assumed global object on a page.
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Animation in JavascriptThe standard way to animate in JS is to use window methods.
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It's possible to animate CSS styles to change size, transparency, position, color, etc.
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```js
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//Calls a function once after a delay
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window.setTimeout(callbackFunction, delayMilliseconds);
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//Calls a function repeatedly, with specified interval between each call
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window.setInterval(callbackFunction, delayMilliseconds);
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//To stop an animation store the timer into a variable and clear it
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window.clearTimeout(timer);
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window.clearInterval(timer);
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// execute a callback at each frame
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window.requestAnimationFrame(callbackFunction);
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```
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### Element Position & dimensions
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[StackOverflow](https://stackoverflow.com/a/294273/8319610)
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[Wrong dimensions at runtime](https://stackoverflow.com/a/46772849/8319610)
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```js
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> console.log(document.getElementById('id').getBoundingClientRect());
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DOMRect {
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bottom: 177,
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height: 54.7,
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left: 278.5,
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right: 909.5,
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top: 122.3,
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width: 631,
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x: 278.5,
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y: 122.3,
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}
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```
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