8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
### observeMutations
|
|
|
|
Returns a new MutationObserver and runs the provided callback for each mutation on the specified element.
|
|
|
|
Use a [`MutationObserver`](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) to observe mutations on the given element.
|
|
Use `Array.prototype.forEach()` to run the callback for each mutation that is observed.
|
|
Omit the third argument, `options`, to use the default [options](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver#MutationObserverInit) (all `true`).
|
|
|
|
```js
|
|
const observeMutations = (element, callback, options) => {
|
|
const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));
|
|
observer.observe(
|
|
element,
|
|
Object.assign(
|
|
{
|
|
childList: true,
|
|
attributes: true,
|
|
attributeOldValue: true,
|
|
characterData: true,
|
|
characterDataOldValue: true,
|
|
subtree: true
|
|
},
|
|
options
|
|
)
|
|
);
|
|
return observer;
|
|
};
|
|
```
|
|
|
|
```js
|
|
const obs = observeMutations(document, console.log); // Logs all mutations that happen on the page
|
|
obs.disconnect(); // Disconnects the observer and stops logging mutations on the page
|
|
```
|