happy-dom-without-node
Version:
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.
138 lines • 7.12 kB
JavaScript
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
if (kind === "m") throw new TypeError("Private method is not writable");
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};
var _MutationObserver_callback, _MutationObserver_listeners, _MutationObserver_window;
import * as PropertySymbol from '../PropertySymbol.js';
import MutationListener from './MutationListener.js';
/**
* The MutationObserver interface provides the ability to watch for changes being made to the DOM tree.
*
* @see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
*/
class MutationObserver {
/**
* Constructor.
*
* @param callback Callback.
*/
constructor(callback) {
_MutationObserver_callback.set(this, void 0);
_MutationObserver_listeners.set(this, []);
_MutationObserver_window.set(this, null);
__classPrivateFieldSet(this, _MutationObserver_callback, callback, "f");
}
/**
* Starts observing.
*
* @param target Target.
* @param options Options.
*/
observe(target, options) {
if (!target) {
throw new TypeError(`Failed to execute 'observe' on 'MutationObserver': The first parameter "target" should be of type "Node".`);
}
if (options && (options.attributeFilter || options.attributeOldValue)) {
if (options.attributes === undefined) {
options = Object.assign({}, options, {
attributes: true,
attributeFilter: options.attributeFilter,
attributeOldValue: options.attributeOldValue
});
}
if (!options.attributes && options.attributeOldValue) {
throw new TypeError(`Failed to execute 'observe' on 'MutationObserver': The options object may only set 'attributeOldValue' to true when 'attributes' is true or not present.`);
}
if (!options.attributes && options.attributeFilter) {
throw new TypeError(`Failed to execute 'observe' on 'MutationObserver': The options object may only set 'attributeFilter' when 'attributes' is true or not present.`);
}
}
if (options && options.characterDataOldValue) {
if (options.characterData === undefined) {
options = Object.assign({}, options, {
characterData: true,
characterDataOldValue: options.characterDataOldValue
});
}
if (!options.characterData && options.characterDataOldValue) {
throw new TypeError(`Failed to execute 'observe' on 'MutationObserver': The options object may only set 'characterDataOldValue' to true when 'characterData' is true or not present.`);
}
}
if (!options || (!options.childList && !options.attributes && !options.characterData)) {
throw new TypeError(`Failed to execute 'observe' on 'MutationObserver': The options object must set at least one of 'attributes', 'characterData', or 'childList' to true.`);
}
if (!__classPrivateFieldGet(this, _MutationObserver_window, "f")) {
__classPrivateFieldSet(this, _MutationObserver_window, target[PropertySymbol.ownerDocument]
? target[PropertySymbol.ownerDocument][PropertySymbol.ownerWindow]
: target[PropertySymbol.ownerWindow], "f");
}
// Makes sure that attribute names are lower case.
// TODO: Is this correct?
options = Object.assign({}, options, {
attributeFilter: options.attributeFilter
? options.attributeFilter.map((name) => name.toLowerCase())
: null
});
/**
* @see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver/observe#reusing_mutationobservers
*/
for (const listener of __classPrivateFieldGet(this, _MutationObserver_listeners, "f")) {
if (listener.target === target) {
listener.options = options;
return;
}
}
const listener = new MutationListener({
window: __classPrivateFieldGet(this, _MutationObserver_window, "f"),
options,
callback: __classPrivateFieldGet(this, _MutationObserver_callback, "f").bind(this),
observer: this,
target
});
__classPrivateFieldGet(this, _MutationObserver_listeners, "f").push(listener);
// Stores all observers on the window object, so that they can be disconnected when the window is closed.
__classPrivateFieldGet(this, _MutationObserver_window, "f")[PropertySymbol.mutationObservers].push(this);
// Starts observing target node.
target[PropertySymbol.observe](listener);
}
/**
* Disconnects.
*/
disconnect() {
if (__classPrivateFieldGet(this, _MutationObserver_listeners, "f").length === 0) {
return;
}
const mutationObservers = __classPrivateFieldGet(this, _MutationObserver_window, "f")[PropertySymbol.mutationObservers];
const index = mutationObservers.indexOf(this);
if (index !== -1) {
mutationObservers.splice(index, 1);
}
for (const listener of __classPrivateFieldGet(this, _MutationObserver_listeners, "f")) {
listener.target[PropertySymbol.unobserve](listener);
listener.destroy();
}
__classPrivateFieldSet(this, _MutationObserver_listeners, [], "f");
}
/**
* Returns a list of all matching DOM changes that have been detected but not yet processed by the observer's callback function, leaving the mutation queue empty.
*
* @returns Records.
*/
takeRecords() {
let records = [];
for (const listener of __classPrivateFieldGet(this, _MutationObserver_listeners, "f")) {
records = records.concat(listener.takeRecords());
}
return records;
}
}
_MutationObserver_callback = new WeakMap(), _MutationObserver_listeners = new WeakMap(), _MutationObserver_window = new WeakMap();
export default MutationObserver;
//# sourceMappingURL=MutationObserver.js.map