happy-dom
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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.
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JavaScript
import CSSStyleSheet from '../../css/CSSStyleSheet.js';
import * as PropertySymbol from '../../PropertySymbol.js';
import HTMLElement from '../html-element/HTMLElement.js';
import Event from '../../event/Event.js';
import DOMTokenList from '../element/DOMTokenList.js';
import WindowErrorUtility from '../../window/WindowErrorUtility.js';
import DOMExceptionNameEnum from '../../exception/DOMExceptionNameEnum.js';
import ResourceFetch from '../../fetch/ResourceFetch.js';
import WindowBrowserContext from '../../window/WindowBrowserContext.js';
/**
* HTML Link Element.
*
* Reference:
* https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement.
*/
export default class HTMLLinkElement extends HTMLElement {
// Events
onerror = null;
onload = null;
// Internal properties
[PropertySymbol.sheet] = null;
[PropertySymbol.evaluateCSS] = true;
[PropertySymbol.relList] = null;
#loadedStyleSheetURL = null;
/**
* Returns sheet.
*/
get sheet() {
return this[PropertySymbol.sheet];
}
/**
* Returns rel list.
*
* @returns Rel list.
*/
get relList() {
if (!this[PropertySymbol.relList]) {
this[PropertySymbol.relList] = new DOMTokenList(this, 'rel');
}
return this[PropertySymbol.relList];
}
/**
* Returns as.
*
* @returns As.
*/
get as() {
return this.getAttribute('as') || '';
}
/**
* Sets crossOrigin.
*
* @param crossOrigin CrossOrigin.
*/
set as(as) {
this.setAttribute('as', as);
}
/**
* Returns crossOrigin.
*
* @returns CrossOrigin.
*/
get crossOrigin() {
return this.getAttribute('crossorigin') || '';
}
/**
* Sets crossOrigin.
*
* @param crossOrigin CrossOrigin.
*/
set crossOrigin(crossOrigin) {
this.setAttribute('crossorigin', crossOrigin);
}
/**
* Returns href.
*
* @returns Href.
*/
get href() {
if (!this.hasAttribute('href')) {
return '';
}
try {
return new URL(this.getAttribute('href'), this[PropertySymbol.ownerDocument].location.href)
.href;
}
catch (e) {
return this.getAttribute('href');
}
}
/**
* Sets href.
*
* @param href Href.
*/
set href(href) {
this.setAttribute('href', href);
}
/**
* Returns hreflang.
*
* @returns Hreflang.
*/
get hreflang() {
return this.getAttribute('hreflang') || '';
}
/**
* Sets hreflang.
*
* @param hreflang Hreflang.
*/
set hreflang(hreflang) {
this.setAttribute('hreflang', hreflang);
}
/**
* Returns media.
*
* @returns Media.
*/
get media() {
return this.getAttribute('media') || '';
}
/**
* Sets media.
*
* @param media Media.
*/
set media(media) {
this.setAttribute('media', media);
}
/**
* Returns referrerPolicy.
*
* @returns ReferrerPolicy.
*/
get referrerPolicy() {
return this.getAttribute('referrerPolicy') || '';
}
/**
* Sets referrerPolicy.
*
* @param referrerPolicy ReferrerPolicy.
*/
set referrerPolicy(referrerPolicy) {
this.setAttribute('referrerPolicy', referrerPolicy);
}
/**
* Returns rel.
*
* @returns Rel.
*/
get rel() {
return this.getAttribute('rel') || '';
}
/**
* Sets rel.
*
* @param rel Rel.
*/
set rel(rel) {
this.setAttribute('rel', rel);
}
/**
* Returns type.
*
* @returns Type.
*/
get type() {
return this.getAttribute('type') || '';
}
/**
* Sets type.
*
* @param type Type.
*/
set type(type) {
this.setAttribute('type', type);
}
/**
* @override
*/
[PropertySymbol.connectedToDocument]() {
super[PropertySymbol.connectedToDocument]();
if (this[PropertySymbol.evaluateCSS]) {
this.#loadStyleSheet(this.getAttribute('href'), this.getAttribute('rel'));
}
}
/**
* @override
*/
[PropertySymbol.onSetAttribute](attribute, replacedAttribute) {
super[PropertySymbol.onSetAttribute](attribute, replacedAttribute);
if (attribute[PropertySymbol.name] === 'rel') {
this.#loadStyleSheet(this.getAttribute('href'), attribute[PropertySymbol.value]);
}
else if (attribute[PropertySymbol.name] === 'href') {
this.#loadStyleSheet(attribute[PropertySymbol.value], this.getAttribute('rel'));
}
}
/**
* Returns a URL relative to the given Location object.
*
* @param url URL.
* @param rel Rel.
*/
async #loadStyleSheet(url, rel) {
const window = this[PropertySymbol.window];
const browserFrame = new WindowBrowserContext(window).getBrowserFrame();
if (!browserFrame) {
return;
}
const browserSettings = browserFrame.page?.context?.browser?.settings;
if (!url || !rel || rel.toLowerCase() !== 'stylesheet' || !this[PropertySymbol.isConnected]) {
return;
}
let absoluteURL;
try {
absoluteURL = new URL(url, window.location.href).href;
}
catch (error) {
return;
}
if (this.#loadedStyleSheetURL === absoluteURL) {
return;
}
if (browserSettings && browserSettings.disableCSSFileLoading) {
if (browserSettings.handleDisabledFileLoadingAsSuccess) {
this.dispatchEvent(new Event('load'));
}
else {
WindowErrorUtility.dispatchError(this, new window.DOMException(`Failed to load external stylesheet "${absoluteURL}". CSS file loading is disabled.`, DOMExceptionNameEnum.notSupportedError));
}
return;
}
const resourceFetch = new ResourceFetch({
browserFrame,
window: window
});
const readyStateManager = window[PropertySymbol.readyStateManager];
this.#loadedStyleSheetURL = absoluteURL;
readyStateManager.startTask();
let code = null;
let error = null;
try {
code = await resourceFetch.fetch(absoluteURL);
}
catch (e) {
error = e;
}
readyStateManager.endTask();
if (error) {
WindowErrorUtility.dispatchError(this, error);
}
else {
const styleSheet = new CSSStyleSheet();
styleSheet.replaceSync(code);
this[PropertySymbol.sheet] = styleSheet;
// Computed style cache is affected by all mutations.
const document = this[PropertySymbol.ownerDocument];
if (document) {
for (const item of document[PropertySymbol.affectsComputedStyleCache]) {
item.result = null;
}
document[PropertySymbol.affectsComputedStyleCache] = [];
}
this.dispatchEvent(new Event('load'));
}
}
}
//# sourceMappingURL=HTMLLinkElement.js.map