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51841
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sofia.balt
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// /**
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// * @license
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// * Copyright Google Inc. All Rights Reserved.
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// *
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// * Use of this source code is governed by an MIT-style license that can be
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// * found in the LICENSE file at https://angular.io/license
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// */
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//
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// import {Injectable, Inject} from '@angular/core';
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// // es6-modules are used here
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// import { ɵgetDOM as getDOM} from '@angular/platform-browser';
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// import {DOCUMENT} from '@angular/platform-browser';
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// /**
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// * Represent meta element.
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// *
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// * ### Example
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// *
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// * ```ts
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// * { name: 'application-name', content: 'Name of my application' },
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// * { name: 'description', content: 'A description of the page', id: 'desc' }
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// * // ...
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// * // Twitter
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// * { name: 'twitter:title', content: 'Content Title' }
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// * // ...
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// * // Google+
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// * { itemprop: 'name', content: 'Content Title' },
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// * { itemprop: 'description', content: 'Content Title' }
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// * // ...
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// * // Facebook / Open Graph
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// * { property: 'fb:app_id', content: '123456789' },
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// * { property: 'og:title', content: 'Content Title' }
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// * ```
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// *
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// * @experimental
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// */
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// export interface MetaDefinition {
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// charset?: string;
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// content?: string;
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// httpEquiv?: string;
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// id?: string;
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// itemprop?: string;
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// name?: string;
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// property?: string;
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// scheme?: string;
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// url?: string;
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// [prop: string]: string;
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// }
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//
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// /**
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// * A service that can be used to get and add meta tags.
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// *
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// * @experimental
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// */
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// @Injectable()
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// export class Meta {
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// private _dom: any = getDOM();
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// constructor( @Inject(DOCUMENT) private _document: any) { }
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// /**
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// * Sets the title of the page
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// */
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// setTitle(title: string) {
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// this._document.title = title
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// }
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// /**
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// * Adds a new meta tag to the dom.
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// *
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// * ### Example
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// *
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// * ```ts
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// * const name: MetaDefinition = {name: 'application-name', content: 'Name of my application'};
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// * const desc: MetaDefinition = {name: 'description', content: 'A description of the page'};
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// * const tags: HTMLMetaElement[] = this.meta.addTags([name, desc]);
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// * ```
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// *
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// * @param tags
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// * @returns {HTMLMetaElement[]}
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// */
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// addTags(...tags: Array<MetaDefinition|MetaDefinition[]>): HTMLMetaElement[] {
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// const presentTags = this._flattenArray(tags);
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// if (presentTags.length === 0) return [];
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// return presentTags.map((tag: MetaDefinition) => this._addInternal(tag));
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// }
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//
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// /**
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// * Gets the meta tag by the given selector. Returns element or null
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// * if there's no such meta element.
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// *
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// * ### Example
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// *
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// * ```ts
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// * const meta: HTMLMetaElement = this.meta.getTag('name=description');
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// * const twitterMeta: HTMLMetaElement = this.meta.getTag('name="twitter:title"');
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// * const fbMeta: HTMLMetaElement = this.meta.getTag('property="fb:app_id"');
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// * ```
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// *
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// * @param selector
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// * @returns {HTMLMetaElement}
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// */
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// // getTag(selector: string): HTMLMetaElement {
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// // if (!selector) return null;
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// // return this._dom.query(`meta[${selector}]`);
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// // }
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// getTag(attrSelector: string): HTMLMetaElement|null {
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// if (!attrSelector) return null;
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// return this._dom.querySelector(this._document, `meta[${attrSelector}]`);
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// }
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//
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// /**
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// * Updates the meta tag with the given selector.
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// *
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// * * ### Example
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// *
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// * ```ts
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// * const meta: HTMLMetaElement = this.meta.updateTag('name=description', {name: 'description',
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// * content: 'New description'});
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// * console.log(meta.content); // 'New description'
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// * ```
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// *
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// * @param selector
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// * @param tag updated tag definition
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// * @returns {HTMLMetaElement}
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// */
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// updateTag(selector: string, tag: MetaDefinition): HTMLMetaElement {
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// const meta: HTMLMetaElement = this.getTag(selector);
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// if (!meta) {
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// // create element if it doesn't exist
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// return this._addInternal(tag);
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// }
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// return this._prepareMetaElement(tag, meta);
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// }
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//
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// updateMeta(name, content) {
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// const head = this._document.head;
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// let childNodesAsList = this._dom.childNodesAsList(head);
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// let metaEl = childNodesAsList.find(el => el['attribs'] ? el['attribs'].name == name : false);
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// if (metaEl) metaEl['attribs'].content = content;
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// }
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// updateProperty(property, content) {
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// const head = this._document.head;
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// let childNodesAsList = this._dom.childNodesAsList(head);
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// let metaEl = childNodesAsList.find(el => el['attribs'] ? el['attribs'].property == property : false);
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// if (metaEl) metaEl['attribs'].content = content;
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// }
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//
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// /**
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// * Removes meta tag with the given selector from the dom.
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// *
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// * ### Example
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// *
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// * ```ts
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// * this.meta.removeTagBySelector('name=description');
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// * ```
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// *
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// * @param selector
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// */
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// removeTagBySelector(selector: string): void {
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// const meta: HTMLMetaElement = this.getTag(selector);
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// this.removeTagElement(meta);
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// }
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//
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// /**
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// * Removes given meta element from the dom.
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// *
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// * ### Example
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// * ```ts
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// * const elem: HTMLMetaElement = this.meta.getTag('name=description');
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// * this.meta.removeTagElement(elem);
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// * ```
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// *
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// * @param meta meta element
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// */
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// removeTagElement(meta: HTMLMetaElement): void {
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// if (meta) {
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// this._removeMetaElement(meta);
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// }
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// }
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//
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// private _addInternal(tag: MetaDefinition): HTMLMetaElement {
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// const meta: HTMLMetaElement = this._createMetaElement();
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// this._prepareMetaElement(tag, meta);
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// this._appendMetaElement(meta);
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// return meta;
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// }
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//
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// private _createMetaElement(): HTMLMetaElement {
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// return this._dom.createElement('meta') as HTMLMetaElement;
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// }
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//
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// private _prepareMetaElement(tag: MetaDefinition, el: HTMLMetaElement): HTMLMetaElement {
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// Object.keys(tag).forEach((prop: string) => this._dom.setAttribute(el, prop, tag[prop]));
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// return el;
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// }
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//
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// // private _appendMetaElement(meta: HTMLMetaElement): void {
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// // const head = this._dom.getElementsByTagName(this._dom.defaultDoc(), 'head')[0];
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// // this._dom.appendChild(head, meta);
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// // }
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// private _appendMetaElement(meta: HTMLMetaElement): void {
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// const head = this._document.head;
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// this._dom.appendChild(head, meta);
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// }
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// private _removeMetaElement(meta: HTMLMetaElement): void {
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// const head = this._dom.parentElement(meta);
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// this._dom.removeChild(head, meta);
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// }
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//
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// private _flattenArray(input: any[], out: any[] = []): any[] {
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// if (input) {
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// for (let i = 0; i < input.length; i++) {
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// const item: any = input[i];
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// if (Array.isArray(item)) {
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// this._flattenArray(item, out);
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// } else if (item) {
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// out.push(item);
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// }
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// }
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// }
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// return out;
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// }
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// }
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