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libCtxtMenu

Simple adapter for adding legacy browsers rightclick menu commands.

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/435215/986494/libCtxtMenu.js 

// ==UserScript==
// ==UserLibrary==
// @name         libCtxtMenu
// @namespace    https://openuserjs.org/users/Anakunda
// @version      1.00.0
// @author       Anakunda
// @license      GPL-3.0-or-later
// @copyright    2021, Anakunda (https://openuserjs.org/users/Anakunda)
// ==/UserScript==
// ==/UserLibrary==

'use strict';

class ContextMenu {
	constructor(id, create = true) {
		if (!id) {
			let dt = new Date().getTime();
			this.id = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
				const r = (dt + Math.random() * 16) % 16 | 0;
				dt = Math.floor(dt / 16);
				return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
			});
		}
		if (!(this.new = (this.menu = document.body.querySelector(`menu[type="context"][id="${id}"]`)) == null)) return;
		this.menu = document.createElement('MENU');
		this.menu.type = 'context';
		this.menu.id = id;
		if (create) this.create();
	}

	create() {
		if (this.menu.parentNode == null) document.body.append(this.menu);
	}
	destroy() {
		if (this.menu.parentNode != null) this.menu.parentNode.removeChild(this.menu);
	}
	addItem(caption, callback) {
		if (!this.new) return false;
		console.assert(this.menu instanceof HTMLMenuElement);
		const menuItem = document.createElement('MENUITEM');
		if (caption) menuItem.label = caption; else return;
		if (typeof callback == 'function') {
			menuItem.type = 'command';
			menuItem.onclick = evt => {
				console.assert(this.target instanceof HTMLElement);
				return this.target instanceof HTMLElement ? callback(this.target) : false; //callback.call(this.target, this.target)
			};
		}
		this.menu.append(menuItem);
		return true;
	}

	attach(element) {
		if (!(element instanceof HTMLElement)) throw 'Invalid argument';
		console.assert(this.menu instanceof HTMLMenuElement);
		this.create();
		element.setAttribute('contextmenu', this.menu.id);
		element.oncontextmenu = evt => { this.target = evt.currentTarget };
	}
	detach(element) {
		if (!(element instanceof HTMLElement)) throw 'Invalid argument';
		console.assert(this.menu instanceof HTMLMenuElement);
		if (element.getAttribute('contextmenu') != this.menu.id) return;
		element.oncontextmenu = null;
		element.removeAttribute('contextmenu');
	}
}