bookmarklets/bookmarklet.js at master · oscarotero/bookmarklets · GitHub

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/*
 * ANS jQuery Bookmarklet launcher (v.3.0)
 *
 * A navalla suíza (http://idc.anavallasuiza.com/project/bookmarklet/)
 *
 * Released under the Creative Commons Attribution 3.0 Unported License,
 * as defined here: http://creativecommons.org/licenses/by/3.0/
 */

"use strict";

window.bookmarklet = {
	css: {},
	js: {},
	jQuery: false,

	launch: function (file) {
		if (!file) {
			return false;
		}

		this.loadJS(file, function () {
			var options = window.bookmarklet.options || {};

			window.bookmarklet.execute(options);
		});
	},
	execute: function (options) {
		if (typeof(options.css) !== 'object') {
			if (options.css) {
				options.css = [options.css];
			} else {
				options.css = [];
			}
		}

		if (typeof(options.js) !== 'object') {
			if (options.js) {
				options.js = [options.js];
			} else {
				options.js = [];
			}
		}

		//Load css
		if (options.css.length) {
			var i;

			for (i in options.css) {
				window.bookmarklet.loadCSS(options.css[i]);
			}
		}

		//Load jQuery
		if (options.jquery) {
			options.js.unshift(options.jquery);
		}

		//Load js
		window.bookmarklet.loadMultipleJS(options.js, function () {
			if (options.jquery) {
				if (!window.bookmarklet.jQuery) {
					window.bookmarklet.jQuery = window.jQuery.noConflict(true);
				}

				window.bookmarklet.jQuery(options.ready);
			} else {
				options.ready();
			}
		});
	},
	loadMultipleJS: function (files, onload) {
		if (files.length === 0) {
			if (onload) {
				onload();
			}

			return true;
		}

		this.loadJS(files.shift(), function () {
			window.bookmarklet.loadMultipleJS(files, onload);
		});
	},
	loadJS: function (file, onload) {
		var element = this.loadedJS(file);

		if (element) {
			if (typeof onload === 'function') {
				onload.call(element);
			}

			return false;
		}

		element = document.createElement('script');
		element.type = 'text/javascript';
		element.src = file;

		if (!document.attachEvent) {
			element.onload = onload;
		} else if (typeof onload === 'function') {
			element.onreadystatechange = function () {
				if (element.readyState === 'complete' || element.readyState === 'loaded') {
					onload.call(element);
					element.onreadystatechange = null;
				}
			};
		}

		document.body.appendChild(element);

		this.js[file] = element;

		return element;
	},
	loadCSS: function (file) {
		if (this.loadedCSS(file)) {
			return false;
		}

		var element = document.createElement('link');
		element.setAttribute('rel', 'stylesheet');
		element.setAttribute('type', 'text/css');
		element.setAttribute('href', file);

		document.getElementsByTagName('head')[0].appendChild(element);

		this.css[file] = element;

		return element;
	},
	loadedJS: function (file) {
		if (this.js[file]) {
			return this.js[file];
		}

		return false;
	},
	loadedCSS: function (file) {
		if (this.css[file]) {
			return this.css[file];
		}

		return false;
	},
	die: function () {
		var i;

		for (i in this.js) {
			this.js[i].parentNode.removeChild(this.js[i]);
		}
		for (i in this.css) {
			this.css[i].parentNode.removeChild(this.css[i]);
		}

		this.js = {};
		this.css = {};
		this.jQuery = false;
	}
};