http://www.meshlabjs.net/js/mlj/gui/Log.js

1/**
2 * MLJLib
3 * MeshLabJS Library
4 * 
5 * Copyright(C) 2015
6 * Paolo Cignoni 
7 * Visual Computing Lab
8 * ISTI - CNR
9 * 
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify it under 
13 * the terms of the GNU General Public License as published by the Free Software 
14 * Foundation; either version 2 of the License, or (at your option) any later 
15 * version.
16 *
17 * This program is distributed in the hope that it will be useful, but WITHOUT 
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
19 * FOR A PARTICULAR PURPOSE. See theGNU General Public License 
20 * (http://www.gnu.org/licenses/gpl.txt) for more details.
21 * 
22 */
23
24/**
25 * @file Defines and installs the Log widget the text area used like standard output 
26 * @author Stefano Gabriele
27 */
28(function (component) {
29    
30    /**         
31     * @class Create a new Log widget
32     * @augments  MLJ.gui.Widget
33     * @private
34     * @memberOf MLJ.gui.widget
35     * @author Stefano Gabriele 
36     */
37    var _Log = function () {
38
39        var _this = this;
40
41        //Console output redirecting ...
42        var _log = console.log, _warn = console.warn, _error = console.error;
43
44        console.log = function (message, args) {
45            var m = args ? message + " " + args : message;
46            _this.append(m);
47            _log.apply(console, arguments);
48        };
49
50        console.warn = function (message, args) {
51            var m = args ? message + " " + args : message;
52            _this.append(m);
53            _warn.apply(console, arguments);
54        };
55
56        console.error = function (message, args) {
57            var m = args ? message + " " + args : message;
58            _this.append(m);
59            _error.apply(console, arguments);
60        };
61
62        var _$log = $('<textarea/>')
63                .attr("spellcheck", false)
64                .attr("readonly", "readonly");
65        
66        /**
67         * @author Stefano Gabriele
68         */
69        this._make = function () {
70            var $wrap = $('<div/>').attr("id", "mlj-log-widget");
71            $wrap.append(_$log);
72            return $wrap;
73        };
74        
75        /**
76         * Appends text to Log
77         * @param {String} text The text to append
78         * @author Stefano Gabriele
79         */
80        this.append = function (text) {
81            _$log.append(text + "\n");
82            _$log.scrollTop(_$log[0].scrollHeight - _$log.height());
83        };
84    };
85
86    MLJ.extend(MLJ.gui.Widget, _Log);
87
88    //Install widget
89    MLJ.gui.installWidget("Log", new _Log());
90
91})(MLJ.gui.component);