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annotate geotemco/js/Build/Loader/DynaJsLoader.js @ 0:b12c99b7c3f0

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commit for previous development
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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1 /*
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2 * DynaJsLoader.js
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3 *
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4 * Copyright (c) 2012, Stefan Jänicke. All rights reserved.
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5 *
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6 * This library is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 3 of the License, or (at your option) any later version.
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10 *
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11 * This library is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with this library; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 * MA 02110-1301 USA
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20 */
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21
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22 /**
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23 * Dynamic Script Loader for GeoTemCo
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24 * @author Stefan Jänicke (stjaenicke@informatik.uni-leipzig.de)
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25 * @release 1.0
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26 * @release date: 2012-07-27
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27 * @version date: 2012-07-27
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28 */
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29 function DynaJsLoader() {
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30
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31 this.checkInterval = 20;
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32 this.loadAttempts = 2000;
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33
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34 this.loadScripts = function(scripts, callback) {
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35
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36 if (scripts.length > 0) {
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37 this.scriptStack = scripts;
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38 this.scriptIndex = 0;
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39 this.loadScript(callback);
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40 }
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41
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42 };
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43
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44 this.loadScript = function(callback) {
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45
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46 var loader = this;
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47 if (this.scriptIndex < this.scriptStack.length) {
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48
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49 var scriptEmbedded = false, scriptLoaded = false, iter = 0;
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50 var scriptData = this.scriptStack[this.scriptIndex];
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51 this.scriptIndex++;
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52 var testFunction = scriptData.test;
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53 var test = function() {
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54 scriptEmbedded = true;
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55 if (!testFunction || typeof (eval(testFunction)) === 'function') {
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56 scriptLoaded = true;
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57 } else {
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58 setTimeout(function() {
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59 test();
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60 }), loader.checkInterval
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61 }
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62 }
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63 var head = document.getElementsByTagName('head')[0];
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64 var script = document.createElement('script');
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65 script.type = 'text/javascript';
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66 script.src = scriptData.url;
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67
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68 script.onload = test;
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69 script.onreadystatechange = function() {
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70 if (this.readyState == 'complete') {
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71 test();
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72 }
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73 }
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74
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75 head.appendChild(script);
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76
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77 var checkStatus = function() {
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78 if (scriptEmbedded && scriptLoaded) {
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79 loader.loadScript(callback);
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80 if ( typeof console != 'undefined') {
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81 console.log(scriptData.url + " loaded in " + (iter * loader.checkInterval) + " ms");
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82 }
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83 } else {
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84 iter++;
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85 if (iter > loader.loadAttempts) {
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86 if ( typeof console != 'undefined') {
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87 console.log("MapTimeView not loaded: Not able to load " + scriptData.url + "!");
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88 Publisher.Publish('StifReady', null);
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89 }
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90 return;
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91 }
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92 setTimeout(function() {
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93 checkStatus();
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94 }), loader.checkInterval
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95 }
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96 }
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97 checkStatus();
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98
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99 } else if (callback) {
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100 callback();
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101 }
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102
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103 };
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104
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105 };