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| 1 | |
| 2 (function() { | |
| 3 "use strict"; | |
| 4 /** | |
| 5 `Polymer.IronJsonpLibraryBehavior` loads a jsonp library. | |
| 6 Multiple components can request same library, only one copy will load. | |
| 7 | |
| 8 Some libraries require a specific global function be defined. | |
| 9 If this is the case, specify the `callbackName` property. | |
| 10 | |
| 11 You should use an HTML Import to load library dependencies | |
| 12 when possible instead of using this element. | |
| 13 | |
| 14 @hero hero.svg | |
| 15 @demo demo/index.html | |
| 16 @polymerBehavior | |
| 17 */ | |
| 18 Polymer.IronJsonpLibraryBehavior = { | |
| 19 | |
| 20 properties: { | |
| 21 /** | |
| 22 * True if library has been successfully loaded | |
| 23 */ | |
| 24 libraryLoaded: { | |
| 25 type: Boolean, | |
| 26 value: false, | |
| 27 notify: true, | |
| 28 readOnly: true | |
| 29 }, | |
| 30 /** | |
| 31 * Not null if library has failed to load | |
| 32 */ | |
| 33 libraryErrorMessage: { | |
| 34 type: String, | |
| 35 value: null, | |
| 36 notify: true, | |
| 37 readOnly: true | |
| 38 } | |
| 39 // Following properties are to be set by behavior users | |
| 40 /** | |
| 41 * Library url. Must contain string `%%callback_name%%`. | |
| 42 * | |
| 43 * `%%callback_name%%` is a placeholder for jsonp wrapper function name | |
| 44 * | |
| 45 * Ex: https://maps.googleapis.com/maps/api/js?callback=%%callback%% | |
| 46 * @property libraryUrl | |
| 47 */ | |
| 48 /** | |
| 49 * Set if library requires specific callback name. | |
| 50 * Name will be automatically generated if not set. | |
| 51 * @property callbackName | |
| 52 */ | |
| 53 /** | |
| 54 * name of event to be emitted when library loads. Standard is `api-load` | |
| 55 * @property notifyEvent | |
| 56 */ | |
| 57 /** | |
| 58 * event with name specified in `notifyEvent` attribute | |
| 59 * will fire upon successful load2 | |
| 60 * @event `notifyEvent` | |
| 61 */ | |
| 62 }, | |
| 63 | |
| 64 _libraryLoadCallback: function(err, result) { | |
| 65 if (err) { | |
| 66 console.warn("Library load failed:", err.message); | |
| 67 this._setLibraryErrorMessage(err.message); | |
| 68 } | |
| 69 else { | |
| 70 this._setLibraryErrorMessage(null); | |
| 71 this._setLibraryLoaded(true); | |
| 72 if (this.notifyEvent) | |
| 73 this.fire( this.notifyEvent, result); | |
| 74 } | |
| 75 }, | |
| 76 | |
| 77 /** loads the library, and fires this.notifyEvent upon completion */ | |
| 78 _loadLibrary: function() { | |
| 79 LoaderMap.require( | |
| 80 this.libraryUrl, | |
| 81 this._libraryLoadCallback.bind(this), | |
| 82 this.callbackName | |
| 83 ); | |
| 84 }, | |
| 85 | |
| 86 ready: function() { | |
| 87 this._loadLibrary(); | |
| 88 } | |
| 89 }; | |
| 90 | |
| 91 /** | |
| 92 * LoaderMap keeps track of all Loaders | |
| 93 */ | |
| 94 var LoaderMap = { | |
| 95 apiMap: {}, // { hash -> Loader } | |
| 96 | |
| 97 /** | |
| 98 * @param {Function} notifyCallback loaded callback fn(result) | |
| 99 * @param {string} jsonpCallbackName name of jsonpcallback. If API does not
provide it, leave empty. Optional. | |
| 100 */ | |
| 101 require: function(url, notifyCallback, jsonpCallbackName) { | |
| 102 | |
| 103 // make hashable string form url | |
| 104 var name = this.nameFromUrl(url); | |
| 105 | |
| 106 // create a loader as needed | |
| 107 if (!this.apiMap[name]) | |
| 108 this.apiMap[name] = new Loader(name, url, jsonpCallbackName); | |
| 109 | |
| 110 // ask for notification | |
| 111 this.apiMap[name].requestNotify(notifyCallback); | |
| 112 }, | |
| 113 | |
| 114 nameFromUrl: function(url) { | |
| 115 return url.replace(/[\:\/\%\?\&\.\=\-\,]/g, '_') + '_api'; | |
| 116 } | |
| 117 }; | |
| 118 | |
| 119 /** @constructor */ | |
| 120 var Loader = function(name, url, callbackName) { | |
| 121 this.notifiers = []; // array of notifyFn [ notifyFn* ] | |
| 122 | |
| 123 // callback is specified either as callback name | |
| 124 // or computed dynamically if url has callbackMacro in it | |
| 125 if (!callbackName) { | |
| 126 if (url.indexOf(this.callbackMacro) >= 0) { | |
| 127 callbackName = name + '_loaded'; | |
| 128 url = url.replace(this.callbackMacro, callbackName); | |
| 129 } else { | |
| 130 this.error = new Error('IronJsonpLibraryBehavior a %%callback_name%% par
ameter is required in libraryUrl'); | |
| 131 // TODO(sjmiles): we should probably fallback to listening to script.loa
d | |
| 132 return; | |
| 133 } | |
| 134 } | |
| 135 this.callbackName = callbackName; | |
| 136 window[this.callbackName] = this.success.bind(this); | |
| 137 this.addScript(url); | |
| 138 }; | |
| 139 | |
| 140 Loader.prototype = { | |
| 141 | |
| 142 callbackMacro: '%%callback%%', | |
| 143 loaded: false, | |
| 144 | |
| 145 addScript: function(src) { | |
| 146 var script = document.createElement('script'); | |
| 147 script.src = src; | |
| 148 script.onerror = this.handleError.bind(this); | |
| 149 var s = document.querySelector('script') || document.body; | |
| 150 s.parentNode.insertBefore(script, s); | |
| 151 this.script = script; | |
| 152 }, | |
| 153 | |
| 154 removeScript: function() { | |
| 155 if (this.script.parentNode) { | |
| 156 this.script.parentNode.removeChild(this.script); | |
| 157 } | |
| 158 this.script = null; | |
| 159 }, | |
| 160 | |
| 161 handleError: function(ev) { | |
| 162 this.error = new Error("Library failed to load"); | |
| 163 this.notifyAll(); | |
| 164 this.cleanup(); | |
| 165 }, | |
| 166 | |
| 167 success: function() { | |
| 168 this.loaded = true; | |
| 169 this.result = Array.prototype.slice.call(arguments); | |
| 170 this.notifyAll(); | |
| 171 this.cleanup(); | |
| 172 }, | |
| 173 | |
| 174 cleanup: function() { | |
| 175 delete window[this.callbackName]; | |
| 176 }, | |
| 177 | |
| 178 notifyAll: function() { | |
| 179 this.notifiers.forEach( function(notifyCallback) { | |
| 180 notifyCallback(this.error, this.result); | |
| 181 }.bind(this)); | |
| 182 this.notifiers = []; | |
| 183 }, | |
| 184 | |
| 185 requestNotify: function(notifyCallback) { | |
| 186 if (this.loaded || this.error) { | |
| 187 notifyCallback( this.error, this.result); | |
| 188 } else { | |
| 189 this.notifiers.push(notifyCallback); | |
| 190 } | |
| 191 } | |
| 192 }; | |
| 193 })(); | |
| 194 | |
| 195 ; | |
| 196 Polymer({ | |
| 197 | |
| 198 is: 'iron-jsonp-library', | |
| 199 | |
| 200 behaviors: [ Polymer.IronJsonpLibraryBehavior ], | |
| 201 | |
| 202 properties: { | |
| 203 /** | |
| 204 * Library url. Must contain string `%%callback_name%%`. | |
| 205 * | |
| 206 * `%%callback_name%%` is a placeholder for jsonp wrapper function name | |
| 207 * | |
| 208 * Ex: https://maps.googleapis.com/maps/api/js?callback=%%callback%% | |
| 209 */ | |
| 210 libraryUrl: String, | |
| 211 /** | |
| 212 * Set if library requires specific callback name. | |
| 213 * Name will be automatically generated if not set. | |
| 214 */ | |
| 215 callbackName: String, | |
| 216 /** | |
| 217 * event with name specified in 'notifyEvent' attribute | |
| 218 * will fire upon successful load | |
| 219 */ | |
| 220 notifyEvent: String | |
| 221 /** | |
| 222 * event with name specified in 'notifyEvent' attribute | |
| 223 * will fire upon successful load | |
| 224 * @event `notifyEvent` | |
| 225 */ | |
| 226 | |
| 227 } | |
| 228 }); | |
| 229 | |
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