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