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data-ice="title">es6/observable/FromEventPatternObservable.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Observable } from '../Observable'; import { Subscription } from '../Subscription'; /** * We need this JSDoc comment for affecting ESDoc. * @extends {Ignored} * @hide true */ export var FromEventPatternObservable = (function (_super) { __extends(FromEventPatternObservable, _super); function FromEventPatternObservable(addHandler, removeHandler, selector) { _super.call(this); this.addHandler = addHandler; this.removeHandler = removeHandler; this.selector = selector; } /** * Creates an Observable from an API based on addHandler/removeHandler * functions. * * <span class="informal">Converts any addHandler/removeHandler API to an * Observable.</span> * * <img src="./img/fromEventPattern.png" width="100%"> * * Creates an Observable by using the `addHandler` and `removeHandler` * functions to add and remove the handlers, with an optional selector * function to project the event arguments to a result. The `addHandler` is * called when the output Observable is subscribed, and `removeHandler` is * called when the Subscription is unsubscribed. * * @example <caption>Emits clicks happening on the DOM document</caption> * function addClickHandler(handler) { * document.addEventListener('click', handler); * } * * function removeClickHandler(handler) { * document.removeEventListener('click', handler); * } * * var clicks = Rx.Observable.fromEventPattern( * addClickHandler, * removeClickHandler * ); * clicks.subscribe(x => console.log(x)); * * @see {@link from} * @see {@link fromEvent} * * @param {function(handler: Function): any} addHandler A function that takes * a `handler` function as argument and attaches it somehow to the actual * source of events. * @param {function(handler: Function): void} removeHandler A function that * takes a `handler` function as argument and removes it in case it was * previously attached using `addHandler`. * @param {function(...args: any): T} [selector] An optional function to * post-process results. It takes the arguments from the event handler and * should return a single value. * @return {Observable<T>} * @static true * @name fromEventPattern * @owner Observable */ FromEventPatternObservable.create = function (addHandler, removeHandler, selector) { return new FromEventPatternObservable(addHandler, removeHandler, selector); }; FromEventPatternObservable.prototype._subscribe = function (subscriber) { var _this = this; var removeHandler = this.removeHandler; var handler = !!this.selector ? function () { var args = []; for (var _i = 0; _i < arguments.length; _i++) { args[_i - 0] = arguments[_i]; } _this._callSelector(subscriber, args); } : function (e) { subscriber.next(e); }; this._callAddHandler(handler, subscriber); subscriber.add(new Subscription(function () { //TODO: determine whether or not to forward to error handler removeHandler(handler); })); }; FromEventPatternObservable.prototype._callSelector = function (subscriber, args) { try { var result = this.selector.apply(this, args); subscriber.next(result); } catch (e) { subscriber.error(e); } }; FromEventPatternObservable.prototype._callAddHandler = function (handler, errorSubscriber) { try { this.addHandler(handler); } catch (e) { errorSubscriber.error(e); } }; return FromEventPatternObservable; }(Observable)); //# sourceMappingURL=FromEventPatternObservable.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>