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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <base data-ice="baseUrl" href="../../../"> <title data-ice="title">spec-js/observables/fromEvent-spec.js | RxJS API Document</title> <link type="text/css" rel="stylesheet" href="css/style.css"> <link type="text/css" rel="stylesheet" href="css/prettify-tomorrow.css"> <script src="script/prettify/prettify.js"></script> <script src="script/manual.js"></script> <script data-ice="userScript" src="user/script/0-Rx.js"></script> <script data-ice="userScript" src="user/script/1-devtools-welcome.js"></script> <script data-ice="userScript" src="user/script/2-custom-manual-styles.js"></script> <script data-ice="userScript" src="user/script/3-decision-tree-widget.min.js"></script> <script data-ice="userScript" src="user/script/4-theme-toggler.js"></script> <link data-ice="userStyle" rel="stylesheet" href="user/css/0-main.css"> </head> <body class="layout-container" data-ice="rootContainer"> <header> <a href="./">Home</a> <a 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data-ice="title">spec-js/observables/fromEvent-spec.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">&quot;use strict&quot;; var chai_1 = require(&apos;chai&apos;); var Rx = require(&apos;../../dist/cjs/Rx&apos;); var Observable = Rx.Observable; /** @test {fromEvent} */ describe(&apos;Observable.fromEvent&apos;, function () { asDiagram(&apos;fromEvent(element, \&apos;click\&apos;)&apos;)(&apos;should create an observable of click on the element&apos;, function () { var target = { addEventListener: function (eventType, listener) { Observable.timer(50, 20, rxTestScheduler) .mapTo(&apos;ev&apos;) .take(2) .concat(Observable.never()) .subscribe(listener); }, removeEventListener: function () { return void 0; }, dispatchEvent: function () { return void 0; }, }; var e1 = Observable.fromEvent(target, &apos;click&apos;); var expected = &apos;-----x-x---&apos;; expectObservable(e1).toBe(expected, { x: &apos;ev&apos; }); }); it(&apos;should setup an event observable on objects with &quot;on&quot; and &quot;off&quot; &apos;, function () { var onEventName; var onHandler; var offEventName; var offHandler; var obj = { on: function (a, b) { onEventName = a; onHandler = b; }, off: function (a, b) { offEventName = a; offHandler = b; } }; var subscription = Observable.fromEvent(obj, &apos;click&apos;) .subscribe(function () { //noop }); subscription.unsubscribe(); chai_1.expect(onEventName).to.equal(&apos;click&apos;); chai_1.expect(typeof onHandler).to.equal(&apos;function&apos;); chai_1.expect(offEventName).to.equal(onEventName); chai_1.expect(offHandler).to.equal(onHandler); }); it(&apos;should setup an event observable on objects with &quot;addEventListener&quot; and &quot;removeEventListener&quot; &apos;, function () { var onEventName; var onHandler; var offEventName; var offHandler; var obj = { addEventListener: function (a, b, useCapture) { onEventName = a; onHandler = b; }, removeEventListener: function (a, b, useCapture) { offEventName = a; offHandler = b; } }; var subscription = Observable.fromEvent(obj, &apos;click&apos;) .subscribe(function () { //noop }); subscription.unsubscribe(); chai_1.expect(onEventName).to.equal(&apos;click&apos;); chai_1.expect(typeof onHandler).to.equal(&apos;function&apos;); chai_1.expect(offEventName).to.equal(onEventName); chai_1.expect(offHandler).to.equal(onHandler); }); it(&apos;should setup an event observable on objects with &quot;addListener&quot; and &quot;removeListener&quot; &apos;, function () { var onEventName; var onHandler; var offEventName; var offHandler; var obj = { addListener: function (a, b) { onEventName = a; onHandler = b; }, removeListener: function (a, b) { offEventName = a; offHandler = b; } }; var subscription = Observable.fromEvent(obj, &apos;click&apos;) .subscribe(function () { //noop }); subscription.unsubscribe(); chai_1.expect(onEventName).to.equal(&apos;click&apos;); chai_1.expect(typeof onHandler).to.equal(&apos;function&apos;); chai_1.expect(offEventName).to.equal(onEventName); chai_1.expect(offHandler).to.equal(onHandler); }); it(&apos;should error on invalid event targets&apos;, function () { var obj = { addListener: function () { //noop } }; var subscribe = function () { return Observable.fromEvent(obj, &apos;click&apos;).subscribe(); }; chai_1.expect(subscribe).to.throw(TypeError, &apos;Invalid event target&apos;); }); it(&apos;should pass through options to addEventListener&apos;, function () { var actualOptions; var expectedOptions = { capture: true, passive: true }; var obj = { addEventListener: function (a, b, c) { actualOptions = c; }, removeEventListener: function (a, b, c) { //noop } }; var subscription = Observable.fromEvent(obj, &apos;click&apos;, expectedOptions) .subscribe(function () { //noop }); subscription.unsubscribe(); chai_1.expect(actualOptions).to.equal(expectedOptions); }); it(&apos;should pass through events that occur&apos;, function (done) { var send; var obj = { on: function (name, handler) { send = handler; }, off: function () { //noop } }; Observable.fromEvent(obj, &apos;click&apos;).take(1) .subscribe(function (e) { chai_1.expect(e).to.equal(&apos;test&apos;); }, function (err) { done(new Error(&apos;should not be called&apos;)); }, function () { done(); }); send(&apos;test&apos;); }); it(&apos;should pass through events that occur and use the selector if provided&apos;, function (done) { var send; var obj = { on: function (name, handler) { send = handler; }, off: function () { //noop } }; function selector(x) { return x + &apos;!&apos;; } Observable.fromEvent(obj, &apos;click&apos;, selector).take(1) .subscribe(function (e) { chai_1.expect(e).to.equal(&apos;test!&apos;); }, function (err) { done(new Error(&apos;should not be called&apos;)); }, function () { done(); }); send(&apos;test&apos;); }); it(&apos;should not fail if no event arguments are passed and the selector does not return&apos;, function (done) { var send; var obj = { on: function (name, handler) { send = handler; }, off: function () { //noop } }; function selector() { //noop } Observable.fromEvent(obj, &apos;click&apos;, selector).take(1) .subscribe(function (e) { chai_1.expect(e).not.exist; }, function (err) { done(new Error(&apos;should not be called&apos;)); }, function () { done(); }); send(); }); it(&apos;should return a value from the selector if no event arguments are passed&apos;, function (done) { var send; var obj = { on: function (name, handler) { send = handler; }, off: function () { //noop } }; function selector() { return &apos;no arguments&apos;; } Observable.fromEvent(obj, &apos;click&apos;, selector).take(1) .subscribe(function (e) { chai_1.expect(e).to.equal(&apos;no arguments&apos;); }, function (err) { done(new Error(&apos;should not be called&apos;)); }, function () { done(); }); send(); }); it(&apos;should pass multiple arguments to selector from event emitter&apos;, function (done) { var send; var obj = { on: function (name, handler) { send = handler; }, off: function () { //noop } }; function selector(x, y, z) { return [].slice.call(arguments); } Observable.fromEvent(obj, &apos;click&apos;, selector).take(1) .subscribe(function (e) { chai_1.expect(e).to.deep.equal([1, 2, 3]); }, function (err) { done(new Error(&apos;should not be called&apos;)); }, function () { done(); }); send(1, 2, 3); }); }); //# sourceMappingURL=fromEvent-spec.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>