83 lines
3.6 KiB
JavaScript
83 lines
3.6 KiB
JavaScript
/**
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* Analyzes events bound to DOM elements
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*/
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/* global Document: true, Element: true, window: true */
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exports.version = '0.4.a';
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exports.module = function(phantomas) {
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'use strict';
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phantomas.setMetric('eventsBound'); // @desc number of EventTarget.addEventListener calls
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phantomas.setMetric('eventsDispatched'); // @desc number of EventTarget.dispatchEvent calls
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phantomas.setMetric('eventsScrollBound'); // @desc number of scroll event bounds
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phantomas.once('init', function() {
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phantomas.evaluate(function() {
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(function(phantomas) {
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// spy calls to EventTarget.addEventListener
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// @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget.addEventListener
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function eventSpyBefore(eventType) {
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/* jshint validthis: true */
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var path = phantomas.getDOMPath(this);
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//phantomas.log('DOM event: "' + eventType + '" bound to "' + path + '"');
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phantomas.incrMetric('eventsBound');
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phantomas.addOffender('eventsBound', '"%s" bound to "%s"', eventType, path);
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phantomas.log('event ' + eventType + ' bound');
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phantomas.enterContext({
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type: 'addEventListener',
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callDetails: {
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context: {
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length: 1,
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elements: [path]
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},
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arguments: [eventType]
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},
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backtrace: phantomas.getBacktrace()
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});
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// count window.addEventListener('scroll', ...) - issue #508
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if (eventType === 'scroll' && (path === 'window' || path === '#document')) {
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phantomas.incrMetric('eventsScrollBound');
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phantomas.addOffender('eventsScrollBound', 'bound by %s on %s', phantomas.getBacktrace(), path);
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}
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}
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function eventSpyAfter(result) {
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phantomas.leaveContext();
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}
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phantomas.spy(Element.prototype, 'addEventListener', eventSpyBefore, eventSpyAfter);
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phantomas.spy(Document.prototype, 'addEventListener', eventSpyBefore, eventSpyAfter);
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phantomas.spy(window, 'addEventListener', eventSpyBefore, eventSpyAfter);
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// spy calls to EventTarget.dispatchEvent
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// @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget.dispatchEvent
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phantomas.spy(Element.prototype, 'dispatchEvent', function(ev) {
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/* jshint validthis: true */
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var path = phantomas.getDOMPath(this);
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phantomas.log('Core JS event: triggered "%s" on "%s"', ev.type, path);
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phantomas.incrMetric('eventsDispatched');
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phantomas.addOffender('eventsDispatched', '"%s" on "%s"', ev.type, path);
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});
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})(window.__phantomas);
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});
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});
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phantomas.on('report', function() {
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phantomas.evaluate(function() {
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(function(phantomas) {
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// Check if a window.onscroll function is defined
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if (typeof(window.onscroll) === "function") {
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phantomas.incrMetric('eventsScrollBound');
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phantomas.addOffender('eventsScrollBound', 'bound by %s on %s', '', 'window.onscroll');
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}
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}(window.__phantomas));
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});
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});
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};
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