event-delegation

Vanilla JS event delegation – dealing with child elements of the target element

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Newer browsers Newer browsers support .matches: this.container.addEventListener(‘click’, function(e){ if (e.target.matches(‘#game-again,#game-again *’)) { e.stopPropagation(); self.publish(‘primo:evento’); } }); You can get the unprefixed version with var matches = document.body.matchesSelector || document.body.webkitMatchesSelector || document.body.mozMatchesSelector || document.body.msMatchesSelector || document.body.webkitMatchesSelector And then use .apply for more browsers (Still IE9+). Older browsers Assuming you have to support older browsers, you can … Read more

What is DOM Event delegation?

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DOM event delegation is a mechanism of responding to ui-events via a single common parent rather than each child, through the magic of event “bubbling” (aka event propagation). When an event is triggered on an element, the following occurs: The event is dispatched to its target EventTarget and any event listeners found there are triggered. … Read more

Delegation: EventEmitter or Observable in Angular

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Update 2016-06-27: instead of using Observables, use either a BehaviorSubject, as recommended by @Abdulrahman in a comment, or a ReplaySubject, as recommended by @Jason Goemaat in a comment A Subject is both an Observable (so we can subscribe() to it) and an Observer (so we can call next() on it to emit a new value). … Read more

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