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If I have an object that calls
addEventListener(Event.ENTER_FRAME, update);
addEventListener(Event.ENTER_FRAME, update);
will that add 2 listeners?
978
To check whether dynamically attached event listener exists or not with JavaScript, we can get and set the element's listener attribute. export const attachEvent = ( element: Element, eventName: string, callback: () => void ) => { if (element && eventName && element. getAttribute("listener") !== "true") { element.
If your event listener not working is dependent on some logic, whether it's about which element it'll listen on or if it's registered at all, the first step is to check that the listener is indeed added to the element. Using a breakpoint in the developer tools , a logpoint or console.
The addEventListener() is an inbuilt function in JavaScript which takes the event to listen for, and a second argument to be called whenever the described event gets fired. Any number of event handlers can be added to a single element without overwriting existing event handlers. Syntax: element.
Nope, they won't, so update will only be called once when the event triggers.
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