[javascript] How to check whether dynamically attached event listener exists or not?

I usually attach a class to the element then check if the class exist like this:

let element = document.getElementsById("someElement");

if(!element.classList.contains('attached-listener'))
   element.addEventListener("click", this.itemClicked);

element.classList.add('attached-listener');

Examples related to javascript

need to add a class to an element How to make a variable accessible outside a function? Hide Signs that Meteor.js was Used How to create a showdown.js markdown extension Please help me convert this script to a simple image slider Highlight Anchor Links when user manually scrolls? Summing radio input values How to execute an action before close metro app WinJS javascript, for loop defines a dynamic variable name Getting all files in directory with ajax

Examples related to testing

Test process.env with Jest How to configure "Shorten command line" method for whole project in IntelliJ Jest spyOn function called Simulate a button click in Jest Mockito - NullpointerException when stubbing Method toBe(true) vs toBeTruthy() vs toBeTrue() How-to turn off all SSL checks for postman for a specific site What is the difference between smoke testing and sanity testing? ReferenceError: describe is not defined NodeJs How to properly assert that an exception gets raised in pytest?

Examples related to addeventlistener

How to bind event listener for rendered elements in Angular 2? Dynamically add event listener Cannot read property 'addEventListener' of null Why doesn't document.addEventListener('load', function) work in a greasemonkey script? How to check whether dynamically attached event listener exists or not? Javascript: Uncaught TypeError: Cannot call method 'addEventListener' of null addEventListener not working in IE8 How to remove all listeners in an element? Binding multiple events to a listener (without JQuery)? addEventListener in Internet Explorer

Examples related to dom-events

Detecting real time window size changes in Angular 4 Does Enter key trigger a click event? What are passive event listeners? Stop mouse event propagation React onClick function fires on render How do you Hover in ReactJS? - onMouseLeave not registered during fast hover over iFrame onload JavaScript event addEventListener, "change" and option selection Automatically pass $event with ng-click? JavaScript click event listener on class