You can call querySelectorAll () on all elements with a specific class, then use forEach () to iterate on them: document.querySelectorAll('.some-class').forEach(item => { item.addEventListener('click', event => { }) }) If you don’t have a common class for your elements you can build an array on the fly:
With addEventListener , we can add and remove the listener. And should return or yield undefined since they’re done automatically.
So we should use the key property to check for key codes. The JavaScript addEventListener () method allows you to set up functions to be called when a specified event happens, such as when a user clicks a button. Loops and other array methods are better than reduce since the code is more readable. We can also specify capture mode rather than bubbling. We don’t need a function that return undefined . The EventTargetmethod addEventListener()sets up a function that will be called whenever the specified event is delivered to the target. In this article, we’ll look at some best practices we should follow to make everyone’s lives easier. We should have proper casing for numeric literals. Let’s see how to build a simple REST api using Express to allow for all of the CRUD operations. reduce and reduceRight make code hard to read.
And confusion with correct event names is eliminated. allButtonsOnPage.forEach(function(button, index) { button.addEventListener(‘click’, function() { logButtonIndex(index); }); }); Instead of using the setAttribute property to set custom attributes, we can use the dataset property instead. It exists the program abruptly without giving it a chance to clean up.
Understanding Events and Event Handlers Common targets are Element, Document, and Window, but the target may be any object that supports events (such as XMLHttpRequest).
foo.removeEventListener('click', onClick); window.addEventListener('keydown', event => {. Also, we can register an unlimited number of handlers. Building a JavaScript Monorepo with Lerna, What are these strict compiler options in TypeScript: Part 1.
Enjoyed this article? Also, we should use addEventListener and removeEventListener instead of using on functions. The keyCode property is deprecated.
It also separates logic from the document structure.
Definition and Usage. We should use undefined instead of null . Using undefined for everything is better than using null and undefined . The document.addEventListener() method attaches an event handler to the document. This tutorial shows you how you can implement addEventListener () in your code. Tip: Use the document.removeEventListener() method to remove an event handler that has been attached with the addEventListener() method. This example demonstrates how to add two click events on the same