Undefined error in jQuery
One common mistake that can lead to the “undefined” error in jQuery is using the dot (.) operator instead of the plus (+) operator for string concatenation….
Targeting methods in Javascript (querySelector)
querySelector document.querySelector(CSS Selector) querySelectorAll document.querySelectorAll(CSS Selector) querySelector() The querySelector() method returns the first Element within the document that matches the specified selector, or group of selectors. It…