javascript parameter to add document queryselector class code example

Example 1: add class queryselector

const element = document.querySelector("#box");

element.classList.add("class-name");

Example 2: queryselector name attribute

document.querySelectorAll('[property]'); // All with attribute named "property"
document.querySelectorAll('[property="value"]'); // All with "property" set to "value" exactly.

Example 3: javascript queryselector

//Pretend there is a <p> with class "example"
const myParagraph = document.querySelector('.example');
//You can do many this with is
myParagraph.textContent = 'This is my new text';

Example 4: add class queryselector

<div id="box"></div>