add attribute js code example

Example 1: javascript change attribute

var element = document.getElementById("elemId");
element.setAttribute("attributeName", "value");

Example 2: setAttribute()

element.setAttribute(name, value);
element.setAttribute("style", "background-color: red;");

Example 3: set attribute javascript

Element.setAttribute(name, value);

Example 4: put new attribute on html tag using javascript

// Here's what you do for the style attribute
span.setAttribute("style", "width:110%;float:center;left-margin:-10px;top-margin:-10;");

Example 5: set property dom javascrpt

document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");

Example 6: js setattribute

const link = document.querySelector('a');

console.log(link.getAttribute('href'));
link.setAttribute('href', 'https://yandex.ru');
link.innerText = 'The Next Link';

const mssg = document.querySelector('p');

console.log(mssg.getAttribute('class'));

mssg.setAttribute('class', 'success');
mssg.setAttribute('style', 'color: green;');