What is the thing instead of document.getElementById it's for a class?

Question

Can you understand my question?😂😬

Answer 1

If you want to access class .blk elements

For a single element class, you can use
document.querySelector(".blk")
to get the first element with class .blk

For multi elements with the same class, you can use
document.querySelectorAll(".blk")
to get all the elements with class .blk (output in array elements)

for example
document.querySelectorAll(".blk")[0] would let you get the first element of all the .blk elements

document.querySelectorAll(".blk")[1] would let you get the second element of all the .blk elements

and so on... until the last element, document.querySelectorAll(".blk")[n-1]

where n is total numbers of elements with class .blk

Similarly for html tags,
document.querySelectorAll("div") would get all the div tag elements

document.querySelectorAll("h1") would get all the h1 tag elements

It can also access #id element, with document.querySelector("#id)

Since #id is an unique element in one document, you do not need to use method document.querySelectorAll

Answer 2

getElementsByClassName("class_name");