Answers for "javascript hide class on click"

javascript hide element by class

document.getElementsByClassName('class_name')[0].style.visibility='hidden';

how to hide javascript element by class

document.getElementsByClassName('className')[0].style.visibility='hidden';

js hide div

//If you have jquery, you can use the following method:
$("#mydiv").hide(); //hides div.
$("#mydiv").show(); //shows div.
//If you don't have jquery...
//search up the following: html how to add jquery