How to show a div as a popup without any click event in java script?

Question

I want to setup a popup with an event listener rather than using the onclick function. My project is a calender and when I select a day I want it to show a div as pop up.

Answer 1

This question is pretty basic, checkout W3School .

myFunction(){
...
}

var element = document.getElementById("myPopUp");
element.addEventListener("click", myFunction());