Answers for "how to add multiple event listeners in onclick javascript"

add event listener to multiple element in JS

document.querySelectorAll('.some-class').forEach(item => {
  item.addEventListener('click', event => {
    //handle click
  })
})

javascript add onclick to multiple elements

const arrayOfElements = document.querySelectorAll(".classNameToAddOnClickTo")
arrayOfElements.forEach(x => x.setAttribute("onclick", "methodToCall(this.id)"))