Remove event listener mdn code example
Example 1: javascript remove event listener
var someEventHander=function(event){
console.log("do something");
}
//add listener
document.getElementById("someid").addEventListener('click',someEventHander);
//remove listener
document.getElementById("someid").removeEventListener('click',someEventHander);
Example 2: removeEventListener
target.removeEventListener(type, listener[, options]);
target.removeEventListener(type, listener[, useCapture]);