how to check if an element exist in javascript code example

Example 1: js element exists

var element = document.getElementById("test");
    //If it isn't "undefined" and it isn't "null", then it exists.
if(typeof(element) != 'undefined' && element != null){
    alert('Element exists');
} else{
	alert('Element does not exist');
}

Example 2: js check if dom element exists

var myElement = document.getElementById("myElementID");

if(!myElement){
    //#myElementID element DOES NOT exist
}

if(myElement){
    //#myElementID element DOES exists
}