how to check if document element exists javascript code example

Example 1: js check if dom element exists

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

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

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

Example 2: check if the element exists in javascript

var myEle = document.getElementById("myElement");
    if(myEle){
        var myEleValue= myEle.value;
    }