Answers for "check if html element exists"

js check if dom element exists

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

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

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

check if the element exists in javascript

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