appendchild after element code example

Example 1: append after javascript

//insert new Element after some reference Element
function insertAfter(newElement, referenceElement) {
    referenceElement.parentNode.insertBefore(newElement, referenceElement.nextSibling);
}

//example usage
var newElement = document.createElement("div");
    newElement.innerHTML = "my New Div Text";
var myCurrentElement= document.getElementById("myElementID");
    insertAfter(newElement, myCurrentElement);

Example 2: append sibling javascript after first child

function insertAfter(newNode, referenceNode) {
    referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}

Example 3: appendchild element once if element presense in js

<script>
       var button = false;
        function  myfun(){
            if ( button === false){
                var b1 = document.createElement("BUTTON");
                b1.innerHTML = "Click Me";
                document.body.appendChild(b1); 
                return button = true;  
            }
      }
    </script>