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HTML DOM insertBefore() Method in JAVA SCRIPT

Definition and Usage..
The insertBefore() method inserts a node as a child, right before an existing child, which you specify.
Tip: If you want to create a new list item, with text, remember to create the text as a Text node which you append to the
  • element, then insert
  • to the list.
    Syntax: node.insertBefore(newnode, existingnode)
    Different way to how to declare insertBefore() Method in program.
    • CODING:
    <!DOCTYPE html>
    <html>
    <body>
    <ul id="myList">
      <li>JAVA</li>
      <li>PYTHON</li>
    </ul>
    <p>Click the button to insert an item to the list.</p>
    <button onclick="ADDElmnt()">ADD</button>
    <ul id="List1"><li>HTML</li><li>CSS</li></ul>
    <ul id="List2"><li>JAVA SCRIPT</li><li>SQL</li></ul>
    <button onclick="ADD()">ADD</button>
    <script>
    function ADDElmnt() {
        var newItem = document.createElement("LI");
        newItem.innerHTML="C++";
        var list = document.getElementById("myList");
        list.insertBefore(newItem, list.childNodes[0]);
    }
    function ADD() {
        var node =document.getElementById("List2").lastChild;
    //firstChild,childNodes[0]
        var list = document.getElementById("List1");
        list.insertBefore(node,list.firstChild);//list.childNodes[0],list.lastChild
    }
    </script>
    </body>
    </html>

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