sharpener_demo/dom_modification.html at main · sanjeevWeb/sharpener_demo · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
  <title>Item Lister</title>
</head>
<body>
  <header id="main-header" class="bg-success text-white p-4 mb-3">
    <div class="container">
      <h1 id="header-title">Item Lister <span style="display:none">123</span></h1>
    </div>
  </header>
  <div class="container">
   <div id="main" class="card card-body">
    <h2 class="title">Add Items</h2>
    <form class="form-inline mb-3">
      <input type="text" class="form-control mr-2">
      <input type="submit" class="btn btn-dark" value="Submit">
    </form>
    <h2 class="title">Items</h2>
    <ul id="items" class="list-group">
      <li class="list-group-item">Item 1</li>
      <li class="list-group-item">Item 2</li>
      <li class="list-group-item">Item 3</li>
      <li class="list-group-item">Item 4</li>
    </ul>
	<span></span>
   </div>
  </div>
<script>
	var ele = document.querySelector('#items');
	//console.log(ele.parentNode);
	//ele.parentNode.style.backgroundColor = '#f4f4f4';

	//console.log(ele.parentNode.parentNode);

	// parentNode and parentElement can be used interchangibly
	// text Node  represents a line break or whitespace
	//console.log(ele.childNodes);

	// use children instead of childNode , it avoids text nodes
	//console.log(ele.children);
	//console.log(ele.children[1]);
	//ele.children[1].style.backgroundColor = 'yellow';

	//firstChild return the text node as well so use firstElementChild
	//console.log(ele.firstChild);
	//console.log(ele.firstElementChild);
	//ele.firstElementChild.textContent = 'hello';

	//lastChild return the text node as well so use lastElementChild
	//console.log(ele.lastChild);
	//console.log(ele.lastElementChild);
	//ele.lastElementChild.textContent = 'hello again';

	// nextSibling and nextElementSibling

	//console.log(ele.nextSibling);
	//console.log(ele.nextElementSibling);

	//console.log(ele.previousSibling);
	//console.log(ele.previousElementSibling);
	//ele.previousElementSibling.style.color = 'green';

	var newdiv = document.createElement('div');
	newdiv.className = 'hello';
	newdiv.id = 'hello1';

	newdiv.setAttribute('title','i am div');

	var divText = document.createTextNode('Hello World');
	newdiv.appendChild(divText);
	console.log(newdiv);

	var container = document.querySelector('header .container');
	var h1 = document.querySelector('header h1');

	container.insertBefore(newdiv,h1);

	//var newLi = document.createElement('div');
	//newdiv.className = 'hello';
	let liContainer = document.querySelector('.list-group');
	let li = document.querySelector('li:nth-child(1)');

	liContainer.insertBefore(newdiv,li);
</script>
</body>
</html>