jQuery wrap elements

The following jquery methods are used to wrap and unwrap elements. Since these methods modify DOM, they belong to DOM manipulation category.
wrap
unwrap
wrapAll
wrapInner

wrap - Wrap an HTML structure around each element in the set of matched elements.

Consider the following HTML
<div id="div1">
    DIV 1
</div>
<div id="div2">
    DIV 2
</div>
<div id="div3">
    DIV 3
</div>

The following line of code wraps each of the above div element with another div element.
$('div').wrap('<div class="containerDiv"></div>');

So the HTML in the DOM would now look as shown below. To view the DOM HTML use the browser developer tools.
<div class="containerDiv">
    <div id="div1">
        DIV 1
    </div>
</div>
<div class="containerDiv">
    <div id="div2">
        DIV 2
    </div>
</div>
<div class="containerDiv">
    <div id="div3">
        DIV 3
    </div>
</div>

Example : 
<html>
<head>
    <title></title>
    <style>
        .containerDiv {
            background-color: red;
            color: white;
            font-weight: bold;
            margin: 5px;
        }
    </style>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            alert($('div.containerDiv').length);
            $('div').wrap('<div class="containerDiv"></div>');
            alert($('div.containerDiv').length);
        });
    </script>
</head>
<body style="font-family:Arial">
    <div id="div1">
        DIV 1
    </div>
    <div id="div2">
        DIV 2
    </div>
    <div id="div3">
        DIV 3
    </div>
</body>
</html>

Output :  
jquery wrap element 

unwrap - Remove the parents of the set of matched elements from the DOM.

Example : 
<html>
<head>
    <title></title>
    <style>
        .containerDiv {
            background-color: red;
            color: white;
            font-weight: bold;
            margin: 5px;
        }
    </style>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            alert($('div.containerDiv').length);
            $('div').wrap('<div class="containerDiv"></div>');
            alert($('div.containerDiv').length);
            $('div').unwrap();
            alert($('div.containerDiv').length);
        });
    </script>
</head>
<body style="font-family:Arial">
    <div id="div1">
        DIV 1
    </div>
    <div id="div2">
        DIV 2
    </div>
    <div id="div3">
        DIV 3
    </div>
</body>
</html>

wrapAll - Wrap an HTML structure around all elements in the set of matched elements.

Consider the following HTML
<div id="div1">
    DIV 1
</div>
<div id="div2">
    DIV 2
</div>
<div id="div3">
    DIV 3
</div>

The following line of code wraps all of the matching div element with another div element.
$('div').wrapAll('<div class="containerDiv"></div>');

So the HTML in the DOM would now look as shown below.
<div class="containerDiv">
    <div id="div1">
        DIV 1
    </div><div id="div2">
        DIV 2
    </div><div id="div3">
        DIV 3
    </div>
</div>

Example : 
<html>
<head>
    <title></title>
    <style>
        .containerDiv {
            background-color: red;
            color: white;
            font-weight: bold;
            margin: 5px;
        }
    </style>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            alert($('div.containerDiv').length);
            $('div').wrapAll('<div class="containerDiv"></div>');
            alert($('div.containerDiv').length);
            $('div').unwrap();
            alert($('div.containerDiv').length);
        });
    </script>
</head>
<body style="font-family:Arial">
    <div id="div1">
        DIV 1
    </div>
    <div id="div2">
        DIV 2
    </div>
    <div id="div3">
        DIV 3
    </div>
</body>
</html>

wrapInner - Wrap an HTML structure around the content of each element in the set of matched elements.

Consider the following HTML
<div id="div1">
    DIV 1
</div>
<div id="div2">
    DIV 2
</div>
<div id="div3">
    DIV 3
</div>

The following line of code wraps each of the above div element content with another div element.
$('div').wrapInner('<div class="containerDiv"></div>');

So the HTML in the DOM would now look as shown below.
<div id="div1">
    <div class="containerDiv">
        DIV 1
    </div>
</div>
<div id="div2">
    <div class="containerDiv">
        DIV 2
    </div>
</div>
<div id="div3">
    <div class="containerDiv">
        DIV 3
    </div>
</div>

Example : 
<html>
<head>
    <title></title>
    <style>
        .containerDiv {
            background-color: red;
            color: white;
            font-weight: bold;
            margin: 5px;
        }
    </style>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('div').wrapInner('<div class="containerDiv"></div>');
        });
    </script>
</head>
<body style="font-family:Arial">
    <div id="div1">
        DIV 1
    </div>
    <div id="div2">
        DIV 2
    </div>
    <div id="div3">
        DIV 3
    </div>
</body>
</html>

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