jQuery Element Selector

To select the elements by tag name use jQuery Element Selector

Syntax : $(element)

$('td') // Selects all td elements
$('div a') // Select all anchor elements that are descendants of div element
$('div, span, a') // Selects all div, span and anchor elements

Alerts the total count of td elements on the page
<html>
<head>
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            alert($('td').length);
        });
    </script>
</head>
<body>
    <table style="border:1px solid black; border-collapse:collapse">
        <tr>
            <td>C#</td>
            <td>ASP.NET</td>
            <td>SQL Server</td>
        </tr>
        <tr>
            <td>ADO.NET</td>
            <td>jQuery</td>
            <td>JavaScript</td>
        </tr>
        <tr>
            <td>AJAX</td>
            <td>CSS</td>
            <td>HTML</td>
        </tr>
        <tr>
            <td>VB</td>
            <td>Dot NET</td>
            <td>Visual C++</td>
        </tr>
        <tr>
            <td>Oracle</td>
            <td>Java</td>
            <td>J2EE</td>
        </tr>
    </table>
    <br /><br />
    <div>
        DIV 1
        <br />
        <a href="http://pragimtech.com">PragimTech</a>
    </div>
    <br /><br />
    <a href="http://google.com">Google</a>
    <br /><br />
    <div>DIV 2</div>
    <br /><br />
    <span>SPAN 1</span>
    <br /><br />
    <div>DIV 3</div>
</body>
</html>

Selects all the tr elements on the page and changes their background colour to red
<script type="text/javascript">
    $(document).ready(function () {
        $('tr').css('background-Color', 'red');
    });
</script>

Alerts the HTML content of the table
<script type="text/javascript">
    $(document).ready(function () {
        alert($('table').html());
    });
</script>

Alerts the HTML content of each table row
<script type="text/javascript">
    $(document).ready(function () {
        $('table tr').each(function () {
            alert($(this).html());
        });
    });
</script>

Select and changes the background colour of all the div, span and anchor elements
<script type="text/javascript">
    $(document).ready(function () {
        $('div, span, a').css('background-Color', 'yellow');
    });
</script>

Select all anchor elements that are descendants of div element
<html>
<head>
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('div a').css('background-Color', 'yellow');
        });
    </script>
</head>
<body>
    <div>
        <a href="http://pragimtech.com">PragimTech</a>
    </div>
    <br />
    <a href="http://microsoft.com">Microsoft</a>
</body>
</html>

Changes the background color of even rows to gray and odd rows to yellow on both the tables.
<html>
<head>
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('tr:even').css('background-Color', 'gray');
            $('tr:odd').css('background-Color', 'yellow');
        });
    </script>
</head>
<body>
    <table id="table1" border="1">
        <tr>
            <td>C#</td>
            <td>ASP.NET</td>
            <td>SQL Server</td>
        </tr>
        <tr>
            <td>ADO.NET</td>
            <td>jQuery</td>
            <td>JavaScript</td>
        </tr>
        <tr>
            <td>AJAX</td>
            <td>CSS</td>
            <td>HTML</td>
        </tr>
        <tr>
            <td>VB</td>
            <td>Dot NET</td>
            <td>Visual C++</td>
        </tr>
        <tr>
            <td>Oracle</td>
            <td>Java</td>
            <td>J2EE</td>
        </tr>
    </table>
    <br />
    <table id="table2" border="1">
        <tr>
            <td>Mark</td>
            <td>Mary</td>
            <td>Mike</td>
        </tr>
        <tr>
            <td>John</td>
            <td>Jade</td>
            <td>Joy</td>
        </tr>
        <tr>
            <td>Rob</td>
            <td>Roy</td>
            <td>Rachel</td>
        </tr>
        <tr>
            <td>Sam</td>
            <td>Sara</td>
            <td>Smith</td>
        </tr>
        <tr>
            <td>Todd</td>
            <td>Tom</td>
            <td>Theo</td>
        </tr>
    </table>
</body>
</html>

To change the background color of even rows to gray and odd rows to yellow just for one of the table, use #id selector along with element selector.

<script type="text/javascript">
    $(document).ready(function () {
        $('#table1 tr:even').css('background-Color', 'gray');
        $('#table1 tr:odd').css('background-Color', 'yellow');
    });
</script>

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