JQuery Using Selectors

Alten Chingumbra
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JQuery using selectors

In this article we will look how to use Jquery selectors available for accessing DOM.

So let's get started.

I create an HTML file and add downloaded jquery-1.4.2.min.js file to below html file named as JQuerySelectors.html.

JQuerySelectors.html

<html>
<head>
<title>JQuery Sample HTML Page</title>
<script src="jquery-1.4.2.min.js" type="text/javascript">
</script>
<script language="javascript" type="text/javascript">
$(document).ready(function() {
$('#div1').hide();
});
</script>
</head>
<body>
<div>
<div id="div1">This is a Section.</div>
<div>This is next Section.</div>
<div>This is Last Section.</div>
</div>
</body>
</html>

Here is a list of selectors, their syntax and brief description.

We can select elements based on attributes using below syntax:

$('div [attr-name^=test]') - Selects all div tags with attribute value equal to test.

Now, we will look into custom selectors provided by JQuery. Custom selectors starts with :. Few of them are :even, :odd, :eq etc. We can use :even, :odd for styling alternate rows in a table using below syntax:

$('tr:odd').addClass('alternate');// Adds CSS class
Or
$('tr:nth-child(even)').addClass('alternate');

We can use custom selectors with form's elements like checkbox, textbox etc as shown below:

$(':button:disabled') - Select all disabled buttons