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INTERVIEW QUESTION:

What is jQuery?

Posted by Chris Adams

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ANSWER

As business and systems analysts sometimes it takes us a bit longer to learn about the latest technology available to developers. It is, however, advantageous for us to learn about the technological capabilities that are available to them, at least at a high level.

jQuery is a lightweight Javascript library containing functions that can be leveraged easily by a developer to quickly created dynamic webpage features and functionality. jQuery gives the developer the ability to:

Select elements within an HTML page
Run jQuery functions to manipulate the HTML, changing how the webpage appears.
Run jQuery functions to manipulate the CSS sytles

Before adding any jQuery scripts to the webpage the developer must first reference the jQuery library in the <head> tag of the HTML page using something like the following.

<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js">
</script>
</head>

Then jQuery scripts that should run on the page can be added.

<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js">
</script>
<script type="text/javascript">
$(document).ready(function(){
$("p.testclass").click(function(){
$(this).fadeOut(4000);
});
});</script>
</head>

<body>
<p class="testclass">This is paragraph 1.</p>
<p> This is paragraph 2.</p>
</body>
</html>

This script would wait until the document is fully loaded and apply a jQuery function to the paragraph with class=testclass so that when the paragraph text is clicked the paragraph will slowly fade away or disappear.

HTML and CSS elements can be selected in 1 of 4 ways:

$("p") - selects all <p> elements
$("p.testclass") - selects all <p> elements with class="testclass"
$("p#testid") - selects the first <p> element with id="testid"
$(this) - selects the current HTML element

There are a large number of jQuery functions that can be ran on HTML and CSS elements once they are selected.

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