Source code for the sample Ajax application - AJAX

Google's Ajax Libraries API is a programming interface that permits web developers to download popular JavaScript packages, such as Prototype, jQuery and Scriptaculous, directly from Google’s servers instead of using local copies of these libraries. In this fourth part of a four-part series on using the API, you'll learn how to serve the jQuery framework without compression.

TABLE OF CONTENTS:

By: Alejandro Gervasio

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January 26, 2009

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In the section that you just read, I explained how to develop a primitive Ajax application that uses the Goggle API to download the jQuery library without using compression. Nevertheless, this application would look rather incomplete if I didn’t list the signature of its remaining source files.

So, here they are:

(definition for 'ajax_file_reader.htm' file)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<head>

<title>Reading file contents with jQuery library (uses Google API)</title>

body{

padding: 0;

margin: 0;

background: #fff;

}

h1{

font: bold 18pt Arial, Helvetica, sans-serif;

color: #000;

}

#filecontents{

width: 600px;

padding: 10px;

border: 1px solid #999;

font: normal 10pt Arial, Helvetica, sans-serif;

color: #000;

}

</style>

// load jQuery library with Google API (loads uncompressed source file)

google.load("jquery","1.2",{uncompressed:true});

google.setOnLoadCallback(function(){

$("#btn").click(function(){

$.get("read_file.php",function(fileContents){$("#filecontents").html(fileContents);});

});

</script>

</head>

<body>

<h1 id="header">Reading file contents with jQuery library (uses Google API)</h1>

</body>

</html>

definition for 'read_file.php' file)

<?php

if(!$contents=file_get_contents('data.txt')){

trigger_error('Error reading file contents',E_USER_ERROR);

}

echo $contents;

(definition for 'data.txt' file)

These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file. These are contents of sample file.

Now that you have at your disposal the entire source code of the above Ajax program, surely you’ll be able to test much more easily how long it takes to run when the jQuery library is delivered compressed and uncompressed from Google’s servers. Whether you decide to employ this Google API or not, one thing is certain: you'll have fun playing around with it!

Final thoughts

After this long and hopefully instructive journey, we’ve come to the end of the series. As was demonstrated by the code samples included in the different tutorials, learning to use Google's Ajax Libraries API is really very simple. The whole process is reduced to working with a couple of JavaScript methods and nothing else. Now, it’s up to you to decide whether or not to use this API when working with your preferred JavaScript package.

See you in the next tutorial!