This tutorial is intended to give the reader some initial understanding of the power of using Ajax as a tool on a web page. The web pages are growing larger and larger due to more and more bandwidth around the globe.
This is nice since the web is getting more readable and more visual appealing. But if your web host have a traffic limit per day the size of the total files requested by each visitor becomes critical, at least if you have many visitors
.
Ajax is a way to update a part of a web page without the nessisity to reload the whole page
. This can save you a lot of bandwidth, if used wisely. So we are going to create a simple html page with dynamic content. We are going to use the prototype framework which is a javascript framefork for a numerous action, including Ajax calls. So start by downloading prototype.js and script.aculo.us. Place all the files on your server.
For this tutorial we are going to create three files:
- index.html
- tutorial.js
- page.html
Let’s start with the markup
index.html
<html>
<head>
<script src="js/prototype.js" type="text/javascript"></script>
<script src="js/scriptaculous.js" type="text/javascript"></script>
<script src="js/tutorial.js" type="text/javascript"></script>
</head>
<body>
<h1>This is a demo page using Ajax</h1>
<h2>Click on the link</h2>
<a href="javascript:getit();">Click me</a>
<div id="update"></div>
</body>
</html>
</pre>
We start by including all the nessesary javascript files, tutorial.js is our file we are about to create . All this page has is a link and a div. When the link is clicked the javacript function getit() is called and is located in tutorial.js
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</div>. So let's take a look at tutorial.js.
<cite>tutorial.js</cite>
<pre lang="javascript" line="1">
function getit(){
var url = "page.html";
new Ajax.Updater('update', url);
}
Small huh? Well since we are going to fetch data from another file we need to declare the file which in this case is page.html
. This is the page the Ajax.Updater is fetching for us and outputs it to the ‘update’ div without reloading the whole page. The Ajax.Updater takes two parameters which is the id of the div to be updated and an url from where we fetch our data.
page.html
<ul> <li>Apples</li> <li>Oranges</li> <li>Elephants</li> </ul>
All put together there is not much code to get this working and there are endless possibilities. I’ve set up a demo where you can see the action live. Good luck.
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18 years ago
Ajax Tutorial…
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Michal
18 years ago
Great tutorial, but I am a little confused. You say “…tutorial.js is our file we are about to create.” What is the tutorial.js? I am getting confused between the index.html file and the tutorial.js file? Is that the same file? Thanks, Michal
Fredrik Fahlstad
18 years ago
Michal: The tutorial.js and iindex.html are two diffrent files.
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