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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>AJAX Http Requests</h1>
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<h2>AJAX Uses HTTP Requests</h2>
<p>In traditional JavaScript coding, if you want to get any information from a database or a file on the server, or send
user information to a server, you will have to make an
HTML form and GET or POST data to the server. The user will have to click
the "Submit" button to send/get the information, wait for the server to respond, then a new page will load with the
results.</p>
<p>Because the server returns a new page each
time the user submits input, traditional web applications can
run slowly and tend to be less user-friendly.</p>
<p>With AJAX, your JavaScript communicates directly with the server, through the
JavaScript <b>XMLHttpRequest</b> object</p>
<p>With an HTTP request, a web page can make a request to, and get a response from a web
server - without reloading the page. The user will stay on the same page, and he
or she will
not notice that scripts request pages, or send data to a
server in the background.</p>
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<h2>The XMLHttpRequest Object</h2>
<p><b>By using the XMLHttpRequest object, a web developer can update a page with data from the server
after the page has loaded!</b></p>
<p>AJAX was made popular in 2005 by Google (with Google Suggest).</p>
<p><a target="_blank" href="../../www.google.com/webhp@complete=1&hl=en">Google Suggest</a>
is using the XMLHttpRequest object to create a very dynamic web interface:
When you start typing in Google's search box, a JavaScript sends the letters off
to a server and the server returns a list of suggestions.</p>
<p>The XMLHttpRequest object is supported in Internet Explorer 5.0+, Safari 1.2,
Mozilla 1.0 / Firefox, Opera 8+, and Netscape 7.</p>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
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