AJAX and PHP

Chapter 9
}
// continue if the process is completed
if (xmlHttp.readyState == 4)
{
// continue only if HTTP status is "OK"
if (xmlHttp.status == 200)
{
try
{
displayFeed();
}
catch(e)
{
// display error message
displayError(e.toString());
}
}
else
{
displayError(xmlHttp.statusText);
}
}
// Processes server's response
function displayFeed()
{
// read server response as text, to check for errors
var response = xmlHttp.responseText;
// server error?
if (response.indexOf("ERRNO") >= 0
|| response.indexOf("error:") >= 0
|| response.length == 0)
throw(response.length == 0 ? "Void server response." : response);
// hide the "Loading..." message upon feed retrieval
document.getElementById("loading").style.display = "none";
// append XSLed XML content to existing DOM structure
var titlesContainer = document.getElementById("feedContainer");
titlesContainer.innerHTML = response;
// make the feed container visible
document.getElementById("feedContainer").style.display = "block";
// clear home page text
document.getElementById("home").innerHTML = "";
}
9. Create a new file named rss_reader.css, and add this code to it:
body
{
font-family: Arial, Helvetica, sans-serif;
font-size: 12px;
}
h1
{
color: #ffffff;
background-color: #3366CC;
padding: 5px;
}
h2
{
margin-top: 0px;
}
h3
{
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