AJAX MySQL Step By Step Tutorial - Part 3: Now, we create client side. Before read this post, make sure that you have read this post about AJAX PHP.
This complete code. Save it on "client_books.html" within www/test/ajax.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Ajax Client</title>
<script type="text/javascript">
var xmlHttp = createXmlHttpRequestObject();
// creates XMLHttpRequest Instance
function createXmlHttpRequestObject(){
// will store XMLHttpRequest object
// at here
var xmlHttp;
// works all exceprt IE6 and older
try
{
// try to create XMLHttpRequest object
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
// assume IE 6 or older
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){ }
}
// return object or display error
if (!xmlHttp)
alert("Error creating the XMLHttpRequest Object");
else
return xmlHttp;
}
function process()
{
if(xmlHttp)
{
try
{
xmlHttp.open("Get","server_books.php", true);
xmlHttp.onreadystatechange = handleRequestStateChange;
xmlHttp.send(null);
}
catch(e)
{
alert("Can't connect to server\n" + e.toString());
}
}
}
function handleRequestStateChange()
{
myDiv = document.getElementById("myDivElement");
if(xmlHttp.readyState == 1)
{
myDiv.innerHTML += "Request status: 1 (loading) <br/>";
}
else if (xmlHttp.readyState == 2)
{
myDiv.innerHTML += "Request status: 2 (loaded) <br/>";
}
else if (xmlHttp.readyState == 3)
{
myDiv.innerHTML += "Request status: 3 (interactive) <br/>";
}
else if (xmlHttp.readyState == 4)
{
if(xmlHttp.status == 200)
{
try
{
handleXMLData();
}
catch(e)
{
alert("Error reading the response: " + e.toString());
}
}
else
{
alert("Problem retrieving data:\n" + xmlHttp.statusText);
}
}
}
function handleXMLData()
{
var xmlResponse = xmlHttp.responseXML;
xmlRoot = xmlResponse.documentElement;
idArray = xmlRoot.getElementsByTagName("id");
titleArray = xmlRoot.getElementsByTagName("title");
authorArray = xmlRoot.getElementsByTagName("author");
var html = "";
for( var i=0; i<titleArray.length; i++)
{
html += idArray.item(i).firstChild.data + ", " + titleArray.item(i).firstChild.data + ", " + authorArray.item(i).firstChild.data + "<br/>";
}
myDiv = document.getElementById("myDivElement");
myDiv.innerHTML += "Request status: 4 (complete). <br />Server said: <br />";
myDiv.innerHTML += html;
}
</script>
</head>
<body onload="process()">
Our collections:
<div id="myDivElement" />
</body>
</html>
Test it. Point your browser to http://localhost/test/ajax/client_books.html. You may get:
