6CS028 Workshop - Ajax
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The web page:
<HTML>
<HEAD>
<TITLE>Test Ajax</TITLE>
<SCRIPT type="text/javascript" src="ajax.js"></SCRIPT>
</HEAD>
<BODY>
Check name: <INPUT type="text" id="a_name" onblur="send_request(this);">
<DIV id="div_result"></DIV>
</BODY>
</HTML>
The Javascript file:
var liveSearchReq = false;
var name = "";
var isIE = false;
// on !IE we only have to initialize it once
if (window.XMLHttpRequest)
{
liveSearchReq = new XMLHttpRequest();
}
// +----------------------------------------------------------------------+
// | Init HTTP object
// +----------------------------------------------------------------------+
function initliveSearchReq()
{
if(window.XMLHttpRequest)
{
// Firefox et autres
liveSearchReq = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
// Internet Explorer
try
{
liveSearchReq = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
liveSearchReq = new ActiveXObject("Microsoft.XMLHTTP");
}
}
}
// +----------------------------------------------------------------------+
// | Send request
// +----------------------------------------------------------------------+
function send_request(t)
{
// Get user input
name = t.value;
if(name!="")
{
// Create HTTP object
initliveSearchReq();
// Set function to handle response
liveSearchReq.onreadystatechange= DisplayResult;
// Send request
liveSearchReq.open("GET", "ajax.php?name=" + name);
// Finish transaction
liveSearchReq.send(null);
}
else
{
var sh = document.getElementById("div_result");
sh.innerHTML = "Please enter value";
}
}
// +----------------------------------------------------------------------+
// | Handle response
// +----------------------------------------------------------------------+
function DisplayResult()
{
if (liveSearchReq.readyState == 4)
{
var sh = document.getElementById("div_result");
sh.innerHTML = liveSearchReq.responseText;
}
}
The PHP file:
<?
// Get value coming from request
$name = $_GET['name'];
// Connect to DB
// Check if name exists in table
if($name=="Alix")
echo("This name is in the database");
else
echo("This name is NOT in the database :(");
//Close connection
?>
