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PHP - AJAX


Learn PHP Classic by building a web site from scratch.

Part V: Displaying Data Using AJAX.


What We Will Do

In this chapter we will:

  • Displaing data from the database using AJAX

Create an AJAX Server Page

In your web folder (DemoPHP), create a new PHP file named "getCustomers.php".

Put the following code inside the PHP file:

getCustomers.php

<?php
header('Content-Type: text/html; charset=ISO-8859-1');

//create an ADO connection and open the database
$conn = new COM("ADODB.Connection");
$conn->open("PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=C:\WebData\Northwind.mdb");

//execute an SQL statement and return a recordset
$rs = $conn->execute("SELECT CompanyName, City, Country FROM Customers");
$num_columns = $rs->Fields->Count();

echo "<table border='1'>";
echo "<tr><th>Name</th><th>City</th><th>Country</th></tr>";
while (!$rs->EOF) //looping through the recordset (until End Of File)
{
echo "<tr>";
for ($i=0; $i < $num_columns; $i++) {
echo "<td>" . $rs->Fields($i)->value . "</td>";
}
echo "</tr>";
$rs->MoveNext();
}
echo "</table>";

//close the recordset and the database connection
$rs->Close();
$rs = null;
$conn->Close();
$conn = null;
?>

The file above is a standard PHP file, returning only an HTML table.


Create an AJAX Browser Page

In your "DemoPHP" folder, create a new file named "Ajax.html".

Put the following code inside the file:

Ajax.html

<!DOCTYPE html>
<html>
<head>
<title>ASP Demo</title>
<link href="Site.css" rel="stylesheet">
</head>
<body>
<div id="main">
<h1>Customers</h1>
<div id="t01"></div>
</div>

<script>
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("t01").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getCustomers.php",true);
xmlhttp.send();
</script>

</body>
</html>

Try it Yourself »


Congratulations

You have created your first data page using AJAX.



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