Rameshwar-ghodke/fetch information from a database with AJAX:

## fetch information from a database with AJAX:
<html>
<head>
<script>
function showUser(str) {
    if (str == "") {
        document.getElementById("txtHint").innerHTML = "";
        return;
    } else {
        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 (this.readyState == 4 && this.status == 200) {
                document.getElementById("txtHint").innerHTML = this.responseText;
            }
        };
        xmlhttp.open("GET","getuser.php?q="+str,true);
        xmlhttp.send();
    }
}
</script>
</head>
<body>

<form>
<select name="users" onchange="showUser(this.value)">
  <option value="">Select a person:</option>
  <option value="1">Peter Griffin</option>
  <option value="2">Lois Griffin</option>
  <option value="3">Joseph Swanson</option>
  <option value="4">Glenn Quagmire</option>
  </select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>

</body>
</html>

//************************* PHP File getuser.php **********************************************

<!DOCTYPE html>
<html>
<head>
<style>
table {
    width: 100%;
    border-collapse: collapse;
}

table, td, th {
    border: 1px solid black;
    padding: 5px;
}

th {text-align: left;}
</style>
</head>
<body>

<?php
$q = intval($_GET['q']);

$con = mysqli_connect('localhost','peter','abc123','my_db');
if (!$con) {
    die('Could not connect: ' . mysqli_error($con));
}

mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM user WHERE id = '".$q."'";
$result = mysqli_query($con,$sql);

echo "<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
<th>Hometown</th>
<th>Job</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
    echo "<tr>";
    echo "<td>" . $row['FirstName'] . "</td>";
    echo "<td>" . $row['LastName'] . "</td>";
    echo "<td>" . $row['Age'] . "</td>";
    echo "<td>" . $row['Hometown'] . "</td>";
    echo "<td>" . $row['Job'] . "</td>";
    echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
</body>
</html>
	<html>
	<head>
	<script>
	function showUser(str) {
	if (str == "") {
	document.getElementById("txtHint").innerHTML = "";
	return;
	} else {
	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 (this.readyState == 4 && this.status == 200) {
	document.getElementById("txtHint").innerHTML = this.responseText;
	}
	};
	xmlhttp.open("GET","getuser.php?q="+str,true);
	xmlhttp.send();
	}
	}
	</script>
	</head>
	<body>

	<form>
	<select name="users" onchange="showUser(this.value)">
	<option value="">Select a person:</option>
	<option value="1">Peter Griffin</option>
	<option value="2">Lois Griffin</option>
	<option value="3">Joseph Swanson</option>
	<option value="4">Glenn Quagmire</option>
	</select>
	</form>
	<br>
	<div id="txtHint"><b>Person info will be listed here...</b></div>

	</body>
	</html>

	//*********************** PHP File getuser.php ********************************************

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	table {
	width: 100%;
	border-collapse: collapse;
	}

	table, td, th {
	border: 1px solid black;
	padding: 5px;
	}

	th {text-align: left;}
	</style>
	</head>
	<body>

	<?php
	$q = intval($_GET['q']);

	$con = mysqli_connect('localhost','peter','abc123','my_db');
	if (!$con) {
	die('Could not connect: ' . mysqli_error($con));
	}

	mysqli_select_db($con,"ajax_demo");
	$sql="SELECT * FROM user WHERE id = '".$q."'";
	$result = mysqli_query($con,$sql);

	echo "<table>
	<tr>
	<th>Firstname</th>
	<th>Lastname</th>
	<th>Age</th>
	<th>Hometown</th>
	<th>Job</th>
	</tr>";
	while($row = mysqli_fetch_array($result)) {
	echo "<tr>";
	echo "<td>" . $row['FirstName'] . "</td>";
	echo "<td>" . $row['LastName'] . "</td>";
	echo "<td>" . $row['Age'] . "</td>";
	echo "<td>" . $row['Hometown'] . "</td>";
	echo "<td>" . $row['Job'] . "</td>";
	echo "</tr>";
	}
	echo "</table>";
	mysqli_close($con);
	?>
	</body>
	</html>