En su archivo index.php
<!doctype html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<a href="javascript:void(0)" onClick="updateId('1')">Id 1</a>
<a href="javascript:void(0)" onClick="updateId('2')">Id 2</a>
<a href="javascript:void(0)" onClick="updateId('3')">Id 3</a>
</body>
</html>
<script>
function updateId(id)
{
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
alert(xmlhttp.responseText);
}
};
xmlhttp.open("GET", "update.php?id=" +id, true);
xmlhttp.send();
}
</script>
Y en tu update.php
<?php
if(isset($_GET['id']) && !empty($_GET['id']))
{
$id = $_GET['id'];
include('database_connection.php');
$update = "UPDATE id SET id = id + 1 WHERE id = '".$id."'";
if (mysqli_query($connect, $update))
{
echo "Record updated successfully";
}
else
{
echo "Error updating record: " . mysqli_error($connect);
}
die;
}
?>
