How to create AJAX with PHP

How to create AJAX with PHP

In this article, you will learn How to create AJAX with PHP.

Example:-

index.php

<html>
<head>
<title>AJAX with PHP</title>
<script>
function showHint(str) {
    if (str.length == 0) { 
        document.getElementById("txtHint").innerHTML = "";
        return;
    } else {
        var xmlhttp = new XMLHttpRequest();
        xmlhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                document.getElementById("txtHint").innerHTML = this.responseText;
            }
        }
        xmlhttp.open("GET", "hint.php?q="+str, true);
        xmlhttp.send();
    }
}
</script>
</head>
<body>

<p><b>Enter name in the input field</b></p>
<form> 
First name:- <input type="text" onkeyup="showHint(this.value)">
</form>
<p>Suggestions:- <span id="txtHint"></span></p>
</body>
</html>

hint.php

<?php
$a[] = "Aman";
$a[] = "Babbu";
$a[] = "Chetna";
$a[] = "Deepak";
$a[] = "Ehsab";
$a[] = "Farhan";
$a[] = "Gurdeep";
$a[] = "Harman";
$a[] = "Inayat";
$a[] = "Jeevan";
$a[] = "Kittu";
$a[] = "Laddi";
$a[] = "Navdeep";
$a[] = "Opera";
$a[] = "Preet";
$a[] = "ram";
$a[] = "Rahul";
$a[] = "Vikram";

$q = $_REQUEST["q"];
$hint = "";
if ($q !== "") {
    $q = strtolower($q);
    $len=strlen($q);
    foreach($a as $name) {
        if (stristr($q, substr($name, 0, $len))) {
            if ($hint === "") {
                $hint = $name;
            } else {
                $hint .= ", $name";
            }
        }
    }
}
echo $hint === "" ? "no suggestion" : $hint;
?>

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