AJAX - Send a Request To a Server

The XMLHttpRequest object is used to exchange data with a server.

To send a request to a server, we use the open() and send() methods of the XMLHttpRequest object:

1 2	xhttp.open("GET", "ajax_info.txt", true); xhttp.send();

<html>

<head>

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", "gethint.php?q=" + str, true);

xmlhttp.send();

}

</script>

</head>

<body>

<p><b>Start typing a name in the input field below:</b></p>

<form>

First name: <input type="text" onkeyup="showHint(this.value)">

</form>

<p>Suggestions: <span id="txtHint"></span></p>

</body>

</html>

AJAX – Send a Request To a Server