I want to build a simple program using XMLHttpRequest to calculate the area of the triangle. I used this code for client-side;
<body>
<form>
<label for="txtLength">Length</label>
<input type="text" id="txtLength" name="txtLength"><br><br>
<label for="txtWidth">Width</label>
<input type="text" id="txtWidth" name="txtWidth"><br><br>
<input type="hidden" name="submitted" value="1">
<input type="button" name="Calculate" value="Calculate" onclick="calArea();">
</form><br><br>
<div id="showArea">Enter Values and click Calculate.</div>
<script type="text/javascript">
function calArea() {
var len = document.getElementById("txtLength").value;
var wid = document.getElementById("txtWidth").value;
var sub = 1;
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.readyState == 200) {
document.getElementById("showArea").innerHTML = xhttp.responseText;
}
};
xhttp.open("POST", "calculate_area.php", true);
xhttp.send(len&wid&sub);
}
</script>
</body>
This code is for the server side.
<?php
print_r($_POST);
if (isset($_POST['sub'])) {
$len = $_POST['len'];
$wid = $_POST['wid'];
$area = (($len*$wid)/2);
echo $area;
}
else{
echo "Not input detected.";
}
?>
Even tried so many codes, It doesn’t send the data to server side.
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Answer
I found the mistake. I was sending the parameters as part of the URL, but need to send them as part of the request body.
Client-side code;
function calArea() {
var len = document.getElementById("txtLength").value;
var wid = document.getElementById("txtWidth").value;
var sub = 1;
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("showArea").innerHTML = xhttp.responseText;
}
};
xhttp.open("POST", "calculate_area.php", true);
xhttp.setRequestHeader("Content-Type", "application/json");
xhttp.send(JSON.stringify({len: len, wid: wid, sub: sub}));
}
Server-side code;
if (isset($_POST['sub'])) {
$len = $_POST['len'];
$wid = $_POST['wid'];
$area = (($len*$wid)/2);
echo $area;
}
else{
echo "Not input detected.";
}