XMLHttpRequest Email data not sent

Question

This is javascript:

function eAC(emailData) {
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
    }

    if (!httpRequest) {
        return false;
    }

    console.log(emailData);

    var fd = new FormData();
    fd.append("email", emailData);

    httpRequest.onreadystatechange = eAC_callback; 
    httpRequest.open('POST', "http://website.com/file.php");
    httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    httpRequest.send(fd);
}

function eAC_callback() {
    if (httpRequest.readyState === 4) {
        if (httpRequest.status === 200) {
            var response = JSON.parse(httpRequest.responseText);
                console.log(response);
        } else {
            return false;
        }
    }
};

This is php:

$pec_result = array();

if(isset($_POST['email']) && strlen($_POST['email']) > 0){
    $pec_result['error'] = 'Its good';
    echo json_encode($pec_result);
    die();
} else {
    $pec_result['error'] = $_POST['email'];
    echo json_encode($pec_result);
    die();
}

The problem here is what $_POST['email']matters NULL. Why $ _POST ['email'] is null when console.log () for emailDatareturns a value. Can anyone help? I think the problem is in the incremental part. (Not sure)

Please do not jQuery . I know how to do this in jQuery, but I want to learn how to do it in javascript. So thanks

Answer 1

, FormData multipart/form-data not application/x-www-form-urlencoded. , . , FormData XMLHttpRequest.send.

Answer 2

(EDITED)

fd='email='+emailData;

:

function eAC(emailData) {
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
    }

    if (!httpRequest) {
        return false;
    }

    console.log(emailData);

//    var fd = new FormData();
//    fd.append("email", emailData);
      fd='email='+emailData;

    httpRequest.onreadystatechange = eAC_callback; 
    httpRequest.open('POST', "http://website.com/file.php");
    httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    httpRequest.send(fd);
}

function eAC_callback() {
    if (httpRequest.readyState === 4) {
        if (httpRequest.status === 200) {
            var response = JSON.parse(httpRequest.responseText);
                console.log(response);
        } else {
            return false;
        }
    }
};