Runny Yolk Runny Yolk - 9 months ago 39
Ajax Question

Submitting Form via JQuery Ajax Post Request

I have a basic messaging service on a web Node / Express web app, and I'm trying to submit the form via Ajax, using the FormData object.

If I submit the form without AJAX, then everything works fine, but with AJAX the req.body. are all undefined.

On the server, I need to look for the data somewhere other than req.body when using AJAX??

Creating the FormData object:

var ajaxData = new FormData;
ajaxData.append('newMessage', $('.new-message').val()) // I've console.logged these, and their values are correct
ajaxData.append('senderId', $('[name="senderId"]').val())
ajaxData.append('senderName', $('[name="senderName"]').val())// I've console.logged these, and their values are correct
ajaxData.append('recipientId', $('[name="recipientId"]').val())
ajaxData.append('recipientName', $('[name="recipientName"]').val())// I've console.logged these, and their values are correct

And this is the POST request:

url: $form.attr('action'),
type: $form.attr('method'),
data: ajaxData,
dataType: false,
cache: false,
contentType: false,
processData: false,
complete: function() {
console.log('message created');
success: function(data) {

error: function(xhr, textStatus, errorThrown) {


Thanks to G. Mansour for his answers below. In case anyone else gets here, the issue was the line:

contentType: false,

I tried this line at some point, which also doesn't work

contentType: 'application/json',

But when I remove the line entirely, everything is working as normal... If anyone can tell me why this line was breaking everything, I'd be interested to know.


This is the html part

<form id="form" action="" method="post">
<input type="text" name="msgID" id="msgID">
<input type="text" name="senderId" id="senderId">
<input type="text" name="senderName" id="senderName">
<input type="text" name="recipientId" id="recipientId">
<input type="text" name="recipientName" id="recipientName">
<input type="submit" name="dsq" value="dsqdsq">

this is the JavaScript part

<script type="text/javascript">

        url: "test.php", 
        data: $("#form").serialize(), 
        type: "POST", 
        dataType: 'json',
        success: function (e) {


    return false;


And this is the php code


Hope that will helps you.