Joomla sending Data (special Image) with Ajax (Formdata) - ajax

Question

Using Joomla:
My problem is when I submit the button, ajax send an empty data array back to my client. Debbuging in the console shows me that datas in the header but the preview and response values are empty.
Here is my code (I am using a modal form from bootstrap).
HTML in my default script:
<form action="<?php echo JRoute::_('index.php?option=com_addproduct&view=addproducts'); ?>" method="post" name="modalMessageForm" id="modalMessageForm" enctype="multipart/form-data">
<input type="file" id="message-image-upload" accept="image/*" style="display:none;" name="message-image-upload">
<textarea class="form-control message-textarea" id="message-textarea" placeholder="Nachricht..." name="new-message" rows="4"></textarea>
<button type="button" id="button-close-message" class="btn btn-default btn-block btn-message-close" style="display:none; margin-top:5px;"><?=JText::_( 'COM_ADDPRODUCT_MODAL_MESSAGES_CLOSE')?></button>
</form>
JQuery / Ajax:
$(document).on("submit", "#modalMessageForm", function(e)
{
var form = $('#modalMessageForm').get(0);
e.preventDefault();
var formData = new FormData(form);
for(var pair of formData.entries()) {
console.log(pair[0]+ ', '+ pair[1]);
}
$.ajax({
crossDomain: true,
type: "POST",
url: "index.php?option=com_addproduct&task=sendMessages&format=json",
data: formData,
dataType: "json",
processData: false
})
.done(function(data, textStatus, jqXHR){
console.log('Message: '+data.new-message+' PicName: '+data.img);
})
});
Here my controller.php:
public function sendMessages()
{
JResponse::setHeader('Content-Type', 'application/json', true);
$app = JFactory::getApplication();
$input = $app->input;
$new-message = $input->getString('new-message', '', 'RAW');
$img = $_FILES['message-image-upload']["name"];
$img = JFile::makeSafe($img);
$results=array(
'new-message' => 'new-message',
'img' => $img
);
echo json_encode($results);
$app->close();
}
I got the datas / variables in the console log.
it is:
new-message: null,
img: null
trying to set contentType: false will give me an 500 error.
Thank you very much
That´s the info from my network
enter image description here

Answer 1

I figure something out.
It´s the URL in my ajax command.
When I am using a normal url like
url: 'upload.php'
that will work and then I can set the
contentType: false,
But this is not safety enought.
I just want to use this url
url: "index.php?option=com_addproduct&task=sendMessages&format=json",
But then I got the error message that the view is not found. That´s very strange.