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Dropzone Success function not working

I am trying to implement Bootstrap Dropzone on a website but I am facing a problem getting the success message. Below is my code.
var mydropzone = new Dropzone("#dropzonejs-example", {
url: "/Home/FilesUpload/",
autoProcessQueue: false,
uploadMultiple: true,
parallelUploads: 10,
addRemoveLinks: true,
init: function() {
this.on("sending", function(file, xhr, formData) {
formData.append("is_visible", $('#is_visible').is(':checked'));
this.removeFile(file);
this.on("success", function(fname) {
console.log("ok");
});
});
},
});
$("#uploadbtn").click(function() {
mydropzone.processQueue();
});
My controller returns a string so I want to catch the string here. How can it be possible or where am I doing the mistake? Please correct my code.

Sorting Dropzone.js

I'm using Dropzone.js with Spring boot.
Everything works fine except, when I upload image it goes on the bottom of gallery.
How can I make it so that the image which is uploaded shows first (on the top of gallery). Does Dropzone have some built in methods that I could use?
var extraImageDropzone = new Dropzone('#extraImagesDropzone', {
url: "/uploads/upload",
maxFiles: 25,
acceptedFiles: 'image/*',
autoQueue: true,
addRemoveLinks: false,
parallelUploads: 1,
createImageThumbnails: false,
createImageData:false,
previewsContainer: null,
previewTemplate: '<li style="diplay:none"></li>',
hiddenInputContainer: "#extraImagesDropzoneToggle",
clickable: "#extraImagesDropzoneToggle",
// thumbnailWidth: 100,
thumbnailHeight: 100,
thumbnailMethod: `contain`,
complete: function(file, response) {
console.log('completed');
},
success: function(f, response) {
if (response.id) {
console.log('File uploaded' + response.URL);
$(".image-picker").data('picker').append_one(response.id, response.URL);
} else {
alert('Error while uploading');
this.removeFile(f);
}
}
});

Added prepend_one method to Image-picker lib and now works fine.
ImagePicker.prototype.prepend_one = function (val, image_src) {
var option = jQuery('<option>').val(val).attr('data-img-src', image_src);
this.select.prepend(option);
var picker_option = new ImagePickerOption(option[0], this, this.opts);
this.picker_options.push(picker_option);
this.picker.prepend(picker_option.node);
};

DropzoneJS: Prevent uploading and displaying unsupported files

For my project I'm using the Drag & Drop library DropzoneJS. It's working nicely, but I want to have a specific functionality that (for as far as I can see) is not supported 'out of the box'.
In my Dropzone config I've specified the acceptedFiles:
acceptedFiles: ".png,.jpg,.jpeg,.gif,.pdf"
When I use the browse button it automatically checks if the file is supported or not. But when I drag & drop files, the check is done AFTER the upload has already been done, and displays the file with an error message.
What I'd like to achieve is that the drag & drop first checks if the files are supported, and automatically discard the unsupported file. I'd still like to display an error message which states that some of the files are not supported.
For reference, here is my complete Dropzone config:
import Dropzone from 'dropzone';
export default class UI_DropZone {
constructor() {
if (document.querySelector('#dropZone')) {
let previewNode = document.querySelector("#template");
previewNode.id = "";
let previewTemplate = previewNode.parentNode.innerHTML;
previewNode.parentNode.removeChild(previewNode);
return new Dropzone("#dropZone", {
url: "/dist/files",
thumbnailWidth: 300,
thumbnailHeight: 300,
parallelUploads: 20,
maxFilesize: 10,
acceptedFiles: ".png,.jpg,.jpeg,.gif,.pdf",
previewTemplate: previewTemplate,
previewsContainer: '#previews',
clickable: '.fileinput-button',
autoProcessQueue: false
});
}
}
}

You can catch errors and remove the file with some sort of notification if it is a problem:
init: function() {
this.on("error", function(file, message, xhr) {
if (xhr == null) this.removeFile(file); // perhaps not remove on xhr errors
alert(message);
});
}
So with your config this will look like:
return new Dropzone("#dropZone", {
url: "/dist/files",
thumbnailWidth: 300,
thumbnailHeight: 300,
parallelUploads: 20,
maxFilesize: 10,
acceptedFiles: ".png,.jpg,.jpeg,.gif,.pdf",
previewTemplate: previewTemplate,
previewsContainer: '#previews',
clickable: '.fileinput-button',
autoProcessQueue: false,
"error": function(file, message, xhr) {
if (xhr == null) this.removeFile(file); // perhaps not remove on xhr errors
alert(message);
}
});
Example: https://jsfiddle.net/m4ye8gL2/1

myDropzone.on("error", function(file, message, xhr) {
if(xhr == null) myDropzone.removeFile(file);
alert(message)
});

Dropzone.js getting image for Preview

I'm trying to get the real image that is queued in the Dropzone and show a preview, but the only image i can get is the one of the thumbnail, is there a way to get the real image?
here is my code:
var uploadDrop = new Dropzone("#my-awesome-dropzone", {
acceptedFiles: "image/png",
url: "${g.createLink(controller:'perfil',action: 'saveFile')}",
maxFiles: 1, // Number of files at a time
maxFilesize: 1, //in MB
autoProcessQueue: false,
maxfilesexceeded: function(file){
alert('You have uploaded more than 1 Image. Only the first file will be uploaded!');
},
init: function(){
this.on("addedfile", function() {
if (this.files[1]!=null){
this.removeFile(this.files[0]);
}
});
},
thumbnail: function(file, dataUrl) {
// Display the image in your file.previewElement
$(file.previewElement).removeClass("dz-file-preview").addClass("dz-image-preview");
$(file.previewElement).find(".dz-image img").attr("src",dataUrl);
$("#preview").attr("src",dataUrl);
},
success: function (response) {
var x = JSON.parse(response.xhr.responseText);
var message=x.data.message;
if (message.pass) {
originalLogoName=x.data.data.logoName
pasoPorSubida=true;
simpleMessage(message.title, message.body, "success");
this.removeAllFiles(); // This removes all files after upload to reset dropzone for next upload
} else {
simpleMessage(message.title, message.body, "error");
}
},
addRemoveLinks: true,
removedfile: function(file) {
var _ref; // Remove file on clicking the 'Remove file' button
if(!success){
$("#preview").attr("src",originalLogoUrl+"/"+originalLogoName);
}else{
success=false;
}
return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;
}
});

Dropzone not validating maximum number of files

I am using dropzone for uploading files , I have set the file limitations upto maximum six files, this code is working if I upload one image at a time, but if I select more then six images by pressing control button at the start of uploading files then it does not validate the files and uploads all files. I am using laravel for backend, My code is:-
Dropzone.options.myAwesomeDropzone = {
paramName: "file", // The name that will be used to transfer the file
maxFilesize: 1, // MB
maxFiles: 6,
acceptedFiles: ".jpeg,.jpg,.png,.gif",
clickable: true,
init: function () {
this.on("success", function(file, responseText) {
file.previewTemplate.setAttribute('id',responseText[0].id);
});
this.on("thumbnail", function(file) {
if (file.width < 350 || file.height < 200) {
file.rejectDimensions()
}
else {
file.acceptDimensions();
}
});
},
accept: function(file, done) {
file.acceptDimensions = done;
file.rejectDimensions = function() { done("Image width or height should be greater than 350*200"); };
},
removedfile: function(file){
var name = file.name;
$.ajax({
type: 'POST',
url: ajax_url+'listing/deleteListingImage/'+name,
dataType: 'html'
});
var _ref;
return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;
},
dictDefaultMessage: "Drop your files to upload"
}
Thanks

You can remove the extra files using the method removeFile(file) when maxfilesexceeded is called.
Like this:
Dropzone.options.myAwesomeDropzone = {
maxFiles: 2,
autoProcessQueue: false,
init: function(){
var myDropZone = this;
myDropZone.on('maxfilesexceeded', function(file) {
myDropZone.removeFile(file);
});
}
}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/dropzone.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/min/dropzone.min.js"></script>
<form action="/file-upload"
class="dropzone"
id="my-awesome-dropzone">
</form>
http://output.jsbin.com/dodajij