Ajax File

Ajax file uploads on Rails

How to upload files with Ajax using Ruby on Rails?

Today we will see how to files upload using Ajax without a page load.

We will use DropzoneJS, DropzoneJS is an open source library that provides drag ‘n’ drop file uploads with image previews.

At first, we need to install DropzoneJS gem on our rails environment, let’s try:

#=> Gemfile
gem 'dropzonejs-rails'

Then install via

$ bundle install

Then link to the pipeline

#=> app/assets/javascripts/application.js
//= require dropzone
#=> app/assets/stylshits/application.css
*= require dropzone/dropzone

And then migrate a model

$ rails generate model Photo avatar:string
$ rake db:migrate

Now we need install file uploader gem which isĀ Carrierwave

#=> Gemfile
gem 'carrierwave'

Now generating uploader

$ rails generate uploader Avatar

#=> app/models/photo.rb
mount_uploader :avatar, AvatarUploader

Now create controller & view

$ rails g controller photos index

Configure routes

#=> config/routes.rb
resources :photos
#=> app/view/photos/index.html.erb
<%= form_tag photos_path, method: :post, class: "dropzone", id: "media-dropzone" do %>
   <%= file_field_tag :avatar, multiple: true%>
<% end %>
$(function() {
    var photoDropzone = new Dropzone("#media-dropzone");
    return photoDropzone.on("success", function(file, responseText) {
        var  = responseText.avatar.url;
#=> app/controllers/photos_controller.rb
def create
    @avatar = Photo.new(avatar: params[:file])
    if @avatar.save
  respond_to do |format|
      format.json{render json: @avatar}

That’s it, now try to upload & look like below image

Happy coding!