Reusable upload component in Laravel with Dropzone.js - visit http://wp.me/p8cmxL-9Q for tutorial

0_uploader.blade.php

@php $dropzoneId = isset($dz_id) ? $dz_id : str_random(8); @endphp
<div id="{{$dropzoneId}}" class="dropzone">
    <div class="dz-default dz-message">
        <h3>{{ $title or  'Drop files here or click to upload.'}}</h3>
        <p class="text-muted">{{ $desc or 'Any related files you can upload' }} <br>
            <small>One file can be max {{ config('attachment.max_size', 0) / 1000 }} MB</small></p>
    </div>
</div>
<!-- Dropzone {{ $dropzoneId }} -->

@push('scripts')
<script>
    // Turn off auto discovery
    Dropzone.autoDiscover = false;

    $(function () {
        // Attach dropzone on element
        $("#{{ $dropzoneId }}").dropzone({
            url: "{{ route('attachments.store') }}",
            addRemoveLinks: true,
            maxFilesize: {{ isset($maxFileSize) ? $maxFileSize : config('attachment.max_size', 1000) / 1000 }},
            acceptedFiles: "{!! isset($acceptedFiles) ? $acceptedFiles : config('attachment.allowed') !!}",
            headers: {'X-CSRF-TOKEN': "{{ csrf_token() }}"},
            params: {!! isset($params) ? json_encode($params) : '{}'  !!},
            init: function () {
                // uploaded files
                var uploadedFiles = [];

                @if(isset($uploadedFiles) && count($uploadedFiles))

                // show already uploaded files
                uploadedFiles = {!! json_encode($uploadedFiles) !!};
                var self = this;

                uploadedFiles.forEach(function (file) {
                    // Create a mock uploaded file:
                    var uploadedFile = {
                        name: file.filename,
                        size: file.size,
                        type: file.mime,
                        dataURL: file.url
                    };

                    // Call the default addedfile event
                    self.emit("addedfile", uploadedFile);

                    // Image? lets make thumbnail
                    if( file.mime.indexOf('image') !== -1) {

                        self.createThumbnailFromUrl(
                            uploadedFile,
                            self.options.thumbnailWidth,
                            self.options.thumbnailHeight,
                            self.options.thumbnailMethod,
                            true, function(thumbnail) {
                                self.emit('thumbnail', uploadedFile, thumbnail);
                        });

                    } else {
                        // we can get the icon for file type
                        self.emit("thumbnail", uploadedFile, getIconFromFilename(uploadedFile));
                    }

                    // fire complete event to get rid of progress bar etc
                    self.emit("complete", uploadedFile);
                })

                @endif

                // Handle added file
                this.on('addedfile', function(file) {
                    var thumb = getIconFromFilename(file);
                    $(file.previewElement).find(".dz-image img").attr("src", thumb);
                })

                // handle remove file to delete on server
                this.on("removedfile", function (file) {
                    // try to find in uploadedFiles
                    var found = uploadedFiles.find(function (item) {
                        // check if filename and size matched
                        return (item.filename === file.name) && (item.size === file.size);
                    })

                    // If got the file lets make a delete request by id
                    if( found ) {
                        $.ajax({
                            url: "/attachments/" + found.id,
                            type: 'DELETE',
                            headers: {
                                'X-CSRF-TOKEN': "{{ csrf_token() }}"
                            },
                            success: function(response) {
                                console.log('deleted');
                            }
                        });
                    }
                });

                // Handle errors
                this.on('error', function(file, response) {
                    var errMsg = response;

                    if( response.message ) errMsg = response.message;
                    if( response.file ) errMsg = response.file[0];

                    $(file.previewElement).find('.dz-error-message').text(errMsg);
                });
            }
        });
    })

// Get Icon for file type
function getIconFromFilename(file) {
    // get the extension
    var ext = file.name.split('.').pop().toLowerCase();

    // if its not an image
    if( file.type.indexOf('image') === -1 ) {

        // handle the alias for extensions
        if(ext === 'docx') {
            ext = 'doc'
        } else if (ext === 'xlsx') {
            ext = 'xls'
        }

        return "/images/icon/"+ext+".svg";
    }

    // return a placeholder for other files
    return '/images/icon/txt.svg';
}
</script>
@endpush

Attachment.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;

class Attachment extends Model
{
    protected $guarded = [];

    protected $appends = ['url'];

    public function attachable()
    {
        return $this->morphTo();
    }

    public function getUrlAttribute()
    {
        return Storage::url($this->uid);
    }

    public static function boot()
    {
        parent::boot();

        static::deleting(function($attachment) {
            // delete associated file from storage
            Storage::disk('public')->delete($attachment->uid);
        });
    }
}

attachment.php

<?php

return [
    // Allowed file types with . prefix
    'allowed' => '.pdf,.doc,.xls,.docx,.xlsx,.jpg,.png,.gif,.jpeg',

    // Max file size in KB
    'max_size' => 5000
];

AttachmentController.php

<?php

namespace App\Http\Controllers;

use App\Attachment;
use Illuminate\Http\Request;

class AttachmentController extends Controller
{
    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $request->validate([
        'file' => 'required|file|max:5000|mimes:' . $this->getAllowedFileTypes(),
        'attachable_id' => 'required|integer',
        'attachable_type' => 'required',
        ]);

        // save the file
        if ($fileUid = $request->file->store('/upload', 'public')) {
            return Attachment::create([
                'filename' => $request->file->getClientOriginalName(),
                'uid' => $fileUid,
                'size' => $request->file->getClientSize(),
                'mime' => $request->file->getMimeType(),
                'attachable_id' => $request->get('attachable_id'),
                'attachable_type' => $request->get('attachable_type'),
            ]);
        }

        return response(['msg' => 'Unable to upload your file.'], 400);
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Attachment  $attachment
     * @return \Illuminate\Http\Response
     */
    public function destroy(Attachment $attachment)
    {
        return (string) $attachment->delete();
    }

    /**
     * Remove . prefix so laravel validator can use allowed files
     *
     * @return string
     */
    private function getAllowedFileTypes()
    {
        return str_replace('.', '', config('attachment.allowed', ''));
    }
}

attachments_table_migration.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateAttachmentsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('attachments', function (Blueprint $table) {
            $table->increments('id');
            $table->string('filename');
            $table->string('uid');
            $table->integer('size');
            $table->string('mime', 100);
            $table->morphs('attachable');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('attachments');
    }
}

dropzone.scss

/*
 * The MIT License
 * Copyright (c) 2012 Matias Meno <m@tias.me>
 */

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

@mixin keyframes($name) {
  @-webkit-keyframes #{$name} {
    @content; 
  }
  @-moz-keyframes #{$name} {
    @content;
  }
  @keyframes #{$name} {
    @content;
  } 
}


@mixin prefix($map, $vendors: webkit moz ms o) {
  @each $prop, $value in $map {
    @if $vendors {
      @each $vendor in $vendors {
        #{"-" + $vendor + "-" + $prop}: #{$value};
      }
    }
    // Dump regular property anyway
    #{$prop}: #{$value};
  }
}


@include keyframes(passing-through) {
  
  0% {
    opacity: 0;
    @include prefix((transform: translateY(40px)));
  }

  30%, 70% {
    opacity: 1;
    @include prefix((transform: translateY(0px)));
  }

  100% {
    opacity: 0;
    @include prefix((transform: translateY(-40px)));
  }
}


@include keyframes(slide-in) {
  
  0% {
    opacity: 0;
    @include prefix((transform: translateY(40px)));
  }

  30% {
    opacity: 1;
    @include prefix((transform: translateY(0px)));
  }
}



@include keyframes(pulse) {
  
  0% { @include prefix((transform: scale(1))); }
  10% { @include prefix((transform: scale(1.1))); }
  20% { @include prefix((transform: scale(1))); }

}



.dropzone, .dropzone * {
  box-sizing: border-box;
}
.dropzone {

  $image-size: 120px;

  $image-border-radius: 10px;

  &.dz-clickable {
    cursor: pointer;

    * {
      cursor: default;
    }
    .dz-message {
      &, * {
        cursor: pointer;
      }
    }
  }

  min-height: 250px;
  border: 1px dashed rgba($brand-primary, 0.6);
  background: white;
  padding: 20px 20px;
  border-radius: $image-border-radius;

  &.dz-started {
    .dz-message {
      display: none;
    }
  }

  &.dz-drag-hover {
    border-color: $brand-primary;

    .dz-message {
      opacity: 0.5;
      transform: scale(1.2);
    }
  }

  .dz-message {
    text-align: center;
    margin-top: 5em;
    transform: scale(1);
    transition: all ease 0.3s;

    h3 {
      font-weight: bold;
    }
  }



  .dz-preview {
    position: relative;
    display: inline-block;

    vertical-align: top;

    margin: 16px;
    min-height: 100px;

    &:hover {
      // Making sure that always the hovered preview element is on top
      z-index: 1000;
      .dz-details {
        opacity: 1;
      }
    }

    &.dz-file-preview {

      .dz-image {
        border-radius: $image-border-radius;
        background: #999;
        background: linear-gradient(to bottom, #eee, #ddd);
      }

      .dz-details {
        opacity: 1;
      }
    }

    &.dz-image-preview {
      background: white;
      .dz-details {
        @include prefix((transition: opacity 0.2s linear));
      }
    }

    .dz-remove {
      font-size: 14px;
      text-align: center;
      display: block;
      cursor: pointer;
      border: none;
      &:hover {
        text-decoration: underline;
      }
    }

    &:hover .dz-details {
      opacity: 1;
    }
    .dz-details {
      $background-color: #444;

      z-index: 20;

      position: absolute;
      top: 0;
      left: 0;

      opacity: 0;

      font-size: 13px;
      min-width: 100%;
      max-width: 100%;
      padding: 2em 1em;
      text-align: center;
      color: rgba(0, 0, 0, 0.9);

      $width: 120px;

      line-height: 150%;

      .dz-size {
        margin-bottom: 1em;
        font-size: 16px;
      }

      .dz-filename {

        white-space: nowrap;

        &:hover {
          span {
            border: 1px solid rgba(200, 200, 200, 0.8);
            background-color: rgba(255, 255, 255, 0.8);
          }
        }
        &:not(:hover) {
          span {
            border: 1px solid transparent;
          }
          overflow: hidden;
          text-overflow: ellipsis;
        }

      }

      .dz-filename, .dz-size {
        span {
          background-color: rgba(255, 255, 255, 0.4);
          padding: 0 0.4em;
          border-radius: 3px;
        }
      }

    }

    &:hover {
      .dz-image {
        // opacity: 0.8;
        img {
          @include prefix((transform: scale(1.05, 1.05))); // Getting rid of that white bleed-in
          @include prefix((filter: blur(8px)), webkit); // Getting rid of that white bleed-in
        }
      }
    }
    .dz-image {
      border-radius: $image-border-radius;
      overflow: hidden;
      width: $image-size;
      height: $image-size;
      position: relative;
      display: block;
      z-index: 10;

      img {
        display: block;
      }
    }


    &.dz-success {
      .dz-success-mark {
        @include prefix((animation: passing-through 3s cubic-bezier(0.770, 0.000, 0.175, 1.000)));
        svg path {
          fill: $brand-success;
        }
      }
    }
    &.dz-error {
      .dz-error-mark {
        opacity: 1;
        @include prefix((animation: slide-in 3s cubic-bezier(0.770, 0.000, 0.175, 1.000)));

        svg g {
          fill: $brand-danger;
        }
      }
    }


    .dz-success-mark, .dz-error-mark {

      $image-height: 54px;
      $image-width: 54px;

      pointer-events: none;

      opacity: 0;
      z-index: 500;

      position: absolute;
      display: block;
      top: 50%;
      left: 50%;
      margin-left: -($image-width/2);
      margin-top: -($image-height/2);

      svg {
        display: block;
        width: $image-width;
        height: $image-height;
      }
    }
      
    &.dz-processing .dz-progress {
      opacity: 1;
      @include prefix((transition: all 0.2s linear));
    }
    &.dz-complete .dz-progress {
      opacity: 0;
      @include prefix((transition: opacity 0.4s ease-in));
    }

    &:not(.dz-processing) {
      .dz-progress {
        @include prefix((animation: pulse 6s ease infinite));
      }
    }
    .dz-progress {

      opacity: 1;
      z-index: 1000;

      pointer-events: none;
      position: absolute;
      height: 16px;
      left: 50%;
      top: 50%;
      margin-top: -8px;

      width: 80px;
      margin-left: -40px;

      // border: 2px solid #333;
      background: rgba(255, 255, 255, 0.9);

      // Fix for chrome bug: https://code.google.com/p/chromium/issues/detail?id=157218
      -webkit-transform: scale(1);


      border-radius: 8px;

      overflow: hidden;

      .dz-upload {
        background: #333;
        background: linear-gradient(to bottom, #666, #444);
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        width: 0;
        @include prefix((transition: width 300ms ease-in-out));
      }

    }

    &.dz-error {
      .dz-error-message {
        display: block;
      }
      &:hover .dz-error-message {
        opacity: 1;
        pointer-events: auto;
      }
    }

    .dz-error-message {
      $width: $image-size + 20px;
      $color: rgb(190, 38, 38);

      pointer-events: none;
      z-index: 1000;
      position: absolute;
      display: block;
      display: none;
      opacity: 0;
      @include prefix((transition: opacity 0.3s ease));
      border-radius: 8px;
      font-size: 13px;
      top: $image-size + 26px;
      left: -10px;
      width: $width;
      background: $color;
      background: linear-gradient(to bottom, $color, darken($color, 5%));
      padding: 0.5em 1.2em;
      color: white;

      // The triangle pointing up
      &:after {
        content: '';
        position: absolute;
        top: -6px;
        left: $width / 2 - 6px;
        width: 0; 
        height: 0; 
        border-left: 6px solid transparent;
        border-right: 6px solid transparent;
        border-bottom: 6px solid $color;
      }
    }

  }
}

home.blade.php

@extends('layouts.app')

@section('content')
<div class="container">
            <div class="panel panel-default">
                <div class="panel-heading">Dashboard</div>

                <div class="panel-body">
                    @if (session('status'))
                        <div class="alert alert-success">
                            {{ session('status') }}
                        </div>
                    @endif

                    @component('partials.uploader', [
                        'title' => 'Upload Post Images',
                        'params' => [
                            'attachable_id' => 1,
                            'attachable_type' => 'App\Post'
                        ],
                        'acceptedFiles' => '.jpg,.png',
                        'uploadedFiles' => $post->attachments->toArray()
                    ])
                    @endcomponent
<br>
                    @component('partials.uploader', [
                        'title' => 'Document Uploader',
                        'desc' => 'Upload PDF, DOC, or XLS document',
                        'params' => [
                            'attachable_id' => 2,
                            'attachable_type' => 'App\Post'
                        ],
                        'acceptedFiles' => '.doc,.xls,.pdf, .docx',
                        'uploadedFiles' => $post2->attachments->toArray()
                    ])
                    @endcomponent
                </div>
            </div>
        </div>
@endsection