Angular File Upload Module

Introduction

An angular module for file uploads. Works great with images. INSTANTLY GET IMAGE PREVIEW BEFORE UPLOAD (ON FILE SELECT)

Currently Tested on Angular 4+

https://angular-w4tx91.stackblitz.io

How To Use

Installation:

npm i angular-upload-files

Usage:

Quick Example

example.component.ts:

import { Component, OnInit} from '@angular/core';
import { UploadService, UploadParams } from 'angular-upload-files';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example].component.css']
})
export class ExampleComponent implements OnInit {

  uploadParams : UploadParams;
  progress: string;
  fileCount: number;
  files: any[];

  constructor(private uploadService : UploadService) {}

  ngOnInit() {
    this.uploadParams = {
      formDataPropertyName: 'image', 
      extraParams: [{
        paramValueIsFromFile: true,
        paramValue: "name",
        paramName: "filename"
      }]
    }
    this.uploadService.currentUploadProgress.subscribe(
      (progress)=>{
        console.log(progress);
        this.progress = progress;
      }
    )
  }
  readFiles(event) {
    console.log(event, event.files, event.base64s); //read files from here, and if using images base64s also
    this.fileCount = event.files.length;

    // you can manipulate the files here, or just store them
    this.files = event.files;
  }
  uploadDone(event) {
    console.log(event);
    this.fileCount--;

    if(this.fileCount === 0) {
      //files are COMPLETELY done uploading
    }
  }
}

example.component.html

<app-uploader
(onFilesSelected)="readFiles($event)"
(onUploadComplete)="uploadDone($event)"
[buttonText]="'Choose Image'"
[buttonClass]="'btn btn-default'"
[postUrl]="'https://api.imgur.com/3/image'"
[id]="0"
[multiple]="true"
[usingImages]="true"
[showImagesOnAdd]="true"
[imageWidth]="'180px'"
[imagesRemovable]="true"
[imageRemoveType]="'clickOnX'"
[uploadParams]="uploadParams"
[imageContainerDisplay]="'inline-block'"
></app-uploader>

<p>{{progress}}% uploaded</p>

App Module Setup:

import {UploaderModule} from 'angular-upload-files'; 

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    FormsModule,
    UploaderModule.forRoot(), // <---------------
    HttpClientModule,
    RouterModule.forRoot(Routes) 
  ],
  providers: [
  ],
  bootstrap: [AppComponent],
}) 

In your component:

import { UploadService, UploadParams } from 'angular-upload-files';

constructor(private uploadService : UploadService) { }

Interfaces:

export interface UploadParams {
  formDataPropertyName: string;
  extraParams : ExtraParams[];
}
export interface ExtraParams {
  paramValueIsFromFile: boolean;
  paramName: string;
  paramValue: any;
}

You must input a UploadParams object into each instance of the uploader: formDataPropertyName: string; The uploader will automatically append a FormData object with the file and file name attached, as well as the formDataPropertyName (this is how it looks internally):

formData.append(this.uploadParams.formDataPropertyName, file, file.name);

Extra Params:

Extra Params is for passing query string parameters to your request:

example:

    this.uploadParams = {formDataPropertyName: 'image', extraParams: {
      paramValueIsFromFile: true, //paramValue will be accessed as file[paramValue] set false for value to be just paramValue
      paramValue: "name",
      paramName: "filename"
    }}

    this.uploadParams = {formDataPropertyName: 'image', extraParams: {
      paramValueIsFromFile: false, //paramValue will be accessed as paramValue (params.set(paramName, paramValue))
      paramValue: "name",
      paramName: "filename"
    }}

Inputs:

Input	Description
uploadParams: UploadParams	See UploadParams description above.
buttonText: string	Set upload button text.
buttonClass: string	Set class value. like: "btn btn-primary"
id: number	Set uploader id
postUrl: string	Uploader target url
usingImages: boolean	Set to true if images (and only images) are being uploaded.
showImagesOnAdd: boolean	If usingImages is set to true, images will show in the DOM on add
imageWidth: string	CSS width value. like: "180px"
imagesRemovable: boolean	Images can be removed.
imageRemoveType: string	'clickOnImage' OR 'clickOnX'
imageContainerDisplay: string	CSS display property for image container: eg. 'inline', 'inline-block'

Events:

Event	Description
(onFilesSelected)	event containing {files: files} OR {files: files, base64s: base64ImgUrls} based on 'usingImages'
(onUploadComplete)	Event fired on each upload completion containing {response: event, file: file}
(onImageRemoved)	Event fired when when you remove an image (usingIMages mode)

Triggering events from your component:

Event	Description
Start Upload	this.uploadService.startUpload.next(files)
Remove Image	this.uploadService.removeImage.next(index: file/image index})
Clear Images	this.uploadService.clearImages.next({})

Triggering events from your component: (MULTIPLE UPLOADERS)

Event	Description
Start Upload	this.uploadService.startUpload.next(files)
Remove Image	this.uploadService.removeImage.next({id: componentId, index: file/image index})
Clear Images	``` this.uploadService.clearImages.next({id: componentId})

NOTE: You may omit the componentId but all uploaders will receive the sent event if you do so.

Upload Progress:

this.uploadService.currentUploadProgress.subscribe(
    (progress)=>{
        console.log(progress);
    }
)

DEMO

https://angular-w4tx91.stackblitz.io