Image Crop and Upload in Angular 12

Angular 12 image crop and upload with npm ngx-image-cropper example; In this tutorial, i am going to show you on how to show image preview by creating a Base64 url in angular before upload. And as well as how to crop an image in angular, how to zoom the image, and how to scale the image in Angular.

Crop image is great feature for server space optimization. Crop image will resize image as per required size while uploading on the server. Crop image will reduce image size and optimize image before uploading to the server. Crop image will upload image with our required width and height.

Angular 12 Image Upload, Preview, Crop, Zoom and Scale Tutorial

• Step 1 – Create New Angular App
• Step 2 – Install ngx-image-cropper and Bootstrap Library
• Step 3 – Import Modules on App.Module.ts File
• Step 4 – Add Code on View File
• Step 5 – Add Code On app.Component ts File
• Step 6 – Start the Angular App

Step 1 – Create New Angular App

First of all, open your terminal and execute the following command on it to install angular app:

ng new my-new-app

Step 2 – Install ngx-image-cropper and Bootstrap Library

Then install bootstrap library for implement image crop and upload in angular app. So, You can install the packages by executing the following commands on the terminal:

 npm install bootstrap

Include bootstrap css into angular.json file:

...
...
    "styles": [
        "src/styles.scss",
        "node_modules/bootstrap/dist/css/bootstrap.min.css"
    ],
...
...

Once you created a new angular app and entered into the project further, you have to install and add the image cropper plugin into the angular app:

npm install ngx-image-cropper

Step 3 – Import Modules on App.Module.ts File

Go to src/directory and open app.module.ts file. And then add the following lines of into app.module.ts file:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ImageCropperModule } from 'ngx-image-cropper';
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    ImageCropperModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 4 – Add Code on View File

Ceate image upload form in angular 12 app. So, go to src/ and app.component.html and update the following code into it:

<div class="container mt-5 text-center">
  <h3 class="mb-5">Angular Image Crop Example - Laratutorials.com</h3>
  <div class="col-md-12">
    <input type="file" (change)="onFileChange($event)" />
  </div>
  <div class="col-md-8">
    <image-cropper 
      [imageChangedEvent]="imgChangeEvt" 
      [maintainAspectRatio]="true" 
      [aspectRatio]="4 / 4"
      [resizeToWidth]="256" 
      format="png" 
      (imageCropped)="cropImg($event)" 
      (imageLoaded)="imgLoad()"
      (cropperReady)="initCropper()" 
      (loadImageFailed)="imgFailed()">
    </image-cropper>
  </div>
  <div class="col-md-4">
    <h6>Image Preview</h6>
    <img [src]="cropImgPreview" />
  </div>
</div>

Step 5 – Add Code On app.Component ts File

Go to src/ directory and open app.component.ts. Then add the following code into component.ts file:

import { Component } from '@angular/core';
import { ImageCroppedEvent } from 'ngx-image-cropper';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
    imgChangeEvt: any = '';
    cropImgPreview: any = '';
    onFileChange(event: any): void {
        this.imgChangeEvt = event;
    }
    cropImg(e: ImageCroppedEvent) {
        this.cropImgPreview = e.base64;
    }
    imgLoad() {
        // display cropper tool
    }
    initCropper() {
        // init cropper
    }
    
    imgFailed() {
        // error msg
    }
}

Step 6 – Start the Angular App

Execute the following command on terminal to start angular app:

ng serve

All features and methods of ngx-image-cropper

All inputs are optional. Either the imageChangedEvent, imageBase64 or imageFile should be set to load an image into the cropper.

Inputs

Name	Type	Default	Description
imageChangedEvent	FileEvent		The change event from your file input (set to null to reset the cropper)
imageFile	Blob(File)		The file you want to change (set to null to reset the cropper)
imageBase64	string		If you don’t want to use a file input, you can set a base64 image directly and it will be loaded into the cropper
imageURL	string		If you don’t want to use a file input or a base64 you can set an URL to get the image from. If requesting an image from a different domain make sure Cross-Origin Resource Sharing (CORS) is allowed or the image will fail to load.
format	string	png	Output format (png, jpeg, webp, bmp, ico) (not all browsers support all types, png is always supported, others are optional)
aspectRatio	number	1 / 1	The width / height ratio (e.g. 1 / 1 for a square, 4 / 3, 16 / 9 …)
maintainAspectRatio	boolean	true	Keep width and height of cropped image equal according to the aspectRatio
containWithinAspectRatio	boolean	false	When set to true, padding will be added around the image to make it fit to the aspect ratio
resizeToWidth	number	0 (disabled)	Cropped image will be resized to at most this width (in px)
resizeToHeight	number	0 (disabled)	Cropped image will be resized to at most this height (in px)
cropperStaticWidth	number	0 (disabled)	Set Cropper Width and disable resize (in px)
cropperStaticHeight	number	0 (disabled)	Set Cropper Height and disable resize (in px)
cropperMinWidth	number	0 (disabled)	The cropper cannot be made smaller than this number of pixels in width (relative to original image’s size) (in px)
cropperMinHeight	number	0 (disabled)	The cropper cannot be made smaller than this number of pixels in height (relative to original image’s size) (in px) (will be ignored if maintainAspectRatio is set)
cropperMaxWidth	number	0 (disabled)	The cropper cannot be made bigger than this number of pixels in width (in px)
cropperMaxHeight	number	0 (disabled)	The cropper cannot be made bigger than this number of pixels in height (in px)
initialStepSize	number	3 (px)	The initial step size in pixels when moving the cropper using the keyboard. Step size can then be changed by using the numpad when the cropper is focused
onlyScaleDown	boolean	false	When the resizeToWidth or resizeToHeight is set, enabling this option will make sure smaller images are not scaled up
cropper	CropperPosition		To be able to overwrite the cropper coordinates, you can use this input. Create a new object of type CropperPosition and assign it to this input. Make sure to create a new object each time you wish to overwrite the cropper’s position and wait for the cropperReady event to have fired.
roundCropper	boolean	false	Set this to true for a round cropper. Resulting image will still be square, use border-radius: 100% on resulting image to show it as round.
imageQuality	number	92	This only applies when using jpeg or webp as output format. Entering a number between 0 and 100 will determine the quality of the output image.
autoCrop	boolean	true	When set to true, the cropper will emit an image each time the position or size of the cropper is changed. When set to false, you can call the crop method yourself (use @ViewChild to get access to the croppers methods).
alignImage	‘left’ or ‘center’	‘center’	Use this to align the image in the cropper either to the left or center.
backgroundColor	string		Use this to set a backgroundColor, this is useful if you upload an image of a format with transparent colors and convert it to ‘jpeg’ or ‘bmp’. The transparent pixels will then become the set color or the default value. Enter any string representing a CSS color (https://developer.mozilla.org/en-US/docs/Web/CSS/color_value).
hideResizeSquares	boolean	false	Disables the resize-squares at the border of the cropper. This is mostly useful for Touch Devices where you can change the Size of the Cropper via Pinch-To-Zoom
disabled	boolean	false	Disables the component and prevents changing the cropper position
canvasRotation	number	0	Rotate the canvas (1 = 90deg, 2 = 180deg…)
transform	ImageTransform	{}	Flip, rotate and scale image

CSS Variables

Name	Type	Default	Description
--cropper-outline-color	string	rgba(255,255,255,0.3)	The background color you see around the cropper
--cropper-overlay-color	string	rgba(255,255,255)	The background color you see around the image

Outputs

Name	Type	Description
imageCropped	ImageCroppedEvent	Emits an ImageCroppedEvent each time the image is cropped
imageLoaded	LoadedImage	Emits the LoadedImage when it was loaded into the cropper
cropperReady	Dimensions	Emits when the cropper is ready to be interacted. The Dimensions object that is returned contains the displayed image size
startCropImage	void	Emits when the component started cropping the image
loadImageFailed	void	Emits when a wrong file type was selected (only png, gif and jpg are allowed)

Methods

To gain access to the image cropper’s methods use @ViewChild(ImageCropperComponent) imageCropper: ImageCropperComponent;

Name	Returns	Description
crop	ImageCroppedEvent	Crops the source image to the current cropper position. Be sure to set autoCrop to false if you only wish to use this function directly.

Interfaces

CropperPosition

Property	Type	Description
x1	number	X position of first coordinate (in px)
y1	number	Y position of first coordinate (in px)
x2	number	X position of second coordinate (in px)
y2	number	Y position of second coordinate (in px)

ImageTransform

Property	Type	Description
scale	number	Scale image (1=normal, 2=2x zoom…)
rotate	number	Rotation in degrees
flipH	boolean	Flipped horizontally
flipV	boolean	Flipped vertically

ImageCroppedEvent

Property	Type	Description
base64	string	Base64 string of the cropped image
width	number	Width of the cropped image
height	number	Height of the cropped image
cropperPosition	CropperPosition	Position of the cropper when it was cropped relative to the displayed image size
imagePosition	CropperPosition	Position of the cropper when it was cropped relative to the original image size
offsetImagePosition	CropperPosition	Position of the cropper when it was cropped relative to the original image size without padding when containWithinAspectRatio is true

LoadedImage

Property	Type	Description
original.base64	string	Base64 string of the original image
original.image	HTMLImageElement	HTMLImageElement of the original image
original.size	Dimension	Width and height of the original image
transformed.base64	string	Base64 string of the transformed image
transformed.image	HTMLImageElement	HTMLImageElement of the transformed image
transformed.size	Dimension	Width and height of the transformed image
exifTransform	ExifTransform	Exif transformations read from original image

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