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File input form events final (article embed)
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| import {Component, ElementRef, ViewChild} from '@angular/core'; | |
| import {HttpClient} from '@angular/common/http'; | |
| import {environment} from '../environments/environment'; | |
| @Component({ | |
| selector: 'app-root', | |
| templateUrl: './app.component.html', | |
| styleUrls: ['./app.component.css'] | |
| }) | |
| export class AppComponent { | |
| acceptedMimeTypes = [ | |
| 'image/gif', | |
| 'image/jpeg', | |
| 'image/png' | |
| ]; | |
| @ViewChild('fileInput') fileInput: ElementRef; | |
| fileDataUri = ''; | |
| errorMsg = ''; | |
| constructor(private http: HttpClient) {} | |
| previewFile() { | |
| const file = this.fileInput.nativeElement.files[0]; | |
| if (file && this.validateFile(file)) { | |
| const reader = new FileReader(); | |
| reader.readAsDataURL(this.fileInput.nativeElement.files[0]); | |
| reader.onload = () => { | |
| this.fileDataUri = reader.result; | |
| } | |
| } else { | |
| this.errorMsg = 'File must be jpg, png, or gif and cannot be exceed 500 KB in size' | |
| } | |
| } | |
| uploadFile(event: Event) { | |
| event.preventDefault(); | |
| // get only the base64 file and post it | |
| if (this.fileDataUri.length > 0) { | |
| const base64File = this.fileDataUri.split(',')[1]; | |
| const data = {'image': base64File}; | |
| this.http.post(`${environment.apiUrl}/upload-photo`, data) | |
| .subscribe( | |
| res => { | |
| // handle success | |
| // reset file input | |
| this.fileInput.nativeElement.value = ''; | |
| }, | |
| err => { | |
| this.errorMsg = 'Could not upload image.'; | |
| } | |
| ); | |
| } | |
| } | |
| validateFile(file) { | |
| return this.acceptedMimeTypes.includes(file.type) && file.size < 500000; | |
| } | |
| } |
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