本模块的主要目标是在 Firebase 存储中上传用户的个人资料图片,并将照片 URL 存储在 Firestore (Cloud Firestore) 中。
注意:
- 我上传的图片只有 JPG 和 PNG 格式。
- 这是包含 Ionic 和 Angular 的跨平台应用程序
我尝试以下场景:
- 我直接将图片推送到 Firestore 中,而不将其上传到 Firebase Cloud Storage,因此图片名称会转换为长字符“data:image,base64”> 其中,我不知道这种情况在我的数据库或系统中是否可行,因为它运行完美,并且图像是可检索的。我希望您能在这种情况下帮助我。
更新的错误:
这是用户的字段:
update-profile.component.ts
userId: string;
fname: string;
studentId: string;
@ViewChild('filePicker') filePickerRef: ElementRef<HTMLInputElement>;
@Input() showPreview = true;
//The Selected Image in the File Explorer
selectedImage: any;
constructor(private auth: AuthService,
private afs: AngularFirestore,
private loadingCtrl: LoadingController,
private toaster: ToastController,
private storage: AngularFireStorage,
private popOverCtrl: PopoverController) { }
ngOnInit() {
this.profileEditSub = this.auth.user$.subscribe(user => {
this.userId = user.userId;
this.fname = user.userName;
this.studentId = user.userSchoolId;
this.selectedImage = user.userPhoto;
});
}
onSubmit(form: NgForm){
const user = form.value.fname;
const studentId = form.value.studentId;
this.onUpdateUser(user, studentId);
}//
async onUpdateUser(name: string, studentNo: string){
const loading = await this.loadingCtrl.create({
message: 'Updating...',
spinner: 'crescent',
showBackdrop: true
});
loading.present();
const imageUrl = await this.uploadFile(this.userId, this.selectedImage);
this.afs.collection('user').doc(this.userId).update({
'userName': name,
'userSchoolId': studentNo,
'userPhoto': imageUrl, // Photo URL from Firebase Storage will be saved in here.
'editedAt': Date.now()
})
.then(() => {
loading.dismiss();
this.toast('Update Success', 'success');
this.closePopOver();
})
.catch(error => {
loading.dismiss();
this.toast(error.message, 'danger');
})
}//
async uploadFile(id, files):Promise<any> {
if (files && files.length) {
try {
const task = await this.storage.ref('images').child(id).put(files[0]);
return this.storage.ref(`images/${id}`).getDownloadURL().toPromise();
} catch (error) {
console.log(error);
}
}
}
onPickImage() {
this.filePickerRef.nativeElement.click();
}
onFileChosen(event: Event) {
const pickedFile = (event.target as HTMLInputElement).files[0];
if (!pickedFile) {
return;
}
const fr = new FileReader();
fr.onload = () => {
const dataUrl = fr.result.toString();
this.selectedImage = dataUrl;
};
fr.readAsDataURL(pickedFile);
}
update-profile.component.html
<!-- For the Image -->
<div class="picker">
<img
class="img"
[src]="selectedImage"
*ngIf="selectedImage && showPreview"
>
</div>
<input type="file" accept=".jpg,.png" *ngIf="usePicker" #filePicker (change)="onFileChosen($event)"/>
<ion-button class="image-btn" (click)="onPickImage()">
<ion-icon name="camera" slot="icon-only"></ion-icon>
</ion-button>
<!-- Other Textual Information -->
<form #f="ngForm" (ngSubmit)="onSubmit(f)">
<ion-list lines="full">
<ion-item>
<ion-label position="floating">Full Name:</ion-label>
<ion-input name="fname" required type="text" [(ngModel)]="fname" #userCtrl="ngModel"></ion-input>
</ion-item>
<ion-item>
<ion-label position="floating">Student No:</ion-label>
<ion-input name="studentId" required type="number" [(ngModel)]="studentId" #studentIds="ngModel"></ion-input>
</ion-item>
<ion-button class="ion-margin" type="submit" expand="block" shape="round" [disabled]="!f.valid">Edit User</ion-button>
</ion-list>
</form>
最佳答案
我在您的代码中注意到了一些事情。
- 您打算使用
this.selectedImage
<input>
的选定文件上的变量标签(来自文件资源管理器的注释),但在下面的行中,您将其重新分配给 firestore 中图像的存储引用。
this.profileEditSub = this.auth.user$.subscribe((user) => {
...
this.selectedImage = user.userPhoto; // this line
});
- 您不需要
FileReader.readAsDataURL()
(除非您想使用Reference.putString()
)。根据Firebase Storage docs,您可以直接上传 File API对象,只需将其作为storage.ref().put(File)
中的参数传递即可。 Example from Firebase docs.
建议
对
src
使用单独的变量<img>
的,然后使用另一个变量来存储文件选择器的当前值 (<input type="file" />
)。使用
onFileChosen()
仅用于为文件资源管理器中选定的文件分配变量的回调。
update-profile.component.ts
currentImageUrl: string; // to store the downloadUrl of image to be displayed
selectedFiles: Array<File>; // to store selected files in the File Explorer
this.profileEditSub = this.auth.user$.subscribe(async (user) => {
...
/**
* you only store the storage reference (user.userPhoto) in firestore, not the download url,
* so you need to fetch it again
*/
this.currentImageUrl = await this.storage
.ref(user.userPhoto)
.getDownloadURL()
.toPromise();
});
onFileChosen(event: any) {
this.selectedFiles = event.target.files; // just assigns the selected file/s in <input> this.selectedFiles
}
async onSubmit() {
if (this.selectedFiles.length) {
// Get selected file
const file = this.selectedFiles[0];
// Get the fullPath in Storage after upload
const fullPathInStorage = await this.uploadImage(this.userId, file);
/**
* You can now store the fullPathInStorage in firestore
*
* afs.update(...)
*/
// Get the downloadUrl for the src of img
this.currentImageUrl = await this.storage
.ref(fullPathInStorage)
.getDownloadURL()
.toPromise();
}
}
async uploadImage(uid, file): Promise<string> {
/**
* You can add random number in file.name to avoid overwrites,
* or replace the file.name to a static string if you intend to overwrite
*/
const fileRef = this.storage.ref(uid).child(file.name);
// Upload file in reference
if (!!file) {
const result = await fileRef.put(file);
return result.ref.fullPath;
}
}
update-profile.component.html
<input type="file" (change)="onFileChosen($event)"/>
<img [src]="currentImageUrl" />
此外,ERR_NAME_NOT_RESOLVED
可能只是由于网络不稳定所致。
关于angular - 如何将照片上传到 Firebase 存储并在 Firestore 中插入照片 URL?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/66932550/