angular - angular2 + 文件上传进度指示器

Question

我有一个现有的表单上传组件，它可以将文件上传到后端，这工作正常，但问题是我没有任何视觉指标来表明有多少文件，即文件的百分比已上传到服务器。我相信这是我的这个组件中缺少的非常需要的功能。此时此刻Please wait源于 app-loader.service.ts（截图），

是否有可能我可以Please wait通过% of file uploaded上传进行修改。我在网上看到了很多使用进度条的答案，但我宁愿有一个对我有意义并根据我的具体情况量身定制的解决方案。

表单上传.component.ts

import {  Component,  ViewChild, } from '@angular/core';
import { FormGroup } from '@angular/forms';
import { Subscription } from 'rxjs/Subscription';
import { Observer  } from 'rxjs/Observer';
import { HttpClient} from '@angular/common/http';
import { TranslateService } from '@ngx-translate/core';
import { FieldConfig } from '../../models/field-config.interface';
import { WebSocketService, DialogService } from '../../../../../../services/';
import { AppLoaderService } from '../../../../../../services/app-loader/app-loader.service';
import { Http } from '@angular/http';
import { MatSnackBar } from '@angular/material';


@Component({
  selector: 'app-form-upload',
  templateUrl: './form-upload.component.html',
  styleUrls: ['../dynamic-field/dynamic-field.css', 'form-upload.component.css'],
})
export class FormUploadComponent {
  @ViewChild('fileInput') fileInput;
  config: FieldConfig;
  group: FormGroup;
  fieldShow: string;
  public busy: Subscription[] = [];
  public sub: Subscription;
  public observer: Observer < any > ;
  public jobId: Number;
  public fileBrowser = true;
  public apiEndPoint = '/_upload?auth_token=' + this.ws.token;

  constructor(
    protected ws: WebSocketService, protected http: Http, private loader: AppLoaderService,
    private dialog:DialogService, public snackBar: MatSnackBar, public translate: TranslateService) {}

  upload(location = "/tmp/") {
    if(this.config.updater && this.config.parent ){
      this.config.updater(this, this.config.parent);
      return;
    }
  this.loader.open();

  const fileBrowser = this.fileInput.nativeElement;
  if (fileBrowser.files && fileBrowser.files[0]) {
    const formData: FormData = new FormData();
    formData.append('data', JSON.stringify({
      "method": "filesystem.put",
      "params": [location + '/' + fileBrowser.files[0].name, { "mode": "493" }]
    }));
    formData.append('file', fileBrowser.files[0]);

    this.http.post(this.apiEndPoint, formData).subscribe(
      (data) => {
        this.newMessage(location + '/' + fileBrowser.files[0].name);
        this.loader.close();
        this.snackBar.open("File upload complete.", 'close', { duration: 5000 });
      },
      (error) => {
        this.loader.close();
        this.dialog.errorReport(error.status, error.statusText, error._body);
      }
    );
  } else{
    this.loader.close();
  };
}
newMessage(message){
  if(this.config.message){
    this.config.message.newMessage(message);
  }

}
}

form-upload.component.html

 <div id="{{config.name}}" class="dynamic-field form-input" [formGroup]="group" [ngClass]="fieldShow" [class.has-tooltip]="config.tooltip" *ngIf="!config.isHidden">
  <div class="top">
    <label>{{ config.placeholder | translate }}</label>
    <tooltip *ngIf="config.tooltip" [message]="config.tooltip"></tooltip>
  </div>
  <div *ngIf="config.hideButton;else showButton">
      <mat-card-content>
          <input type="file" #fileInput accept="{{config.acceptedFiles}}" (change)="upload(config.fileLocation)" [formControlName]="config.name">
      </mat-card-content>
  </div>
  <ng-template #showButton>
      <mat-card-content>
          <input type="file" #fileInput accept="{{config.acceptedFiles}}" [formControlName]="config.name">
      </mat-card-content>
      <mat-card-actions class="buttons">
          <button mat-button type="button" (click)="upload(config.fileLocation)">Upload</button>
      </mat-card-actions>
      <mat-error *ngIf="config.hasErrors">{{config.errors}}</mat-error>
  </ng-template>
</div>

应用程序加载器.service.ts

import { Injectable } from '@angular/core';
import { MatDialog, MatDialogRef } from '@angular/material';
import { Observable } from 'rxjs/Rx';
import { AppLoaderComponent } from './app-loader.component';
import { TranslateService } from '@ngx-translate/core';
import { T } from '../../translate-marker';

@Injectable()
export class AppLoaderService {
  dialogRef: MatDialogRef<AppLoaderComponent>;
  constructor(private dialog: MatDialog, private translate: TranslateService) { }

  public open(title: string = T('Please wait')): Observable<boolean> {
    this.translate.get(title).subscribe(t => {
      this.dialogRef = this.dialog.open(AppLoaderComponent, {disableClose: true});
      this.dialogRef.updateSize('200px', '200px');
      this.dialogRef.componentInstance.title = t;
    });
    return this.dialogRef.afterClosed();
  }

  public close() {
    this.dialogRef.close();
  }
}

标签： angulartypescriptfile-uploadmultipartform-data

Answer 1

我在查看 https://malcoded.com/posts/angular-file-upload-component-with-express 的源代码后提出的src/app/upload/upload.service.ts解决方案

如果有人感兴趣，这里是差异。

diff --git a/src/app/pages/common/entity/entity-form/components/form-upload/form-upload.component.ts b/src/app/pages/common/entity/entity-form/components/form-upload/form-upload.component.ts
index 68be9cdf5..2aec0dd86 100644
--- a/src/app/pages/common/entity/entity-form/components/form-upload/form-upload.component.ts
+++ b/src/app/pages/common/entity/entity-form/components/form-upload/form-upload.component.ts
@@ -2,13 +2,13 @@ import {  Component,  ViewChild, } from '@angular/core';
 import { FormGroup } from '@angular/forms';
 import { Subscription } from 'rxjs/Subscription';
 import { Observer  } from 'rxjs/Observer';
-import { HttpClient} from '@angular/common/http';
+import { HttpClient, HttpRequest, HttpEventType, HttpResponse } from '@angular/common/http';
 import { TranslateService } from '@ngx-translate/core';
 import { FieldConfig } from '../../models/field-config.interface';
-import { WebSocketService, DialogService } from '../../../../../../services/';
+import { WebSocketService } from '../../../../../../services/';
 import { AppLoaderService } from '../../../../../../services/app-loader/app-loader.service';
-import { Http } from '@angular/http';
 import { MatSnackBar } from '@angular/material';
+import { DialogService } from '../../../../../../services/';


 @Component({
@@ -27,10 +27,10 @@ export class FormUploadComponent {
   public jobId: Number;
   public fileBrowser = true;
   public apiEndPoint = '/_upload?auth_token=' + this.ws.token;
-
+
   constructor(
-    protected ws: WebSocketService, protected http: Http, private loader: AppLoaderService,
-    private dialog:DialogService, public snackBar: MatSnackBar, public translate: TranslateService) {}
+    protected ws: WebSocketService,protected http: HttpClient, private loader: AppLoaderService,
+    public dialog: DialogService, public snackBar: MatSnackBar, public translate: TranslateService) {}

   upload(location = "/tmp/") {
     if(this.config.updater && this.config.parent ){
@@ -47,21 +47,29 @@ export class FormUploadComponent {
       "params": [location + '/' + fileBrowser.files[0].name, { "mode": "493" }]
     }));
     formData.append('file', fileBrowser.files[0]);
+    const req = new HttpRequest('POST', this.apiEndPoint, formData, {
+      reportProgress: true
+    });
+    this.http.request(req).subscribe(event => {
+      if (event.type === HttpEventType.UploadProgress) {
+        const percentDone = Math.round(100 * event.loaded / event.total);
+        const upload_msg = `${percentDone}% Uploaded`
+        this.loader.dialogRef.componentInstance.title = upload_msg;
+
+      } else if (event instanceof HttpResponse) {
+        if(event.statusText==="OK") {
+          this.newMessage(location + '/' + fileBrowser.files[0].name);
+          this.loader.close();
+          this.snackBar.open("File upload complete.", 'close', { duration: 5000 });
+        }
+      };
+    },(error)=> {
+      this.loader.close();
+      this.dialog.errorReport("Error",error.statusText, error.message);

-    this.http.post(this.apiEndPoint, formData).subscribe(
-      (data) => {
-        this.newMessage(location + '/' + fileBrowser.files[0].name);
-        this.loader.close();
-        this.snackBar.open("File upload complete.", 'close', { duration: 5000 });
-      },
-      (error) => {
-        this.loader.close();
-        this.dialog.errorReport(error.status, error.statusText, error._body);
-      }
-    );
-  } else{
-    this.loader.close();
-  };
+    });
+
+  }
 }
 newMessage(message){
   if(this.config.message){
(END)