藉助現有的course course材質教程,我能夠嘗試使用http和訂閱場景與Angular 4控件。當我在第一時間獲取所有照片時,我發現UI存在滯後。因此,我想到了實現微調加載數據md-progress-spinner的印象,但由於某種原因微調不顯示&而且我也沒有看到任何控制檯日誌,你能否建議?Angular Material 2 Spinner with Angular 4
spinner.service.ts:
import {Injectable} from '@angular/core';
import {Subject} from 'rxjs/Subject';
@Injectable()
export class SpinnerService {
public status: Subject<boolean> = new Subject();
private _active: boolean = false;
public get active(): boolean {
return this._active;
}
public set active(v: boolean) {
this._active = v;
this.status.next(v);
}
public start(): void {
this.active = true;
}
public stop(): void {
this.active = false;
}
}
app.module.ts:
@NgModule({
declarations: [
AppComponent,
SpinnerComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
BrowserAnimationsModule,
MdButtonModule,
MdMenuModule,
MdCardModule,
MdToolbarModule,
MdIconModule,
MdProgressSpinnerModule
],
providers: [SpinnerService],
bootstrap: [AppComponent]
})
export class AppModule { }
app.component.ts:
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
myData: Array<any>;
constructor(private http:Http,private spinner: SpinnerService) {
this.spinner.start();
this.http.get('https://jsonplaceholder.typicode.com/photos')
.map(response => response.json())
.subscribe(res => this.myData = res,
error => console.error(error),
() => this.spinner.stop()
);
}
}
app.component.html:
<app-spinner>Spinning...</app-spinner>
<md-toolbar color="primary">
<span>MyCompany</span>
<span class="example-spacer"></span>
<button md-button [mdMenuTriggerFor]="appMenu"><md-icon>menu</md-icon> Menu</button>
</md-toolbar>
<md-menu #appMenu="mdMenu">
<button md-menu-item> Settings </button>
<button md-menu-item> Help </button>
</md-menu>
<md-card class="example-card" *ngFor="let data of myData; let i = index">
<!--<md-card class="example-card" *ngFor="let data of (myData ? myData.slice(0,10): []); let i = index"> -->
<img md-card-image src="{{ data.url }}">
<md-card-header>
<md-card-title>{{ data.title }}</md-card-title>
</md-card-header>
<md-card-actions>
<button md-button>LIKE</button>
<button md-button>SHARE</button>
</md-card-actions>
</md-card>
spinner.component.ts:
@Component({
selector: 'app-spinner',
templateUrl: './spinner.component.html',
styleUrls: ['./spinner.component.css']
})
export class SpinnerComponent implements OnInit, OnDestroy {
public active: boolean;
public constructor(private spinner: SpinnerService) {
spinner.status.subscribe((status: boolean) => {
this.active = status;
});
}
ngOnInit(){
this.spinner.stop(); // or do it on some other event eg: when xmlhttp request completes loading data for the component
}
ngOnDestroy(){
this.spinner.start();
}
}
spinner.component.html:
<div *ngIf="active">
<md-progress-spinner mode="indeterminate"></md-progress-spinner>
</div>
請檢查我我在加載微調器時犯了一些錯誤,我的願景是讓這個微調器跨越多個應用程序通過讓應用程序微調選擇器僅在app.component.html
中提到,可以請求通知上述方法是否良好&需要進行任何更改?
在米y case spinner is displayed up and my spinner control is in app.component.html - > router-outlet> - >我可以看到微調框,但背景不灰色。 。如何保持微調,但灰色背景在我的情況 ??你找到解決方案嗎? –