问题描述
我正在尝试覆盖 NgxSpinner 的 show 和 hide 方法,以防止在进程持续时间太短时出现短时间显示微调器。
这是我在扩展 NgxSpinnerService 的类中的代码
import { Injectable } from '@angular/core';
import { NgxSpinnerService,Spinner } from 'ngx-spinner';
@Injectable({
providedIn: 'root'
})
export class SpinnerService extends NgxSpinnerService {
constructor() { super(); }
private ondisplay: boolean = false;
show (name?: string,spinner?: Spinner): Promise<unkNown> {
this.ondisplay = true;
setTimeout(() => {
console.log(`showing ${name} | ondisplay ${this.ondisplay}`);
if (this.ondisplay) return super.show(name,spinner);
},300);
return null;
}
hide (name?: string,debounce?: number): Promise<unkNown> {
this.ondisplay = false;
return super.hide(name,debounce);
}
}
constructor(
private _graphService: GraphsService,private _medicinesService: MedicinesServices,private _notification: NotificationService,private fb: FormBuilder,private spinner: SpinnerService
) { }
ngOnInit (): void {
this.init();
}
private init () {
this.spinner.show('component');
this._medicinesService.getAllGrupedBy().subscribe(
(data) => {
...
this.loadData();
},(error) => {
this._notification.showErrorToast(error.errorCode);
this.spinner.hide('component');
}
);
}
private loadData (): void {
this.spinner.show('component');
if (!this.selectedOption) this.selectedOption = this.options[0];
this.getData().subscribe(
(data) => {
...
this.spinner.hide('component');
},(error) => {
this.spinner.hide('component');
this._notification.showErrorToast(error.errorCode);
}
);
}
app.component.html 中的 HTML
<div [ngClass]="{ 'loading-container': !isMobileScreen }">
<ngx-spinner [name]="spinnersConf.component.name" [fullScreen]="false" [bdColor]="spinnersConf.component.bgColor">
<p style="font-size: 20px; color: white">{{ spinnersConf.component.text | translate }}</p>
</ngx-spinner>
</div>
控制台出现在开发人员工具窗口中,但不会显示微调器。但是,如果我从 NgxSpinnerService 中调用 show 方法,它将毫无问题地出现。
我的服务是否有任何错误?
解决方法
你好@LorenaSineiro 首先为加载器创建一个通用组件,当你调用你会看到的组件加载器的API时。
创建加载器组件后,添加或创建此文件 loader.interceptor.ts 和 loader.service.ts 以显示微调器。
loader.interceptor.ts
import { Injectable } from "@angular/core";
import {
HttpEvent,HttpHandler,HttpInterceptor,HttpRequest
} from "@angular/common/http";
import { Observable } from "rxjs";
import { finalize } from "rxjs/operators";
import { LoaderService } from "./loader.service";
import { NgxSpinnerService } from "ngx-spinner";
@Injectable()
export class LoaderInterceptor implements HttpInterceptor {
constructor(
public loaderService: LoaderService,private spinner: NgxSpinnerService
) {}
intercept(
req: HttpRequest<any>,next: HttpHandler
): Observable<HttpEvent<any>> {
this.loaderService.show();
return next.handle(req).pipe(finalize(() => this.loaderService.hide()));
}
}
loader.service.ts
import { Injectable } from "@angular/core";
import { NgxSpinnerService } from "ngx-spinner";
import { Subject } from "rxjs";
@Injectable()
export class LoaderService {
constructor(private spinner: NgxSpinnerService) {}
isLoading = new Subject<boolean>();
show() {
this.isLoading.next(true);
this.spinner.show();
}
hide() {
this.isLoading.next(false);
this.spinner.hide();
}
}
loader.component.html
<ngx-spinner bdColor="rgba(0,0.8)" size="medium" color="#fff" type="square-jelly-box" [fullScreen]="true">
<p style="color: white"> Loading... </p>
</ngx-spinner>
app.module.ts
providers: [
LoaderService,{ provide: HTTP_INTERCEPTORS,useClass: LoaderInterceptor,multi: true }
]
app.component.html
<div *ngIf="isLoading | async">
<app-loader></app-loader>
</div>
app.component.ts
import { HttpClient } from "@angular/common/http";
import { LoaderService } from "./loader/loader.service";
constructor(private http: HttpClient,private loaderService: LoaderService) {}
isLoading: Subject<boolean> = this.loaderService.isLoading;
data: any = [];
showData() {
this.data = [];
this.http.get("assets/dummyData.json").subscribe(data => {
this.data = data['employees'];
});
}
如果您在执行此操作时遇到困难,则可以访问我的 Stackblitz
如果您want
,这里有不同的 ngx-spinner