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[英]Angular 12: ERROR TypeError: Cannot read properties of undefined (reading 'nativeElement')
[英]Error: Cannot read properties of undefined (reading 'pipe') Angular12
我在發送 ajax 請求時遇到錯誤,
ERROR TypeError: Cannot read properties of undefined (reading 'pipe')
ajax-loader.interceptor.ts class
export class AjaxLoaderInterceptor implements HttpInterceptor {
private loaderProp = 'ajax_loader';
constructor(private activeAjaxLoadersService: ActiveAjaxLoadersService) {}
intercept(
request: HttpRequest<any>,
httpHandler: HttpHandler
): Observable<HttpEvent<any>> {
console.log('ajax loader', request);
const loaderName = request.headers.has(this.loaderProp)
? request.headers.get(this.loaderProp)
: null;
console.log('loaderName', loaderName);
const updatedHeaders = request.headers.has(this.loaderProp)
? request.headers.delete(this.loaderProp)
: request.headers;
const updatedRequest = request.clone({ headers: updatedHeaders });
console.log('updatedHeaders', updatedHeaders, updatedRequest);
this.updateLoaderState(loaderName, XHR_REQUEST_STATES.PROGRESS);
return httpHandler.handle(updatedRequest).pipe(
tap((event: HttpEvent<any>) => {
console.log('httpHandler', event);
if (event instanceof HttpResponse) {
this.updateLoaderState(loaderName, 'success', event);
}
}),
(responseError: any): any => {
if (responseError instanceof HttpErrorResponse) {
}
}
);
}
Providers code:
providers: [
{
provide: HTTP_INTERCEPTORS,
useClass: AjaxLoaderInterceptor ,
multi: true
}
]
相同的代碼在 angular 8 中工作,但升級到 v12 后它壞了。
我在 stackblitz 中創建了可重現的代碼示例,請在此處找到示例
任何幫助,將不勝感激。 謝謝!
在您的 ajax-loader.interceptor.ts 文件中,在 if 條件之后添加 return 語句,如下所示
if (responseError instanceof HttpErrorResponse) {
}
return responseError;
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