[英]How to return Observable<boolean> in canActivate on a guarded route in Angular 6
[英]CanActivate in Angular 2 return undefined
我需要canActivate在json加載之前不要進一步跳過,為此,我檢查了canActivate是否未定義,它返回false,但是在控制台中它輸出了canActivate被傳遞並且值為undefined。 我正在做的事情是錯誤的,感謝您的幫助,我將不勝感激。
我的http-data.service
import {Injectable} from '@angular/core';
import {Http} from '@angular/http';
import {Response} from '@angular/http';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import {CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot} from "@angular/router";
@Injectable()
export class HttpService implements CanActivate{
constructor(private http: Http) {}
dataModules = this.getDataModules();
dataPresets = this.getDataPresets();
dataModuleItems = this.getDataModuleItems();
data: any[];
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) : Observable<boolean> | boolean {
if (this.getDataModules !== undefined) {
console.log('canActivate');
console.log(this.getDataModules());
return true;
} else return false;
}
getDataOrganizations(): Observable<any[]>{
return this.http.get('http://localhost:3010/data')
.map((resp:Response)=>{
let dataOrganizations = resp.json().organization;
return dataOrganizations;
});
}
loadDataModules(): Observable<any[]> {
return this.http.get('http://localhost:3010/data')
.map((resp: Response)=> {
let dataModules = resp.json().modules;
return dataModules;
});
}
loadDataPresets(): Observable<any[]> {
return this.http.get('http://localhost:3010/data')
.map((resp: Response)=> {
let dataPresets = resp.json().presets;
return dataPresets;
});
}
loadDataModuleItems(): Observable<any[]> {
return this.http.get('http://localhost:3010/data')
.map((resp: Response)=> {
let dataModuleItems = resp.json().module_items;
return dataModuleItems;
});
}
loadData() {
return this.http.get('http://localhost:3010/data')
.map((resp: Response)=> {
let data = resp.json();
return data;
});
}
getDataModules(): any[] {
this.loadDataModules().subscribe(((modules)=>{this.dataModules = modules; console.log('в http modules');console.log(this.dataModules);}));
return this.dataModules;
}
getDataPresets(): any[] {
this.loadDataPresets().subscribe(((presets)=>{this.dataPresets = presets; console.log(this.dataPresets);}));
return this.dataPresets;
}
getDataModuleItems(): any[] {
this.loadDataModuleItems().subscribe(((moduleItems)=>{this.dataModuleItems = moduleItems; console.log(this.dataModuleItems);}));
return this.dataModuleItems;
}
}
] 2
在您訂閱響應之前,您的數據將是undefined
getDataOrganizations(): Observable<any[]>{
let dataOrganizations :any[]
return this.http.get('http://localhost:3010/data')
.map(response => response.json().organization)
.subscribe(data => {
dataOrganizations = data;
return dataOrganizations;
});
}
現在您將得到對象
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