我创建了AuthHttpProvider,它是Http包装器,允许发送GET / POST / PUT / DELETE请求并自动为每个请求添加身份验证令牌(jwt).我在所有的ionic2应用程序中使用这个包装器而不是Http.现在,当我检测到来自服务器的任何响应有403 Http错误代码时,我想注销用户(并转到loginPage).
因此,当我尝试在构造函数中注入NavController(在403检测后将其用于loginPage)
constructor (public navCtrl: NavController)
我明白了：
Uncaught (in promise): Error: No provider for NavController
如何访问Provider内的navCtrl？
这是解决方案(从
this)：
import { Injectable,Injector } from '@angular/core';
import { Http,Headers } from '@angular/http';
import { Observable } from "rxjs";
import 'rxjs/add/operator/map';
import { App } from "ionic-angular";
import { NavController } from "ionic-angular/index";
import { LoginPage } from "../../pages/login/login";
...
@Injectable()
export class AuthHttpProvider {
private navCtrl: NavController;
...
constructor(public http: Http,...,private app:App ) {
this.navCtrl = app.getActiveNav();
}
get(url) { // http GET
return this.http.get(url,this.getHeaders() )
.catch(this.globalErr(this));
}
// ... http POST/PUT/DELETE
private getHeaders() { ... } //(cors,csrf-token ...)
private globalErr(self) {
return (err) => {
if ( err.status == 403 ) { self.logout(); }
return Observable.throw(err);
};
}
public logout() {
// ...
this.navCtrl.setRoot(LoginPage);
this.navCtrl.popToRoot;
}
}
