angular2 - 在组件之间传递数据对象

如果可能的话，寻求一些帮助。

我有一个位于一个组件中的数据对象，该数据对象是从 REST 调用接收到的。它包含我想跨组件共享的用户详细信息，但我遇到了麻烦。

将此对象传递给另一个组件以便我可以使用详细信息的最佳方法是什么？

前任。数据对象名为 user，我想与单独的组件共享从数据库创建并从 REST 调用接收到的 user._id。

感谢大家的帮助。

组件一（包含用户数据对象）：

import {Component} from 'angular2/core';
import {ROUTER_DIRECTIVES, Router, Location} from 'angular2/router';
import {Control, FORM_DIRECTIVES, NgIf} from 'angular2/common';
import {UserLogin} from './navbar.login.service';
import {LoginService} from './navbar.login.service';
import {AccountDataService} from '../account/account.data.service';
import {User} from '../account/account.model';

@Component({
selector: 'navbar',
templateUrl: './app/navbar/navbar.component.html',
directives: [ROUTER_DIRECTIVES],
providers: [LoginService, AccountDataService]
})

export class NavbarComponent {

model: UserLogin;
user: User;
message: string;

constructor(private _service: LoginService, public _userService: AccountDataService,
    private router: Router, private location: Location) {
    this.model = this._service.modelInstance();
    this.user = this._userService.modelInstance();
}

onSubmit() {

    this._service.rawPost('?username=' + this.model.userName
        + '&password=' + this.model.password)
        .subscribe(res => {
            if (res.status === 200) {
                this.message = 'You have been logged in with: ' + this.model.userName;
                this.router.navigate(['Dashboard']);
                this._userService.read('/username/' + this.model.userName)
                    .subscribe(user => {
                        this.user = user; // <--- NEED THIS OBJECT PASSED AND SHARED!!
                })
                    });
            } else {
                this.message = 'Username or Password is not correct';
            }
        },
        error => {
            console.log("Response = %s", JSON.stringify(error));
            if (error.status == 401) {
                this.message = 'Username or Password is not correct';
            }
        });

}

toggleMenu() {
    this.menuActive = !this.menuActive;
}

logout() { //NOT SURE ABOUT THIS!!!
    // clears browser history so a user can't navigate with back button
    // this.location.replaceState('/');
    this.router.navigate(['Home']);
}

第二部分需要调整。无法让上面的用户对象传入。此时甚至不知道从哪里开始。

import {Component, OnInit} from 'angular2/core';
import {UserCase} from './case/case.model';
import {User} from '../account/account.model';
import {ROUTER_DIRECTIVES} from 'angular2/router'; 
import {AccountDataService} from '../account/account.data.service';
import {NavbarComponent} from '../navbar/navbar.component';

@Component({
selector: 'dashboard',
templateUrl: './app/dashboard/dashboard.component.html',
directives: [NavbarComponent],
providers: [ROUTER_DIRECTIVES, AccountDataService],
})

export class DashboardComponent implements OnInit {

public user: User;
public userCase;
public userCases: UserCase[] = []

ngOnInit() {
    // Also trying to get each userCase object into the userCases array (not currently working)

    this._caseService.read('/user/' + this.user._id) //this.user not currently defined.
        .subscribe(userCase => {
            this.userCase = userCase;
        });

    this.userCases.push(this.userCase);
}

constructor(private _caseService: CaseDataService, private _userService: AccountDataService) {
    this.user = this._userService.modelInstance();
    this.userCase = this._caseService.modelInstance();
    this.userCases = [];
}

}

最好的方法是仅将数据作为“组件二”的输入传递。

所以，里面组成部分一， 你应该做：

<dashboard [user]="user"></dashboard>

和里面第二部分你应该添加：

@Input() user;

您将无法在组件二的承包商内访问此输入，只能在其“ngOnInit”内访问。看this https://stackoverflow.com/q/33561845/916450以供参考