从后端初始化表单值答案

【问题标题】：Initialize form values from Backend从后端初始化表单值
【发布时间】：2017-06-10 09:21:19
【问题描述】：

我有以下服务来获取数据。我正在按预期获取数据

export class UserService {
user: User
    private userSource = new Subject<User>();
    currentUser = this.userSource.asObservable();

constructor(http: Http){}

resolve(route: ActivatedRouteSnapshot){
      return this.http.get('/getUserData')
        .map(output => {
            console.log("IN RESOLVE. OUTPUT = ");
            console.log(output as User);        // Getting output here as expected
            return output as User;
        })
 }}

用户模型

export clsss User {
constructor(public Basic: {mob: string; email: string},
        public other: {abc: string; xyz: string  }) {}

基本组件.ts

export class BasicComponent implements OnInit {
basicForm: FormGroup;
user: User;

constructor(private fb: FormBuilder, public userService: UserService) { }

ngOnInit() {
        this.userService.currentUser.subscribe(
            result => {
              console.log(result)
             this.user = result
            })
        this basicForm = this.fb.group({
              mob: [this.user.mob, Validators.compose([Validators.required, Validators.minLength(10)],
              email: ['', Validators.compose([Validators.required, EmailValidator.isValidMailFormat])]
        })
}}

我希望预先填写这些值。但是user 对象显示undefined。这是最少的代码。我还有其他组件，例如BasicComponent，每个组件都有forms。我已经包含了所有依赖项和其他声明。它工作正常，除了我没有在 Formbuilder 中获取用户对象

我错过了什么？

【问题讨论】：

标签： angular angular2-forms angular2-services angular2-observables

【解决方案1】：

export class BasicComponent implements OnInit {
basicForm: FormGroup;
user: User;

constructor(private fb: FormBuilder, public userService: UserService) { }

ngOnInit() {
        let __self = this;
        this.userService.currentUser.subscribe(result => {
             console.log(result)
             __self.user = result;
             __self contact = __self.fb.group({
                    mob: [__self.user.mob, Validators.compose([Validators.required, Validators.minLength(10)],
                    email: ['', Validators.compose([Validators.required, EmailValidator.isValidMailFormat])]
                });
            });
}}

【讨论】：

区别在哪里？？
错误：formGroup 需要一个 FormGroup 实例。请传入一个
basicForm: FormGroup; 和 this contact = this.fb.group 怎么样？

【解决方案2】：

试试这个方法

 ngOnInit() {
        // Build the form
        this.basicForm = this.fb.group({
            'business_name' : ['', Validators.required],
            'email'   : ['', Validators.required],
        });
        // Fetch data for the view
         this.userService.currentUser.subscribe(
            result => {
              console.log(result)
             this.user = result

             this.basicForm.setValue({
                business_name: response.data.business.business_name,
                email: response.data.business.email
            });


        })
    }

【讨论】：