Observable 类型上不存在 TS2339 属性 xxx 的问题
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【中文标题】Observable 类型上不存在 TS2339 属性 xxx 的问题【英文标题】:Problem with TS2339 Property xxx does not exist on type Observable 【发布时间】:2020-04-22 11:37:10 【问题描述】:似乎我的部分问题是加载内容的方式。当我在我的构造函数中调用 createForm 函数时,它会尝试访问 this.paswdProfile.numbers 和其他变量,这些变量是 ngOnInit 的一部分并且还没有用,所以它失败了。如果我将表单移动到 ngOnInit,它会抱怨没有 FormGroup 等。那么如何确保在 passwdProfile 有数据之后创建表单字段?
import IBucket from '../../../../models/bucket';
import Component, OnInit, Inject, Output, EventEmitter from '@angular/core';
import FormGroup, FormControl, Validators, FormBuilder from '@angular/forms';
import ActivatedRoute, Router from '@angular/router';
import AdminService from '../../../../services/admin.service';
import MAT_DIALOG_DATA, MatDialog, MatDialogRef from '@angular/material';
import Observable from 'rxjs';
import CouchbaseLookupService from '../../../../services/couchbase-lookup.service';
import takeWhile from 'rxjs/operators';
import ToasterService from 'angular2-toaster';
import CustomValidators from './custom-validators';
import IPasswordProfile from '../../../../models/admin'
@Component(
selector: 'app-password',
templateUrl: './password.component.html',
styleUrls: ['./password.component.scss']
)
export class PasswordComponent implements OnInit
public passwordForm: FormGroup;
alive = true;
paswdProfile$: Observable<IPasswordProfile>
paswdProfile: IPasswordProfile
constructor(@Inject(MAT_DIALOG_DATA) public data: any, private dialogRef: MatDialogRef<PasswordComponent>,
private adminService: AdminService, private route: ActivatedRoute, private cbLookupService: CouchbaseLookupService,
private router: Router, private dialog: MatDialog, private toasterService: ToasterService, private fb: FormBuilder)
this.passwordForm = this.createPasswordForm()
ngOnInit()
this.paswdProfile$ = this.adminService.getPasswordProfile("8084ea42-633e-4c28-bc7a-372aa58a4d1c")
this.paswdProfile$.subscribe(res => this.paswdProfile = res[0])
console.log(this.paswdProfile)
createPasswordForm(): FormGroup
return this.fb.group(
oldPassword : [ null, Validators.compose([Validators.required])],
newPassword: [
null,
Validators.compose([
Validators.required,
// check whether the entered password has a number
CustomValidators.patternValidator(/\d/g, this.paswdProfile.numbers ,
hasNumber: true
),
// check whether the entered password has upper case letter
CustomValidators.patternValidator(/[A-Z]/g, this.paswdProfile.upperCase,
hasCapitalCase: true
),
// check whether the entered password has a lower case letter
CustomValidators.patternValidator(/[a-z]/g, this.paswdProfile.lowerCase,
hasSmallCase: true
),
// check whether the entered password has a special character
CustomValidators.patternValidator(
/[ !@#$%^&*()_+\-=\[\];':"\\|,.<>\/?]/g, this.paswdProfile.specialChar ,
hasSpecialCharacters: true
),
Validators.minLength(this.paswdProfile.minChar)
])
],
confirmPassword: [null, Validators.compose([Validators.required])]
,
// check whether our password and confirm password match
validator: CustomValidators.passwordMatchValidator
);
【问题讨论】:
这篇文章的浏览量是奇数。不像这是一个不寻常的问题。 【参考方案1】:您没有获得对该对象的引用。你会得到对 Observable 的引用。您需要订阅 Observable 并存储结果。这是异步完成的。
this.adminService.getPasswordProfile("8084ea42-633e-4c28-bc7a-372aa58a4d1c")
.subscribe(profile => this.paswdProfile$ = profile);
【讨论】:
这解决了一些问题,但由于我的表单是作为构造函数的一部分构建表单构建器,因此 this.passwordProfile 未初始化并会引发错误 在从 Observable 获取结果后,您只能在箭头函数中构建表单。 我最终做到了这一点,但还添加了一个标志,因此模板在创建表单并且我们有数据之前不会呈现【参考方案2】:如果您在模板中使用该值,则需要使用https://angular.io/api/common/AsyncPipe 来访问可观察值。
如果你想在 .ts 文件中访问它,你需要订阅它并等待它解析:
this.paswdProfile$.subscribe(profile =>
const numbers = profile.numbers;
);
【讨论】:
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