Angular 7：基于产品构建：属性“服务”是私有的，只能在“组件”类中访问

Question

我正在使用 Angular 7。我运行这个 cmdng build --prod版本进行保护。

那个时候我缓存了这个错误（属性“服务”是私有的，只能在“登录组件”类中访问）：

ERROR in src\app\login\login.component.html(5,33): : Property 'service' is private and only accessible within class 'LoginComponent'.
src\app\login\login.component.html(18,104): : Property 'service' is private and only accessible within class 'LoginComponent'.

这是我的HTML 代码：

<div id="login_section" class="d-flex justify-content-center align-items-center">
    <div class="login_cnt col-8 row">
        <div class="col-6 d-flex justify-content-center py-4">
            
            <form class="col-8" [formGroup]="service.loginform">
                <h2 class="text-center">User Login</h2>
                <mat-form-field class="col-12">
                  <input matInput type="text" placeholder="Username" formControlName="username" >
                  <mat-error>Username is Required</mat-error>
                </mat-form-field>
              
                <mat-form-field class="col-12">
                  <input matInput [type]="hide ? 'password' : 'text'" formControlName="password" placeholder="Password">
                  <mat-icon matSuffix (click)="hide = !hide">{{hide ? 'visibility_off' : 'visibility'}}</mat-icon>
                  <mat-error>Password is Required</mat-error>
                </mat-form-field>
                <a href="#" class="float-left lnk_forgot h7">Forgot Password</a>
                <button mat-raised-button color="primary" class="float-right" [routerLink]="['/home']" [disabled]="service.loginform.invalid">Login</button>
              </form>
        </div>
    </div>
</div>

这是我的TS 文件：

import { Component, OnInit } from '@angular/core';
import { LoginService } from '../shared/login.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {
  username : string;
  password: string;
  hide = true;

  constructor(private service: LoginService) { }
  ngOnInit() {
  }

}

运行 ng serve 时没有抓住它。

Answer 1

有 2 种方法可以解决此问题。
1.
更改private service: LoginService为public service: LoginService
由于您在编译期间使用AOT，您无法在HTML模板中访问组件的私有属性。

2.

如果你想保持你的服务私有，你可以在控制器中提供一个返回服务属性的公共方法。您可以从 HTML 模板调用此方法。它会是这样的：

模板：

<div id="login_section" class="d-flex justify-content-center align-items-center">
    <div class="login_cnt col-8 row">
        <div class="col-6 d-flex justify-content-center py-4">

            <form class="col-8" [formGroup]="getLoginForm()"> <!-- Change here-->
                <h2 class="text-center">User Login</h2>
                <mat-form-field class="col-12">
                  <input matInput type="text" placeholder="Username" formControlName="username" >
                  <mat-error>Username is Required</mat-error>
                </mat-form-field>

                <mat-form-field class="col-12">
                  <input matInput [type]="hide ? 'password' : 'text'" formControlName="password" placeholder="Password">
                  <mat-icon matSuffix (click)="hide = !hide">{{hide ? 'visibility_off' : 'visibility'}}</mat-icon>
                  <mat-error>Password is Required</mat-error>
                </mat-form-field>
                <a href="#" class="float-left lnk_forgot h7">Forgot Password</a>
                <button mat-raised-button color="primary" class="float-right" [routerLink]="['/home']" [disabled]="getLoginForm().invalid">Login</button> <!-- Change here-->
              </form>
        </div>
    </div>
</div>

控制器：

import { Component, OnInit } from '@angular/core';
import { LoginService } from '../shared/login.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {
  username : string;
  password: string;
  hide = true;

  constructor(private service: LoginService) { }
  ngOnInit() {
  }

  getLoginForm() {
    return this.service.loginform;
  }
}

PS：我自己暂时没有测试第二个。