Informationen zur Verwendung benutzerdefinierter Formularsteuerelemente in Angular19

interface ControlValueAccessor { 
 writeValue(obj: any): void
 registerOnChange(fn: any): void
 registerOnTouched(fn: any): void
 setDisabledState(isDisabled: boolean)?: void
}

writeValue(obj: any): void

registerOnChange(fn: any): void

registerOnTouched(fn: any): void

setDisabledState(isDisabled: boolean)?: void

import { Component, OnInit } from '@angular/core';
import { ControlValueAccessor } from '@angular/forms';
@Component({
 selector: 'app-counter',
 templateUrl: './counter.component.html',
 styleUrls: ['./counter.component.scss']
})
export class CounterComponent implements OnInit {
 countNumber: number = 0;
 constructor() { }
 ngOnInit() {
 }
 onIncrease() {
 this.countNumber++;
 }
 onDecrease() {
 this.countNumber--;
 }
}

export class CounterComponent implements OnInit, ControlValueAccessor {
 countNumber: number = 0;
 constructor() { }
 ngOnInit() {
 }
 onIncrease() {
 this.countNumber++;
 }
 onDecrease() {
 this.countNumber--;
 }
 /**将数据从模型传输到视图 */
 writeValue(obj: any): void {
 }
 /**将数据从视图传播到模型 */
 registerOnChange(fn: any): void {
 }
 registerOnTouched(fn: any): void {
 }
 setDisabledState?(isDisabled: boolean): void {
 }
}

import { Component, OnInit, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
@Component({
 selector: 'app-counter',
 templateUrl: './counter.component.html',
 styleUrls: ['./counter.component.scss'],
 providers: [
 {
  provide: NG_VALUE_ACCESSOR,
  useExisting: forwardRef(() => CounterComponent),
  multi: true
 }
 ]
})
export class CounterComponent implements OnInit, ControlValueAccessor {
 countNumber: number = 0;
 constructor() { }
 ngOnInit() {
 }
 onIncrease() {
 this.countNumber++;
 }
 onDecrease() {
 this.countNumber--;
 }
 /**将数据从模型传输到视图 */
 writeValue(obj: any): void {
 }
 /**将数据从视图传播到模型 */
 registerOnChange(fn: any): void {
 }
 registerOnTouched(fn: any): void {
 }
 setDisabledState?(isDisabled: boolean): void {
 }
}

propagateChange = (_: any) => {};

 /**将数据从视图传播到模型 */
 registerOnChange(fn: any): void {
 this.propagateChange = fn;
 }

import { Component, OnInit, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
@Component({
 selector: 'app-counter',
 templateUrl: './counter.component.html',
 styleUrls: ['./counter.component.scss'],
 providers: [
 {
  provide: NG_VALUE_ACCESSOR,
  useExisting: forwardRef(() => CounterComponent),
  multi: true
 }
 ]
})
export class CounterComponent implements OnInit, ControlValueAccessor {
 countNumber: number = 0;
 propagateChange = (_: any) => {};
 constructor() { }
 ngOnInit() {
 }
 onIncrease() {
 this.countNumber++;
 this.propagateChange(this.countNumber);
 }
 onDecrease() {
 this.countNumber--;
 this.propagateChange(this.countNumber);
 }
 /**将数据从模型传输到视图 */
 writeValue(obj: any): void {
 this.countNumber = obj;
 }
 /**将数据从视图传播到模型 */
 registerOnChange(fn: any): void {
 /**fn其实是一个函数，当视图中的数据改变时就会调用fn指向的这个函数，从而达到将数据传播到模型的目的 */
 this.propagateChange = fn; // 将fn的指向赋值给this.propagateChange，在需要将改变的数据传到模型时只需要调用this.propagateChange方法即可
 }
 registerOnTouched(fn: any): void {
 }
 setDisabledState?(isDisabled: boolean): void {
 }
}

<p class="panel panel-primary">
 <p class="panel-heading">面板模板</p>
 <p class="panel-body">
 <h3>面板测试内容</h3>
 </p>
 <p class="panel-footer">2018-1-22 10:22:20</p>
</p>

<p class="panel-primary">
 <p class="panel-heading">自定义提取表单控件</p>
 <p class="panel-body">
 <form #myForm=ngForm>
  <app-counter name="counter" [(ngModel)]="countNumber">
  </app-counter>
 </form>
 <h6>绿线上是自定义提取的表单控件显示的内容</h6>
 <hr style="border: solid green 2px" />
 <h6>绿线下是使用自定义表单控件时表单的实时数据</h6>
 <h3>表单控件的值为：{{myForm.value | json}}</h3>
 </p>
 <p class="panel-footer">2018-1-31 10:09:17</p>
</p>

<p class="panel-primary">
 <p class="panel-heading">提取表单控件</p>
 <p class="panel-body">
 <form #form="ngForm">
  <p>outerCounterValue value: {{outerCounterValue}}</p>
  <app-exe-counter name="counter" [(ngModel)]="outerCounterValue"></app-exe-counter>
  <br />
  <button md-raised-button type="submit">Submit</button>
  <br />
  <p>
  {{form.value | json}}
  </p>
 </form>
 </p>
 <p class="panel-footer">2018-1-27 21:51:45</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">ngIf指令测试</p>
 <p class="panel-body">
 <button md-rasied-button (click)="onChangeNgifValue()">改变ngif变量</button>
 <br />
 <p *ngIf="ngif; else ngifTrue" >
  <h4 style="background-color: red; color: white" >ngif变量的值为true</h4>
 </p>
 <ng-template #ngifTrue>
  <h4 style="background-color: black; color: white">ngif变量的值为false</h4>
 </ng-template>
 </p>
 <p class="panel-footer">2018-1-27 16:58:17</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">RXJS使用</p>
 <p class="panel-body">
 <h4>测试内容</h4>
 </p>
 <p class="panel-footer">2018-1-23 21:14:49</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">自定义验证器</p>
 <p class="panel-body">
 <form (ngSubmit)="onTestLogin()" [formGroup]="loginForm">
  <md-input-container>
  <input mdInput placeholder="请输入登录名" formControlName="username" />
  </md-input-container>
  <br />
  <md-input-container>
  <input mdInput placeholder="请输入密码" formControlName="userpwd" />
  </md-input-container>
  <br />
  <button type="submit" md-raised-button>登陆</button>
 </form>
 </p>
 <p class="panel-footer">2018-1-23 11:06:01</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">响应式表单</p>
 <p class="panel-body">
 <form [formGroup]="testForm">
  <md-input-container>
  <input mdInput type="text" placeholder="请输入邮箱" formControlName="email" />
  <span mdSuffix>@163.com</span> 
  </md-input-container>
  <br />
  <md-input-container>
  <input mdInput type="password" placeholder="请输入密码" formControlName="password" />
  </md-input-container>
 </form>
 <hr />
 <p>
  <h2>表单整体信息如下：</h2>
  <h4>表单数据有效性：{{testForm.valid}}</h4>
  <h4>表单数据为：{{testForm.value | json}}</h4>
  <h4>获取单个或多个FormControl：{{testForm.controls[&#39;email&#39;] }}</h4>
  <hr />
  <h2>email输入框的信息如下：</h2>
  <h4>有效性：{{testForm.get(&#39;email&#39;).valid}}</h4>
  <h4>email输入框的错误信息为：{{testForm.get(&#39;email&#39;).errors | json}}</h4>
  <h4>required验证结果：{{testForm.hasError(&#39;required&#39;, &#39;email&#39;) | json}}</h4>
  <h4>minLength验证结果：{{ testForm.hasError(&#39;minLength&#39;, &#39;email&#39;) | json }}</h4>
  <h4>hello:{{ testForm.controls[&#39;email&#39;].errors | json }}</h4>
  <hr />
  <h2>password输入框啊的信息如下：</h2>
  <h4>有效性：{{testForm.get(&#39;password&#39;).valid}}</h4>
  <h4>password输入框的错误信息为：{{testForm.get(&#39;password&#39;).errors | json }}</h4>
  <h4>required验证结果：{{testForm.hasError(&#39;required&#39;, &#39;password&#39;) | json}}</h4>
 </p>
 <p>
  <button nd-rasied-button (click)="onTestClick()">获取数据</button>
  <h4>data变量：{{data}}</h4>
 </p>
 </p>
 <p class="panel-footer">2018-1-22 15:58:43</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">利用响应式编程实现表单元素双向绑定</p>
 <p class="panel-body">
 <md-input-container>
  <input mdInput placeholder="请输入姓名（响应式双向绑定）：" [formControl]="name"/>
 </md-input-container>
 <p>
  姓名为：{{name.value}}
 </p>
 </p>
 <p class="panel-footer">2018-1-22 11:12:35</p>
</p> -->

<p class="panel panel-primary">
 <p class="panel-heading">模板表单</p>
 <p class="panel-body">
 <md-input-container>
  <input mdInput placeholder="随便输入点内容" #a="ngModel" [(ngModel)]="desc" name="desc" />
  <button type="button" md-icon-button mdSuffix (click)="onTestNgModelClick()">
  <md-icon>done</md-icon>
  </button>
 </md-input-container>
 <p>
  <h3>名为desc的表单控件的值为：{{ a.value }}</h3>
 </p>
 </p>
 <p class="panel-footer">2018-1-22 10:19:31</p>
</p>

<p class="panel panel-primary">
 <p class="panel-heading">md-chekbox的使用</p>
 <p calss="panel-body">
 <p>
  <md-checkbox #testCheckbox color="primary" checked="true">测试</md-checkbox>
 </p>
 <p *ngIf="testCheckbox.checked">
  <h2>测试checkbox被选中啦</h2>
 </p>
 </p>
 <p class="panel-footer">2018-1-18 14:02:20</p>
</p> 

<p class="panel panel-primary">
 <p class="panel-heading">md-tooltip的使用</p>
 <p class="panel-body">
 <span md-tooltip="重庆火锅">鼠标放上去</span>
 </p>
 <p class="panel-footer">2018-1-18 14:26:58</p>
</p>


<p class="panel panel-primary">
 <p class="panel-heading">md-select的使用</p>
 <p class="panel-body">
 <md-select placeholder="请选择目标列表" class="fill-width" style="height: 40px;">
  <md-option *ngFor="let taskList of taskLists" [value]="taskList.name">{{taskList.name}}</md-option>
 </md-select>
 </p>
 <p class="panel-footer">2018-1-18 14:26:58</p>
</p> 

<p class="panel panel-primary">
 <p class="panel-heading">ngNonBindable指令的使用</p>
 <p class="panel-body">
 <h3>描述</h3>
 <p>使用了ngNonBindable的标签，会将该标签里面的元素内容全部都看做时纯文本</p>
 <h3>例子</h3>
 <p>
  <span>{{taskLists | json }}</span>
  <span ngNonBindable>← 这是{{taskLists | json }}渲染的内容</span>
 </p>
 </p>
 <p class="panel-footer">2018-1-19 09:34:26</p>
</p>

import { Component, OnInit, HostListener, Inject} from '@angular/core';
import { FormControl, FormGroup, FormBuilder, Validators } from '@angular/forms';
import { Http } from '@angular/http';
import { QuoteService } from '../../service/quote.service';
@Component({
 selector: 'app-test01',
 templateUrl: './test01.component.html',
 styleUrls: ['./test01.component.scss']
})
export class Test01Component implements OnInit {
 countNumber: number = 9;
 outerCounterValue: number = 5; 
 ngif = true;
 loginForm: FormGroup;
 testForm: FormGroup;
 data: any;
 name: FormControl = new FormControl();
 desc: string = 'hello boy';
 taskLists = [
 {label: 1, name: '进行中'},
 {label: 2, name: '已完成'}
 ];
 constructor(
 private formBuilder: FormBuilder,
 private http: Http,
 @Inject('BASE_CONFIG') private baseConfig,
 private quoteService: QuoteService
 ) {}
 ngOnInit() {
 this.testForm = new FormGroup({
  email: new FormControl('', [Validators.required, Validators.minLength(4)], []),
  password: new FormControl('', [Validators.required], [])
 });
 this.name.valueChanges
 .debounceTime(500)
 .subscribe(value => alert(value));
 this.loginForm = this.formBuilder.group({
  username: ['', [Validators.required, Validators.minLength(4), this.myValidator], []],
  userpwd: ['', [Validators.required, Validators.minLength(6)], []]
 });
 this.quoteService.test()
 .subscribe(resp => console.log(resp));
 }
 onChangeNgifValue() {
 if (this.ngif == false) {
  this.ngif = true;
 } else {
  this.ngif = false;
 }
 }
 @HostListener('keyup.enter')
 onTestNgModelClick() {
 alert('提交');
 }
 onTestClick() {
 // this.data = this.testForm.get('email').value;
 // console.log(this.testForm.getError);
 console.log(this.testForm.controls['email']);
 }
 onTestLogin() {
 console.log(this.loginForm.value);
 if (this.loginForm.valid) {
  console.log('登陆数据合法');
 } else {
  console.log('登陆数据不合法');
  console.log(this.loginForm.controls['username'].errors);
  console.log(this.loginForm.get('userpwd').errors);
 }
 }
 myValidator(fc: FormControl): {[key: string]: any} {
 const valid = fc.value === 'admin';
 return valid ? null : {myValidator: {requiredUsername: 'admin', actualUsername: fc.value}};
 }
}