Question

我正在尝试在自定义“材料输入”文本框中使用ControlValueAccessor应用错误验证样式。自从应用此自定义组件以来，formControlName / FormBuilders的所有红色边框验证状态都不会显示（对于必需的，最小长度等）。它与Angular Material文本框一起（开箱即用）工作，直到应用了自定义控件。 / p>

目标是使自定义文本框与表单验证一起使用。使用matInput文本框自然显示了这一点。

更新：发表答案；但是不确定它是否最有效的方法（尝试使Saloo回答也起作用）（如果有人可以发布stackbliz，那将是很好的方法）是否接受任何更有效的方法

打字稿：

import { Component, OnInit, Input, ViewChild, EventEmitter, Output, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

@Component({
  selector: 'app-input-textbox',
  templateUrl: './input-textbox.component.html',
  styleUrls: ['./input-textbox.component.scss'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => InputTextboxComponent),
      multi: true
    }
  ]
})

export class InputTextboxComponent implements OnInit, ControlValueAccessor {
  @Input() MaxLength: string;
  @Input() Value: string;
  @Input() type: string;
  @Input() Label: string;
  @Input() PlaceHolder: string;
  @Output() saveValue = new EventEmitter();
  @Output() onStateChange = new EventEmitter();

  disabled: boolean;

  constructor() { }

  ngOnInit() {
  }

  saveValueAction(e) {
    this.saveValue.emit(e.target.value);
  }

  onChange(e) {
    this.Value = e;
  }

  onTouched() {
    this.onStateChange.emit();
  }

  writeValue(value: any) {
    this.Value = value ? value : '';
  }

  registerOnChange(fn: any) { this.onChange = fn; }

  registerOnTouched(fn: any) { this.onTouched = fn; }

  setDisabledState(isDisabled) { this.disabled = isDisabled; }
}

HTML：

<div class="input-wrap">
    <mat-form-field appearance="outline">
        <mat-label>{{Label}}</mat-label>   
        <input matInput 
            [attr.maxlength] = "MaxLength"
            [value]="Value ? Value : ''"
            [placeholder]="PlaceHolder ? PlaceHolder : ''"
            [type]="type ? type: 'text'"
            (input)="onChange($event.target.value)"
        >
    </mat-form-field>
</div>

尝试将此答案与“角度材料”文本框中的自然错误样式结合在一起， Inheriting validation using ControlValueAccessor in Angular

Answer 1

我有同样的问题。我尝试了所有，然后终于可以使用此方法解决：

我在自定义组件上添加了此侦听器。您也可以将其“模糊化”。

@HostListener('focusout', ['$event.target'])
  onFocusout() {
    this.onTouched();
  }

并在设置任何值时也调用onTouched。

 writeValue(value: any) {
    this.onTouched();
    this.Value = value ? value : '';
}

Answer 2

这将从Angular Material创建错误验证

打字稿：

import { Component, OnInit, Input, EventEmitter, Output, forwardRef, Injector } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR, FormControl, NgForm, FormGroupDirective, NgControl } from '@angular/forms';
import { ErrorStateMatcher } from '@angular/material';

export class CustomFieldErrorMatcher implements ErrorStateMatcher {
  constructor(private customControl: FormControl,private errors:any) { }

  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
    return this.customControl && this.customControl.touched &&(this.customControl.invalid || this.errors);
  }
}

@Component({
  selector: 'app-input-textbox',
  templateUrl: './input-textbox.component.html',
  styleUrls: ['./input-textbox.component.scss'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => InputTextboxComponent),
      multi: true
    }
  ]
})

export class InputTextboxComponent implements OnInit, ControlValueAccessor {
  @Input() MaxLength: string;
  @Input() FocusIn: boolean;
  @Input() Width: string;
  @Input() Value: string;
  @Input() type: string;
  @Input() Label: string;
  @Input() Hint: string;
  @Input() PlaceHolder: string;
  @Output() saveValue = new EventEmitter();
  @Output() onStateChange = new EventEmitter();
  @Input() errors: any = null;
  disabled: boolean;
  control: FormControl;

  constructor(public injector: Injector) {}

  ngOnInit(){}

  ngAfterViewInit(): void {
    const ngControl: NgControl = this.injector.get(NgControl, null);
    if (ngControl) {
      setTimeout(() => {
        this.control = ngControl.control as FormControl;
      })
    }
  }

  saveValueAction(e) {
    this.saveValue.emit(e.target.value);
  }

  //control value accessor init
  writeValue(value: any) {
    this.Value = value ? value : '';
  }

  onChange(e) {
    this.Value = e;
  }

  onTouched() {
    this.onStateChange.emit();
  }

  registerOnChange(fn: any) { this.onChange = fn; }

  registerOnTouched(fn: any) { this.onTouched = fn; }

  setDisabledState(isDisabled) { this.disabled = isDisabled; }

  errorMatcher() {
    return new CustomFieldErrorMatcher(this.control,this.errors)
  }

  readonly errorStateMatcher: ErrorStateMatcher = {
    isErrorState: (ctrl: FormControl) => (ctrl && ctrl.invalid)
  };

}

HTML

<div class="input-wrap">
    <mat-form-field>
        <mat-label>{{Label}}</mat-label>   
        <input 
            matInput 
            [attr.maxlength] = "MaxLength"
            [value]="Value ? Value : ''"
            [placeholder]="PlaceHolder ? PlaceHolder : ''"
            [type]="type ? type: 'text'"
            [ngModel]="Value" 
            [errorStateMatcher]="errorMatcher()"

            (input)="onChange($event.target.value)"
            (blur)="onTouched()"
            (change)="saveValueAction($event)"
            (ngModelChange)="Value=$event;onChange($event)"
        >
        <mat-hint>{{Hint}}</mat-hint>
    </mat-form-field>
</div>

Answer 3

Kinda使用您的答案以及您提供的链接来提出此解决方案：


@Component({
  selector: 'app-custom-input',
  templateUrl: './custom-input.component.html',
  styleUrls: ['./custom-input.component.css'],
  providers: [{
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => CustomInputComponent),
    multi: true
  }]
})
export class CustomInputComponent implements OnInit, ControlValueAccessor {
  ...
  _control: NgControl;
  disabled: boolean;

  constructor(private injector: Injector) {
  }

  ngOnInit() {
    this._control = this.injector.get(NgControl);
  }

  ...

custom-input.component.html

<div class="input-wrap">
    <mat-form-field appearance="outline">
        <mat-label>{{Label}}</mat-label>   
        <input matInput
            [formControl]="_control.control" // <== this what makes it work
            [attr.maxlength]="MaxLength"
            [placeholder]="PlaceHolder ? PlaceHolder : ''"
            [type]="type ? type: 'text'"
        >
    </mat-form-field>
</div>

注意：我没有绑定到MatInput的输出（是）。将控件传递给MatInput的formControl指令将为我们处理该指令。

为您制作了example

角材料中具有错误验证的ControlValueAccessor

3 个答案: