如何进一步封装一个表单字段组件？

Question

现在我在很多地方使用ngx-daterangepicker-material和下面的重复代码，我想封装成独立的组件以便重用。

<div class="fx-date-range-container">
  <span class="summary">Summary</span>
  <input class="fx-date-range" type="text" matInput
         ngxDaterangepickerMd
         [locale]="{applyLabel: 'ok', format: 'MM-DD-YYYY'}"
         [drops]="'down'"
         [opens]="'right'"
         [ranges]="ranges"
         [showCustomRangeLabel]="false"
         [alwaysShowCalendars]="true"
         [keepCalendarOpeningWithRange]="true"
         [showCancel]="true"
         autocomplete="off"
         [(ngModel)]="selectedDateRange"
         (change)="getCampaignFXASummary()"
         name="daterange"/>
  <mat-icon class="icon-date-range" matSuffix>keyboard_arrow_down</mat-icon>
</div>

组件名称为fx-date-range-picker。这是一个演示，我的问题是如何设置ngModel并将值传递给fx-date-range-picker组件。

也许我应该实现writeValue函数，但不确定如何编写。

https://ngx-daterangepicker-material-demo.stackblitz.io

Answer 1

您需要实现ControlValueAccessor

请参阅有关ControlValueAccessor的angular.io文档

要实现的函数应如下所示：

  export class [yourClass] implements ControlValueAccessor {      
  protected onChange: (value: any) => void = NOOP;
  protected internalValue: number;

  get value(): number {
    return this.internalValue;
  }

  set value(value: number) {
    if (value !== this.internalValue) {
      this.internalValue = value;
      this.onChange(value);
    }
  }

  writeValue(value) {
    this.value = value;
}
registerOnChange(fn) { this.onChange = fn;  }
registerOnTouched(fn) {  }

请看下面的帖子来解释它：https://blog.angularindepth.com/never-again-be-confused-when-implementing-controlvalueaccessor-in-angular-forms-93b9eee9ee83

祝好运!