如何在降级的Angular组件上实现ControlValueAccessor

Question

我有一个实现ControlValueAccessor的Angular组件，但是从未使用ngModel的初始值调用writeValue方法。

模板：

<my-comp [(ngModel)]="$ctrl.activeUser"></my-comp>

该组件通过以下方式降级为AngularJS：

.directive('myComp', downgradeComponent({
  component: MyComp,
  inputs: [],
  outputs: [],
}));

我尝试将ngModel添加到inputs和outputs但无法正常工作。

Answer 1

您应该使用ng-model属性而不是[(ngModel)] ，如下所示： <my-comp ng-model="$ctrl.activeUser"></my-comp>

从角度文档：

 * 3. `ng-model` is controlled by AngularJS and communicates with the downgraded Angular component
 *    by way of the `ControlValueAccessor` interface from @angular/forms. Only components that
 *    implement this interface are eligible.
 *
 * ## Supported Features
 *
 * - Bindings:
 *   - Attribute: `<comp name="World">`
 *   - Interpolation:  `<comp greeting="Hello {{name}}!">`
 *   - Expression:  `<comp [name]="username">`
 *   - Event:  `<comp (close)="doSomething()">`
 *   - ng-model: `<comp ng-model="name">`