DefaultValueAccessor
The default ControlValueAccessor for writing a value and listening to changes on input elements. The accessor is used by the FormControlDirective, FormControlName, and NgModel directives.
Exported from
选择器
input:not([type=checkbox])[formControlName]textarea[formControlName]input:not([type=checkbox])[formControl]textarea[formControl]input:not([type=checkbox])[ngModel]textarea[ngModel][ngDefaultControl]
说明
使用默认值访问器
Using the default value accessor
以下示例演示了如何使用输入元素激活默认值访问器（在这种情况下为文本字段）。
The following example shows how to use an input element that activates the default value accessor (in this case, a text field).
const firstNameControl = new FormControl();
<input type="text" [formControl]="firstNameControl">
默认情况下，此值访问器用于 <input type="text"> 和 <textarea> 元素，但你也可以将其用于具有类似行为且不需要特殊处理的自定义组件。为了将默认值访问器附加到自定义元素，请添加 ngDefaultControl 属性，如下所示。
This value accessor is used by default for <input type="text"> and <textarea> elements, but you could also use it for custom components that have similar behavior and do not require special processing. In order to attach the default value accessor to a custom element, add the ngDefaultControl attribute as shown below.
<custom-input-component ngDefaultControl [(ngModel)]="value"></custom-input-component>
