directive
The ControlValueAccessor
for writing multi-select control values and listening to multi-select control changes. The value accessor is used by the FormControlDirective
, FormControlName
, and NgModel
directives.
select[multiple][formControlName]
select[multiple][formControl]
select[multiple][ngModel]
Property | Description |
---|---|
@Input()compareWith: (o1: any, o2: any) => boolean |
Write-Only Tracks the option comparison algorithm for tracking identities when checking for changes. |
The follow example shows you how to use a multi-select control with a reactive form.
const countryControl = new FormControl();
<select multiple name="countries" [formControl]="countryControl"> <option *ngFor="let country of countries" [ngValue]="country"> {{ country.name }} </option> </select>
To customize the default option comparison algorithm, <select>
supports compareWith
input. See the SelectControlValueAccessor
for usage.
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Licensed under the Creative Commons Attribution License 4.0.
https://v10.angular.io/api/forms/SelectMultipleControlValueAccessor