@angular/material
Version:
Angular Material
45 lines • 4.65 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Attribute, Directive, ElementRef, InjectionToken, Input } from '@angular/core';
let nextUniqueId = 0;
/**
* Injection token that can be used to reference instances of `MatError`. It serves as
* alternative token to the actual `MatError` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
export const MAT_ERROR = new InjectionToken('MatError');
/** Single error message to be shown underneath the form field. */
export class MatError {
constructor(ariaLive, elementRef) {
this.id = `mat-error-${nextUniqueId++}`;
// If no aria-live value is set add 'polite' as a default. This is preferred over setting
// role='alert' so that screen readers do not interrupt the current task to read this aloud.
if (!ariaLive) {
elementRef.nativeElement.setAttribute('aria-live', 'polite');
}
}
}
MatError.decorators = [
{ type: Directive, args: [{
selector: 'mat-error',
host: {
'class': 'mat-error',
'[attr.id]': 'id',
'aria-atomic': 'true',
},
providers: [{ provide: MAT_ERROR, useExisting: MatError }],
},] }
];
MatError.ctorParameters = () => [
{ type: String, decorators: [{ type: Attribute, args: ['aria-live',] }] },
{ type: ElementRef }
];
MatError.propDecorators = {
id: [{ type: Input }]
};
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