88 lines
2.8 KiB
TypeScript
88 lines
2.8 KiB
TypeScript
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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {EventEmitter} from '@angular/core';
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import {AbstractControl, AsyncValidatorFn, ValidationErrors} from '@angular/forms';
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import {of} from 'rxjs';
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function createValidationPromise(
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result: ValidationErrors|null, timeout: number): Promise<ValidationErrors|null> {
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return new Promise(resolve => {
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if (timeout == 0) {
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resolve(result);
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} else {
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setTimeout(() => {
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resolve(result);
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}, timeout);
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}
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});
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}
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/**
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* Returns a promise-based async validator that emits, after a delay, either:
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* - an error `{async: true}` if the control value does not match the expected value
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* - or null, otherwise
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* The delay is either:
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* - defined in `timeouts` parameter, as the association to the control value
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* - or 0ms otherwise
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*
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* @param expected The expected control value
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* @param timeouts A dictionary associating a control value to when the validation will trigger for
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* that value
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*/
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export function asyncValidator(expected: string, timeouts = {}): AsyncValidatorFn {
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return (control: AbstractControl) => {
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const timeout = (timeouts as any)[control.value] ?? 0;
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const result = control.value != expected ? {async: true} : null;
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return createValidationPromise(result, timeout);
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};
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}
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/**
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* Returns an async validator that emits null or a custom error after a specified delay.
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* If the delay is set to 0ms, the validator emits synchronously.
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*
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* @param timeout Indicates when the validator will emit
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* @param shouldFail When true, a validation error is emitted, otherwise null is emitted
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* @param customError When supplied, overrides the default error `{async: true}`
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*/
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export function simpleAsyncValidator({
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timeout = 0,
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shouldFail,
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customError =
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{
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async: true
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}
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}: {timeout?: number, shouldFail: boolean, customError?: any}): AsyncValidatorFn {
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const result = shouldFail ? customError : null;
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return (c: AbstractControl) =>
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timeout === 0 ? of(result) : createValidationPromise(result, timeout);
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}
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/**
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* Returns the asynchronous validation state of each provided control
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* @param controls A collection of controls
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*/
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export function currentStateOf(controls: AbstractControl[]):
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{errors: any; pending: boolean; status: string;}[] {
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return controls.map(c => ({errors: c.errors, pending: c.pending, status: c.status}));
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}
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/**
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* Returns an `EventEmitter` emitting the default error `{'async': true}`
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*
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* @param c The control instance
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*/
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export function asyncValidatorReturningObservable(c: AbstractControl): EventEmitter<any> {
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const e = new EventEmitter();
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Promise.resolve(null).then(() => {
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e.emit({'async': true});
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});
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return e;
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}
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