/
validators.ts
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/
validators.ts
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/**
* @license
* Copyright Google Inc. 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 {InjectionToken, ɵisObservable as isObservable, ɵisPromise as isPromise, ɵmerge as merge} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {forkJoin} from 'rxjs/observable/forkJoin';
import {fromPromise} from 'rxjs/observable/fromPromise';
import {map} from 'rxjs/operator/map';
import {AsyncValidatorFn, ValidationErrors, Validator, ValidatorFn} from './directives/validators';
import {AbstractControl, FormControl} from './model';
function isEmptyInputValue(value: any): boolean {
// we don't check for string here so it also works with arrays
return value == null || value.length === 0;
}
/**
* Providers for validators to be used for {@link FormControl}s in a form.
*
* Provide this using `multi: true` to add validators.
*
* ### Example
*
* {@example core/forms/ts/ng_validators/ng_validators.ts region='ng_validators'}
* @stable
*/
export const NG_VALIDATORS = new InjectionToken<Array<Validator|Function>>('NgValidators');
/**
* Providers for asynchronous validators to be used for {@link FormControl}s
* in a form.
*
* Provide this using `multi: true` to add validators.
*
* See {@link NG_VALIDATORS} for more details.
*
* @stable
*/
export const NG_ASYNC_VALIDATORS =
new InjectionToken<Array<Validator|Function>>('NgAsyncValidators');
const EMAIL_REGEXP =
/^(?=.{1,254}$)(?=.{1,64}@)[-!#$%&'*+/0-9=?A-Z^_`a-z{|}~]+(\.[-!#$%&'*+/0-9=?A-Z^_`a-z{|}~]+)*@[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?(\.[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9])?)*$/;
/**
* Provides a set of validators used by form controls.
*
* A validator is a function that processes a {@link FormControl} or collection of
* controls and returns a map of errors. A null map means that validation has passed.
*
* ### Example
*
* ```typescript
* var loginControl = new FormControl("", Validators.required)
* ```
*
* @stable
*/
export class Validators {
/**
* Validator that requires controls to have a non-empty value.
*/
static required(control: AbstractControl): ValidationErrors|null {
return isEmptyInputValue(control.value) ? {'required': true} : null;
}
/**
* Validator that requires control value to be true.
*/
static requiredTrue(control: AbstractControl): ValidationErrors|null {
return control.value === true ? null : {'required': true};
}
/**
* Validator that performs email validation.
*/
static email(control: AbstractControl): ValidationErrors|null {
return EMAIL_REGEXP.test(control.value) ? null : {'email': true};
}
/**
* Validator that requires controls to have a value of a minimum length.
*/
static minLength(minLength: number): ValidatorFn {
return (control: AbstractControl): ValidationErrors | null => {
if (isEmptyInputValue(control.value)) {
return null; // don't validate empty values to allow optional controls
}
const length: number = control.value ? control.value.length : 0;
return length < minLength ?
{'minlength': {'requiredLength': minLength, 'actualLength': length}} :
null;
};
}
/**
* Validator that requires controls to have a value of a maximum length.
*/
static maxLength(maxLength: number): ValidatorFn {
return (control: AbstractControl): ValidationErrors | null => {
const length: number = control.value ? control.value.length : 0;
return length > maxLength ?
{'maxlength': {'requiredLength': maxLength, 'actualLength': length}} :
null;
};
}
/**
* Validator that requires a control to match a regex to its value.
*/
static pattern(pattern: string|RegExp): ValidatorFn {
if (!pattern) return Validators.nullValidator;
let regex: RegExp;
let regexStr: string;
if (typeof pattern === 'string') {
regexStr = `^${pattern}$`;
regex = new RegExp(regexStr);
} else {
regexStr = pattern.toString();
regex = pattern;
}
return (control: AbstractControl): ValidationErrors | null => {
if (isEmptyInputValue(control.value)) {
return null; // don't validate empty values to allow optional controls
}
const value: string = control.value;
return regex.test(value) ? null :
{'pattern': {'requiredPattern': regexStr, 'actualValue': value}};
};
}
/**
* No-op validator.
*/
static nullValidator(c: AbstractControl): ValidationErrors|null { return null; }
/**
* Compose multiple validators into a single function that returns the union
* of the individual error maps.
*/
static compose(validators: ValidatorFn[]): ValidatorFn {
if (!validators) return null;
const presentValidators = validators.filter(isPresent);
if (presentValidators.length == 0) return null;
return function(control: AbstractControl) {
return _mergeErrors(_executeValidators(control, presentValidators));
};
}
static composeAsync(validators: AsyncValidatorFn[]): AsyncValidatorFn {
if (!validators) return null;
const presentValidators = validators.filter(isPresent);
if (presentValidators.length == 0) return null;
return function(control: AbstractControl) {
const observables = _executeAsyncValidators(control, presentValidators).map(toObservable);
return map.call(forkJoin(observables), _mergeErrors);
};
}
}
function isPresent(o: any): boolean {
return o != null;
}
export function toObservable(r: any): Observable<any> {
const obs = isPromise(r) ? fromPromise(r) : r;
if (!(isObservable(obs))) {
throw new Error(`Expected validator to return Promise or Observable.`);
}
return obs;
}
function _executeValidators(control: AbstractControl, validators: ValidatorFn[]): any[] {
return validators.map(v => v(control));
}
function _executeAsyncValidators(control: AbstractControl, validators: AsyncValidatorFn[]): any[] {
return validators.map(v => v(control));
}
function _mergeErrors(arrayOfErrors: ValidationErrors[]): ValidationErrors|null {
const res: {[key: string]: any} =
arrayOfErrors.reduce((res: ValidationErrors | null, errors: ValidationErrors | null) => {
return errors != null ? merge(res, errors) : res;
}, {});
return Object.keys(res).length === 0 ? null : res;
}