Created
October 25, 2016 21:21
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| import { Component, OnInit } from '@angular/core'; | |
| import { FormGroup, FormBuilder, Validators } from '@angular/forms'; | |
| import { Hero } from '../shared/hero'; | |
| import { forbiddenNameValidator } from '../shared/forbidden-name.directive'; | |
| @Component({ | |
| moduleId: module.id, | |
| selector: 'hero-form-reactive3', | |
| templateUrl: 'hero-form-reactive.component.html' | |
| }) | |
| export class HeroFormReactiveComponent implements OnInit { | |
| powers = ['Really Smart', 'Super Flexible', 'Weather Changer']; | |
| hero = new Hero(18, 'Dr. WhatIsHisName', this.powers[0], 'Dr. What'); | |
| submitted = false; | |
| onSubmit() { | |
| this.submitted = true; | |
| this.hero = this.heroForm.value; | |
| } | |
| addHero() { | |
| this.hero = new Hero(42, '', ''); | |
| this.buildForm(); | |
| this.active = false; | |
| setTimeout(() => this.active = true, 0); | |
| } | |
| heroForm: FormGroup; | |
| constructor(private fb: FormBuilder) { } | |
| ngOnInit(): void { | |
| this.buildForm(); | |
| } | |
| buildForm(): void { | |
| this.heroForm = this.fb.group({ | |
| 'name': [this.hero.name, [ | |
| Validators.required, | |
| Validators.minLength(4), | |
| Validators.maxLength(24), | |
| forbiddenNameValidator(/bob/i) | |
| ] | |
| ], | |
| 'alterEgo': [this.hero.alterEgo], | |
| 'power': [this.hero.power, Validators.required] | |
| }); | |
| this.heroForm.valueChanges | |
| .subscribe(data => this.onValueChanged(data)); | |
| this.onValueChanged(); // (re)set validation messages now | |
| } | |
| onValueChanged(data?: any) { | |
| if (!this.heroForm) { return; } | |
| const form = this.heroForm; | |
| for (const field in this.formErrors) { | |
| // clear previous error message (if any) | |
| this.formErrors[field] = ''; | |
| const control = form.get(field); | |
| if (control && control.dirty && !control.valid) { | |
| const messages = this.validationMessages[field]; | |
| for (const key in control.errors) { | |
| this.formErrors[field] += messages[key] + ' '; | |
| } | |
| } | |
| } | |
| } | |
| formErrors = { | |
| 'name': '', | |
| 'power': '' | |
| }; | |
| validationMessages = { | |
| 'name': { | |
| 'required': 'Name is required.', | |
| 'minlength': 'Name must be at least 4 characters long.', | |
| 'maxlength': 'Name cannot be more than 24 characters long.', | |
| 'forbiddenName': 'Someone named "Bob" cannot be a hero.' | |
| }, | |
| 'power': { | |
| 'required': 'Power is required.' | |
| } | |
| }; | |
| } |
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