Angular Example - Validation (reactive form)

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<hero-form-reactive3></hero-form-reactive3>`
})
export class AppComponent { }


/*
Copyright 2017 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 http://angular.io/license
*/

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from "@angular/forms";

import { AppComponent }           from './app.component';
import { HeroFormReactiveModule } from "./reactive/hero-form-reactive.module";

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    HeroFormReactiveModule
  ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }


/*
Copyright 2017 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 http://angular.io/license
*/

import { Directive, Input, OnChanges, SimpleChanges } from '@angular/core';
import { AbstractControl, NG_VALIDATORS, Validator, ValidatorFn, Validators } from '@angular/forms';

/** A hero's name can't match the given regular expression */
export function forbiddenNameValidator(nameRe: RegExp): ValidatorFn {
  return (control: AbstractControl): {[key: string]: any} => {
    const name = control.value;
    const no = nameRe.test(name);
    return no ? {'forbiddenName': {name}} : null;
  };
}

@Directive({
  selector: '[forbiddenName]',
  providers: [{provide: NG_VALIDATORS, useExisting: ForbiddenValidatorDirective, multi: true}]
})
export class ForbiddenValidatorDirective implements Validator, OnChanges {
  @Input() forbiddenName: string;
  private valFn = Validators.nullValidator;

  ngOnChanges(changes: SimpleChanges): void {
    const change = changes['forbiddenName'];
    if (change) {
      const val: string | RegExp = change.currentValue;
      const re = val instanceof RegExp ? val : new RegExp(val, 'i');
      this.valFn = forbiddenNameValidator(re);
    } else {
      this.valFn = Validators.nullValidator;
    }
  }

  validate(control: AbstractControl): {[key: string]: any} {
    return this.valFn(control);
  }
}



/*
Copyright 2017 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 http://angular.io/license
*/

export class Hero {
  constructor(
    public id: number,
    public name: string,
    public power: string,
    public alterEgo?: string
  ) {  }
}


/*
Copyright 2017 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 http://angular.io/license
*/

import { NgModule }     from '@angular/core';
import { CommonModule } from '@angular/common';

import { ForbiddenValidatorDirective } from './forbidden-name.directive';
import { SubmittedComponent }          from './submitted.component';

@NgModule({
  imports:      [ CommonModule],
  declarations: [ ForbiddenValidatorDirective, SubmittedComponent ],
  exports:      [ ForbiddenValidatorDirective, SubmittedComponent,
                  CommonModule ]
})
export class SharedModule { }


/*
Copyright 2017 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 http://angular.io/license
*/

import { Component, EventEmitter, Input, Output } from '@angular/core';

import { Hero } from './hero';

@Component({
  selector: 'hero-submitted',
  template: `
  <div *ngIf="submitted">
    <h2>You submitted the following:</h2>
    <div class="row">
      <div class="col-xs-3">Name</div>
      <div class="col-xs-9  pull-left">{{ hero.name }}</div>
    </div>
    <div class="row">
      <div class="col-xs-3">Alter Ego</div>
      <div class="col-xs-9 pull-left">{{ hero.alterEgo }}</div>
    </div>
    <div class="row">
      <div class="col-xs-3">Power</div>
      <div class="col-xs-9 pull-left">{{ hero.power }}</div>
    </div>
    <br>
    <button class="btn btn-default" (click)="onClick()">Edit</button>
  </div>`
})
export class SubmittedComponent {
  @Input()  hero: Hero;
  @Input()  submitted = false;
  @Output() submittedChange = new EventEmitter<boolean>();
  onClick() { this.submittedChange.emit(false); }
}


/*
Copyright 2017 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 http://angular.io/license
*/

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';

platformBrowserDynamic().bootstrapModule(AppModule);


/*
Copyright 2017 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 http://angular.io/license
*/

.ng-valid[required], .ng-valid.required  {
  border-left: 5px solid #42A948; /* green */
}

.ng-invalid:not(form)  {
  border-left: 5px solid #a94442; /* red */
}


/*
Copyright 2017 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 http://angular.io/license
*/

/* Master Styles */
h1 {
  color: #369;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 250%;
}
h2, h3 {
  color: #444;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: lighter;
}
body {
  margin: 2em;
}
body, input[text], button {
  color: #888;
  font-family: Cambria, Georgia;
}
a {
  cursor: pointer;
  cursor: hand;
}
button {
  font-family: Arial;
  background-color: #eee;
  border: none;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  cursor: hand;
}
button:hover {
  background-color: #cfd8dc;
}
button:disabled {
  background-color: #eee;
  color: #aaa;
  cursor: auto;
}

/* Navigation link styles */
nav a {
  padding: 5px 10px;
  text-decoration: none;
  margin-right: 10px;
  margin-top: 10px;
  display: inline-block;
  background-color: #eee;
  border-radius: 4px;
}
nav a:visited, a:link {
  color: #607D8B;
}
nav a:hover {
  color: #039be5;
  background-color: #CFD8DC;
}
nav a.active {
  color: #039be5;
}

/* items class */
.items {
  margin: 0 0 2em 0;
  list-style-type: none;
  padding: 0;
  width: 24em;
}
.items li {
  cursor: pointer;
  position: relative;
  left: 0;
  background-color: #EEE;
  margin: .5em;
  padding: .3em 0;
  height: 1.6em;
  border-radius: 4px;
}
.items li:hover {
  color: #607D8B;
  background-color: #DDD;
  left: .1em;
}
.items li.selected {
  background-color: #CFD8DC;
  color: white;
}
.items li.selected:hover {
  background-color: #BBD8DC;
}
.items .text {
  position: relative;
  top: -3px;
}
.items .badge {
  display: inline-block;
  font-size: small;
  color: white;
  padding: 0.8em 0.7em 0 0.7em;
  background-color: #607D8B;
  line-height: 1em;
  position: relative;
  left: -1px;
  top: -4px;
  height: 1.8em;
  margin-right: .8em;
  border-radius: 4px 0 0 4px;
}
/* everywhere else */
* {
  font-family: Arial, Helvetica, sans-serif;
}


/*
Copyright 2017 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 http://angular.io/license
*/

<html>
  <head>
    <title>Hero Form with Validation</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">

    <link rel="stylesheet" href="https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="styles.css">
    <link rel="stylesheet" href="forms.css">

    <!-- Polyfills -->
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>

    <script src="https://unpkg.com/zone.js@0.8.4?main=browser"></script>
    <script src="https://unpkg.com/systemjs@0.19.39/dist/system.src.js"></script>

    <script src="systemjs.config.js"></script>
    <script>
      System.import('main.js').catch(function(err){ console.error(err); });
    </script>
  </head>

  <body>
    <my-app>Loading...</my-app>
  </body>
</html>



<!-- 
Copyright 2017 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 http://angular.io/license
-->

/**
 * WEB ANGULAR VERSION
 * (based on systemjs.config.js in angular.io)
 * System configuration for Angular samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  System.config({
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      // Copy of compiler options in standard tsconfig.json
      "target": "es5",
      "module": "commonjs",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es2015", "dom"],
      "noImplicitAny": true,
      "suppressImplicitAnyIndexErrors": true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    paths: {
      // paths serve as alias
      'npm:': 'https://unpkg.com/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      'app': 'app',

      // angular bundles
      '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
      '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/router/upgrade': 'npm:@angular/router/bundles/router-upgrade.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
      '@angular/upgrade/static': 'npm:@angular/upgrade/bundles/upgrade-static.umd.js',

      // other libraries
      'rxjs':                      'npm:rxjs@5.0.1',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
      'ts':                        'npm:plugin-typescript@5.2.7/lib/plugin.js',
      'typescript':                'npm:typescript@2.2.1/lib/typescript.js',

    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.ts',
        defaultExtension: 'ts',
        meta: {
          './*.ts': {
            loader: 'systemjs-angular-loader.js'
          }
        }
      },
      rxjs: {
        defaultExtension: 'js'
      }
    }
  });

})(this);

/*
Copyright 2016 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 http://angular.io/license
*/

var templateUrlRegex = /templateUrl\s*:(\s*['"`](.*?)['"`]\s*)/gm;
var stylesRegex = /styleUrls *:(\s*\[[^\]]*?\])/g;
var stringRegex = /(['`"])((?:[^\\]\\\1|.)*?)\1/g;

module.exports.translate = function(load){
  if (load.source.indexOf('moduleId') != -1) return load;

  var url = document.createElement('a');
  url.href = load.address;

  var basePathParts = url.pathname.split('/');

  basePathParts.pop();
  var basePath = basePathParts.join('/');

  var baseHref = document.createElement('a');
  baseHref.href = this.baseURL;
  baseHref = baseHref.pathname;

  if (!baseHref.startsWith('/base/')) { // it is not karma
    basePath = basePath.replace(baseHref, '');
  }

  load.source = load.source
    .replace(templateUrlRegex, function(match, quote, url){
      let resolvedUrl = url;

      if (url.startsWith('.')) {
        resolvedUrl = basePath + url.substr(1);
      }

      return 'templateUrl: "' + resolvedUrl + '"';
    })
    .replace(stylesRegex, function(match, relativeUrls) {
      var urls = [];

      while ((match = stringRegex.exec(relativeUrls)) !== null) {
        if (match[2].startsWith('.')) {
          urls.push('"' + basePath + match[2].substr(1) + '"');
        } else {
          urls.push('"' + match[2] + '"');
        }
      }

      return "styleUrls: [" + urls.join(', ') + "]";
    });

  return load;
};

export namespace Messages {
  export const required = "{name} is required.";
  export const minlength = "{name} is must be at least {min} characters long.";
  export const maxlength = "{name} cannot be more than {max} characters long.";
  export const forbiddenName = "Someone named \"{forbiddenName}\" cannot be a hero.";
}

import { NgForm, FormGroup } from "@angular/forms";
import { Messages } from "./messages";

interface Config {
  [key: string]: {
    [key: string]: { [key: string]: string }
  };
}

export class Validator {
  config: Config;
  formErrors: {};

  constructor(config: Config) {
    this.config = config;
  }

  validate(ngForm: NgForm | FormGroup) {
    this.formErrors = {};
    Object.keys(ngForm.controls).forEach((ck) => {
      this.formErrors[ck] = "";
      let control = null;
      if((<FormGroup>ngForm).get) {
        control = (<FormGroup>ngForm).get(ck);
      } else {
        control = (<NgForm>ngForm).form.get(ck);
      }

      if(control && control.dirty && !control.valid) {
        Object.keys(control.errors).forEach((ek) => {
          this.formErrors[ck] += this.replacedToArgs(Messages[ek], this.config[ck][ek]) + " ";
        });
      }
    });
    return this.formErrors;
  }

  private replacedToArgs(message: string, args: { [key: string]: string }) {
    Object.keys(args).forEach((arg) => {
      message = message.replace(new RegExp(`{${arg}}`, "g"), args[arg]);
    });
    return message;
  }
}

import { NgModule } from "@angular/core";
import { ReactiveFormsModule } from "@angular/forms";

import { SharedModule } from "../shared/shared.module";
import { HeroFormReactiveComponent } from "./hero-form-reactive.component";

@NgModule({
  imports: [SharedModule, ReactiveFormsModule],
  declarations: [HeroFormReactiveComponent],
  exports: [HeroFormReactiveComponent]
})
export class HeroFormReactiveModule { }

/* tslint:disable: member-ordering forin */
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";
import { Validator } from "../shared/validator";

@Component({
  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;
  }

  // Reset the form with a new hero AND restore 'pristine' class state
  // by toggling 'active' flag which causes the form
  // to be removed/re-added in a tick via NgIf
  // TODO: Workaround until NgForm has a reset method (#6822)
  active = true;

  config = {
    "name": {
      required: { name: "Name" },
      minlength: { name: "Name", min: "4" },
      maxlength: { name: "Name", max: "24" },
      forbiddenName: { forbiddenName: "Bob" }
    },
    "power": {
      required: { name: "Power" }
    }
  };
  
  validator:Validator;

  addHero() {
    this.hero = new Hero(42, "", "");
    this.buildForm();

    this.active = false;
    setTimeout(() => this.active = true, 0);
  }

  heroForm: FormGroup;
  constructor(private fb: FormBuilder) {
    this.validator = new Validator(this.config);
  }

  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; }
    this.formErrors = this.validator.validate(this.heroForm);
  }

  formErrors = {};
}

<div class="container">
  <div [hidden]="submitted">
    <h1>Hero Form 3 (Reactive)</h1>
    <form [formGroup]="heroForm"  *ngIf="active"  (ngSubmit)="onSubmit()">
      <div class="form-group">
        <label for="name">Name</label>

        <input type="text" id="name" class="form-control"
               formControlName="name" required >

        <div *ngIf="formErrors.name" class="alert alert-danger">
          {{ formErrors.name }}
        </div>
      </div>

      <div class="form-group">
        <label for="alterEgo">Alter Ego</label>
        <input type="text" id="alterEgo" class="form-control"
            formControlName="alterEgo"  >
      </div>

      <div class="form-group">
        <label for="power">Hero Power</label>
        <select id="power" class="form-control"
            formControlName="power" required >
          <option value=""></option>
          <option *ngFor="let p of powers" [value]="p">{{p}}</option>
        </select>

        <div *ngIf="formErrors.power" class="alert alert-danger">
          {{ formErrors.power }}
        </div>
      </div>

      <button type="submit" class="btn btn-default"
             [disabled]="!heroForm.valid">Submit</button>
      <button type="button" class="btn btn-default"
             (click)="addHero()">New Hero</button>
    </form>
  </div>

  <hero-submitted [hero]="hero" [(submitted)]="submitted"></hero-submitted>
</div>