refactor(form): misc minor refactoring

Closes #3951

modules/angular2/src/core/forms/directives/checkbox_value_accessor.ts

@@ -40,7 +40,7 @@ export class CheckboxControlValueAccessor implements ControlValueAccessor {
     cd.valueAccessor = this;
   }
 
-  writeValue(value: any) { setProperty(this._renderer, this._elementRef, "checked", value); }
+  writeValue(value: any): void { setProperty(this._renderer, this._elementRef, "checked", value); }
 
   get ngClassUntouched(): boolean {
     return isPresent(this._cd.control) ? this._cd.control.untouched : false;

modules/angular2/src/core/forms/directives/control_container.ts

@@ -2,7 +2,7 @@ import {Form} from './form_interface';
 import {AbstractControlDirective} from './abstract_control_directive';
 
 /**
- * A directive that contains a group of [NgControl].
+ * A directive that contains multiple {@link NgControl}.
  *
  * Only used by the forms module.
  */

modules/angular2/src/core/forms/directives/default_value_accessor.ts

@@ -41,9 +41,7 @@ export class DefaultValueAccessor implements ControlValueAccessor {
     cd.valueAccessor = this;
   }
 
-  writeValue(value: any) {
+  writeValue(value: any): void {
-    // both this.value and setProperty are required at the moment
-    // remove when a proper imperative API is provided
     var normalizedValue = isBlank(value) ? '' : value;
     setProperty(this._renderer, this._elementRef, 'value', normalizedValue);
   }

modules/angular2/src/core/forms/directives/ng_control_group.ts

@@ -42,7 +42,8 @@ const controlGroupBinding =
  *      `})
  * class SignupComp {
  *  onSignUp(value) {
- *    // value === {personal: {name: 'some name'},
+ *    // value === {
+ *    //  personal: {name: 'some name'},
  *    //  credentials: {login: 'some login', password: 'some password'}}
  *  }
  * }
@@ -63,9 +64,9 @@ export class NgControlGroup extends ControlContainer implements OnInit,
     this._parent = _parent;
   }
 
-  onInit() { this.formDirective.addControlGroup(this); }
+  onInit(): void { this.formDirective.addControlGroup(this); }
 
-  onDestroy() { this.formDirective.removeControlGroup(this); }
+  onDestroy(): void { this.formDirective.removeControlGroup(this); }
 
   get control(): ControlGroup { return this.formDirective.getControlGroup(this); }
 

modules/angular2/src/core/forms/directives/ng_control_name.ts

@@ -24,24 +24,23 @@ const controlNameBinding =
  *
  * In this example, we create the login and password controls.
  * We can work with each control separately: check its validity, get its value, listen to its
- changes.
+ * changes.
  *
  *  ```
  * @Component({selector: "login-comp"})
  * @View({
  *      directives: [FORM_DIRECTIVES],
  *      template: `
- *              <form #f="form" (submit)='onLogIn(f.value)'>
+ *        <form #f="form" (submit)='onLogIn(f.value)'>
- *                Login <input type='text' ng-control='login' #l="form">
+ *          Login <input type='text' ng-control='login' #l="form">
- *                <div *ng-if="!l.valid">Login is invalid</div>
+ *          <div *ng-if="!l.valid">Login is invalid</div>
  *
- *                Password <input type='password' ng-control='password'>
+ *          Password <input type='password' ng-control='password'>
-
+ *          <button type='submit'>Log in!</button>
- *                <button type='submit'>Log in!</button>
+ *        </form>
- *              </form>
  *      `})
  * class LoginComp {
- *  onLogIn(value) {
+ *  onLogIn(value): void {
  *    // value === {login: 'some login', password: 'some password'}
  *  }
  * }
@@ -54,17 +53,17 @@ const controlNameBinding =
  * @View({
  *      directives: [FORM_DIRECTIVES],
  *      template: `
- *              <form (submit)='onLogIn()'>
+ *        <form (submit)='onLogIn()'>
- *                Login <input type='text' ng-control='login' [(ng-model)]="credentials.login">
+ *          Login <input type='text' ng-control='login' [(ng-model)]="credentials.login">
- *                Password <input type='password' ng-control='password'
+ *          Password <input type='password' ng-control='password'
- [(ng-model)]="credentials.password">
+ *                          [(ng-model)]="credentials.password">
- *                <button type='submit'>Log in!</button>
+ *          <button type='submit'>Log in!</button>
- *              </form>
+ *        </form>
  *      `})
  * class LoginComp {
  *  credentials: {login:string, password:string};
  *
- *  onLogIn() {
+ *  onLogIn(): void {
  *    // this.credentials.login === "some login"
  *    // this.credentials.password === "some password"
  *  }
@@ -94,18 +93,18 @@ export class NgControlName extends NgControl implements OnChanges,
     this.validators = validators;
   }
 
-  onChanges(c: StringMap<string, any>) {
+  onChanges(changes: StringMap<string, any>) {
     if (!this._added) {
       this.formDirective.addControl(this);
       this._added = true;
     }
-    if (isPropertyUpdated(c, this.viewModel)) {
+    if (isPropertyUpdated(changes, this.viewModel)) {
       this.viewModel = this.model;
       this.formDirective.updateModel(this, this.model);
     }
   }
 
-  onDestroy() { this.formDirective.removeControl(this); }
+  onDestroy(): void { this.formDirective.removeControl(this); }
 
   viewToModelUpdate(newValue: any): void {
     this.viewModel = newValue;

modules/angular2/src/core/forms/directives/ng_form.ts

@@ -42,8 +42,9 @@ const formDirectiveBinding =
  *              </form>
  *      `})
  * class SignupComp {
- *  onSignUp(value) {
+ *  onSignUp(value): void {
- *    // value === {personal: {name: 'some name'},
+ *    // value === {
+ *    //  personal: {name: 'some name'},
  *    //  credentials: {login: 'some login', password: 'some password'}}
  *  }
  * }
@@ -60,14 +61,9 @@ const formDirectiveBinding =
   exportAs: 'form'
 })
 export class NgForm extends ControlContainer implements Form {
-  form: ControlGroup;
+  form: ControlGroup = new ControlGroup({});
   ngSubmit = new EventEmitter();
 
-  constructor() {
-    super();
-    this.form = new ControlGroup({});
-  }
-
   get formDirective(): Form { return this; }
 
   get control(): ControlGroup { return this.form; }
@@ -79,10 +75,10 @@ export class NgForm extends ControlContainer implements Form {
   addControl(dir: NgControl): void {
     this._later(_ => {
       var container = this._findContainer(dir.path);
-      var c = new Control();
+      var ctrl = new Control();
-      setUpControl(c, dir);
+      setUpControl(ctrl, dir);
-      container.addControl(dir.name, c);
+      container.addControl(dir.name, ctrl);
-      c.updateValidity();
+      ctrl.updateValidity();
     });
   }
 
@@ -101,9 +97,9 @@ export class NgForm extends ControlContainer implements Form {
   addControlGroup(dir: NgControlGroup): void {
     this._later(_ => {
       var container = this._findContainer(dir.path);
-      var c = new ControlGroup({});
+      var group = new ControlGroup({});
-      container.addControl(dir.name, c);
+      container.addControl(dir.name, group);
-      c.updateValidity();
+      group.updateValidity();
     });
   }
 
@@ -123,8 +119,8 @@ export class NgForm extends ControlContainer implements Form {
 
   updateModel(dir: NgControl, value: any): void {
     this._later(_ => {
-      var c = <Control>this.form.find(dir.path);
+      var ctrl = <Control>this.form.find(dir.path);
-      c.updateValue(value);
+      ctrl.updateValue(value);
     });
   }
 
@@ -138,9 +134,5 @@ export class NgForm extends ControlContainer implements Form {
     return ListWrapper.isEmpty(path) ? this.form : <ControlGroup>this.form.find(path);
   }
 
-  _later(fn) {
+  _later(fn): void { PromiseWrapper.then(PromiseWrapper.resolve(null), fn, (_) => {}); }
-    var c: PromiseCompleter<any> = PromiseWrapper.completer();
-    PromiseWrapper.then(c.promise, fn, (_) => {});
-    c.resolve(null);
-  }
 }

modules/angular2/src/core/forms/directives/ng_form_control.ts

@@ -17,10 +17,8 @@ const formControlBinding =
  * # Example
  *
  * In this example, we bind the control to an input element. When the value of the input element
- * changes, the value of
+ * changes, the value of the control will reflect that change. Likewise, if the value of the
- * the control will reflect that change. Likewise, if the value of the control changes, the input
+ * control changes, the input element reflects that change.
- * element reflects that
- * change.
  *
  *  ```
  * @Component({selector: "login-comp"})
@@ -29,16 +27,12 @@ const formControlBinding =
  *      template: "<input type='text' [ng-form-control]='loginControl'>"
  *      })
  * class LoginComp {
- *  loginControl:Control;
+ *  loginControl: Control = new Control('');;
- *
- *  constructor() {
- *    this.loginControl = new Control('');
- *  }
  * }
  *
  *  ```
  *
- * We can also use ng-model to bind a domain model to the form.
+ * We can also use `ng-model` to bind a domain model to the form.
  *
  *  ```
  * @Component({selector: "login-comp"})
@@ -47,12 +41,8 @@ const formControlBinding =
  *      template: "<input type='text' [ng-form-control]='loginControl' [(ng-model)]='login'>"
  *      })
  * class LoginComp {
- *  loginControl:Control;
+ *  loginControl: Control = new Control('');
  *  login:string;
- *
- *  constructor() {
- *    this.loginControl = new Control('');
- *  }
  * }
  *  ```
  */
@@ -76,13 +66,13 @@ export class NgFormControl extends NgControl implements OnChanges {
     this.validators = validators;
   }
 
-  onChanges(c: StringMap<string, any>) {
+  onChanges(changes: StringMap<string, any>): void {
     if (!this._added) {
       setUpControl(this.form, this);
       this.form.updateValidity();
       this._added = true;
     }
-    if (isPropertyUpdated(c, this.viewModel)) {
+    if (isPropertyUpdated(changes, this.viewModel)) {
       this.form.updateValue(this.model);
       this.viewModel = this.model;
     }

modules/angular2/src/core/forms/directives/ng_form_model.ts

@@ -21,21 +21,21 @@ const formDirectiveBinding =
  * # Example
  *
  * In this example, we bind the control group to the form element, and we bind the login and
- * password controls to the
+ * password controls to the login and password elements.
- * login and password elements.
  *
  *  ```
  * @Component({selector: "login-comp"})
  * @View({
  *      directives: [FORM_DIRECTIVES],
- *      template: "<form [ng-form-model]='loginForm'>" +
+ *      template: `
- *              "Login <input type='text' ng-control='login'>" +
+ *        <form [ng-form-model]='loginForm'>
- *              "Password <input type='password' ng-control='password'>" +
+ *          Login <input type='text' ng-control='login'>
- *              "<button (click)="onLogin()">Login</button>" +
+ *          Password <input type='password' ng-control='password'>
- *              "</form>"
+ *          <button (click)="onLogin()">Login</button>
+ *        </form>`
  *      })
  * class LoginComp {
- *  loginForm:ControlGroup;
+ *  loginForm: ControlGroup;
  *
  *  constructor() {
  *    this.loginForm = new ControlGroup({
@@ -44,7 +44,7 @@ const formDirectiveBinding =
  *    });
  *  }
  *
- *  onLogin() {
+ *  onLogin(): void {
  *    // this.loginForm.value
  *  }
  * }
@@ -57,15 +57,17 @@ const formDirectiveBinding =
  * @Component({selector: "login-comp"})
  * @View({
  *      directives: [FORM_DIRECTIVES],
- *      template: "<form [ng-form-model]='loginForm'>" +
+ *      template: `
- *              "Login <input type='text' ng-control='login' [(ng-model)]='login'>" +
+ *        <form [ng-form-model]='loginForm'>
- *              "Password <input type='password' ng-control='password' [(ng-model)]='password'>" +
+ *          Login <input type='text' ng-control='login' [(ng-model)]='credentials.login'>
- *              "<button (click)="onLogin()">Login</button>" +
+ *          Password <input type='password' ng-control='password'
- *              "</form>"
+ *                          [(ng-model)]='credentials.password'>
+ *          <button (click)="onLogin()">Login</button>
+ *        </form>`
  *      })
  * class LoginComp {
- *  credentials:{login:string, password:string}
+ *  credentials: {login: string, password: string};
- *  loginForm:ControlGroup;
+ *  loginForm: ControlGroup;
  *
  *  constructor() {
  *    this.loginForm = new ControlGroup({
@@ -74,7 +76,7 @@ const formDirectiveBinding =
  *    });
  *  }
  *
- *  onLogin() {
+ *  onLogin(): void {
  *    // this.credentials.login === 'some login'
  *    // this.credentials.password === 'some password'
  *  }
@@ -85,9 +87,7 @@ const formDirectiveBinding =
   selector: '[ng-form-model]',
   bindings: [formDirectiveBinding],
   properties: ['form: ng-form-model'],
-  host: {
+  host: {'(submit)': 'onSubmit()'},
-    '(submit)': 'onSubmit()',
-  },
   events: ['ngSubmit'],
   exportAs: 'form'
 })
@@ -97,7 +97,7 @@ export class NgFormModel extends ControlContainer implements Form,
   directives: NgControl[] = [];
   ngSubmit = new EventEmitter();
 
-  onChanges(_) { this._updateDomValue(); }
+  onChanges(_): void { this._updateDomValue(); }
 
   get formDirective(): Form { return this; }
 
@@ -106,9 +106,9 @@ export class NgFormModel extends ControlContainer implements Form,
   get path(): string[] { return []; }
 
   addControl(dir: NgControl): void {
-    var c: any = this.form.find(dir.path);
+    var ctrl: any = this.form.find(dir.path);
-    setUpControl(c, dir);
+    setUpControl(ctrl, dir);
-    c.updateValidity();
+    ctrl.updateValidity();
     this.directives.push(dir);
   }
 
@@ -125,8 +125,8 @@ export class NgFormModel extends ControlContainer implements Form,
   }
 
   updateModel(dir: NgControl, value: any): void {
-    var c  = <Control>this.form.find(dir.path);
+    var ctrl  = <Control>this.form.find(dir.path);
-    c.updateValue(value);
+    ctrl.updateValue(value);
   }
 
   onSubmit(): boolean {
@@ -136,8 +136,8 @@ export class NgFormModel extends ControlContainer implements Form,
 
   _updateDomValue() {
     ListWrapper.forEach(this.directives, dir => {
-      var c: any = this.form.find(dir.path);
+      var ctrl: any = this.form.find(dir.path);
-      dir.valueAccessor.writeValue(c.value);
+      dir.valueAccessor.writeValue(ctrl.value);
     });
   }
 }

modules/angular2/src/core/forms/directives/ng_model.ts

@@ -20,9 +20,8 @@ const formControlBinding = CONST_EXPR(new Binding(NgControl, {toAlias: forwardRe
  * @Component({selector: "search-comp"})
  * @View({
  *      directives: [FORM_DIRECTIVES],
- *      template: `
+ *      template: `<input type='text' [(ng-model)]="searchQuery">`
-              <input type='text' [(ng-model)]="searchQuery">
+ *      })
- *      `})
  * class SearchComp {
  *  searchQuery: string;
  * }
@@ -48,14 +47,14 @@ export class NgModel extends NgControl implements OnChanges {
     this.validators = validators;
   }
 
-  onChanges(c: StringMap<string, any>) {
+  onChanges(changes: StringMap<string, any>) {
     if (!this._added) {
       setUpControl(this._control, this);
       this._control.updateValidity();
       this._added = true;
     }
 
-    if (isPropertyUpdated(c, this.viewModel)) {
+    if (isPropertyUpdated(changes, this.viewModel)) {
       this._control.updateValue(this.model);
       this.viewModel = this.model;
     }

modules/angular2/src/core/forms/directives/select_control_value_accessor.ts

@@ -9,7 +9,7 @@ import {isPresent} from 'angular2/src/core/facade/lang';
 import {setProperty} from './shared';
 
 /**
- * Marks <option> as dynamic, so Angular can be notified when options change.
+ * Marks `<option>` as dynamic, so Angular can be notified when options change.
  *
  * #Example:
  *
@@ -53,7 +53,7 @@ export class SelectControlValueAccessor implements ControlValueAccessor {
     this._updateValueWhenListOfOptionsChanges(query);
   }
 
-  writeValue(value: any) {
+  writeValue(value: any): void {
     this.value = value;
     setProperty(this._renderer, this._elementRef, "value", value);
   }

modules/angular2/src/core/forms/directives/shared.ts

@@ -16,25 +16,25 @@ export function controlPath(name: string, parent: ControlContainer): string[] {
   return p;
 }
 
-export function setUpControl(c: Control, dir: NgControl) {
+export function setUpControl(control: Control, dir: NgControl): void {
-  if (isBlank(c)) _throwError(dir, "Cannot find control");
+  if (isBlank(control)) _throwError(dir, "Cannot find control");
   if (isBlank(dir.valueAccessor)) _throwError(dir, "No value accessor for");
 
-  c.validator = Validators.compose([c.validator, dir.validator]);
+  control.validator = Validators.compose([control.validator, dir.validator]);
-  dir.valueAccessor.writeValue(c.value);
+  dir.valueAccessor.writeValue(control.value);
 
   // view -> model
   dir.valueAccessor.registerOnChange(newValue => {
     dir.viewToModelUpdate(newValue);
-    c.updateValue(newValue, {emitModelToViewChange: false});
+    control.updateValue(newValue, {emitModelToViewChange: false});
-    c.markAsDirty();
+    control.markAsDirty();
   });
 
   // model -> view
-  c.registerOnChange(newValue => dir.valueAccessor.writeValue(newValue));
+  control.registerOnChange(newValue => dir.valueAccessor.writeValue(newValue));
 
   // touched
-  dir.valueAccessor.registerOnTouched(() => c.markAsTouched());
+  dir.valueAccessor.registerOnTouched(() => control.markAsTouched());
 }
 
 function _throwError(dir: NgControl, message: string): void {

modules/angular2/src/core/forms/form_builder.ts

@@ -15,9 +15,7 @@ import * as modelModule from './model';
  *
  * @Component({
  *   selector: 'login-comp',
- *   viewBindings: [
+ *   viewBindings: [FormBuilder]
- *     FormBuilder
- *   ]
  * })
  * @View({
  *   template: `
@@ -30,9 +28,7 @@ import * as modelModule from './model';
  *       </div>
  *     </form>
  *   `,
- *   directives: [
+ *   directives: [FORM_DIRECTIVES]
- *     FORM_DIRECTIVES
- *   ]
  * })
  * class LoginComp {
  *   loginForm: ControlGroup;
@@ -49,12 +45,12 @@ import * as modelModule from './model';
  *   }
  * }
  *
- * bootstrap(LoginComp)
+ * bootstrap(LoginComp);
  * ```
  *
  * This example creates a {@link ControlGroup} that consists of a `login` {@link Control}, and a
- * nested
+ * nested {@link ControlGroup} that defines a `password` and a `passwordConfirmation`
- * {@link ControlGroup} that defines a `password` and a `passwordConfirmation` {@link Control}:
+ * {@link Control}:
  *
  * ```
  *  var loginForm = builder.group({

modules/angular2/src/core/forms/model.ts

@@ -1,4 +1,4 @@
-import {StringWrapper, isPresent, isBlank} from 'angular2/src/core/facade/lang';
+import {StringWrapper, isPresent, isBlank, normalizeBool} from 'angular2/src/core/facade/lang';
 import {Observable, EventEmitter, ObservableWrapper} from 'angular2/src/core/facade/async';
 import {StringMap, StringMapWrapper, ListWrapper} from 'angular2/src/core/facade/collection';
 import {Validators} from './validators';
@@ -13,14 +13,15 @@ export const VALID = "VALID";
  */
 export const INVALID = "INVALID";
 
-export function isControl(c: Object): boolean {
+export function isControl(control: Object): boolean {
-  return c instanceof AbstractControl;
+  return control instanceof AbstractControl;
 }
 
-function _find(c: AbstractControl, path: Array<string | number>| string) {
+function _find(control: AbstractControl, path: Array<string | number>| string) {
   if (isBlank(path)) return null;
+
   if (!(path instanceof Array)) {
-    path = StringWrapper.split(<string>path, new RegExp("/"));
+    path = (<string>path).split("/");
   }
   if (path instanceof Array && ListWrapper.isEmpty(path)) return null;
 
@@ -33,7 +34,7 @@ function _find(c: AbstractControl, path: Array<string | number>| string) {
     } else {
       return null;
     }
-  }, c);
+  }, control);
 }
 
 /**
@@ -43,18 +44,13 @@ export class AbstractControl {
   _value: any;
   _status: string;
   _errors: StringMap<string, any>;
-  _pristine: boolean;
+  _pristine: boolean = true;
-  _touched: boolean;
+  _touched: boolean = false;
   _parent: ControlGroup | ControlArray;
-  validator: Function;
 
   _valueChanges: EventEmitter;
 
-  constructor(validator: Function) {
+  constructor(public validator: Function) {}
-    this.validator = validator;
-    this._pristine = true;
-    this._touched = false;
-  }
 
   get value(): any { return this._value; }
 
@@ -77,18 +73,18 @@ export class AbstractControl {
   markAsTouched(): void { this._touched = true; }
 
   markAsDirty({onlySelf}: {onlySelf?: boolean} = {}): void {
-    onlySelf = isPresent(onlySelf) ? onlySelf : false;
+    onlySelf = normalizeBool(onlySelf);
-
     this._pristine = false;
+
     if (isPresent(this._parent) && !onlySelf) {
       this._parent.markAsDirty({onlySelf: onlySelf});
     }
   }
 
-  setParent(parent: ControlGroup | ControlArray) { this._parent = parent; }
+  setParent(parent: ControlGroup | ControlArray): void { this._parent = parent; }
 
   updateValidity({onlySelf}: {onlySelf?: boolean} = {}): void {
-    onlySelf = isPresent(onlySelf) ? onlySelf : false;
+    onlySelf = normalizeBool(onlySelf);
 
     this._errors = this.validator(this);
     this._status = isPresent(this._errors) ? INVALID : VALID;
@@ -100,7 +96,7 @@ export class AbstractControl {
 
   updateValueAndValidity({onlySelf, emitEvent}: {onlySelf?: boolean, emitEvent?: boolean} = {}):
       void {
-    onlySelf = isPresent(onlySelf) ? onlySelf : false;
+    onlySelf = normalizeBool(onlySelf);
     emitEvent = isPresent(emitEvent) ? emitEvent : true;
 
     this._updateValue();
@@ -111,6 +107,7 @@ export class AbstractControl {
 
     this._errors = this.validator(this);
     this._status = isPresent(this._errors) ? INVALID : VALID;
+
     if (isPresent(this._parent) && !onlySelf) {
       this._parent.updateValueAndValidity({onlySelf: onlySelf, emitEvent: emitEvent});
     }
@@ -119,9 +116,9 @@ export class AbstractControl {
   find(path: Array<string | number>| string): AbstractControl { return _find(this, path); }
 
   getError(errorCode: string, path: string[] = null): any {
-    var c = isPresent(path) && !ListWrapper.isEmpty(path) ? this.find(path) : this;
+    var control = isPresent(path) && !ListWrapper.isEmpty(path) ? this.find(path) : this;
-    if (isPresent(c) && isPresent(c._errors)) {
+    if (isPresent(control) && isPresent(control._errors)) {
-      return StringMapWrapper.get(c._errors, errorCode);
+      return StringMapWrapper.get(control._errors, errorCode);
     } else {
       return null;
     }
@@ -138,8 +135,7 @@ export class AbstractControl {
  * Defines a part of a form that cannot be divided into other controls.
  *
  * `Control` is one of the three fundamental building blocks used to define forms in Angular, along
- * with
+ * with {@link ControlGroup} and {@link ControlArray}.
- * {@link ControlGroup} and {@link ControlArray}.
  */
 export class Control extends AbstractControl {
   _onChange: Function;
@@ -167,29 +163,22 @@ export class Control extends AbstractControl {
 /**
  * Defines a part of a form, of fixed length, that can contain other controls.
  *
- * A ControlGroup aggregates the values and errors of each {@link Control} in the group. Thus, if
+ * A `ControlGroup` aggregates the values and errors of each {@link Control} in the group. Thus, if
- * one of the controls
+ * one of the controls in a group is invalid, the entire group is invalid. Similarly, if a control
- * in a group is invalid, the entire group is invalid. Similarly, if a control changes its value,
+ * changes its value, the entire group changes as well.
- * the entire group
- * changes as well.
  *
  * `ControlGroup` is one of the three fundamental building blocks used to define forms in Angular,
- * along with
+ * along with {@link Control} and {@link ControlArray}. {@link ControlArray} can also contain other
- * {@link Control} and {@link ControlArray}. {@link ControlArray} can also contain other controls,
+ * controls, but is of variable length.
- * but is of variable
- * length.
  */
 export class ControlGroup extends AbstractControl {
-  controls: StringMap<string, AbstractControl>;
+  private _optionals: StringMap<string, boolean>;
-  _optionals: StringMap<string, boolean>;
 
-  constructor(controls: StringMap<string, AbstractControl>,
+  constructor(public controls: StringMap<string, AbstractControl>,
               optionals: StringMap<string, boolean> = null,
               validator: Function = Validators.group) {
     super(validator);
-    this.controls = controls;
     this._optionals = isPresent(optionals) ? optionals : {};
-
     this._valueChanges = new EventEmitter();
 
     this._setParentForControls();
@@ -197,12 +186,12 @@ export class ControlGroup extends AbstractControl {
     this.updateValidity({onlySelf: true});
   }
 
-  addControl(name: string, c: AbstractControl) {
+  addControl(name: string, control: AbstractControl): void {
-    this.controls[name] = c;
+    this.controls[name] = control;
-    c.setParent(this);
+    control.setParent(this);
   }
 
-  removeControl(name: string) { StringMapWrapper.delete(this.controls, name); }
+  removeControl(name: string): void { StringMapWrapper.delete(this.controls, name); }
 
   include(controlName: string): void {
     StringMapWrapper.set(this._optionals, controlName, true);
@@ -252,21 +241,16 @@ export class ControlGroup extends AbstractControl {
  * Defines a part of a form, of variable length, that can contain other controls.
  *
  * A `ControlArray` aggregates the values and errors of each {@link Control} in the group. Thus, if
- * one of the controls
+ * one of the controls in a group is invalid, the entire group is invalid. Similarly, if a control
- * in a group is invalid, the entire group is invalid. Similarly, if a control changes its value,
+ * changes its value, the entire group changes as well.
- * the entire group
- * changes as well.
  *
  * `ControlArray` is one of the three fundamental building blocks used to define forms in Angular,
  * along with {@link Control} and {@link ControlGroup}. {@link ControlGroup} can also contain
  * other controls, but is of fixed length.
  */
 export class ControlArray extends AbstractControl {
-  controls: AbstractControl[];
+  constructor(public controls: AbstractControl[], validator: Function = Validators.array) {
-
-  constructor(controls: AbstractControl[], validator: Function = Validators.array) {
     super(validator);
-    this.controls = controls;
 
     this._valueChanges = new EventEmitter();
 
@@ -296,9 +280,9 @@ export class ControlArray extends AbstractControl {
 
   get length(): number { return this.controls.length; }
 
-  _updateValue() { this._value = ListWrapper.map(this.controls, (c) => c.value); }
+  _updateValue(): void { this._value = this.controls.map((control) => control.value); }
 
-  _setParentForControls() {
+  _setParentForControls(): void {
-    ListWrapper.forEach(this.controls, (control) => { control.setParent(this); });
+    this.controls.forEach((control) => { control.setParent(this); });
   }
 }

modules/angular2/src/core/forms/validators.ts

@@ -17,8 +17,8 @@ export const NG_VALIDATORS: OpaqueToken = CONST_EXPR(new OpaqueToken("NgValidato
  * ```
  */
 export class Validators {
-  static required(c: modelModule.Control): StringMap<string, boolean> {
+  static required(control: modelModule.Control): StringMap<string, boolean> {
-    return isBlank(c.value) || c.value == "" ? {"required": true} : null;
+    return isBlank(control.value) || control.value == "" ? {"required": true} : null;
   }
 
   static nullValidator(c: any): StringMap<string, boolean> { return null; }
@@ -26,28 +26,28 @@ export class Validators {
   static compose(validators: Function[]): Function {
     if (isBlank(validators)) return Validators.nullValidator;
 
-    return function(c: modelModule.Control) {
+    return function(control: modelModule.Control) {
       var res = ListWrapper.reduce(validators, (res, validator) => {
-        var errors = validator(c);
+        var errors = validator(control);
         return isPresent(errors) ? StringMapWrapper.merge(res, errors) : res;
       }, {});
       return StringMapWrapper.isEmpty(res) ? null : res;
     };
   }
 
-  static group(c: modelModule.ControlGroup): StringMap<string, boolean> {
+  static group(group: modelModule.ControlGroup): StringMap<string, boolean> {
     var res = {};
-    StringMapWrapper.forEach(c.controls, (control, name) => {
+    StringMapWrapper.forEach(group.controls, (control, name) => {
-      if (c.contains(name) && isPresent(control.errors)) {
+      if (group.contains(name) && isPresent(control.errors)) {
         Validators._mergeErrors(control, res);
       }
     });
     return StringMapWrapper.isEmpty(res) ? null : res;
   }
 
-  static array(c: modelModule.ControlArray): StringMap<string, boolean> {
+  static array(array: modelModule.ControlArray): StringMap<string, boolean> {
     var res = {};
-    ListWrapper.forEach(c.controls, (control) => {
+    array.controls.forEach((control) => {
       if (isPresent(control.errors)) {
         Validators._mergeErrors(control, res);
       }

modules/examples/src/model_driven_forms/index.ts

@@ -19,7 +19,7 @@ import {RegExpWrapper, print, isPresent} from 'angular2/src/core/facade/lang';
  * Custom validator.
  */
 function creditCardValidator(c): StringMap<string, boolean> {
-  if (isPresent(c.value) && RegExpWrapper.test(new RegExp("^\\d{16}$"), c.value)) {
+  if (isPresent(c.value) && RegExpWrapper.test(/^\d{16}$/g, c.value)) {
     return null;
   } else {
     return {"invalidCreditCard": true};
@@ -55,17 +55,19 @@ class ShowError {
 
   constructor(@Host() formDir: NgFormModel) { this.formDir = formDir; }
 
-  get errorMessage() {
+  get errorMessage(): string {
-    var c = this.formDir.form.find(this.controlPath);
+    var control = this.formDir.form.find(this.controlPath);
-    for (var i = 0; i < this.errorTypes.length; ++i) {
+    if (isPresent(control) && control.touched) {
-      if (isPresent(c) && c.touched && c.hasError(this.errorTypes[i])) {
+      for (var i = 0; i < this.errorTypes.length; ++i) {
-        return this._errorMessage(this.errorTypes[i]);
+        if (control.hasError(this.errorTypes[i])) {
+          return this._errorMessage(this.errorTypes[i]);
+        }
       }
     }
     return null;
   }
 
-  _errorMessage(code) {
+  _errorMessage(code: string): string {
     var config = {'required': 'is required', 'invalidCreditCard': 'is invalid credit card number'};
     return config[code];
   }
@@ -148,7 +150,7 @@ class ModelDrivenForms {
     });
   }
 
-  onSubmit() {
+  onSubmit(): void {
     print("Submitting:");
     print(this.form.value);
   }

modules/examples/src/template_driven_forms/index.ts

@@ -36,7 +36,7 @@ class CheckoutModel {
  * Custom validator.
  */
 function creditCardValidator(c): StringMap<string, boolean> {
-  if (isPresent(c.value) && RegExpWrapper.test(new RegExp("^\\d{16}$"), c.value)) {
+  if (isPresent(c.value) && RegExpWrapper.test(/^\d{16}$/g, c.value)) {
     return null;
   } else {
     return {"invalidCreditCard": true};
@@ -79,17 +79,19 @@ class ShowError {
 
   constructor(@Host() formDir: NgForm) { this.formDir = formDir; }
 
-  get errorMessage() {
+  get errorMessage(): string {
-    var c = this.formDir.form.find(this.controlPath);
+    var control = this.formDir.form.find(this.controlPath);
-    for (var i = 0; i < this.errorTypes.length; ++i) {
+    if (isPresent(control) && control.touched) {
-      if (isPresent(c) && c.touched && c.hasError(this.errorTypes[i])) {
+      for (var i = 0; i < this.errorTypes.length; ++i) {
-        return this._errorMessage(this.errorTypes[i]);
+        if (control.hasError(this.errorTypes[i])) {
+          return this._errorMessage(this.errorTypes[i]);
+        }
       }
     }
     return null;
   }
 
-  _errorMessage(code) {
+  _errorMessage(code: string): string {
     var config = {'required': 'is required', 'invalidCreditCard': 'is invalid credit card number'};
     return config[code];
   }
@@ -159,7 +161,7 @@ class TemplateDrivenForms {
   model = new CheckoutModel();
   countries = ['US', 'Canada'];
 
-  onSubmit() {
+  onSubmit(): void {
     print("Submitting:");
     print(this.model);
   }