114 lines
3.4 KiB
TypeScript
114 lines
3.4 KiB
TypeScript
import {CONST_EXPR} from 'angular2/src/facade/lang';
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import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
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import {List, StringMapWrapper, StringMap} from 'angular2/src/facade/collection';
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import {Directive, Ancestor, onDestroy, onChange} from 'angular2/angular2';
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import {forwardRef, Binding, Inject} from 'angular2/di';
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import {ControlContainer} from './control_container';
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import {NgControl} from './ng_control';
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import {controlPath} from './shared';
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import {Control} from '../model';
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const controlNameBinding =
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CONST_EXPR(new Binding(NgControl, {toAlias: forwardRef(() => NgControlName)}));
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/**
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* Creates and binds a control with a specified name to a DOM element.
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*
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* This directive can only be used as a child of {@link NgForm} or {@link NgFormModel}.
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* # Example
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*
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* In this example, we create the login and password controls.
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* We can work with each control separately: check its validity, get its value, listen to its
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changes.
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*
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* ```
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* @Component({selector: "login-comp"})
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* @View({
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* directives: [formDirectives],
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* template: `
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* <form #f="form" (submit)='onLogIn(f.value)'>
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* Login <input type='text' ng-control='login' #l="form">
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* <div *ng-if="!l.valid">Login is invalid</div>
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*
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* Password <input type='password' ng-control='password'>
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* <button type='submit'>Log in!</button>
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* </form>
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* `})
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* class LoginComp {
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* onLogIn(value) {
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* // value === {login: 'some login', password: 'some password'}
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* }
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* }
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* ```
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*
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* We can also use ng-model to bind a domain model to the form.
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*
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* ```
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* @Component({selector: "login-comp"})
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* @View({
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* directives: [formDirectives],
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* template: `
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* <form (submit)='onLogIn()'>
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* Login <input type='text' ng-control='login' [(ng-model)]="credentials.login">
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* Password <input type='password' ng-control='password'
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[(ng-model)]="credentials.password">
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* <button type='submit'>Log in!</button>
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* </form>
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* `})
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* class LoginComp {
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* credentials: {login:string, password:string};
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*
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* onLogIn() {
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* // this.credentials.login === "some login"
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* // this.credentials.password === "some password"
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* }
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* }
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* ```
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*
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* @exportedAs angular2/forms
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*/
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@Directive({
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selector: '[ng-control]',
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hostInjector: [controlNameBinding],
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properties: ['name: ng-control', 'model: ng-model'],
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events: ['ngModel'],
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lifecycle: [onDestroy, onChange],
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exportAs: 'form'
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})
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export class NgControlName extends NgControl {
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_parent: ControlContainer;
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ngModel: EventEmitter;
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model: any;
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_added: boolean;
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constructor(@Ancestor() _parent: ControlContainer) {
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super();
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this._parent = _parent;
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this.ngModel = new EventEmitter();
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this._added = false;
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}
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onChange(c: StringMap<string, any>) {
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if (!this._added) {
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this.formDirective.addControl(this);
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this._added = true;
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}
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if (StringMapWrapper.contains(c, "model")) {
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this.formDirective.updateModel(this, this.model);
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}
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}
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onDestroy() { this.formDirective.removeControl(this); }
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viewToModelUpdate(newValue: any): void { ObservableWrapper.callNext(this.ngModel, newValue); }
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get path(): List<string> { return controlPath(this.name, this._parent); }
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get formDirective(): any { return this._parent.formDirective; }
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get control(): Control { return this.formDirective.getControl(this); }
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} |