100 lines
2.8 KiB
TypeScript
100 lines
2.8 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 {
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OnChanges,
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SimpleChange,
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Directive,
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forwardRef,
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Provider,
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Inject,
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Optional,
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Self
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} from 'angular2/core';
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import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
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import {NgControl} from './ng_control';
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import {Control} from '../model';
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import {NG_VALIDATORS, NG_ASYNC_VALIDATORS} from '../validators';
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import {
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setUpControl,
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isPropertyUpdated,
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selectValueAccessor,
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composeValidators,
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composeAsyncValidators
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} from './shared';
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import {ValidatorFn, AsyncValidatorFn} from './validators';
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const formControlBinding =
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CONST_EXPR(new Provider(NgControl, {useExisting: forwardRef(() => NgModel)}));
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/**
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* Binds a domain model to a form control.
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*
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* ### Usage
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*
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* `ngModel` binds an existing domain model to a form control. For a
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* two-way binding, use `[(ngModel)]` to ensure the model updates in
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* both directions.
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*
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* ### Example ([live demo](http://plnkr.co/edit/R3UX5qDaUqFO2VYR0UzH?p=preview))
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* ```typescript
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* @Component({
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* selector: "search-comp",
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* directives: [FORM_DIRECTIVES],
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* template: `<input type='text' [(ngModel)]="searchQuery">`
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* })
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* class SearchComp {
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* searchQuery: string;
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* }
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* ```
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*/
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@Directive({
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selector: '[ngModel]:not([ngControl]):not([ngFormControl])',
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bindings: [formControlBinding],
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inputs: ['model: ngModel'],
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outputs: ['update: ngModelChange'],
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exportAs: 'ngForm'
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})
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export class NgModel extends NgControl implements OnChanges {
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/** @internal */
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_control = new Control();
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/** @internal */
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_added = false;
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update = new EventEmitter();
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model: any;
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viewModel: any;
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constructor(@Optional() @Self() @Inject(NG_VALIDATORS) private _validators: any[],
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@Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) private _asyncValidators: any[],
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@Optional() @Self() @Inject(NG_VALUE_ACCESSOR)
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valueAccessors: ControlValueAccessor[]) {
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super();
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this.valueAccessor = selectValueAccessor(this, valueAccessors);
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}
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ngOnChanges(changes: {[key: string]: SimpleChange}) {
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if (!this._added) {
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setUpControl(this._control, this);
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this._control.updateValueAndValidity({emitEvent: false});
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this._added = true;
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}
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if (isPropertyUpdated(changes, this.viewModel)) {
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this._control.updateValue(this.model);
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this.viewModel = this.model;
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}
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}
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get control(): Control { return this._control; }
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get path(): string[] { return []; }
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get validator(): ValidatorFn { return composeValidators(this._validators); }
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get asyncValidator(): AsyncValidatorFn { return composeAsyncValidators(this._asyncValidators); }
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viewToModelUpdate(newValue: any): void {
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this.viewModel = newValue;
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ObservableWrapper.callEmit(this.update, newValue);
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}
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}
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