TypeScript di.forwardRef函數代碼示例

import {forwardRef, Binding} from 'angular2/di';
import {CONST_EXPR} from 'angular2/src/facade/lang';
import {Directive} from '../../../angular2';
import {Validators} from '../validators';

export class NgValidator {
  get validator(): Function { throw "Is not implemented"; }
}

const requiredValidatorBinding =
    CONST_EXPR(new Binding(NgValidator, {toAlias: forwardRef(() => NgRequiredValidator)}));

@Directive({
  selector: '[required][ng-control],[required][ng-form-control],[required][ng-model]',
  hostInjector: [requiredValidatorBinding]
})
export class NgRequiredValidator extends NgValidator {
  get validator(): Function { return Validators.required; }
}

import {CONST_EXPR} from 'angular2/src/facade/lang';
import {StringMapWrapper} from 'angular2/src/facade/collection';
import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';

import {Directive, Ancestor, onChange} from 'angular2/angular2';
import {forwardRef, Binding} from 'angular2/di';

import {NgControl} from './ng_control';
import {Control} from '../model';
import {setUpControl} from './shared';

const formControlBinding =
    CONST_EXPR(new Binding(NgControl, {toAlias: forwardRef(() => NgFormControl)}));

/**
 * Binds an existing control to a DOM element.
 *
 * # Example
 *
 * In this example, we bind the control to an input element. When the value of the input element
 * changes, the value of
 * the control will reflect that change. Likewise, if the value of the control changes, the input
 * element reflects that
 * change.
 *
 *  ```
 * @Component({selector: "login-comp"})
 * @View({
 *      directives: [formDirectives],
 *      template: "<input type='text' [ng-form-control]='loginControl'>"
 *      })

import {CONST_EXPR} from 'angular2/src/facade/lang';
import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
import {StringMapWrapper} from 'angular2/src/facade/collection';

import {Directive, Ancestor, onChange} from 'angular2/angular2';
import {forwardRef, Binding} from 'angular2/di';

import {NgControl} from './ng_control';
import {Control} from '../model';
import {setUpControl} from './shared';

const formControlBinding = CONST_EXPR(new Binding(NgControl, {toAlias: forwardRef(() => NgModel)}));

/**
 * Binds a domain model to the form.
 *
 * # Example
 *  ```
 * @Component({selector: "search-comp"})
 * @View({
 *      directives: [formDirectives],
 *      template: `
              <input type='text' [(ng-model)]="searchQuery">
 *      `})
 * class SearchComp {
 *  searchQuery: string;
 * }
 *  ```
 *
 * @exportedAs angular2/forms
 */

 it('should wrap and unwrap the reference', () => {
   var ref = forwardRef(() => String);
   expect(ref instanceof Type).toBe(true);
   expect(resolveForwardRef(ref)).toBe(String);
 });