angular2/es6/prod/src/common/forms/directives/radio_control_value_accessor.js

Angular 2 - a web framework for modern web apps

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    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Directive, ElementRef, Renderer, forwardRef, Provider, Input, Injector, Injectable } from 'angular2/core';
import { NG_VALUE_ACCESSOR } from 'angular2/src/common/forms/directives/control_value_accessor';
import { NgControl } from 'angular2/src/common/forms/directives/ng_control';
import { CONST_EXPR, isPresent } from 'angular2/src/facade/lang';
import { ListWrapper } from 'angular2/src/facade/collection';
const RADIO_VALUE_ACCESSOR = CONST_EXPR(new Provider(NG_VALUE_ACCESSOR, { useExisting: forwardRef(() => RadioControlValueAccessor), multi: true }));
/**
 * Internal class used by Angular to uncheck radio buttons with the matching name.
 */
export let RadioControlRegistry = class RadioControlRegistry {
    constructor() {
        this._accessors = [];
    }
    add(control, accessor) {
        this._accessors.push([control, accessor]);
    }
    remove(accessor) {
        var indexToRemove = -1;
        for (var i = 0; i < this._accessors.length; ++i) {
            if (this._accessors[i][1] === accessor) {
                indexToRemove = i;
            }
        }
        ListWrapper.removeAt(this._accessors, indexToRemove);
    }
    select(accessor) {
        this._accessors.forEach((c) => {
            if (c[0].control.root === accessor._control.control.root && c[1] !== accessor) {
                c[1].fireUncheck();
            }
        });
    }
};
RadioControlRegistry = __decorate([
    Injectable(), 
    __metadata('design:paramtypes', [])
], RadioControlRegistry);
/**
 * The value provided by the forms API for radio buttons.
 */
export class RadioButtonState {
    constructor(checked, value) {
        this.checked = checked;
        this.value = value;
    }
}
/**
 * The accessor for writing a radio control value and listening to changes that is used by the
 * {@link NgModel}, {@link NgFormControl}, and {@link NgControlName} directives.
 *
 *  ### Example
 *  ```
 *  @Component({
 *    template: `
 *      <input type="radio" name="food" [(ngModel)]="foodChicken">
 *      <input type="radio" name="food" [(ngModel)]="foodFish">
 *    `
 *  })
 *  class FoodCmp {
 *    foodChicken = new RadioButtonState(true, "chicken");
 *    foodFish = new RadioButtonState(false, "fish");
 *  }
 *  ```
 */
export let RadioControlValueAccessor = class RadioControlValueAccessor {
    constructor(_renderer, _elementRef, _registry, _injector) {
        this._renderer = _renderer;
        this._elementRef = _elementRef;
        this._registry = _registry;
        this._injector = _injector;
        this.onChange = () => { };
        this.onTouched = () => { };
    }
    ngOnInit() {
        this._control = this._injector.get(NgControl);
        this._registry.add(this._control, this);
    }
    ngOnDestroy() { this._registry.remove(this); }
    writeValue(value) {
        this._state = value;
        if (isPresent(value) && value.checked) {
            this._renderer.setElementProperty(this._elementRef.nativeElement, 'checked', true);
        }
    }
    registerOnChange(fn) {
        this._fn = fn;
        this.onChange = () => {
            fn(new RadioButtonState(true, this._state.value));
            this._registry.select(this);
        };
    }
    fireUncheck() { this._fn(new RadioButtonState(false, this._state.value)); }
    registerOnTouched(fn) { this.onTouched = fn; }
};
__decorate([
    Input(), 
    __metadata('design:type', String)
], RadioControlValueAccessor.prototype, "name", void 0);
RadioControlValueAccessor = __decorate([
    Directive({
        selector: 'input[type=radio][ngControl],input[type=radio][ngFormControl],input[type=radio][ngModel]',
        host: { '(change)': 'onChange()', '(blur)': 'onTouched()' },
        providers: [RADIO_VALUE_ACCESSOR]
    }), 
    __metadata('design:paramtypes', [Renderer, ElementRef, RadioControlRegistry, Injector])
], RadioControlValueAccessor);