@angular/forms
Version:
Angular - directives and services for creating forms
199 lines • 24.6 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Directive, ElementRef, forwardRef, inject, Injectable, Injector, Input, Renderer2, ɵRuntimeError as RuntimeError } from '@angular/core';
import { BuiltInControlValueAccessor, NG_VALUE_ACCESSOR } from './control_value_accessor';
import { NgControl } from './ng_control';
import { CALL_SET_DISABLED_STATE, setDisabledStateDefault } from './shared';
import * as i0 from "@angular/core";
const RADIO_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => RadioControlValueAccessor),
multi: true
};
function throwNameError() {
throw new RuntimeError(1202 /* RuntimeErrorCode.NAME_AND_FORM_CONTROL_NAME_MUST_MATCH */, `
If you define both a name and a formControlName attribute on your radio button, their values
must match. Ex: <input type="radio" formControlName="food" name="food">
`);
}
/**
* @description
* Class used by Angular to track radio buttons. For internal use only.
*/
export class RadioControlRegistry {
constructor() {
this._accessors = [];
}
/**
* @description
* Adds a control to the internal registry. For internal use only.
*/
add(control, accessor) {
this._accessors.push([control, accessor]);
}
/**
* @description
* Removes a control from the internal registry. For internal use only.
*/
remove(accessor) {
for (let i = this._accessors.length - 1; i >= 0; --i) {
if (this._accessors[i][1] === accessor) {
this._accessors.splice(i, 1);
return;
}
}
}
/**
* @description
* Selects a radio button. For internal use only.
*/
select(accessor) {
this._accessors.forEach((c) => {
if (this._isSameGroup(c, accessor) && c[1] !== accessor) {
c[1].fireUncheck(accessor.value);
}
});
}
_isSameGroup(controlPair, accessor) {
if (!controlPair[0].control)
return false;
return controlPair[0]._parent === accessor._control._parent &&
controlPair[1].name === accessor.name;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: RadioControlRegistry, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: RadioControlRegistry, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: RadioControlRegistry, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}] });
/**
* @description
* The `ControlValueAccessor` for writing radio control values and listening to radio control
* changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and
* `NgModel` directives.
*
* @usageNotes
*
* ### Using radio buttons with reactive form directives
*
* The follow example shows how to use radio buttons in a reactive form. When using radio buttons in
* a reactive form, radio buttons in the same group should have the same `formControlName`.
* Providing a `name` attribute is optional.
*
* {@example forms/ts/reactiveRadioButtons/reactive_radio_button_example.ts region='Reactive'}
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class RadioControlValueAccessor extends BuiltInControlValueAccessor {
constructor(renderer, elementRef, _registry, _injector) {
super(renderer, elementRef);
this._registry = _registry;
this._injector = _injector;
this.setDisabledStateFired = false;
/**
* The registered callback function called when a change event occurs on the input element.
* Note: we declare `onChange` here (also used as host listener) as a function with no arguments
* to override the `onChange` function (which expects 1 argument) in the parent
* `BaseControlValueAccessor` class.
* @nodoc
*/
this.onChange = () => { };
this.callSetDisabledState = inject(CALL_SET_DISABLED_STATE, { optional: true }) ?? setDisabledStateDefault;
}
/** @nodoc */
ngOnInit() {
this._control = this._injector.get(NgControl);
this._checkName();
this._registry.add(this._control, this);
}
/** @nodoc */
ngOnDestroy() {
this._registry.remove(this);
}
/**
* Sets the "checked" property value on the radio input element.
* @nodoc
*/
writeValue(value) {
this._state = value === this.value;
this.setProperty('checked', this._state);
}
/**
* Registers a function called when the control value changes.
* @nodoc
*/
registerOnChange(fn) {
this._fn = fn;
this.onChange = () => {
fn(this.value);
this._registry.select(this);
};
}
/** @nodoc */
setDisabledState(isDisabled) {
/**
* `setDisabledState` is supposed to be called whenever the disabled state of a control changes,
* including upon control creation. However, a longstanding bug caused the method to not fire
* when an *enabled* control was attached. This bug was fixed in v15 in #47576.
*
* This had a side effect: previously, it was possible to instantiate a reactive form control
* with `[attr.disabled]=true`, even though the corresponding control was enabled in the
* model. This resulted in a mismatch between the model and the DOM. Now, because
* `setDisabledState` is always called, the value in the DOM will be immediately overwritten
* with the "correct" enabled value.
*
* However, the fix also created an exceptional case: radio buttons. Because Reactive Forms
* models the entire group of radio buttons as a single `FormControl`, there is no way to
* control the disabled state for individual radios, so they can no longer be configured as
* disabled. Thus, we keep the old behavior for radio buttons, so that `[attr.disabled]`
* continues to work. Specifically, we drop the first call to `setDisabledState` if `disabled`
* is `false`, and we are not in legacy mode.
*/
if (this.setDisabledStateFired || isDisabled ||
this.callSetDisabledState === 'whenDisabledForLegacyCode') {
this.setProperty('disabled', isDisabled);
}
this.setDisabledStateFired = true;
}
/**
* Sets the "value" on the radio input element and unchecks it.
*
* @param value
*/
fireUncheck(value) {
this.writeValue(value);
}
_checkName() {
if (this.name && this.formControlName && this.name !== this.formControlName &&
(typeof ngDevMode === 'undefined' || ngDevMode)) {
throwNameError();
}
if (!this.name && this.formControlName)
this.name = this.formControlName;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: RadioControlValueAccessor, deps: [{ token: i0.Renderer2 }, { token: i0.ElementRef }, { token: RadioControlRegistry }, { token: i0.Injector }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.3.5", type: RadioControlValueAccessor, selector: "input[type=radio][formControlName],input[type=radio][formControl],input[type=radio][ngModel]", inputs: { name: "name", formControlName: "formControlName", value: "value" }, host: { listeners: { "change": "onChange()", "blur": "onTouched()" } }, providers: [RADIO_VALUE_ACCESSOR], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: RadioControlValueAccessor, decorators: [{
type: Directive,
args: [{
selector: 'input[type=radio][formControlName],input[type=radio][formControl],input[type=radio][ngModel]',
host: { '(change)': 'onChange()', '(blur)': 'onTouched()' },
providers: [RADIO_VALUE_ACCESSOR]
}]
}], ctorParameters: () => [{ type: i0.Renderer2 }, { type: i0.ElementRef }, { type: RadioControlRegistry }, { type: i0.Injector }], propDecorators: { name: [{
type: Input
}], formControlName: [{
type: Input
}], value: [{
type: Input
}] } });
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Ex: <input type=\"radio\" formControlName=\"food\" name=\"food\">\n    `);\n}\n\n/**\n * @description\n * Class used by Angular to track radio buttons. For internal use only.\n */\n@Injectable({providedIn: 'root'})\nexport class RadioControlRegistry {\n  private _accessors: any[] = [];\n\n  /**\n   * @description\n   * Adds a control to the internal registry. For internal use only.\n   */\n  add(control: NgControl, accessor: RadioControlValueAccessor) {\n    this._accessors.push([control, accessor]);\n  }\n\n  /**\n   * @description\n   * Removes a control from the internal registry. For internal use only.\n   */\n  remove(accessor: RadioControlValueAccessor) {\n    for (let i = this._accessors.length - 1; i >= 0; --i) {\n      if (this._accessors[i][1] === accessor) {\n        this._accessors.splice(i, 1);\n        return;\n      }\n    }\n  }\n\n  /**\n   * @description\n   * Selects a radio button. For internal use only.\n   */\n  select(accessor: RadioControlValueAccessor) {\n    this._accessors.forEach((c) => {\n      if (this._isSameGroup(c, accessor) && c[1] !== accessor) {\n        c[1].fireUncheck(accessor.value);\n      }\n    });\n  }\n\n  private _isSameGroup(\n      controlPair: [NgControl, RadioControlValueAccessor],\n      accessor: RadioControlValueAccessor): boolean {\n    if (!controlPair[0].control) return false;\n    return controlPair[0]._parent === accessor._control._parent &&\n        controlPair[1].name === accessor.name;\n  }\n}\n\n/**\n * @description\n * The `ControlValueAccessor` for writing radio control values and listening to radio control\n * changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and\n * `NgModel` directives.\n *\n * @usageNotes\n *\n * ### Using radio buttons with reactive form directives\n *\n * The follow example shows how to use radio buttons in a reactive form. When using radio buttons in\n * a reactive form, radio buttons in the same group should have the same `formControlName`.\n * Providing a `name` attribute is optional.\n *\n * {@example forms/ts/reactiveRadioButtons/reactive_radio_button_example.ts region='Reactive'}\n *\n * @ngModule ReactiveFormsModule\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector:\n      'input[type=radio][formControlName],input[type=radio][formControl],input[type=radio][ngModel]',\n  host: {'(change)': 'onChange()', '(blur)': 'onTouched()'},\n  providers: [RADIO_VALUE_ACCESSOR]\n})\nexport class RadioControlValueAccessor extends BuiltInControlValueAccessor implements\n    ControlValueAccessor, OnDestroy, OnInit {\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _state!: boolean;\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _control!: NgControl;\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _fn!: Function;\n\n  private setDisabledStateFired = false;\n\n  /**\n   * The registered callback function called when a change event occurs on the input element.\n   * Note: we declare `onChange` here (also used as host listener) as a function with no arguments\n   * to override the `onChange` function (which expects 1 argument) in the parent\n   * `BaseControlValueAccessor` class.\n   * @nodoc\n   */\n  override onChange = () => {};\n\n  /**\n   * @description\n   * Tracks the name of the radio input element.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() name!: string;\n\n  /**\n   * @description\n   * Tracks the name of the `FormControl` bound to the directive. The name corresponds\n   * to a key in the parent `FormGroup` or `FormArray`.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() formControlName!: string;\n\n  /**\n   * @description\n   * Tracks the value of the radio input element\n   */\n  @Input() value: any;\n\n  private callSetDisabledState =\n      inject(CALL_SET_DISABLED_STATE, {optional: true}) ?? setDisabledStateDefault;\n\n  constructor(\n      renderer: Renderer2, elementRef: ElementRef, private _registry: RadioControlRegistry,\n      private _injector: Injector) {\n    super(renderer, elementRef);\n  }\n\n  /** @nodoc */\n  ngOnInit(): void {\n    this._control = this._injector.get(NgControl);\n    this._checkName();\n    this._registry.add(this._control, this);\n  }\n\n  /** @nodoc */\n  ngOnDestroy(): void {\n    this._registry.remove(this);\n  }\n\n  /**\n   * Sets the \"checked\" property value on the radio input element.\n   * @nodoc\n   */\n  writeValue(value: any): void {\n    this._state = value === this.value;\n    this.setProperty('checked', this._state);\n  }\n\n  /**\n   * Registers a function called when the control value changes.\n   * @nodoc\n   */\n  override registerOnChange(fn: (_: any) => {}): void {\n    this._fn = fn;\n    this.onChange = () => {\n      fn(this.value);\n      this._registry.select(this);\n    };\n  }\n\n  /** @nodoc */\n  override setDisabledState(isDisabled: boolean): void {\n    /**\n     * `setDisabledState` is supposed to be called whenever the disabled state of a control changes,\n     * including upon control creation. However, a longstanding bug caused the method to not fire\n     * when an *enabled* control was attached. This bug was fixed in v15 in #47576.\n     *\n     * This had a side effect: previously, it was possible to instantiate a reactive form control\n     * with `[attr.disabled]=true`, even though the corresponding control was enabled in the\n     * model. This resulted in a mismatch between the model and the DOM. Now, because\n     * `setDisabledState` is always called, the value in the DOM will be immediately overwritten\n     * with the \"correct\" enabled value.\n     *\n     * However, the fix also created an exceptional case: radio buttons. Because Reactive Forms\n     * models the entire group of radio buttons as a single `FormControl`, there is no way to\n     * control the disabled state for individual radios, so they can no longer be configured as\n     * disabled. Thus, we keep the old behavior for radio buttons, so that `[attr.disabled]`\n     * continues to work. Specifically, we drop the first call to `setDisabledState` if `disabled`\n     * is `false`, and we are not in legacy mode.\n     */\n    if (this.setDisabledStateFired || isDisabled ||\n        this.callSetDisabledState === 'whenDisabledForLegacyCode') {\n      this.setProperty('disabled', isDisabled);\n    }\n    this.setDisabledStateFired = true;\n  }\n\n  /**\n   * Sets the \"value\" on the radio input element and unchecks it.\n   *\n   * @param value\n   */\n  fireUncheck(value: any): void {\n    this.writeValue(value);\n  }\n\n  private _checkName(): void {\n    if (this.name && this.formControlName && this.name !== this.formControlName &&\n        (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throwNameError();\n    }\n    if (!this.name && this.formControlName) this.name = this.formControlName;\n  }\n}\n"]}