@angular/forms
Version:
Angular - directives and services for creating forms
331 lines • 40.1 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 { booleanAttribute, ChangeDetectorRef, Directive, EventEmitter, forwardRef, Host, Inject, Input, Optional, Output, Self } from '@angular/core';
import { FormControl } from '../model/form_control';
import { NG_ASYNC_VALIDATORS, NG_VALIDATORS } from '../validators';
import { AbstractFormGroupDirective } from './abstract_form_group_directive';
import { ControlContainer } from './control_container';
import { NG_VALUE_ACCESSOR } from './control_value_accessor';
import { NgControl } from './ng_control';
import { NgForm } from './ng_form';
import { NgModelGroup } from './ng_model_group';
import { CALL_SET_DISABLED_STATE, controlPath, isPropertyUpdated, selectValueAccessor, setUpControl } from './shared';
import { formGroupNameException, missingNameException, modelParentException } from './template_driven_errors';
import * as i0 from "@angular/core";
import * as i1 from "./control_container";
const formControlBinding = {
provide: NgControl,
useExisting: forwardRef(() => NgModel)
};
/**
* `ngModel` forces an additional change detection run when its inputs change:
* E.g.:
* ```
* <div>{{myModel.valid}}</div>
* <input [(ngModel)]="myValue" #myModel="ngModel">
* ```
* I.e. `ngModel` can export itself on the element and then be used in the template.
* Normally, this would result in expressions before the `input` that use the exported directive
* to have an old value as they have been
* dirty checked before. As this is a very common case for `ngModel`, we added this second change
* detection run.
*
* Notes:
* - this is just one extra run no matter how many `ngModel`s have been changed.
* - this is a general problem when using `exportAs` for directives!
*/
const resolvedPromise = (() => Promise.resolve())();
/**
* @description
* Creates a `FormControl` instance from a [domain
* model](https://en.wikipedia.org/wiki/Domain_model) and binds it to a form control element.
*
* The `FormControl` instance tracks the value, user interaction, and
* validation status of the control and keeps the view synced with the model. If used
* within a parent form, the directive also registers itself with the form as a child
* control.
*
* This directive is used by itself or as part of a larger form. Use the
* `ngModel` selector to activate it.
*
* It accepts a domain model as an optional `Input`. If you have a one-way binding
* to `ngModel` with `[]` syntax, changing the domain model's value in the component
* class sets the value in the view. If you have a two-way binding with `[()]` syntax
* (also known as 'banana-in-a-box syntax'), the value in the UI always syncs back to
* the domain model in your class.
*
* To inspect the properties of the associated `FormControl` (like the validity state),
* export the directive into a local template variable using `ngModel` as the key (ex:
* `#myVar="ngModel"`). You can then access the control using the directive's `control` property.
* However, the most commonly used properties (like `valid` and `dirty`) also exist on the control
* for direct access. See a full list of properties directly available in
* `AbstractControlDirective`.
*
* @see {@link RadioControlValueAccessor}
* @see {@link SelectControlValueAccessor}
*
* @usageNotes
*
* ### Using ngModel on a standalone control
*
* The following examples show a simple standalone control using `ngModel`:
*
* {@example forms/ts/simpleNgModel/simple_ng_model_example.ts region='Component'}
*
* When using the `ngModel` within `<form>` tags, you'll also need to supply a `name` attribute
* so that the control can be registered with the parent form under that name.
*
* In the context of a parent form, it's often unnecessary to include one-way or two-way binding,
* as the parent form syncs the value for you. You access its properties by exporting it into a
* local template variable using `ngForm` such as (`#f="ngForm"`). Use the variable where
* needed on form submission.
*
* If you do need to populate initial values into your form, using a one-way binding for
* `ngModel` tends to be sufficient as long as you use the exported form's value rather
* than the domain model's value on submit.
*
* ### Using ngModel within a form
*
* The following example shows controls using `ngModel` within a form:
*
* {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}
*
* ### Using a standalone ngModel within a group
*
* The following example shows you how to use a standalone ngModel control
* within a form. This controls the display of the form, but doesn't contain form data.
*
* ```html
* <form>
* <input name="login" ngModel placeholder="Login">
* <input type="checkbox" ngModel [ngModelOptions]="{standalone: true}"> Show more options?
* </form>
* <!-- form value: {login: ''} -->
* ```
*
* ### Setting the ngModel `name` attribute through options
*
* The following example shows you an alternate way to set the name attribute. Here,
* an attribute identified as name is used within a custom form control component. To still be able
* to specify the NgModel's name, you must specify it using the `ngModelOptions` input instead.
*
* ```html
* <form>
* <my-custom-form-control name="Nancy" ngModel [ngModelOptions]="{name: 'user'}">
* </my-custom-form-control>
* </form>
* <!-- form value: {user: ''} -->
* ```
*
* @ngModule FormsModule
* @publicApi
*/
export class NgModel extends NgControl {
constructor(parent, validators, asyncValidators, valueAccessors, _changeDetectorRef, callSetDisabledState) {
super();
this._changeDetectorRef = _changeDetectorRef;
this.callSetDisabledState = callSetDisabledState;
this.control = new FormControl();
/** @internal */
this._registered = false;
/**
* @description
* Tracks the name bound to the directive. If a parent form exists, it
* uses this name as a key to retrieve this control's value.
*/
this.name = '';
/**
* @description
* Event emitter for producing the `ngModelChange` event after
* the view model updates.
*/
this.update = new EventEmitter();
this._parent = parent;
this._setValidators(validators);
this._setAsyncValidators(asyncValidators);
this.valueAccessor = selectValueAccessor(this, valueAccessors);
}
/** @nodoc */
ngOnChanges(changes) {
this._checkForErrors();
if (!this._registered || 'name' in changes) {
if (this._registered) {
this._checkName();
if (this.formDirective) {
// We can't call `formDirective.removeControl(this)`, because the `name` has already been
// changed. We also can't reset the name temporarily since the logic in `removeControl`
// is inside a promise and it won't run immediately. We work around it by giving it an
// object with the same shape instead.
const oldName = changes['name'].previousValue;
this.formDirective.removeControl({ name: oldName, path: this._getPath(oldName) });
}
}
this._setUpControl();
}
if ('isDisabled' in changes) {
this._updateDisabled(changes);
}
if (isPropertyUpdated(changes, this.viewModel)) {
this._updateValue(this.model);
this.viewModel = this.model;
}
}
/** @nodoc */
ngOnDestroy() {
this.formDirective && this.formDirective.removeControl(this);
}
/**
* @description
* Returns an array that represents the path from the top-level form to this control.
* Each index is the string name of the control on that level.
*/
get path() {
return this._getPath(this.name);
}
/**
* @description
* The top-level directive for this control if present, otherwise null.
*/
get formDirective() {
return this._parent ? this._parent.formDirective : null;
}
/**
* @description
* Sets the new value for the view model and emits an `ngModelChange` event.
*
* @param newValue The new value emitted by `ngModelChange`.
*/
viewToModelUpdate(newValue) {
this.viewModel = newValue;
this.update.emit(newValue);
}
_setUpControl() {
this._setUpdateStrategy();
this._isStandalone() ? this._setUpStandalone() : this.formDirective.addControl(this);
this._registered = true;
}
_setUpdateStrategy() {
if (this.options && this.options.updateOn != null) {
this.control._updateOn = this.options.updateOn;
}
}
_isStandalone() {
return !this._parent || !!(this.options && this.options.standalone);
}
_setUpStandalone() {
setUpControl(this.control, this, this.callSetDisabledState);
this.control.updateValueAndValidity({ emitEvent: false });
}
_checkForErrors() {
if (!this._isStandalone()) {
this._checkParentType();
}
this._checkName();
}
_checkParentType() {
if (typeof ngDevMode === 'undefined' || ngDevMode) {
if (!(this._parent instanceof NgModelGroup) &&
this._parent instanceof AbstractFormGroupDirective) {
throw formGroupNameException();
}
else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) {
throw modelParentException();
}
}
}
_checkName() {
if (this.options && this.options.name)
this.name = this.options.name;
if (!this._isStandalone() && !this.name && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw missingNameException();
}
}
_updateValue(value) {
resolvedPromise.then(() => {
this.control.setValue(value, { emitViewToModelChange: false });
this._changeDetectorRef?.markForCheck();
});
}
_updateDisabled(changes) {
const disabledValue = changes['isDisabled'].currentValue;
// checking for 0 to avoid breaking change
const isDisabled = disabledValue !== 0 && booleanAttribute(disabledValue);
resolvedPromise.then(() => {
if (isDisabled && !this.control.disabled) {
this.control.disable();
}
else if (!isDisabled && this.control.disabled) {
this.control.enable();
}
this._changeDetectorRef?.markForCheck();
});
}
_getPath(controlName) {
return this._parent ? controlPath(controlName, this._parent) : [controlName];
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: NgModel, deps: [{ token: i1.ControlContainer, host: true, optional: true }, { token: NG_VALIDATORS, optional: true, self: true }, { token: NG_ASYNC_VALIDATORS, optional: true, self: true }, { token: NG_VALUE_ACCESSOR, optional: true, self: true }, { token: ChangeDetectorRef, optional: true }, { token: CALL_SET_DISABLED_STATE, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.3.5", type: NgModel, selector: "[ngModel]:not([formControlName]):not([formControl])", inputs: { name: "name", isDisabled: ["disabled", "isDisabled"], model: ["ngModel", "model"], options: ["ngModelOptions", "options"] }, outputs: { update: "ngModelChange" }, providers: [formControlBinding], exportAs: ["ngModel"], usesInheritance: true, usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: NgModel, decorators: [{
type: Directive,
args: [{
selector: '[ngModel]:not([formControlName]):not([formControl])',
providers: [formControlBinding],
exportAs: 'ngModel'
}]
}], ctorParameters: () => [{ type: i1.ControlContainer, decorators: [{
type: Optional
}, {
type: Host
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Self
}, {
type: Inject,
args: [NG_VALIDATORS]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Self
}, {
type: Inject,
args: [NG_ASYNC_VALIDATORS]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Self
}, {
type: Inject,
args: [NG_VALUE_ACCESSOR]
}] }, { type: i0.ChangeDetectorRef, decorators: [{
type: Optional
}, {
type: Inject,
args: [ChangeDetectorRef]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [CALL_SET_DISABLED_STATE]
}] }], propDecorators: { name: [{
type: Input
}], isDisabled: [{
type: Input,
args: ['disabled']
}], model: [{
type: Input,
args: ['ngModel']
}], options: [{
type: Input,
args: ['ngModelOptions']
}], update: [{
type: Output,
args: ['ngModelChange']
}] } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {booleanAttribute, ChangeDetectorRef, Directive, EventEmitter, forwardRef, Host, Inject, Input, OnChanges, OnDestroy, Optional, Output, Provider, Self, SimpleChanges} from '@angular/core';\n\nimport {FormHooks} from '../model/abstract_model';\nimport {FormControl} from '../model/form_control';\nimport {NG_ASYNC_VALIDATORS, NG_VALIDATORS} from '../validators';\n\nimport {AbstractFormGroupDirective} from './abstract_form_group_directive';\nimport {ControlContainer} from './control_container';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';\nimport {NgControl} from './ng_control';\nimport {NgForm} from './ng_form';\nimport {NgModelGroup} from './ng_model_group';\nimport {CALL_SET_DISABLED_STATE, controlPath, isPropertyUpdated, selectValueAccessor, SetDisabledStateOption, setUpControl} from './shared';\nimport {formGroupNameException, missingNameException, modelParentException} from './template_driven_errors';\nimport {AsyncValidator, AsyncValidatorFn, Validator, ValidatorFn} from './validators';\n\nconst formControlBinding: Provider = {\n  provide: NgControl,\n  useExisting: forwardRef(() => NgModel)\n};\n\n/**\n * `ngModel` forces an additional change detection run when its inputs change:\n * E.g.:\n * ```\n * <div>{{myModel.valid}}</div>\n * <input [(ngModel)]=\"myValue\" #myModel=\"ngModel\">\n * ```\n * I.e. `ngModel` can export itself on the element and then be used in the template.\n * Normally, this would result in expressions before the `input` that use the exported directive\n * to have an old value as they have been\n * dirty checked before. As this is a very common case for `ngModel`, we added this second change\n * detection run.\n *\n * Notes:\n * - this is just one extra run no matter how many `ngModel`s have been changed.\n * - this is a general problem when using `exportAs` for directives!\n */\nconst resolvedPromise = (() => Promise.resolve())();\n\n/**\n * @description\n * Creates a `FormControl` instance from a [domain\n * model](https://en.wikipedia.org/wiki/Domain_model) and binds it to a form control element.\n *\n * The `FormControl` instance tracks the value, user interaction, and\n * validation status of the control and keeps the view synced with the model. If used\n * within a parent form, the directive also registers itself with the form as a child\n * control.\n *\n * This directive is used by itself or as part of a larger form. Use the\n * `ngModel` selector to activate it.\n *\n * It accepts a domain model as an optional `Input`. If you have a one-way binding\n * to `ngModel` with `[]` syntax, changing the domain model's value in the component\n * class sets the value in the view. If you have a two-way binding with `[()]` syntax\n * (also known as 'banana-in-a-box syntax'), the value in the UI always syncs back to\n * the domain model in your class.\n *\n * To inspect the properties of the associated `FormControl` (like the validity state),\n * export the directive into a local template variable using `ngModel` as the key (ex:\n * `#myVar=\"ngModel\"`). You can then access the control using the directive's `control` property.\n * However, the most commonly used properties (like `valid` and `dirty`) also exist on the control\n * for direct access. See a full list of properties directly available in\n * `AbstractControlDirective`.\n *\n * @see {@link RadioControlValueAccessor}\n * @see {@link SelectControlValueAccessor}\n *\n * @usageNotes\n *\n * ### Using ngModel on a standalone control\n *\n * The following examples show a simple standalone control using `ngModel`:\n *\n * {@example forms/ts/simpleNgModel/simple_ng_model_example.ts region='Component'}\n *\n * When using the `ngModel` within `<form>` tags, you'll also need to supply a `name` attribute\n * so that the control can be registered with the parent form under that name.\n *\n * In the context of a parent form, it's often unnecessary to include one-way or two-way binding,\n * as the parent form syncs the value for you. You access its properties by exporting it into a\n * local template variable using `ngForm` such as (`#f=\"ngForm\"`). Use the variable where\n * needed on form submission.\n *\n * If you do need to populate initial values into your form, using a one-way binding for\n * `ngModel` tends to be sufficient as long as you use the exported form's value rather\n * than the domain model's value on submit.\n *\n * ### Using ngModel within a form\n *\n * The following example shows controls using `ngModel` within a form:\n *\n * {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}\n *\n * ### Using a standalone ngModel within a group\n *\n * The following example shows you how to use a standalone ngModel control\n * within a form. This controls the display of the form, but doesn't contain form data.\n *\n * ```html\n * <form>\n *   <input name=\"login\" ngModel placeholder=\"Login\">\n *   <input type=\"checkbox\" ngModel [ngModelOptions]=\"{standalone: true}\"> Show more options?\n * </form>\n * <!-- form value: {login: ''} -->\n * ```\n *\n * ### Setting the ngModel `name` attribute through options\n *\n * The following example shows you an alternate way to set the name attribute. Here,\n * an attribute identified as name is used within a custom form control component. To still be able\n * to specify the NgModel's name, you must specify it using the `ngModelOptions` input instead.\n *\n * ```html\n * <form>\n *   <my-custom-form-control name=\"Nancy\" ngModel [ngModelOptions]=\"{name: 'user'}\">\n *   </my-custom-form-control>\n * </form>\n * <!-- form value: {user: ''} -->\n * ```\n *\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector: '[ngModel]:not([formControlName]):not([formControl])',\n  providers: [formControlBinding],\n  exportAs: 'ngModel'\n})\nexport class NgModel extends NgControl implements OnChanges, OnDestroy {\n  public override readonly control: FormControl = new FormControl();\n\n  // At runtime we coerce arbitrary values assigned to the \"disabled\" input to a \"boolean\".\n  // This is not reflected in the type of the property because outside of templates, consumers\n  // should only deal with booleans. In templates, a string is allowed for convenience and to\n  // match the native \"disabled attribute\" semantics which can be observed on input elements.\n  // This static member tells the compiler that values of type \"string\" can also be assigned\n  // to the input in a template.\n  /** @nodoc */\n  static ngAcceptInputType_isDisabled: boolean|string;\n\n  /** @internal */\n  _registered = false;\n\n  /**\n   * Internal reference to the view model value.\n   * @nodoc\n   */\n  viewModel: any;\n\n  /**\n   * @description\n   * Tracks the name bound to the directive. If a parent form exists, it\n   * uses this name as a key to retrieve this control's value.\n   */\n  @Input() override name: string = '';\n\n  /**\n   * @description\n   * Tracks whether the control is disabled.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input('disabled') isDisabled!: boolean;\n\n  /**\n   * @description\n   * Tracks the value bound to this directive.\n   */\n  @Input('ngModel') model: any;\n\n  /**\n   * @description\n   * Tracks the configuration options for this `ngModel` instance.\n   *\n   * **name**: An alternative to setting the name attribute on the form control element. See\n   * the [example](api/forms/NgModel#using-ngmodel-on-a-standalone-control) for using `NgModel`\n   * as a standalone control.\n   *\n   * **standalone**: When set to true, the `ngModel` will not register itself with its parent form,\n   * and acts as if it's not in the form. Defaults to false. If no parent form exists, this option\n   * has no effect.\n   *\n   * **updateOn**: Defines the event upon which the form control value and validity update.\n   * Defaults to 'change'. Possible values: `'change'` | `'blur'` | `'submit'`.\n   *\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input('ngModelOptions') options!: {name?: string, standalone?: boolean, updateOn?: FormHooks};\n\n  /**\n   * @description\n   * Event emitter for producing the `ngModelChange` event after\n   * the view model updates.\n   */\n  @Output('ngModelChange') update = new EventEmitter();\n\n  constructor(\n      @Optional() @Host() parent: ControlContainer,\n      @Optional() @Self() @Inject(NG_VALIDATORS) validators: (Validator|ValidatorFn)[],\n      @Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) asyncValidators:\n          (AsyncValidator|AsyncValidatorFn)[],\n      @Optional() @Self() @Inject(NG_VALUE_ACCESSOR) valueAccessors: ControlValueAccessor[],\n      @Optional() @Inject(ChangeDetectorRef) private _changeDetectorRef?: ChangeDetectorRef|null,\n      @Optional() @Inject(CALL_SET_DISABLED_STATE) private callSetDisabledState?:\n          SetDisabledStateOption) {\n    super();\n    this._parent = parent;\n    this._setValidators(validators);\n    this._setAsyncValidators(asyncValidators);\n    this.valueAccessor = selectValueAccessor(this, valueAccessors);\n  }\n\n  /** @nodoc */\n  ngOnChanges(changes: SimpleChanges) {\n    this._checkForErrors();\n    if (!this._registered || 'name' in changes) {\n      if (this._registered) {\n        this._checkName();\n        if (this.formDirective) {\n          // We can't call `formDirective.removeControl(this)`, because the `name` has already been\n          // changed. We also can't reset the name temporarily since the logic in `removeControl`\n          // is inside a promise and it won't run immediately. We work around it by giving it an\n          // object with the same shape instead.\n          const oldName = changes['name'].previousValue;\n          this.formDirective.removeControl({name: oldName, path: this._getPath(oldName)});\n        }\n      }\n      this._setUpControl();\n    }\n    if ('isDisabled' in changes) {\n      this._updateDisabled(changes);\n    }\n\n    if (isPropertyUpdated(changes, this.viewModel)) {\n      this._updateValue(this.model);\n      this.viewModel = this.model;\n    }\n  }\n\n  /** @nodoc */\n  ngOnDestroy(): void {\n    this.formDirective && this.formDirective.removeControl(this);\n  }\n\n  /**\n   * @description\n   * Returns an array that represents the path from the top-level form to this control.\n   * Each index is the string name of the control on that level.\n   */\n  override get path(): string[] {\n    return this._getPath(this.name);\n  }\n\n  /**\n   * @description\n   * The top-level directive for this control if present, otherwise null.\n   */\n  get formDirective(): any {\n    return this._parent ? this._parent.formDirective : null;\n  }\n\n  /**\n   * @description\n   * Sets the new value for the view model and emits an `ngModelChange` event.\n   *\n   * @param newValue The new value emitted by `ngModelChange`.\n   */\n  override viewToModelUpdate(newValue: any): void {\n    this.viewModel = newValue;\n    this.update.emit(newValue);\n  }\n\n  private _setUpControl(): void {\n    this._setUpdateStrategy();\n    this._isStandalone() ? this._setUpStandalone() : this.formDirective.addControl(this);\n    this._registered = true;\n  }\n\n  private _setUpdateStrategy(): void {\n    if (this.options && this.options.updateOn != null) {\n      this.control._updateOn = this.options.updateOn;\n    }\n  }\n\n  private _isStandalone(): boolean {\n    return !this._parent || !!(this.options && this.options.standalone);\n  }\n\n  private _setUpStandalone(): void {\n    setUpControl(this.control, this, this.callSetDisabledState);\n    this.control.updateValueAndValidity({emitEvent: false});\n  }\n\n  private _checkForErrors(): void {\n    if (!this._isStandalone()) {\n      this._checkParentType();\n    }\n    this._checkName();\n  }\n\n  private _checkParentType(): void {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (!(this._parent instanceof NgModelGroup) &&\n          this._parent instanceof AbstractFormGroupDirective) {\n        throw formGroupNameException();\n      } else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) {\n        throw modelParentException();\n      }\n    }\n  }\n\n  private _checkName(): void {\n    if (this.options && this.options.name) this.name = this.options.name;\n\n    if (!this._isStandalone() && !this.name && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw missingNameException();\n    }\n  }\n\n  private _updateValue(value: any): void {\n    resolvedPromise.then(() => {\n      this.control.setValue(value, {emitViewToModelChange: false});\n      this._changeDetectorRef?.markForCheck();\n    });\n  }\n\n  private _updateDisabled(changes: SimpleChanges) {\n    const disabledValue = changes['isDisabled'].currentValue;\n    // checking for 0 to avoid breaking change\n    const isDisabled = disabledValue !== 0 && booleanAttribute(disabledValue);\n\n    resolvedPromise.then(() => {\n      if (isDisabled && !this.control.disabled) {\n        this.control.disable();\n      } else if (!isDisabled && this.control.disabled) {\n        this.control.enable();\n      }\n\n      this._changeDetectorRef?.markForCheck();\n    });\n  }\n\n  private _getPath(controlName: string): string[] {\n    return this._parent ? controlPath(controlName, this._parent) : [controlName];\n  }\n}\n"]}