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@angular/forms

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Angular - directives and services for creating forms

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/** * @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, EventEmitter, forwardRef, Host, Inject, Input, Optional, Output, Self } from '@angular/core'; import { FormControl } from '../model'; 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 { composeAsyncValidators, composeValidators, controlPath, isPropertyUpdated, selectValueAccessor, setUpControl } from './shared'; import { TemplateDrivenErrors } from './template_driven_errors'; export const formControlBinding = { provide: NgControl, useExisting: forwardRef(() => NgModel) }; const ɵ0 = () => Promise.resolve(null); /** * `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 and 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` have been changed. * - this is a general problem when using `exportAs` for directives! */ const resolvedPromise = (ɵ0)(); /** * @description * Creates a `FormControl` instance from a 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 value of the domain model in the component * class sets the value in the view. If you have a two-way binding with `[()]` syntax * (also known as 'banana-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 validity state), * export the directive into a local template variable using `ngModel` as the key (ex: * `#myVar="ngModel"`). You then access the control using the directive's `control` property, but * most properties used (like `valid` and `dirty`) fall through to the control anyway for direct * access. See a full list of properties directly available in `AbstractControlDirective`. * * @see `RadioControlValueAccessor` * @see `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. The name attribute is * used within a custom form component, and the name `@Input` property serves a different purpose. * * ```html * <form> * <my-person-control name="Nancy" ngModel [ngModelOptions]="{name: 'user'}"> * </my-person-control> * </form> * <!-- form value: {user: ''} --> * ``` * * @ngModule FormsModule * @publicApi */ export class NgModel extends NgControl { constructor(parent, validators, asyncValidators, valueAccessors) { super(); this.control = new FormControl(); /** @internal */ this._registered = false; /** * @description * Event emitter for producing the `ngModelChange` event after * the view model updates. */ this.update = new EventEmitter(); this._parent = parent; this._rawValidators = validators || []; this._rawAsyncValidators = asyncValidators || []; this.valueAccessor = selectValueAccessor(this, valueAccessors); } /** * @description * A lifecycle method called when the directive's inputs change. For internal use * only. * * @param changes A object of key/value pairs for the set of changed inputs. */ ngOnChanges(changes) { this._checkForErrors(); if (!this._registered) this._setUpControl(); if ('isDisabled' in changes) { this._updateDisabled(changes); } if (isPropertyUpdated(changes, this.viewModel)) { this._updateValue(this.model); this.viewModel = this.model; } } /** * @description * Lifecycle method called before the directive's instance is destroyed. For internal * use only. */ 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._parent ? controlPath(this.name, this._parent) : [this.name]; } /** * @description * The top-level directive for this control if present, otherwise null. */ get formDirective() { return this._parent ? this._parent.formDirective : null; } /** * @description * Synchronous validator function composed of all the synchronous validators * registered with this directive. */ get validator() { return composeValidators(this._rawValidators); } /** * @description * Async validator function composed of all the async validators registered with this * directive. */ get asyncValidator() { return composeAsyncValidators(this._rawAsyncValidators); } /** * @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.control.updateValueAndValidity({ emitEvent: false }); } _checkForErrors() { if (!this._isStandalone()) { this._checkParentType(); } this._checkName(); } _checkParentType() { if (!(this._parent instanceof NgModelGroup) && this._parent instanceof AbstractFormGroupDirective) { TemplateDrivenErrors.formGroupNameException(); } else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) { TemplateDrivenErrors.modelParentException(); } } _checkName() { if (this.options && this.options.name) this.name = this.options.name; if (!this._isStandalone() && !this.name) { TemplateDrivenErrors.missingNameException(); } } _updateValue(value) { resolvedPromise.then(() => { this.control.setValue(value, { emitViewToModelChange: false }); }); } _updateDisabled(changes) { const disabledValue = changes['isDisabled'].currentValue; const isDisabled = disabledValue === '' || (disabledValue && disabledValue !== 'false'); resolvedPromise.then(() => { if (isDisabled && !this.control.disabled) { this.control.disable(); } else if (!isDisabled && this.control.disabled) { this.control.enable(); } }); } } NgModel.decorators = [ { type: Directive, args: [{ selector: '[ngModel]:not([formControlName]):not([formControl])', providers: [formControlBinding], exportAs: 'ngModel' },] } ]; NgModel.ctorParameters = () => [ { type: ControlContainer, decorators: [{ type: Optional }, { type: Host }] }, { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_VALIDATORS,] }] }, { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_ASYNC_VALIDATORS,] }] }, { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_VALUE_ACCESSOR,] }] } ]; NgModel.propDecorators = { name: [{ type: Input }], isDisabled: [{ type: Input, args: ['disabled',] }], model: [{ type: Input, args: ['ngModel',] }], options: [{ type: Input, args: ['ngModelOptions',] }], update: [{ type: Output, args: ['ngModelChange',] }] }; export { ɵ0 }; //# 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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 {Directive, EventEmitter, forwardRef, Host, Inject, Input, OnChanges, OnDestroy, Optional, Output, Self, SimpleChanges} from '@angular/core';\n\nimport {FormControl, FormHooks} from '../model';\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 {composeAsyncValidators, composeValidators, controlPath, isPropertyUpdated, selectValueAccessor, setUpControl} from './shared';\nimport {TemplateDrivenErrors} from './template_driven_errors';\nimport {AsyncValidator, AsyncValidatorFn, Validator, ValidatorFn} from './validators';\n\nexport const formControlBinding: any = {\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 and 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` have been changed.\n * - this is a general problem when using `exportAs` for directives!\n */\nconst resolvedPromise = (() => Promise.resolve(null))();\n\n/**\n * @description\n * Creates a `FormControl` instance from a domain model and binds it\n * 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 value of the domain model 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-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 validity state),\n * export the directive into a local template variable using `ngModel` as the key (ex:\n * `#myVar=\"ngModel\"`). You then access the control using the directive's `control` property, but\n * most properties used (like `valid` and `dirty`) fall through to the control anyway for direct\n * access. See a full list of properties directly available in `AbstractControlDirective`.\n *\n * @see `RadioControlValueAccessor`\n * @see `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. The name attribute is\n * used within a custom form component, and the name `@Input` property serves a different purpose.\n *\n * ```html\n * <form>\n *   <my-person-control name=\"Nancy\" ngModel [ngModelOptions]=\"{name: 'user'}\">\n *   </my-person-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 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   * @description\n   * Internal reference to the view model value.\n   */\n  viewModel: any;\n\n  /**\n   * @description\n   * Tracks the name bound to the directive. The parent form\n   * uses this name as a key to retrieve this control's value.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() 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.\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: Array<Validator|ValidatorFn>,\n      @Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) asyncValidators:\n          Array<AsyncValidator|AsyncValidatorFn>,\n      @Optional() @Self() @Inject(NG_VALUE_ACCESSOR) valueAccessors: ControlValueAccessor[]) {\n    super();\n    this._parent = parent;\n    this._rawValidators = validators || [];\n    this._rawAsyncValidators = asyncValidators || [];\n    this.valueAccessor = selectValueAccessor(this, valueAccessors);\n  }\n\n  /**\n   * @description\n   * A lifecycle method called when the directive's inputs change. For internal use\n   * only.\n   *\n   * @param changes A object of key/value pairs for the set of changed inputs.\n   */\n  ngOnChanges(changes: SimpleChanges) {\n    this._checkForErrors();\n    if (!this._registered) this._setUpControl();\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  /**\n   * @description\n   * Lifecycle method called before the directive's instance is destroyed. For internal\n   * use only.\n   */\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  get path(): string[] {\n    return this._parent ? controlPath(this.name, this._parent) : [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   * Synchronous validator function composed of all the synchronous validators\n   * registered with this directive.\n   */\n  get validator(): ValidatorFn|null {\n    return composeValidators(this._rawValidators);\n  }\n\n  /**\n   * @description\n   * Async validator function composed of all the async validators registered with this\n   * directive.\n   */\n  get asyncValidator(): AsyncValidatorFn|null {\n    return composeAsyncValidators(this._rawAsyncValidators);\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  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);\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 (!(this._parent instanceof NgModelGroup) &&\n        this._parent instanceof AbstractFormGroupDirective) {\n      TemplateDrivenErrors.formGroupNameException();\n    } else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) {\n      TemplateDrivenErrors.modelParentException();\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) {\n      TemplateDrivenErrors.missingNameException();\n    }\n  }\n\n  private _updateValue(value: any): void {\n    resolvedPromise.then(() => {\n      this.control.setValue(value, {emitViewToModelChange: false});\n    });\n  }\n\n  private _updateDisabled(changes: SimpleChanges) {\n    const disabledValue = changes['isDisabled'].currentValue;\n\n    const isDisabled = disabledValue === '' || (disabledValue && disabledValue !== 'false');\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  }\n}\n"]}