@angular/forms
Version:
Angular - directives and services for creating forms
310 lines • 32.2 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, EventEmitter, forwardRef, Inject, Input, Optional, Self } from '@angular/core';
import { FormGroup } from '../model/form_group';
import { composeAsyncValidators, composeValidators, NG_ASYNC_VALIDATORS, NG_VALIDATORS } from '../validators';
import { ControlContainer } from './control_container';
import { CALL_SET_DISABLED_STATE, setUpControl, setUpFormContainer, syncPendingControls } from './shared';
import * as i0 from "@angular/core";
const formDirectiveProvider = {
provide: ControlContainer,
useExisting: forwardRef(() => NgForm)
};
const resolvedPromise = (() => Promise.resolve())();
/**
* @description
* Creates a top-level `FormGroup` instance and binds it to a form
* to track aggregate form value and validation status.
*
* As soon as you import the `FormsModule`, this directive becomes active by default on
* all `<form>` tags. You don't need to add a special selector.
*
* You optionally export the directive into a local template variable using `ngForm` as the key
* (ex: `#myForm="ngForm"`). This is optional, but useful. Many properties from the underlying
* `FormGroup` instance are duplicated on the directive itself, so a reference to it
* gives you access to the aggregate value and validity status of the form, as well as
* user interaction properties like `dirty` and `touched`.
*
* To register child controls with the form, use `NgModel` with a `name`
* attribute. You may use `NgModelGroup` to create sub-groups within the form.
*
* If necessary, listen to the directive's `ngSubmit` event to be notified when the user has
* triggered a form submission. The `ngSubmit` event emits the original form
* submission event.
*
* In template driven forms, all `<form>` tags are automatically tagged as `NgForm`.
* To import the `FormsModule` but skip its usage in some forms,
* for example, to use native HTML5 validation, add the `ngNoForm` and the `<form>`
* tags won't create an `NgForm` directive. In reactive forms, using `ngNoForm` is
* unnecessary because the `<form>` tags are inert. In that case, you would
* refrain from using the `formGroup` directive.
*
* @usageNotes
*
* ### Listening for form submission
*
* The following example shows how to capture the form values from the "ngSubmit" event.
*
* {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}
*
* ### Setting the update options
*
* The following example shows you how to change the "updateOn" option from its default using
* ngFormOptions.
*
* ```html
* <form [ngFormOptions]="{updateOn: 'blur'}">
* <input name="one" ngModel> <!-- this ngModel will update on blur -->
* </form>
* ```
*
* ### Native DOM validation UI
*
* In order to prevent the native DOM form validation UI from interfering with Angular's form
* validation, Angular automatically adds the `novalidate` attribute on any `<form>` whenever
* `FormModule` or `ReactiveFormModule` are imported into the application.
* If you want to explicitly enable native DOM validation UI with Angular forms, you can add the
* `ngNativeValidate` attribute to the `<form>` element:
*
* ```html
* <form ngNativeValidate>
* ...
* </form>
* ```
*
* @ngModule FormsModule
* @publicApi
*/
export class NgForm extends ControlContainer {
constructor(validators, asyncValidators, callSetDisabledState) {
super();
this.callSetDisabledState = callSetDisabledState;
/**
* @description
* Returns whether the form submission has been triggered.
*/
this.submitted = false;
this._directives = new Set();
/**
* @description
* Event emitter for the "ngSubmit" event
*/
this.ngSubmit = new EventEmitter();
this.form =
new FormGroup({}, composeValidators(validators), composeAsyncValidators(asyncValidators));
}
/** @nodoc */
ngAfterViewInit() {
this._setUpdateStrategy();
}
/**
* @description
* The directive instance.
*/
get formDirective() {
return this;
}
/**
* @description
* The internal `FormGroup` instance.
*/
get control() {
return this.form;
}
/**
* @description
* Returns an array representing the path to this group. Because this directive
* always lives at the top level of a form, it is always an empty array.
*/
get path() {
return [];
}
/**
* @description
* Returns a map of the controls in this group.
*/
get controls() {
return this.form.controls;
}
/**
* @description
* Method that sets up the control directive in this group, re-calculates its value
* and validity, and adds the instance to the internal list of directives.
*
* @param dir The `NgModel` directive instance.
*/
addControl(dir) {
resolvedPromise.then(() => {
const container = this._findContainer(dir.path);
dir.control =
container.registerControl(dir.name, dir.control);
setUpControl(dir.control, dir, this.callSetDisabledState);
dir.control.updateValueAndValidity({ emitEvent: false });
this._directives.add(dir);
});
}
/**
* @description
* Retrieves the `FormControl` instance from the provided `NgModel` directive.
*
* @param dir The `NgModel` directive instance.
*/
getControl(dir) {
return this.form.get(dir.path);
}
/**
* @description
* Removes the `NgModel` instance from the internal list of directives
*
* @param dir The `NgModel` directive instance.
*/
removeControl(dir) {
resolvedPromise.then(() => {
const container = this._findContainer(dir.path);
if (container) {
container.removeControl(dir.name);
}
this._directives.delete(dir);
});
}
/**
* @description
* Adds a new `NgModelGroup` directive instance to the form.
*
* @param dir The `NgModelGroup` directive instance.
*/
addFormGroup(dir) {
resolvedPromise.then(() => {
const container = this._findContainer(dir.path);
const group = new FormGroup({});
setUpFormContainer(group, dir);
container.registerControl(dir.name, group);
group.updateValueAndValidity({ emitEvent: false });
});
}
/**
* @description
* Removes the `NgModelGroup` directive instance from the form.
*
* @param dir The `NgModelGroup` directive instance.
*/
removeFormGroup(dir) {
resolvedPromise.then(() => {
const container = this._findContainer(dir.path);
if (container) {
container.removeControl(dir.name);
}
});
}
/**
* @description
* Retrieves the `FormGroup` for a provided `NgModelGroup` directive instance
*
* @param dir The `NgModelGroup` directive instance.
*/
getFormGroup(dir) {
return this.form.get(dir.path);
}
/**
* Sets the new value for the provided `NgControl` directive.
*
* @param dir The `NgControl` directive instance.
* @param value The new value for the directive's control.
*/
updateModel(dir, value) {
resolvedPromise.then(() => {
const ctrl = this.form.get(dir.path);
ctrl.setValue(value);
});
}
/**
* @description
* Sets the value for this `FormGroup`.
*
* @param value The new value
*/
setValue(value) {
this.control.setValue(value);
}
/**
* @description
* Method called when the "submit" event is triggered on the form.
* Triggers the `ngSubmit` emitter to emit the "submit" event as its payload.
*
* @param $event The "submit" event object
*/
onSubmit($event) {
this.submitted = true;
syncPendingControls(this.form, this._directives);
this.ngSubmit.emit($event);
// Forms with `method="dialog"` have some special behavior
// that won't reload the page and that shouldn't be prevented.
return $event?.target?.method === 'dialog';
}
/**
* @description
* Method called when the "reset" event is triggered on the form.
*/
onReset() {
this.resetForm();
}
/**
* @description
* Resets the form to an initial value and resets its submitted status.
*
* @param value The new value for the form.
*/
resetForm(value = undefined) {
this.form.reset(value);
this.submitted = false;
}
_setUpdateStrategy() {
if (this.options && this.options.updateOn != null) {
this.form._updateOn = this.options.updateOn;
}
}
_findContainer(path) {
path.pop();
return path.length ? this.form.get(path) : this.form;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: NgForm, deps: [{ token: NG_VALIDATORS, optional: true, self: true }, { token: NG_ASYNC_VALIDATORS, optional: true, self: true }, { token: CALL_SET_DISABLED_STATE, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.3.5", type: NgForm, selector: "form:not([ngNoForm]):not([formGroup]),ng-form,[ngForm]", inputs: { options: ["ngFormOptions", "options"] }, outputs: { ngSubmit: "ngSubmit" }, host: { listeners: { "submit": "onSubmit($event)", "reset": "onReset()" } }, providers: [formDirectiveProvider], exportAs: ["ngForm"], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: NgForm, decorators: [{
type: Directive,
args: [{
selector: 'form:not([ngNoForm]):not([formGroup]),ng-form,[ngForm]',
providers: [formDirectiveProvider],
host: { '(submit)': 'onSubmit($event)', '(reset)': 'onReset()' },
outputs: ['ngSubmit'],
exportAs: 'ngForm'
}]
}], ctorParameters: () => [{ 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: Inject,
args: [CALL_SET_DISABLED_STATE]
}] }], propDecorators: { options: [{
type: Input,
args: ['ngFormOptions']
}] } });
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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 {AfterViewInit, Directive, EventEmitter, forwardRef, Inject, Input, Optional, Provider, Self, ɵWritable as Writable} from '@angular/core';\n\nimport {AbstractControl, FormHooks} from '../model/abstract_model';\nimport {FormControl} from '../model/form_control';\nimport {FormGroup} from '../model/form_group';\nimport {composeAsyncValidators, composeValidators, NG_ASYNC_VALIDATORS, NG_VALIDATORS} from '../validators';\n\nimport {ControlContainer} from './control_container';\nimport {Form} from './form_interface';\nimport {NgControl} from './ng_control';\nimport {NgModel} from './ng_model';\nimport {NgModelGroup} from './ng_model_group';\nimport {CALL_SET_DISABLED_STATE, SetDisabledStateOption, setUpControl, setUpFormContainer, syncPendingControls} from './shared';\nimport {AsyncValidator, AsyncValidatorFn, Validator, ValidatorFn} from './validators';\n\nconst formDirectiveProvider: Provider = {\n  provide: ControlContainer,\n  useExisting: forwardRef(() => NgForm)\n};\n\nconst resolvedPromise = (() => Promise.resolve())();\n\n/**\n * @description\n * Creates a top-level `FormGroup` instance and binds it to a form\n * to track aggregate form value and validation status.\n *\n * As soon as you import the `FormsModule`, this directive becomes active by default on\n * all `<form>` tags.  You don't need to add a special selector.\n *\n * You optionally export the directive into a local template variable using `ngForm` as the key\n * (ex: `#myForm=\"ngForm\"`). This is optional, but useful.  Many properties from the underlying\n * `FormGroup` instance are duplicated on the directive itself, so a reference to it\n * gives you access to the aggregate value and validity status of the form, as well as\n * user interaction properties like `dirty` and `touched`.\n *\n * To register child controls with the form, use `NgModel` with a `name`\n * attribute. You may use `NgModelGroup` to create sub-groups within the form.\n *\n * If necessary, listen to the directive's `ngSubmit` event to be notified when the user has\n * triggered a form submission. The `ngSubmit` event emits the original form\n * submission event.\n *\n * In template driven forms, all `<form>` tags are automatically tagged as `NgForm`.\n * To import the `FormsModule` but skip its usage in some forms,\n * for example, to use native HTML5 validation, add the `ngNoForm` and the `<form>`\n * tags won't create an `NgForm` directive. In reactive forms, using `ngNoForm` is\n * unnecessary because the `<form>` tags are inert. In that case, you would\n * refrain from using the `formGroup` directive.\n *\n * @usageNotes\n *\n * ### Listening for form submission\n *\n * The following example shows how to capture the form values from the \"ngSubmit\" event.\n *\n * {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}\n *\n * ### Setting the update options\n *\n * The following example shows you how to change the \"updateOn\" option from its default using\n * ngFormOptions.\n *\n * ```html\n * <form [ngFormOptions]=\"{updateOn: 'blur'}\">\n *    <input name=\"one\" ngModel>  <!-- this ngModel will update on blur -->\n * </form>\n * ```\n *\n * ### Native DOM validation UI\n *\n * In order to prevent the native DOM form validation UI from interfering with Angular's form\n * validation, Angular automatically adds the `novalidate` attribute on any `<form>` whenever\n * `FormModule` or `ReactiveFormModule` are imported into the application.\n * If you want to explicitly enable native DOM validation UI with Angular forms, you can add the\n * `ngNativeValidate` attribute to the `<form>` element:\n *\n * ```html\n * <form ngNativeValidate>\n *   ...\n * </form>\n * ```\n *\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector: 'form:not([ngNoForm]):not([formGroup]),ng-form,[ngForm]',\n  providers: [formDirectiveProvider],\n  host: {'(submit)': 'onSubmit($event)', '(reset)': 'onReset()'},\n  outputs: ['ngSubmit'],\n  exportAs: 'ngForm'\n})\nexport class NgForm extends ControlContainer implements Form, AfterViewInit {\n  /**\n   * @description\n   * Returns whether the form submission has been triggered.\n   */\n  public readonly submitted: boolean = false;\n\n  private _directives = new Set<NgModel>();\n\n  /**\n   * @description\n   * The `FormGroup` instance created for this form.\n   */\n  form: FormGroup;\n\n  /**\n   * @description\n   * Event emitter for the \"ngSubmit\" event\n   */\n  ngSubmit = new EventEmitter();\n\n  /**\n   * @description\n   * Tracks options for the `NgForm` instance.\n   *\n   * **updateOn**: Sets the default `updateOn` value for all child `NgModels` below it\n   * unless explicitly set by a child `NgModel` using `ngModelOptions`). Defaults to 'change'.\n   * Possible values: `'change'` | `'blur'` | `'submit'`.\n   *\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input('ngFormOptions') options!: {updateOn?: FormHooks};\n\n  constructor(\n      @Optional() @Self() @Inject(NG_VALIDATORS) validators: (Validator|ValidatorFn)[],\n      @Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) asyncValidators:\n          (AsyncValidator|AsyncValidatorFn)[],\n      @Optional() @Inject(CALL_SET_DISABLED_STATE) private callSetDisabledState?:\n          SetDisabledStateOption) {\n    super();\n    this.form =\n        new FormGroup({}, composeValidators(validators), composeAsyncValidators(asyncValidators));\n  }\n\n  /** @nodoc */\n  ngAfterViewInit() {\n    this._setUpdateStrategy();\n  }\n\n  /**\n   * @description\n   * The directive instance.\n   */\n  override get formDirective(): Form {\n    return this;\n  }\n\n  /**\n   * @description\n   * The internal `FormGroup` instance.\n   */\n  override get control(): FormGroup {\n    return this.form;\n  }\n\n  /**\n   * @description\n   * Returns an array representing the path to this group. Because this directive\n   * always lives at the top level of a form, it is always an empty array.\n   */\n  override get path(): string[] {\n    return [];\n  }\n\n  /**\n   * @description\n   * Returns a map of the controls in this group.\n   */\n  get controls(): {[key: string]: AbstractControl} {\n    return this.form.controls;\n  }\n\n  /**\n   * @description\n   * Method that sets up the control directive in this group, re-calculates its value\n   * and validity, and adds the instance to the internal list of directives.\n   *\n   * @param dir The `NgModel` directive instance.\n   */\n  addControl(dir: NgModel): void {\n    resolvedPromise.then(() => {\n      const container = this._findContainer(dir.path);\n      (dir as Writable<NgModel>).control =\n          <FormControl>container.registerControl(dir.name, dir.control);\n      setUpControl(dir.control, dir, this.callSetDisabledState);\n      dir.control.updateValueAndValidity({emitEvent: false});\n      this._directives.add(dir);\n    });\n  }\n\n  /**\n   * @description\n   * Retrieves the `FormControl` instance from the provided `NgModel` directive.\n   *\n   * @param dir The `NgModel` directive instance.\n   */\n  getControl(dir: NgModel): FormControl {\n    return <FormControl>this.form.get(dir.path);\n  }\n\n  /**\n   * @description\n   * Removes the `NgModel` instance from the internal list of directives\n   *\n   * @param dir The `NgModel` directive instance.\n   */\n  removeControl(dir: NgModel): void {\n    resolvedPromise.then(() => {\n      const container = this._findContainer(dir.path);\n      if (container) {\n        container.removeControl(dir.name);\n      }\n      this._directives.delete(dir);\n    });\n  }\n\n  /**\n   * @description\n   * Adds a new `NgModelGroup` directive instance to the form.\n   *\n   * @param dir The `NgModelGroup` directive instance.\n   */\n  addFormGroup(dir: NgModelGroup): void {\n    resolvedPromise.then(() => {\n      const container = this._findContainer(dir.path);\n      const group = new FormGroup({});\n      setUpFormContainer(group, dir);\n      container.registerControl(dir.name, group);\n      group.updateValueAndValidity({emitEvent: false});\n    });\n  }\n\n  /**\n   * @description\n   * Removes the `NgModelGroup` directive instance from the form.\n   *\n   * @param dir The `NgModelGroup` directive instance.\n   */\n  removeFormGroup(dir: NgModelGroup): void {\n    resolvedPromise.then(() => {\n      const container = this._findContainer(dir.path);\n      if (container) {\n        container.removeControl(dir.name);\n      }\n    });\n  }\n\n  /**\n   * @description\n   * Retrieves the `FormGroup` for a provided `NgModelGroup` directive instance\n   *\n   * @param dir The `NgModelGroup` directive instance.\n   */\n  getFormGroup(dir: NgModelGroup): FormGroup {\n    return <FormGroup>this.form.get(dir.path);\n  }\n\n  /**\n   * Sets the new value for the provided `NgControl` directive.\n   *\n   * @param dir The `NgControl` directive instance.\n   * @param value The new value for the directive's control.\n   */\n  updateModel(dir: NgControl, value: any): void {\n    resolvedPromise.then(() => {\n      const ctrl = <FormControl>this.form.get(dir.path!);\n      ctrl.setValue(value);\n    });\n  }\n\n  /**\n   * @description\n   * Sets the value for this `FormGroup`.\n   *\n   * @param value The new value\n   */\n  setValue(value: {[key: string]: any}): void {\n    this.control.setValue(value);\n  }\n\n  /**\n   * @description\n   * Method called when the \"submit\" event is triggered on the form.\n   * Triggers the `ngSubmit` emitter to emit the \"submit\" event as its payload.\n   *\n   * @param $event The \"submit\" event object\n   */\n  onSubmit($event: Event): boolean {\n    (this as Writable<this>).submitted = true;\n    syncPendingControls(this.form, this._directives);\n    this.ngSubmit.emit($event);\n    // Forms with `method=\"dialog\"` have some special behavior\n    // that won't reload the page and that shouldn't be prevented.\n    return ($event?.target as HTMLFormElement | null)?.method === 'dialog';\n  }\n\n  /**\n   * @description\n   * Method called when the \"reset\" event is triggered on the form.\n   */\n  onReset(): void {\n    this.resetForm();\n  }\n\n  /**\n   * @description\n   * Resets the form to an initial value and resets its submitted status.\n   *\n   * @param value The new value for the form.\n   */\n  resetForm(value: any = undefined): void {\n    this.form.reset(value);\n    (this as Writable<this>).submitted = false;\n  }\n\n  private _setUpdateStrategy() {\n    if (this.options && this.options.updateOn != null) {\n      this.form._updateOn = this.options.updateOn;\n    }\n  }\n\n  private _findContainer(path: string[]): FormGroup {\n    path.pop();\n    return path.length ? <FormGroup>this.form.get(path) : this.form;\n  }\n}\n"]}