@angular/forms
Version:
Angular - directives and services for creating forms
124 lines • 14.3 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 { ɵgetDOM as getDOM } from '@angular/common';
import { Directive, ElementRef, forwardRef, Inject, InjectionToken, Optional, Renderer2 } from '@angular/core';
import { BaseControlValueAccessor, NG_VALUE_ACCESSOR } from './control_value_accessor';
import * as i0 from "@angular/core";
export const DEFAULT_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => DefaultValueAccessor),
multi: true
};
/**
* We must check whether the agent is Android because composition events
* behave differently between iOS and Android.
*/
function _isAndroid() {
const userAgent = getDOM() ? getDOM().getUserAgent() : '';
return /android (\d+)/.test(userAgent.toLowerCase());
}
/**
* @description
* Provide this token to control if form directives buffer IME input until
* the "compositionend" event occurs.
* @publicApi
*/
export const COMPOSITION_BUFFER_MODE = new InjectionToken(ngDevMode ? 'CompositionEventMode' : '');
/**
* The default `ControlValueAccessor` for writing a value and listening to changes on input
* elements. The accessor is used by the `FormControlDirective`, `FormControlName`, and
* `NgModel` directives.
*
* {@searchKeywords ngDefaultControl}
*
* @usageNotes
*
* ### Using the default value accessor
*
* The following example shows how to use an input element that activates the default value accessor
* (in this case, a text field).
*
* ```ts
* const firstNameControl = new FormControl();
* ```
*
* ```
* <input type="text" [formControl]="firstNameControl">
* ```
*
* This value accessor is used by default for `<input type="text">` and `<textarea>` elements, but
* you could also use it for custom components that have similar behavior and do not require special
* processing. In order to attach the default value accessor to a custom element, add the
* `ngDefaultControl` attribute as shown below.
*
* ```
* <custom-input-component ngDefaultControl [(ngModel)]="value"></custom-input-component>
* ```
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class DefaultValueAccessor extends BaseControlValueAccessor {
constructor(renderer, elementRef, _compositionMode) {
super(renderer, elementRef);
this._compositionMode = _compositionMode;
/** Whether the user is creating a composition string (IME events). */
this._composing = false;
if (this._compositionMode == null) {
this._compositionMode = !_isAndroid();
}
}
/**
* Sets the "value" property on the input element.
* @nodoc
*/
writeValue(value) {
const normalizedValue = value == null ? '' : value;
this.setProperty('value', normalizedValue);
}
/** @internal */
_handleInput(value) {
if (!this._compositionMode || (this._compositionMode && !this._composing)) {
this.onChange(value);
}
}
/** @internal */
_compositionStart() {
this._composing = true;
}
/** @internal */
_compositionEnd(value) {
this._composing = false;
this._compositionMode && this.onChange(value);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: DefaultValueAccessor, deps: [{ token: i0.Renderer2 }, { token: i0.ElementRef }, { token: COMPOSITION_BUFFER_MODE, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.3.5", type: DefaultValueAccessor, selector: "input:not([type=checkbox])[formControlName],textarea[formControlName],input:not([type=checkbox])[formControl],textarea[formControl],input:not([type=checkbox])[ngModel],textarea[ngModel],[ngDefaultControl]", host: { listeners: { "input": "$any(this)._handleInput($event.target.value)", "blur": "onTouched()", "compositionstart": "$any(this)._compositionStart()", "compositionend": "$any(this)._compositionEnd($event.target.value)" } }, providers: [DEFAULT_VALUE_ACCESSOR], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.5", ngImport: i0, type: DefaultValueAccessor, decorators: [{
type: Directive,
args: [{
selector: 'input:not([type=checkbox])[formControlName],textarea[formControlName],input:not([type=checkbox])[formControl],textarea[formControl],input:not([type=checkbox])[ngModel],textarea[ngModel],[ngDefaultControl]',
// TODO: vsavkin replace the above selector with the one below it once
// https://github.com/angular/angular/issues/3011 is implemented
// selector: '[ngModel],[formControl],[formControlName]',
host: {
'(input)': '$any(this)._handleInput($event.target.value)',
'(blur)': 'onTouched()',
'(compositionstart)': '$any(this)._compositionStart()',
'(compositionend)': '$any(this)._compositionEnd($event.target.value)'
},
providers: [DEFAULT_VALUE_ACCESSOR]
}]
}], ctorParameters: () => [{ type: i0.Renderer2 }, { type: i0.ElementRef }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [COMPOSITION_BUFFER_MODE]
}] }] });
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'CompositionEventMode' : '');\n\n/**\n * The default `ControlValueAccessor` for writing a value and listening to changes on input\n * elements. The accessor is used by the `FormControlDirective`, `FormControlName`, and\n * `NgModel` directives.\n *\n * {@searchKeywords ngDefaultControl}\n *\n * @usageNotes\n *\n * ### Using the default value accessor\n *\n * The following example shows how to use an input element that activates the default value accessor\n * (in this case, a text field).\n *\n * ```ts\n * const firstNameControl = new FormControl();\n * ```\n *\n * ```\n * <input type=\"text\" [formControl]=\"firstNameControl\">\n * ```\n *\n * This value accessor is used by default for `<input type=\"text\">` and `<textarea>` elements, but\n * you could also use it for custom components that have similar behavior and do not require special\n * processing. In order to attach the default value accessor to a custom element, add the\n * `ngDefaultControl` attribute as shown below.\n *\n * ```\n * <custom-input-component ngDefaultControl [(ngModel)]=\"value\"></custom-input-component>\n * ```\n *\n * @ngModule ReactiveFormsModule\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector:\n      'input:not([type=checkbox])[formControlName],textarea[formControlName],input:not([type=checkbox])[formControl],textarea[formControl],input:not([type=checkbox])[ngModel],textarea[ngModel],[ngDefaultControl]',\n  // TODO: vsavkin replace the above selector with the one below it once\n  // https://github.com/angular/angular/issues/3011 is implemented\n  // selector: '[ngModel],[formControl],[formControlName]',\n  host: {\n    '(input)': '$any(this)._handleInput($event.target.value)',\n    '(blur)': 'onTouched()',\n    '(compositionstart)': '$any(this)._compositionStart()',\n    '(compositionend)': '$any(this)._compositionEnd($event.target.value)'\n  },\n  providers: [DEFAULT_VALUE_ACCESSOR]\n})\nexport class DefaultValueAccessor extends BaseControlValueAccessor implements ControlValueAccessor {\n  /** Whether the user is creating a composition string (IME events). */\n  private _composing = false;\n\n  constructor(\n      renderer: Renderer2, elementRef: ElementRef,\n      @Optional() @Inject(COMPOSITION_BUFFER_MODE) private _compositionMode: boolean) {\n    super(renderer, elementRef);\n    if (this._compositionMode == null) {\n      this._compositionMode = !_isAndroid();\n    }\n  }\n\n  /**\n   * Sets the \"value\" property on the input element.\n   * @nodoc\n   */\n  writeValue(value: any): void {\n    const normalizedValue = value == null ? '' : value;\n    this.setProperty('value', normalizedValue);\n  }\n\n  /** @internal */\n  _handleInput(value: any): void {\n    if (!this._compositionMode || (this._compositionMode && !this._composing)) {\n      this.onChange(value);\n    }\n  }\n\n  /** @internal */\n  _compositionStart(): void {\n    this._composing = true;\n  }\n\n  /** @internal */\n  _compositionEnd(value: any): void {\n    this._composing = false;\n    this._compositionMode && this.onChange(value);\n  }\n}\n"]}