@angular/forms
Version:
Angular - directives and services for creating forms
220 lines • 23.6 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, Host, Input, Optional, Renderer2, ɵRuntimeError as RuntimeError } from '@angular/core';
import { BuiltInControlValueAccessor, NG_VALUE_ACCESSOR } from './control_value_accessor';
import * as i0 from "@angular/core";
const SELECT_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => SelectControlValueAccessor),
multi: true
};
function _buildValueString(id, value) {
if (id == null)
return `${value}`;
if (value && typeof value === 'object')
value = 'Object';
return `${id}: ${value}`.slice(0, 50);
}
function _extractId(valueString) {
return valueString.split(':')[0];
}
/**
* @description
* The `ControlValueAccessor` for writing select control values and listening to select control
* changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and
* `NgModel` directives.
*
* @usageNotes
*
* ### Using select controls in a reactive form
*
* The following examples show how to use a select control in a reactive form.
*
* {@example forms/ts/reactiveSelectControl/reactive_select_control_example.ts region='Component'}
*
* ### Using select controls in a template-driven form
*
* To use a select in a template-driven form, simply add an `ngModel` and a `name`
* attribute to the main `<select>` tag.
*
* {@example forms/ts/selectControl/select_control_example.ts region='Component'}
*
* ### Customizing option selection
*
* Angular uses object identity to select option. It's possible for the identities of items
* to change while the data does not. This can happen, for example, if the items are produced
* from an RPC to the server, and that RPC is re-run. Even if the data hasn't changed, the
* second response will produce objects with different identities.
*
* To customize the default option comparison algorithm, `<select>` supports `compareWith` input.
* `compareWith` takes a **function** which has two arguments: `option1` and `option2`.
* If `compareWith` is given, Angular selects option by the return value of the function.
*
* ```ts
* const selectedCountriesControl = new FormControl();
* ```
*
* ```
* <select [compareWith]="compareFn" [formControl]="selectedCountriesControl">
* <option *ngFor="let country of countries" [ngValue]="country">
* {{country.name}}
* </option>
* </select>
*
* compareFn(c1: Country, c2: Country): boolean {
* return c1 && c2 ? c1.id === c2.id : c1 === c2;
* }
* ```
*
* **Note:** We listen to the 'change' event because 'input' events aren't fired
* for selects in IE, see:
* https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/input_event#browser_compatibility
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class SelectControlValueAccessor extends BuiltInControlValueAccessor {
constructor() {
super(...arguments);
/** @internal */
this._optionMap = new Map();
/** @internal */
this._idCounter = 0;
this._compareWith = Object.is;
}
/**
* @description
* Tracks the option comparison algorithm for tracking identities when
* checking for changes.
*/
set compareWith(fn) {
if (typeof fn !== 'function' && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw new RuntimeError(1201 /* RuntimeErrorCode.COMPAREWITH_NOT_A_FN */, `compareWith must be a function, but received ${JSON.stringify(fn)}`);
}
this._compareWith = fn;
}
/**
* Sets the "value" property on the select element.
* @nodoc
*/
writeValue(value) {
this.value = value;
const id = this._getOptionId(value);
const valueString = _buildValueString(id, value);
this.setProperty('value', valueString);
}
/**
* Registers a function called when the control value changes.
* @nodoc
*/
registerOnChange(fn) {
this.onChange = (valueString) => {
this.value = this._getOptionValue(valueString);
fn(this.value);
};
}
/** @internal */
_registerOption() {
return (this._idCounter++).toString();
}
/** @internal */
_getOptionId(value) {
for (const id of Array.from(this._optionMap.keys())) {
if (this._compareWith(this._optionMap.get(id), value))
return id;
}
return null;
}
/** @internal */
_getOptionValue(valueString) {
const id = _extractId(valueString);
return this._optionMap.has(id) ? this._optionMap.get(id) : valueString;
}
}
SelectControlValueAccessor.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.3", ngImport: i0, type: SelectControlValueAccessor, deps: null, target: i0.ɵɵFactoryTarget.Directive });
SelectControlValueAccessor.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.2.3", type: SelectControlValueAccessor, selector: "select:not([multiple])[formControlName],select:not([multiple])[formControl],select:not([multiple])[ngModel]", inputs: { compareWith: "compareWith" }, host: { listeners: { "change": "onChange($event.target.value)", "blur": "onTouched()" } }, providers: [SELECT_VALUE_ACCESSOR], usesInheritance: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.3", ngImport: i0, type: SelectControlValueAccessor, decorators: [{
type: Directive,
args: [{
selector: 'select:not([multiple])[formControlName],select:not([multiple])[formControl],select:not([multiple])[ngModel]',
host: { '(change)': 'onChange($event.target.value)', '(blur)': 'onTouched()' },
providers: [SELECT_VALUE_ACCESSOR]
}]
}], propDecorators: { compareWith: [{
type: Input
}] } });
/**
* @description
* Marks `<option>` as dynamic, so Angular can be notified when options change.
*
* @see `SelectControlValueAccessor`
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class NgSelectOption {
constructor(_element, _renderer, _select) {
this._element = _element;
this._renderer = _renderer;
this._select = _select;
if (this._select)
this.id = this._select._registerOption();
}
/**
* @description
* Tracks the value bound to the option element. Unlike the value binding,
* ngValue supports binding to objects.
*/
set ngValue(value) {
if (this._select == null)
return;
this._select._optionMap.set(this.id, value);
this._setElementValue(_buildValueString(this.id, value));
this._select.writeValue(this._select.value);
}
/**
* @description
* Tracks simple string values bound to the option element.
* For objects, use the `ngValue` input binding.
*/
set value(value) {
this._setElementValue(value);
if (this._select)
this._select.writeValue(this._select.value);
}
/** @internal */
_setElementValue(value) {
this._renderer.setProperty(this._element.nativeElement, 'value', value);
}
/** @nodoc */
ngOnDestroy() {
if (this._select) {
this._select._optionMap.delete(this.id);
this._select.writeValue(this._select.value);
}
}
}
NgSelectOption.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.3", ngImport: i0, type: NgSelectOption, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }, { token: SelectControlValueAccessor, host: true, optional: true }], target: i0.ɵɵFactoryTarget.Directive });
NgSelectOption.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.2.3", type: NgSelectOption, selector: "option", inputs: { ngValue: "ngValue", value: "value" }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.3", ngImport: i0, type: NgSelectOption, decorators: [{
type: Directive,
args: [{ selector: 'option' }]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.Renderer2 }, { type: SelectControlValueAccessor, decorators: [{
type: Optional
}, {
type: Host
}] }]; }, propDecorators: { ngValue: [{
type: Input,
args: ['ngValue']
}], value: [{
type: Input,
args: ['value']
}] } });
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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, ElementRef, forwardRef, Host, Input, OnDestroy, Optional, Provider, Renderer2, ɵRuntimeError as RuntimeError} from '@angular/core';\n\nimport {RuntimeErrorCode} from '../errors';\n\nimport {BuiltInControlValueAccessor, ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';\n\nconst SELECT_VALUE_ACCESSOR: Provider = {\n  provide: NG_VALUE_ACCESSOR,\n  useExisting: forwardRef(() => SelectControlValueAccessor),\n  multi: true\n};\n\nfunction _buildValueString(id: string|null, value: any): string {\n  if (id == null) return `${value}`;\n  if (value && typeof value === 'object') value = 'Object';\n  return `${id}: ${value}`.slice(0, 50);\n}\n\nfunction _extractId(valueString: string): string {\n  return valueString.split(':')[0];\n}\n\n/**\n * @description\n * The `ControlValueAccessor` for writing select control values and listening to select control\n * changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and\n * `NgModel` directives.\n *\n * @usageNotes\n *\n * ### Using select controls in a reactive form\n *\n * The following examples show how to use a select control in a reactive form.\n *\n * {@example forms/ts/reactiveSelectControl/reactive_select_control_example.ts region='Component'}\n *\n * ### Using select controls in a template-driven form\n *\n * To use a select in a template-driven form, simply add an `ngModel` and a `name`\n * attribute to the main `<select>` tag.\n *\n * {@example forms/ts/selectControl/select_control_example.ts region='Component'}\n *\n * ### Customizing option selection\n *\n * Angular uses object identity to select option. It's possible for the identities of items\n * to change while the data does not. This can happen, for example, if the items are produced\n * from an RPC to the server, and that RPC is re-run. Even if the data hasn't changed, the\n * second response will produce objects with different identities.\n *\n * To customize the default option comparison algorithm, `<select>` supports `compareWith` input.\n * `compareWith` takes a **function** which has two arguments: `option1` and `option2`.\n * If `compareWith` is given, Angular selects option by the return value of the function.\n *\n * ```ts\n * const selectedCountriesControl = new FormControl();\n * ```\n *\n * ```\n * <select [compareWith]=\"compareFn\"  [formControl]=\"selectedCountriesControl\">\n *     <option *ngFor=\"let country of countries\" [ngValue]=\"country\">\n *         {{country.name}}\n *     </option>\n * </select>\n *\n * compareFn(c1: Country, c2: Country): boolean {\n *     return c1 && c2 ? c1.id === c2.id : c1 === c2;\n * }\n * ```\n *\n * **Note:** We listen to the 'change' event because 'input' events aren't fired\n * for selects in IE, see:\n * https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/input_event#browser_compatibility\n *\n * @ngModule ReactiveFormsModule\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector:\n      'select:not([multiple])[formControlName],select:not([multiple])[formControl],select:not([multiple])[ngModel]',\n  host: {'(change)': 'onChange($event.target.value)', '(blur)': 'onTouched()'},\n  providers: [SELECT_VALUE_ACCESSOR]\n})\nexport class SelectControlValueAccessor extends BuiltInControlValueAccessor implements\n    ControlValueAccessor {\n  /** @nodoc */\n  value: any;\n\n  /** @internal */\n  _optionMap: Map<string, any> = new Map<string, any>();\n\n  /** @internal */\n  _idCounter: number = 0;\n\n  /**\n   * @description\n   * Tracks the option comparison algorithm for tracking identities when\n   * checking for changes.\n   */\n  @Input()\n  set compareWith(fn: (o1: any, o2: any) => boolean) {\n    if (typeof fn !== 'function' && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw new RuntimeError(\n          RuntimeErrorCode.COMPAREWITH_NOT_A_FN,\n          `compareWith must be a function, but received ${JSON.stringify(fn)}`);\n    }\n    this._compareWith = fn;\n  }\n\n  private _compareWith: (o1: any, o2: any) => boolean = Object.is;\n\n  /**\n   * Sets the \"value\" property on the select element.\n   * @nodoc\n   */\n  writeValue(value: any): void {\n    this.value = value;\n    const id: string|null = this._getOptionId(value);\n    const valueString = _buildValueString(id, value);\n    this.setProperty('value', valueString);\n  }\n\n  /**\n   * Registers a function called when the control value changes.\n   * @nodoc\n   */\n  override registerOnChange(fn: (value: any) => any): void {\n    this.onChange = (valueString: string) => {\n      this.value = this._getOptionValue(valueString);\n      fn(this.value);\n    };\n  }\n\n  /** @internal */\n  _registerOption(): string {\n    return (this._idCounter++).toString();\n  }\n\n  /** @internal */\n  _getOptionId(value: any): string|null {\n    for (const id of Array.from(this._optionMap.keys())) {\n      if (this._compareWith(this._optionMap.get(id), value)) return id;\n    }\n    return null;\n  }\n\n  /** @internal */\n  _getOptionValue(valueString: string): any {\n    const id: string = _extractId(valueString);\n    return this._optionMap.has(id) ? this._optionMap.get(id) : valueString;\n  }\n}\n\n/**\n * @description\n * Marks `<option>` as dynamic, so Angular can be notified when options change.\n *\n * @see `SelectControlValueAccessor`\n *\n * @ngModule ReactiveFormsModule\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({selector: 'option'})\nexport class NgSelectOption implements OnDestroy {\n  /**\n   * @description\n   * ID of the option element\n   */\n  // TODO(issue/24571): remove '!'.\n  id!: string;\n\n  constructor(\n      private _element: ElementRef, private _renderer: Renderer2,\n      @Optional() @Host() private _select: SelectControlValueAccessor) {\n    if (this._select) this.id = this._select._registerOption();\n  }\n\n  /**\n   * @description\n   * Tracks the value bound to the option element. Unlike the value binding,\n   * ngValue supports binding to objects.\n   */\n  @Input('ngValue')\n  set ngValue(value: any) {\n    if (this._select == null) return;\n    this._select._optionMap.set(this.id, value);\n    this._setElementValue(_buildValueString(this.id, value));\n    this._select.writeValue(this._select.value);\n  }\n\n  /**\n   * @description\n   * Tracks simple string values bound to the option element.\n   * For objects, use the `ngValue` input binding.\n   */\n  @Input('value')\n  set value(value: any) {\n    this._setElementValue(value);\n    if (this._select) this._select.writeValue(this._select.value);\n  }\n\n  /** @internal */\n  _setElementValue(value: string): void {\n    this._renderer.setProperty(this._element.nativeElement, 'value', value);\n  }\n\n  /** @nodoc */\n  ngOnDestroy(): void {\n    if (this._select) {\n      this._select._optionMap.delete(this.id);\n      this._select.writeValue(this._select.value);\n    }\n  }\n}\n"]}