@angular/forms
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Angular - directives and services for creating forms
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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 } from '@angular/core';
import { NG_VALUE_ACCESSOR } from './control_value_accessor';
export 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 Firefox and IE:
* https://bugzilla.mozilla.org/show_bug.cgi?id=1024350
* https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/4660045/
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class SelectControlValueAccessor {
constructor(_renderer, _elementRef) {
this._renderer = _renderer;
this._elementRef = _elementRef;
/** @internal */
this._optionMap = new Map();
/** @internal */
this._idCounter = 0;
/**
* @description
* The registered callback function called when a change event occurs on the input element.
*/
this.onChange = (_) => { };
/**
* @description
* The registered callback function called when a blur event occurs on the input element.
*/
this.onTouched = () => { };
this._compareWith = Object.is;
}
/**
* @description
* Tracks the option comparison algorithm for tracking identities when
* checking for changes.
*/
set compareWith(fn) {
if (typeof fn !== 'function') {
throw new Error(`compareWith must be a function, but received ${JSON.stringify(fn)}`);
}
this._compareWith = fn;
}
/**
* Sets the "value" property on the input element. The "selectedIndex"
* property is also set if an ID is provided on the option element.
*
* @param value The checked value
*/
writeValue(value) {
this.value = value;
const id = this._getOptionId(value);
if (id == null) {
this._renderer.setProperty(this._elementRef.nativeElement, 'selectedIndex', -1);
}
const valueString = _buildValueString(id, value);
this._renderer.setProperty(this._elementRef.nativeElement, 'value', valueString);
}
/**
* @description
* Registers a function called when the control value changes.
*
* @param fn The callback function
*/
registerOnChange(fn) {
this.onChange = (valueString) => {
this.value = this._getOptionValue(valueString);
fn(this.value);
};
}
/**
* @description
* Registers a function called when the control is touched.
*
* @param fn The callback function
*/
registerOnTouched(fn) {
this.onTouched = fn;
}
/**
* Sets the "disabled" property on the select input element.
*
* @param isDisabled The disabled value
*/
setDisabledState(isDisabled) {
this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
}
/** @internal */
_registerOption() {
return (this._idCounter++).toString();
}
/** @internal */
_getOptionId(value) {
for (const id of Array.from(this._optionMap.keys())) {
if (this._compareWith(this._optionMap.get(id), value))
return id;
}
return null;
}
/** @internal */
_getOptionValue(valueString) {
const id = _extractId(valueString);
return this._optionMap.has(id) ? this._optionMap.get(id) : valueString;
}
}
SelectControlValueAccessor.decorators = [
{ type: Directive, args: [{
selector: 'select:not([multiple])[formControlName],select:not([multiple])[formControl],select:not([multiple])[ngModel]',
host: { '(change)': 'onChange($event.target.value)', '(blur)': 'onTouched()' },
providers: [SELECT_VALUE_ACCESSOR]
},] }
];
SelectControlValueAccessor.ctorParameters = () => [
{ type: Renderer2 },
{ type: ElementRef }
];
SelectControlValueAccessor.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);
}
/**
* @description
* Lifecycle method called before the directive's instance is destroyed. For internal use only.
*/
ngOnDestroy() {
if (this._select) {
this._select._optionMap.delete(this.id);
this._select.writeValue(this._select.value);
}
}
}
NgSelectOption.decorators = [
{ type: Directive, args: [{ selector: 'option' },] }
];
NgSelectOption.ctorParameters = () => [
{ type: ElementRef },
{ type: Renderer2 },
{ type: SelectControlValueAccessor, decorators: [{ type: Optional }, { type: Host }] }
];
NgSelectOption.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, Renderer2, StaticProvider} from '@angular/core';\n\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';\n\nexport const SELECT_VALUE_ACCESSOR: StaticProvider = {\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 Firefox and IE:\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1024350\n * https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/4660045/\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 implements ControlValueAccessor {\n  value: any;\n  /** @internal */\n  _optionMap: Map<string, any> = new Map<string, any>();\n  /** @internal */\n  _idCounter: number = 0;\n\n  /**\n   * @description\n   * The registered callback function called when a change event occurs on the input element.\n   */\n  onChange = (_: any) => {};\n\n  /**\n   * @description\n   * The registered callback function called when a blur event occurs on the input element.\n   */\n  onTouched = () => {};\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') {\n      throw new Error(`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  constructor(private _renderer: Renderer2, private _elementRef: ElementRef) {}\n\n  /**\n   * Sets the \"value\" property on the input element. The \"selectedIndex\"\n   * property is also set if an ID is provided on the option element.\n   *\n   * @param value The checked value\n   */\n  writeValue(value: any): void {\n    this.value = value;\n    const id: string|null = this._getOptionId(value);\n    if (id == null) {\n      this._renderer.setProperty(this._elementRef.nativeElement, 'selectedIndex', -1);\n    }\n    const valueString = _buildValueString(id, value);\n    this._renderer.setProperty(this._elementRef.nativeElement, 'value', valueString);\n  }\n\n  /**\n   * @description\n   * Registers a function called when the control value changes.\n   *\n   * @param fn The callback function\n   */\n  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  /**\n   * @description\n   * Registers a function called when the control is touched.\n   *\n   * @param fn The callback function\n   */\n  registerOnTouched(fn: () => any): void {\n    this.onTouched = fn;\n  }\n\n  /**\n   * Sets the \"disabled\" property on the select input element.\n   *\n   * @param isDisabled The disabled value\n   */\n  setDisabledState(isDisabled: boolean): void {\n    this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);\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  /**\n   * @description\n   * Lifecycle method called before the directive's instance is destroyed. For internal use only.\n   */\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"]}