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@ng-bootstrap/ng-bootstrap

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import { ChangeDetectorRef, Directive, ElementRef, EventEmitter, forwardRef, inject, Input, NgZone, Output, } from '@angular/core'; import { NG_VALUE_ACCESSOR } from '@angular/forms'; import { DOCUMENT } from '@angular/common'; import { BehaviorSubject, fromEvent, of, Subject } from 'rxjs'; import { map, switchMap, tap } from 'rxjs/operators'; import { Live } from '../util/accessibility/live'; import { ngbAutoClose } from '../util/autoclose'; import { Key } from '../util/key'; import { PopupService } from '../util/popup'; import { ngbPositioning } from '../util/positioning'; import { isDefined, toString } from '../util/util'; import { NgbTypeaheadConfig } from './typeahead-config'; import { NgbTypeaheadWindow } from './typeahead-window'; import { addPopperOffset } from '../util/positioning-util'; import * as i0 from "@angular/core"; let nextWindowId = 0; /** * A directive providing a simple way of creating powerful typeaheads from any text input. */ export class NgbTypeahead { constructor() { this._nativeElement = inject(ElementRef).nativeElement; this._config = inject(NgbTypeaheadConfig); this._live = inject(Live); this._document = inject(DOCUMENT); this._ngZone = inject(NgZone); this._changeDetector = inject(ChangeDetectorRef); this._popupService = new PopupService(NgbTypeaheadWindow); this._positioning = ngbPositioning(); this._subscription = null; this._closed$ = new Subject(); this._inputValueBackup = null; this._inputValueForSelectOnExact = null; this._valueChanges$ = fromEvent(this._nativeElement, 'input').pipe(map(($event) => $event.target.value)); this._resubscribeTypeahead$ = new BehaviorSubject(null); this._windowRef = null; /** * The value for the `autocomplete` attribute for the `<input>` element. * * Defaults to `"off"` to disable the native browser autocomplete, but you can override it if necessary. * * @since 2.1.0 */ this.autocomplete = 'off'; /** * A selector specifying the element the typeahead popup will be appended to. * * Currently only supports `"body"`. */ this.container = this._config.container; /** * If `true`, model values will not be restricted only to items selected from the popup. */ this.editable = this._config.editable; /** * If `true`, the first item in the result list will always stay focused while typing. */ this.focusFirst = this._config.focusFirst; /** * If `true`, automatically selects the item when it is the only one that exactly matches the user input * * @since 14.2.0 */ this.selectOnExact = this._config.selectOnExact; /** * If `true`, will show the hint in the `<input>` when an item in the result list matches. */ this.showHint = this._config.showHint; /** * The preferred placement of the typeahead, among the [possible values](#/guides/positioning#api). * * The default order of preference is `"bottom-start bottom-end top-start top-end"` * * Please see the [positioning overview](#/positioning) for more details. */ this.placement = this._config.placement; /** * Allows to change default Popper options when positioning the typeahead. * Receives current popper options and returns modified ones. * * @since 13.1.0 */ this.popperOptions = this._config.popperOptions; /** * An event emitted right before an item is selected from the result list. * * Event payload is of type [`NgbTypeaheadSelectItemEvent`](#/components/typeahead/api#NgbTypeaheadSelectItemEvent). */ this.selectItem = new EventEmitter(); this.activeDescendant = null; this.popupId = `ngb-typeahead-${nextWindowId++}`; this._onTouched = () => { }; this._onChange = (_) => { }; } ngOnInit() { this._subscribeToUserInput(); } ngOnChanges({ ngbTypeahead }) { if (ngbTypeahead && !ngbTypeahead.firstChange) { this._unsubscribeFromUserInput(); this._subscribeToUserInput(); } } ngOnDestroy() { this._closePopup(); this._unsubscribeFromUserInput(); } registerOnChange(fn) { this._onChange = fn; } registerOnTouched(fn) { this._onTouched = fn; } writeValue(value) { this._writeInputValue(this._formatItemForInput(value)); if (this.showHint) { this._inputValueBackup = value; } } setDisabledState(isDisabled) { this._nativeElement.disabled = isDisabled; } /** * Dismisses typeahead popup window */ dismissPopup() { if (this.isPopupOpen()) { this._resubscribeTypeahead$.next(null); this._closePopup(); if (this.showHint && this._inputValueBackup !== null) { this._writeInputValue(this._inputValueBackup); } this._changeDetector.markForCheck(); } } /** * Returns true if the typeahead popup window is displayed */ isPopupOpen() { return this._windowRef != null; } handleBlur() { this._resubscribeTypeahead$.next(null); this._onTouched(); } handleKeyDown(event) { if (!this.isPopupOpen()) { return; } /* eslint-disable-next-line deprecation/deprecation */ switch (event.which) { case Key.ArrowDown: event.preventDefault(); this._windowRef.instance.next(); this._showHint(); break; case Key.ArrowUp: event.preventDefault(); this._windowRef.instance.prev(); this._showHint(); break; case Key.Enter: case Key.Tab: { const result = this._windowRef.instance.getActive(); if (isDefined(result)) { event.preventDefault(); event.stopPropagation(); this._selectResult(result); } this._closePopup(); break; } } } _openPopup() { if (!this.isPopupOpen()) { this._inputValueBackup = this._nativeElement.value; const { windowRef } = this._popupService.open(); this._windowRef = windowRef; this._windowRef.setInput('id', this.popupId); this._windowRef.setInput('popupClass', this.popupClass); this._windowRef.instance.selectEvent.subscribe((result) => this._selectResultClosePopup(result)); this._windowRef.instance.activeChangeEvent.subscribe((activeId) => (this.activeDescendant = activeId)); if (this.container === 'body') { this._windowRef.location.nativeElement.style.zIndex = '1055'; this._document.body.appendChild(this._windowRef.location.nativeElement); } this._changeDetector.markForCheck(); // Setting up popper and scheduling updates when zone is stable this._ngZone.runOutsideAngular(() => { if (this._windowRef) { this._positioning.createPopper({ hostElement: this._nativeElement, targetElement: this._windowRef.location.nativeElement, placement: this.placement, appendToBody: this.container === 'body', updatePopperOptions: (options) => this.popperOptions(addPopperOffset([0, 2])(options)), }); this._zoneSubscription = this._ngZone.onStable.subscribe(() => this._positioning.update()); } }); ngbAutoClose(this._ngZone, this._document, 'outside', () => this.dismissPopup(), this._closed$, [ this._nativeElement, this._windowRef.location.nativeElement, ]); } } _closePopup() { this._popupService.close().subscribe(() => { this._positioning.destroy(); this._zoneSubscription?.unsubscribe(); this._closed$.next(); this._windowRef = null; this.activeDescendant = null; }); } _selectResult(result) { let defaultPrevented = false; this.selectItem.emit({ item: result, preventDefault: () => { defaultPrevented = true; }, }); this._resubscribeTypeahead$.next(null); if (!defaultPrevented) { this.writeValue(result); this._onChange(result); } } _selectResultClosePopup(result) { this._selectResult(result); this._closePopup(); } _showHint() { if (this.showHint && this._windowRef?.instance.hasActive() && this._inputValueBackup != null) { const userInputLowerCase = this._inputValueBackup.toLowerCase(); const formattedVal = this._formatItemForInput(this._windowRef.instance.getActive()); if (userInputLowerCase === formattedVal.substring(0, this._inputValueBackup.length).toLowerCase()) { this._writeInputValue(this._inputValueBackup + formattedVal.substring(this._inputValueBackup.length)); this._nativeElement['setSelectionRange'].apply(this._nativeElement, [ this._inputValueBackup.length, formattedVal.length, ]); } else { this._writeInputValue(formattedVal); } } } _formatItemForInput(item) { return item != null && this.inputFormatter ? this.inputFormatter(item) : toString(item); } _writeInputValue(value) { this._nativeElement.value = toString(value); } _subscribeToUserInput() { const results$ = this._valueChanges$.pipe(tap((value) => { this._inputValueBackup = this.showHint ? value : null; this._inputValueForSelectOnExact = this.selectOnExact ? value : null; this._onChange(this.editable ? value : undefined); }), this.ngbTypeahead ? this.ngbTypeahead : () => of([])); this._subscription = this._resubscribeTypeahead$.pipe(switchMap(() => results$)).subscribe((results) => { if (!results || results.length === 0) { this._closePopup(); } else { // when there is only one result and this matches the input value if (this.selectOnExact && results.length === 1 && this._formatItemForInput(results[0]) === this._inputValueForSelectOnExact) { this._selectResult(results[0]); this._closePopup(); } else { this._openPopup(); this._windowRef.setInput('focusFirst', this.focusFirst); this._windowRef.setInput('results', results); this._windowRef.setInput('term', this._nativeElement.value); if (this.resultFormatter) { this._windowRef.setInput('formatter', this.resultFormatter); } if (this.resultTemplate) { this._windowRef.setInput('resultTemplate', this.resultTemplate); } this._windowRef.instance.resetActive(); // The observable stream we are subscribing to might have async steps // and if a component containing typeahead is using the OnPush strategy // the change detection turn wouldn't be invoked automatically. this._windowRef.changeDetectorRef.detectChanges(); this._showHint(); } } // live announcer const count = results ? results.length : 0; this._live.say(count === 0 ? 'No results available' : `${count} result${count === 1 ? '' : 's'} available`); }); } _unsubscribeFromUserInput() { if (this._subscription) { this._subscription.unsubscribe(); } this._subscription = null; } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.0.0", ngImport: i0, type: NgbTypeahead, deps: [], target: i0.ɵɵFactoryTarget.Directive }); } static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.0.0", type: NgbTypeahead, isStandalone: true, selector: "input[ngbTypeahead]", inputs: { autocomplete: "autocomplete", container: "container", editable: "editable", focusFirst: "focusFirst", inputFormatter: "inputFormatter", ngbTypeahead: "ngbTypeahead", resultFormatter: "resultFormatter", resultTemplate: "resultTemplate", selectOnExact: "selectOnExact", showHint: "showHint", placement: "placement", popperOptions: "popperOptions", popupClass: "popupClass" }, outputs: { selectItem: "selectItem" }, host: { attributes: { "autocapitalize": "off", "autocorrect": "off", "role": "combobox" }, listeners: { "blur": "handleBlur()", "keydown": "handleKeyDown($event)" }, properties: { "class.open": "isPopupOpen()", "autocomplete": "autocomplete", "attr.aria-autocomplete": "showHint ? \"both\" : \"list\"", "attr.aria-activedescendant": "activeDescendant", "attr.aria-owns": "isPopupOpen() ? popupId : null", "attr.aria-expanded": "isPopupOpen()" } }, providers: [{ provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgbTypeahead), multi: true }], exportAs: ["ngbTypeahead"], usesOnChanges: true, ngImport: i0 }); } } i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.0.0", ngImport: i0, type: NgbTypeahead, decorators: [{ type: Directive, args: [{ selector: 'input[ngbTypeahead]', exportAs: 'ngbTypeahead', standalone: true, host: { '(blur)': 'handleBlur()', '[class.open]': 'isPopupOpen()', '(keydown)': 'handleKeyDown($event)', '[autocomplete]': 'autocomplete', autocapitalize: 'off', autocorrect: 'off', role: 'combobox', '[attr.aria-autocomplete]': 'showHint ? "both" : "list"', '[attr.aria-activedescendant]': 'activeDescendant', '[attr.aria-owns]': 'isPopupOpen() ? popupId : null', '[attr.aria-expanded]': 'isPopupOpen()', }, providers: [{ provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgbTypeahead), multi: true }], }] }], propDecorators: { autocomplete: [{ type: Input }], container: [{ type: Input }], editable: [{ type: Input }], focusFirst: [{ type: Input }], inputFormatter: [{ type: Input }], ngbTypeahead: [{ type: Input }], resultFormatter: [{ type: Input }], resultTemplate: [{ type: Input }], selectOnExact: [{ type: Input }], showHint: [{ type: Input }], placement: [{ type: Input }], popperOptions: [{ type: Input }], popupClass: [{ type: Input }], selectItem: [{ type: Output }] } }); //# 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{\n\tChangeDetectorRef,\n\tComponentRef,\n\tDirective,\n\tElementRef,\n\tEventEmitter,\n\tforwardRef,\n\tinject,\n\tInput,\n\tNgZone,\n\tOnChanges,\n\tOnDestroy,\n\tOnInit,\n\tOutput,\n\tSimpleChanges,\n\tTemplateRef,\n} from '@angular/core';\nimport { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';\nimport { DOCUMENT } from '@angular/common';\nimport { BehaviorSubject, fromEvent, of, OperatorFunction, Subject, Subscription } from 'rxjs';\nimport { map, switchMap, tap } from 'rxjs/operators';\n\nimport { Live } from '../util/accessibility/live';\nimport { ngbAutoClose } from '../util/autoclose';\nimport { Key } from '../util/key';\nimport { PopupService } from '../util/popup';\nimport { ngbPositioning } from '../util/positioning';\nimport { isDefined, toString } from '../util/util';\n\nimport { NgbTypeaheadConfig } from './typeahead-config';\nimport { NgbTypeaheadWindow, ResultTemplateContext } from './typeahead-window';\nimport { addPopperOffset } from '../util/positioning-util';\n\n/**\n * An event emitted right before an item is selected from the result list.\n */\nexport interface NgbTypeaheadSelectItemEvent<T = any> {\n\t/**\n\t * The item from the result list about to be selected.\n\t */\n\titem: T;\n\n\t/**\n\t * Calling this function will prevent item selection from happening.\n\t */\n\tpreventDefault: () => void;\n}\n\nlet nextWindowId = 0;\n\n/**\n * A directive providing a simple way of creating powerful typeaheads from any text input.\n */\n@Directive({\n\tselector: 'input[ngbTypeahead]',\n\texportAs: 'ngbTypeahead',\n\tstandalone: true,\n\thost: {\n\t\t'(blur)': 'handleBlur()',\n\t\t'[class.open]': 'isPopupOpen()',\n\t\t'(keydown)': 'handleKeyDown($event)',\n\t\t'[autocomplete]': 'autocomplete',\n\t\tautocapitalize: 'off',\n\t\tautocorrect: 'off',\n\t\trole: 'combobox',\n\t\t'[attr.aria-autocomplete]': 'showHint ? \"both\" : \"list\"',\n\t\t'[attr.aria-activedescendant]': 'activeDescendant',\n\t\t'[attr.aria-owns]': 'isPopupOpen() ? popupId : null',\n\t\t'[attr.aria-expanded]': 'isPopupOpen()',\n\t},\n\tproviders: [{ provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgbTypeahead), multi: true }],\n})\nexport class NgbTypeahead implements ControlValueAccessor, OnInit, OnChanges, OnDestroy {\n\tprivate _nativeElement = inject(ElementRef).nativeElement as HTMLInputElement;\n\tprivate _config = inject(NgbTypeaheadConfig);\n\tprivate _live = inject(Live);\n\tprivate _document = inject(DOCUMENT);\n\tprivate _ngZone = inject(NgZone);\n\tprivate _changeDetector = inject(ChangeDetectorRef);\n\n\tprivate _popupService = new PopupService(NgbTypeaheadWindow);\n\tprivate _positioning = ngbPositioning();\n\n\tprivate _subscription: Subscription | null = null;\n\tprivate _closed$ = new Subject<void>();\n\tprivate _inputValueBackup: string | null = null;\n\tprivate _inputValueForSelectOnExact: string | null = null;\n\tprivate _valueChanges$ = fromEvent<Event>(this._nativeElement, 'input').pipe(\n\t\tmap(($event) => ($event.target as HTMLInputElement).value),\n\t);\n\tprivate _resubscribeTypeahead$ = new BehaviorSubject(null);\n\tprivate _windowRef: ComponentRef<NgbTypeaheadWindow> | null = null;\n\tprivate _zoneSubscription: Subscription;\n\n\t/**\n\t * The value for the `autocomplete` attribute for the `<input>` element.\n\t *\n\t * Defaults to `\"off\"` to disable the native browser autocomplete, but you can override it if necessary.\n\t *\n\t * @since 2.1.0\n\t */\n\t@Input() autocomplete = 'off';\n\n\t/**\n\t * A selector specifying the element the typeahead popup will be appended to.\n\t *\n\t * Currently only supports `\"body\"`.\n\t */\n\t@Input() container = this._config.container;\n\n\t/**\n\t * If `true`, model values will not be restricted only to items selected from the popup.\n\t */\n\t@Input() editable = this._config.editable;\n\n\t/**\n\t * If `true`, the first item in the result list will always stay focused while typing.\n\t */\n\t@Input() focusFirst = this._config.focusFirst;\n\n\t/**\n\t * The function that converts an item from the result list to a `string` to display in the `<input>` field.\n\t *\n\t * It is called when the user selects something in the popup or the model value changes, so the input needs to\n\t * be updated.\n\t */\n\t@Input() inputFormatter: (item: any) => string;\n\n\t/**\n\t * The function that converts a stream of text values from the `<input>` element to the stream of the array of items\n\t * to display in the typeahead popup.\n\t *\n\t * If the resulting observable emits a non-empty array - the popup will be shown. If it emits an empty array - the\n\t * popup will be closed.\n\t *\n\t * See the [basic example](#/components/typeahead/examples#basic) for more details.\n\t *\n\t * Note that the `this` argument is `undefined` so you need to explicitly bind it to a desired \"this\" target.\n\t */\n\t@Input() ngbTypeahead: OperatorFunction<string, readonly any[]> | null | undefined;\n\n\t/**\n\t * The function that converts an item from the result list to a `string` to display in the popup.\n\t *\n\t * Must be provided, if your `ngbTypeahead` returns something other than `Observable<string[]>`.\n\t *\n\t * Alternatively for more complex markup in the popup you should use `resultTemplate`.\n\t */\n\t@Input() resultFormatter: (item: any) => string;\n\n\t/**\n\t * The template to override the way resulting items are displayed in the popup.\n\t *\n\t * See the [ResultTemplateContext](#/components/typeahead/api#ResultTemplateContext) for the template context.\n\t *\n\t * Also see the [template for results demo](#/components/typeahead/examples#template) for more details.\n\t */\n\t@Input() resultTemplate: TemplateRef<ResultTemplateContext>;\n\n\t/**\n\t * If `true`, automatically selects the item when it is the only one that exactly matches the user input\n\t *\n\t * @since 14.2.0\n\t */\n\t@Input() selectOnExact = this._config.selectOnExact;\n\n\t/**\n\t * If `true`, will show the hint in the `<input>` when an item in the result list matches.\n\t */\n\t@Input() showHint = this._config.showHint;\n\n\t/**\n\t * The preferred placement of the typeahead, among the [possible values](#/guides/positioning#api).\n\t *\n\t * The default order of preference is `\"bottom-start bottom-end top-start top-end\"`\n\t *\n\t * Please see the [positioning overview](#/positioning) for more details.\n\t */\n\t@Input() placement = this._config.placement;\n\n\t/**\n\t * Allows to change default Popper options when positioning the typeahead.\n\t * Receives current popper options and returns modified ones.\n\t 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SimpleChanges): void {\n\t\tif (ngbTypeahead && !ngbTypeahead.firstChange) {\n\t\t\tthis._unsubscribeFromUserInput();\n\t\t\tthis._subscribeToUserInput();\n\t\t}\n\t}\n\n\tngOnDestroy(): void {\n\t\tthis._closePopup();\n\t\tthis._unsubscribeFromUserInput();\n\t}\n\n\tregisterOnChange(fn: (value: any) => any): void {\n\t\tthis._onChange = fn;\n\t}\n\n\tregisterOnTouched(fn: () => any): void {\n\t\tthis._onTouched = fn;\n\t}\n\n\twriteValue(value) {\n\t\tthis._writeInputValue(this._formatItemForInput(value));\n\t\tif (this.showHint) {\n\t\t\tthis._inputValueBackup = value;\n\t\t}\n\t}\n\n\tsetDisabledState(isDisabled: boolean): void {\n\t\tthis._nativeElement.disabled = isDisabled;\n\t}\n\n\t/**\n\t * Dismisses typeahead popup window\n\t */\n\tdismissPopup() {\n\t\tif (this.isPopupOpen()) {\n\t\t\tthis._resubscribeTypeahead$.next(null);\n\t\t\tthis._closePopup();\n\t\t\tif (this.showHint && this._inputValueBackup !== null) {\n\t\t\t\tthis._writeInputValue(this._inputValueBackup);\n\t\t\t}\n\t\t\tthis._changeDetector.markForCheck();\n\t\t}\n\t}\n\n\t/**\n\t * Returns true if the typeahead popup window is displayed\n\t */\n\tisPopupOpen() {\n\t\treturn this._windowRef != null;\n\t}\n\n\thandleBlur() {\n\t\tthis._resubscribeTypeahead$.next(null);\n\t\tthis._onTouched();\n\t}\n\n\thandleKeyDown(event: KeyboardEvent) {\n\t\tif (!this.isPopupOpen()) {\n\t\t\treturn;\n\t\t}\n\n\t\t/* eslint-disable-next-line deprecation/deprecation */\n\t\tswitch (event.which) {\n\t\t\tcase Key.ArrowDown:\n\t\t\t\tevent.preventDefault();\n\t\t\t\tthis._windowRef!.instance.next();\n\t\t\t\tthis._showHint();\n\t\t\t\tbreak;\n\t\t\tcase Key.ArrowUp:\n\t\t\t\tevent.preventDefault();\n\t\t\t\tthis._windowRef!.instance.prev();\n\t\t\t\tthis._showHint();\n\t\t\t\tbreak;\n\t\t\tcase Key.Enter:\n\t\t\tcase Key.Tab: {\n\t\t\t\tconst result = this._windowRef!.instance.getActive();\n\t\t\t\tif (isDefined(result)) {\n\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\tevent.stopPropagation();\n\t\t\t\t\tthis._selectResult(result);\n\t\t\t\t}\n\t\t\t\tthis._closePopup();\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate _openPopup() {\n\t\tif (!this.isPopupOpen()) {\n\t\t\tthis._inputValueBackup = this._nativeElement.value;\n\t\t\tconst { windowRef } = this._popupService.open();\n\t\t\tthis._windowRef = windowRef;\n\t\t\tthis._windowRef.setInput('id', this.popupId);\n\t\t\tthis._windowRef.setInput('popupClass', this.popupClass);\n\t\t\tthis._windowRef.instance.selectEvent.subscribe((result: any) => this._selectResultClosePopup(result));\n\t\t\tthis._windowRef.instance.activeChangeEvent.subscribe((activeId: string) => (this.activeDescendant = activeId));\n\n\t\t\tif (this.container === 'body') {\n\t\t\t\t(this._windowRef.location.nativeElement as HTMLElement).style.zIndex = '1055';\n\t\t\t\tthis._document.body.appendChild(this._windowRef.location.nativeElement);\n\t\t\t}\n\n\t\t\tthis._changeDetector.markForCheck();\n\n\t\t\t// Setting up popper and scheduling updates when zone is stable\n\t\t\tthis._ngZone.runOutsideAngular(() => {\n\t\t\t\tif (this._windowRef) {\n\t\t\t\t\tthis._positioning.createPopper({\n\t\t\t\t\t\thostElement: this._nativeElement,\n\t\t\t\t\t\ttargetElement: this._windowRef.location.nativeElement,\n\t\t\t\t\t\tplacement: this.placement,\n\t\t\t\t\t\tappendToBody: this.container === 'body',\n\t\t\t\t\t\tupdatePopperOptions: (options) => this.popperOptions(addPopperOffset([0, 2])(options)),\n\t\t\t\t\t});\n\n\t\t\t\t\tthis._zoneSubscription = this._ngZone.onStable.subscribe(() => this._positioning.update());\n\t\t\t\t}\n\t\t\t});\n\n\t\t\tngbAutoClose(this._ngZone, this._document, 'outside', () => this.dismissPopup(), this._closed$, [\n\t\t\t\tthis._nativeElement,\n\t\t\t\tthis._windowRef.location.nativeElement,\n\t\t\t]);\n\t\t}\n\t}\n\n\tprivate _closePopup() {\n\t\tthis._popupService.close().subscribe(() => {\n\t\t\tthis._positioning.destroy();\n\t\t\tthis._zoneSubscription?.unsubscribe();\n\t\t\tthis._closed$.next();\n\t\t\tthis._windowRef = null;\n\t\t\tthis.activeDescendant = null;\n\t\t});\n\t}\n\n\tprivate _selectResult(result: any) {\n\t\tlet defaultPrevented = false;\n\t\tthis.selectItem.emit({\n\t\t\titem: result,\n\t\t\tpreventDefault: () => {\n\t\t\t\tdefaultPrevented = true;\n\t\t\t},\n\t\t});\n\t\tthis._resubscribeTypeahead$.next(null);\n\n\t\tif (!defaultPrevented) {\n\t\t\tthis.writeValue(result);\n\t\t\tthis._onChange(result);\n\t\t}\n\t}\n\n\tprivate _selectResultClosePopup(result: any) {\n\t\tthis._selectResult(result);\n\t\tthis._closePopup();\n\t}\n\n\tprivate _showHint() {\n\t\tif (this.showHint && this._windowRef?.instance.hasActive() && this._inputValueBackup != null) {\n\t\t\tconst userInputLowerCase = this._inputValueBackup.toLowerCase();\n\t\t\tconst formattedVal = this._formatItemForInput(this._windowRef.instance.getActive());\n\n\t\t\tif (userInputLowerCase === formattedVal.substring(0, this._inputValueBackup.length).toLowerCase()) {\n\t\t\t\tthis._writeInputValue(this._inputValueBackup + formattedVal.substring(this._inputValueBackup.length));\n\t\t\t\tthis._nativeElement['setSelectionRange'].apply(this._nativeElement, [\n\t\t\t\t\tthis._inputValueBackup.length,\n\t\t\t\t\tformattedVal.length,\n\t\t\t\t]);\n\t\t\t} else {\n\t\t\t\tthis._writeInputValue(formattedVal);\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate _formatItemForInput(item: any): string {\n\t\treturn item != null && this.inputFormatter ? this.inputFormatter(item) : toString(item);\n\t}\n\n\tprivate _writeInputValue(value: string): void {\n\t\tthis._nativeElement.value = toString(value);\n\t}\n\n\tprivate _subscribeToUserInput(): void {\n\t\tconst results$ = this._valueChanges$.pipe(\n\t\t\ttap((value) => {\n\t\t\t\tthis._inputValueBackup = this.showHint ? value : null;\n\t\t\t\tthis._inputValueForSelectOnExact = this.selectOnExact ? value : null;\n\t\t\t\tthis._onChange(this.editable ? value : undefined);\n\t\t\t}),\n\t\t\tthis.ngbTypeahead ? this.ngbTypeahead : () => of([]),\n\t\t);\n\n\t\tthis._subscription = this._resubscribeTypeahead$.pipe(switchMap(() => results$)).subscribe((results) => {\n\t\t\tif (!results || results.length === 0) {\n\t\t\t\tthis._closePopup();\n\t\t\t} else {\n\t\t\t\t// when there is only one result and this matches the input value\n\t\t\t\tif (\n\t\t\t\t\tthis.selectOnExact &&\n\t\t\t\t\tresults.length === 1 &&\n\t\t\t\t\tthis._formatItemForInput(results[0]) === this._inputValueForSelectOnExact\n\t\t\t\t) {\n\t\t\t\t\tthis._selectResult(results[0]);\n\t\t\t\t\tthis._closePopup();\n\t\t\t\t} else {\n\t\t\t\t\tthis._openPopup();\n\t\t\t\t\tthis._windowRef!.setInput('focusFirst', this.focusFirst);\n\t\t\t\t\tthis._windowRef!.setInput('results', results);\n\t\t\t\t\tthis._windowRef!.setInput('term', this._nativeElement.value);\n\t\t\t\t\tif (this.resultFormatter) {\n\t\t\t\t\t\tthis._windowRef!.setInput('formatter', this.resultFormatter);\n\t\t\t\t\t}\n\t\t\t\t\tif (this.resultTemplate) {\n\t\t\t\t\t\tthis._windowRef!.setInput('resultTemplate', this.resultTemplate);\n\t\t\t\t\t}\n\t\t\t\t\tthis._windowRef!.instance.resetActive();\n\n\t\t\t\t\t// The observable stream we are subscribing to might have async 