ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
574 lines • 48.4 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: autocomplete-trigger.directive.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Alibaba.com 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://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { DOWN_ARROW, ENTER, ESCAPE, TAB, UP_ARROW } from '@angular/cdk/keycodes';
import { ConnectionPositionPair, Overlay, OverlayConfig } from '@angular/cdk/overlay';
import { TemplatePortal } from '@angular/cdk/portal';
import { DOCUMENT } from '@angular/common';
import { Directive, ElementRef, forwardRef, Inject, Input, NgZone, Optional, ViewContainerRef } from '@angular/core';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
import { NzInputGroupWhitSuffixOrPrefixDirective } from 'ng-zorro-antd/input';
import { fromEvent, merge, Subject } from 'rxjs';
import { delay, distinct, map, take, takeUntil, tap } from 'rxjs/operators';
import { NzAutocompleteComponent } from './autocomplete.component';
/** @type {?} */
export const NZ_AUTOCOMPLETE_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef((/**
* @return {?}
*/
() => NzAutocompleteTriggerDirective)),
multi: true
};
/**
* @return {?}
*/
export function getNzAutocompleteMissingPanelError() {
return Error('Attempting to open an undefined instance of `nz-autocomplete`. ' +
'Make sure that the id passed to the `nzAutocomplete` is correct and that ' +
"you're attempting to open it after the ngAfterContentInit hook.");
}
export class NzAutocompleteTriggerDirective {
/**
* @param {?} elementRef
* @param {?} overlay
* @param {?} viewContainerRef
* @param {?} ngZone
* @param {?} nzInputGroupWhitSuffixOrPrefixDirective
* @param {?} document
*/
constructor(elementRef, overlay, viewContainerRef, ngZone, nzInputGroupWhitSuffixOrPrefixDirective, document) {
this.elementRef = elementRef;
this.overlay = overlay;
this.viewContainerRef = viewContainerRef;
this.ngZone = ngZone;
this.nzInputGroupWhitSuffixOrPrefixDirective = nzInputGroupWhitSuffixOrPrefixDirective;
this.document = document;
this.onChange = (/**
* @return {?}
*/
() => { });
this.onTouched = (/**
* @return {?}
*/
() => { });
this.panelOpen = false;
this.destroy$ = new Subject();
this.overlayRef = null;
this.portal = null;
this.previousValue = null;
}
/**
* Current active option
* @return {?}
*/
get activeOption() {
if (this.nzAutocomplete && this.nzAutocomplete.options.length) {
return this.nzAutocomplete.activeItem;
}
}
/**
* @return {?}
*/
ngOnDestroy() {
this.destroyPanel();
}
/**
* @param {?} value
* @return {?}
*/
writeValue(value) {
Promise.resolve(null).then((/**
* @return {?}
*/
() => this.setTriggerValue(value)));
}
/**
* @param {?} fn
* @return {?}
*/
registerOnChange(fn) {
this.onChange = fn;
}
/**
* @param {?} fn
* @return {?}
*/
registerOnTouched(fn) {
this.onTouched = fn;
}
/**
* @param {?} isDisabled
* @return {?}
*/
setDisabledState(isDisabled) {
/** @type {?} */
const element = this.elementRef.nativeElement;
element.disabled = isDisabled;
this.closePanel();
}
/**
* @return {?}
*/
openPanel() {
this.previousValue = this.elementRef.nativeElement.value;
this.attachOverlay();
this.updateStatus();
}
/**
* @return {?}
*/
closePanel() {
if (this.panelOpen) {
this.nzAutocomplete.isOpen = this.panelOpen = false;
if (this.overlayRef && this.overlayRef.hasAttached()) {
this.selectionChangeSubscription.unsubscribe();
this.overlayBackdropClickSubscription.unsubscribe();
this.overlayPositionChangeSubscription.unsubscribe();
this.optionsChangeSubscription.unsubscribe();
this.overlayRef.dispose();
this.overlayRef = null;
this.portal = null;
}
}
}
/**
* @param {?} event
* @return {?}
*/
handleKeydown(event) {
/** @type {?} */
const keyCode = event.keyCode;
/** @type {?} */
const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;
if (keyCode === ESCAPE) {
event.preventDefault();
}
if (this.panelOpen && (keyCode === ESCAPE || keyCode === TAB)) {
// Reset value when tab / ESC close
if (this.activeOption && this.activeOption.getLabel() !== this.previousValue) {
this.setTriggerValue(this.previousValue);
}
this.closePanel();
}
else if (this.panelOpen && keyCode === ENTER) {
if (this.nzAutocomplete.showPanel && this.activeOption) {
event.preventDefault();
this.activeOption.selectViaInteraction();
}
}
else if (this.panelOpen && isArrowKey && this.nzAutocomplete.showPanel) {
event.stopPropagation();
event.preventDefault();
if (keyCode === UP_ARROW) {
this.nzAutocomplete.setPreviousItemActive();
}
else {
this.nzAutocomplete.setNextItemActive();
}
if (this.activeOption) {
this.activeOption.scrollIntoViewIfNeeded();
}
this.doBackfill();
}
}
/**
* @param {?} event
* @return {?}
*/
handleInput(event) {
/** @type {?} */
const target = (/** @type {?} */ (event.target));
/** @type {?} */
const document = (/** @type {?} */ (this.document));
/** @type {?} */
let value = target.value;
if (target.type === 'number') {
value = value === '' ? null : parseFloat(value);
}
if (this.previousValue !== value) {
this.previousValue = value;
this.onChange(value);
if (this.canOpen() && document.activeElement === event.target) {
this.openPanel();
}
}
}
/**
* @return {?}
*/
handleFocus() {
if (this.canOpen()) {
this.openPanel();
}
}
/**
* @return {?}
*/
handleBlur() {
this.onTouched();
}
/**
* Subscription data source changes event
* @private
* @return {?}
*/
subscribeOptionsChange() {
/** @type {?} */
const firstStable = this.ngZone.onStable.asObservable().pipe(take(1));
/** @type {?} */
const optionChanges = this.nzAutocomplete.options.changes.pipe(tap((/**
* @return {?}
*/
() => this.positionStrategy.reapplyLastPosition())), delay(0));
return merge(firstStable, optionChanges).subscribe((/**
* @return {?}
*/
() => {
this.resetActiveItem();
if (this.panelOpen) {
(/** @type {?} */ (this.overlayRef)).updatePosition();
}
}));
}
/**
* Subscription option changes event and set the value
* @private
* @return {?}
*/
subscribeSelectionChange() {
return this.nzAutocomplete.selectionChange.subscribe((/**
* @param {?} option
* @return {?}
*/
(option) => {
this.setValueAndClose(option);
}));
}
/**
* Subscription external click and close panel
* @private
* @return {?}
*/
subscribeOverlayBackdropClick() {
return merge(fromEvent(this.document, 'click'), fromEvent(this.document, 'touchend')).subscribe((/**
* @param {?} event
* @return {?}
*/
(event) => {
/** @type {?} */
const clickTarget = (/** @type {?} */ (event.target));
// Make sure is not self
if (clickTarget !== this.elementRef.nativeElement && !(/** @type {?} */ (this.overlayRef)).overlayElement.contains(clickTarget) && this.panelOpen) {
this.closePanel();
}
}));
}
/**
* Subscription overlay position changes and reset dropdown position
* @private
* @return {?}
*/
subscribeOverlayPositionChange() {
return this.positionStrategy.positionChanges
.pipe(map((/**
* @param {?} position
* @return {?}
*/
(position) => position.connectionPair.originY)), distinct(), delay(0))
.subscribe((/**
* @param {?} position
* @return {?}
*/
(position) => {
this.nzAutocomplete.updatePosition(position);
}));
}
/**
* @private
* @return {?}
*/
attachOverlay() {
if (!this.nzAutocomplete) {
throw getNzAutocompleteMissingPanelError();
}
if (!this.portal && this.nzAutocomplete.template) {
this.portal = new TemplatePortal(this.nzAutocomplete.template, this.viewContainerRef);
}
if (!this.overlayRef) {
this.overlayRef = this.overlay.create(this.getOverlayConfig());
}
if (this.overlayRef && !this.overlayRef.hasAttached()) {
this.overlayRef.attach(this.portal);
this.overlayPositionChangeSubscription = this.subscribeOverlayPositionChange();
this.selectionChangeSubscription = this.subscribeSelectionChange();
this.overlayBackdropClickSubscription = this.subscribeOverlayBackdropClick();
this.optionsChangeSubscription = this.subscribeOptionsChange();
this.overlayRef
.detachments()
.pipe(takeUntil(this.destroy$))
.subscribe((/**
* @return {?}
*/
() => {
this.closePanel();
}));
}
this.nzAutocomplete.isOpen = this.panelOpen = true;
}
/**
* @private
* @return {?}
*/
updateStatus() {
if (this.overlayRef) {
this.overlayRef.updateSize({ width: this.nzAutocomplete.nzWidth || this.getHostWidth() });
}
this.nzAutocomplete.setVisibility();
this.resetActiveItem();
if (this.activeOption) {
this.activeOption.scrollIntoViewIfNeeded();
}
}
/**
* @private
* @return {?}
*/
destroyPanel() {
if (this.overlayRef) {
this.closePanel();
}
}
/**
* @private
* @return {?}
*/
getOverlayConfig() {
return new OverlayConfig({
positionStrategy: this.getOverlayPosition(),
disposeOnNavigation: true,
scrollStrategy: this.overlay.scrollStrategies.reposition(),
// default host element width
width: this.nzAutocomplete.nzWidth || this.getHostWidth()
});
}
/**
* @private
* @return {?}
*/
getConnectedElement() {
return this.nzInputGroupWhitSuffixOrPrefixDirective ? this.nzInputGroupWhitSuffixOrPrefixDirective.elementRef : this.elementRef;
}
/**
* @private
* @return {?}
*/
getHostWidth() {
return this.getConnectedElement().nativeElement.getBoundingClientRect().width;
}
/**
* @private
* @return {?}
*/
getOverlayPosition() {
/** @type {?} */
const positions = [
new ConnectionPositionPair({ originX: 'start', originY: 'bottom' }, { overlayX: 'start', overlayY: 'top' }),
new ConnectionPositionPair({ originX: 'start', originY: 'top' }, { overlayX: 'start', overlayY: 'bottom' })
];
this.positionStrategy = this.overlay
.position()
.flexibleConnectedTo(this.getConnectedElement())
.withFlexibleDimensions(false)
.withPush(false)
.withPositions(positions);
return this.positionStrategy;
}
/**
* @private
* @return {?}
*/
resetActiveItem() {
/** @type {?} */
const index = this.nzAutocomplete.getOptionIndex(this.previousValue);
this.nzAutocomplete.clearSelectedOptions(null, true);
if (index !== -1) {
this.nzAutocomplete.setActiveItem(index);
this.nzAutocomplete.activeItem.select(false);
}
else {
this.nzAutocomplete.setActiveItem(this.nzAutocomplete.nzDefaultActiveFirstOption ? 0 : -1);
}
}
/**
* @private
* @param {?} option
* @return {?}
*/
setValueAndClose(option) {
/** @type {?} */
const value = option.nzValue;
this.setTriggerValue(option.getLabel());
this.onChange(value);
this.elementRef.nativeElement.focus();
this.closePanel();
}
/**
* @private
* @param {?} value
* @return {?}
*/
setTriggerValue(value) {
/** @type {?} */
const option = this.nzAutocomplete.getOption(value);
/** @type {?} */
const displayValue = option ? option.getLabel() : value;
this.elementRef.nativeElement.value = displayValue != null ? displayValue : '';
if (!this.nzAutocomplete.nzBackfill) {
this.previousValue = displayValue;
}
}
/**
* @private
* @return {?}
*/
doBackfill() {
if (this.nzAutocomplete.nzBackfill && this.nzAutocomplete.activeItem) {
this.setTriggerValue(this.nzAutocomplete.activeItem.getLabel());
}
}
/**
* @private
* @return {?}
*/
canOpen() {
/** @type {?} */
const element = this.elementRef.nativeElement;
return !element.readOnly && !element.disabled;
}
}
NzAutocompleteTriggerDirective.decorators = [
{ type: Directive, args: [{
selector: `input[nzAutocomplete], textarea[nzAutocomplete]`,
exportAs: 'nzAutocompleteTrigger',
providers: [NZ_AUTOCOMPLETE_VALUE_ACCESSOR],
host: {
autocomplete: 'off',
'aria-autocomplete': 'list',
'(focusin)': 'handleFocus()',
'(blur)': 'handleBlur()',
'(input)': 'handleInput($event)',
'(keydown)': 'handleKeydown($event)'
}
},] }
];
/** @nocollapse */
NzAutocompleteTriggerDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: Overlay },
{ type: ViewContainerRef },
{ type: NgZone },
{ type: NzInputGroupWhitSuffixOrPrefixDirective, decorators: [{ type: Optional }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }
];
NzAutocompleteTriggerDirective.propDecorators = {
nzAutocomplete: [{ type: Input }]
};
if (false) {
/**
* Bind nzAutocomplete component
* @type {?}
*/
NzAutocompleteTriggerDirective.prototype.nzAutocomplete;
/** @type {?} */
NzAutocompleteTriggerDirective.prototype.onChange;
/** @type {?} */
NzAutocompleteTriggerDirective.prototype.onTouched;
/** @type {?} */
NzAutocompleteTriggerDirective.prototype.panelOpen;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.destroy$;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.overlayRef;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.portal;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.positionStrategy;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.previousValue;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.selectionChangeSubscription;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.optionsChangeSubscription;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.overlayBackdropClickSubscription;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.overlayPositionChangeSubscription;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.elementRef;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.overlay;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.viewContainerRef;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.ngZone;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.nzInputGroupWhitSuffixOrPrefixDirective;
/**
* @type {?}
* @private
*/
NzAutocompleteTriggerDirective.prototype.document;
}
//# 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* @license\n * Copyright Alibaba.com 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://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { DOWN_ARROW, ENTER, ESCAPE, TAB, UP_ARROW } from '@angular/cdk/keycodes';\nimport {\n  ConnectedOverlayPositionChange,\n  ConnectionPositionPair,\n  FlexibleConnectedPositionStrategy,\n  Overlay,\n  OverlayConfig,\n  OverlayRef,\n  PositionStrategy,\n  VerticalConnectionPos\n} from '@angular/cdk/overlay';\nimport { TemplatePortal } from '@angular/cdk/portal';\nimport { DOCUMENT } from '@angular/common';\nimport {\n  Directive,\n  ElementRef,\n  ExistingProvider,\n  forwardRef,\n  Inject,\n  Input,\n  NgZone,\n  OnDestroy,\n  Optional,\n  ViewContainerRef\n} from '@angular/core';\nimport { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';\nimport { NzSafeAny, OnChangeType, OnTouchedType } from 'ng-zorro-antd/core/types';\nimport { NzInputGroupWhitSuffixOrPrefixDirective } from 'ng-zorro-antd/input';\n\nimport { fromEvent, merge, Subject, Subscription } from 'rxjs';\nimport { delay, distinct, map, take, takeUntil, tap } from 'rxjs/operators';\n\nimport { NzAutocompleteOptionComponent } from './autocomplete-option.component';\nimport { NzAutocompleteComponent } from './autocomplete.component';\n\nexport const NZ_AUTOCOMPLETE_VALUE_ACCESSOR: ExistingProvider = {\n  provide: NG_VALUE_ACCESSOR,\n  useExisting: forwardRef(() => NzAutocompleteTriggerDirective),\n  multi: true\n};\n\nexport function getNzAutocompleteMissingPanelError(): Error {\n  return Error(\n    'Attempting to open an undefined instance of `nz-autocomplete`. ' +\n      'Make sure that the id passed to the `nzAutocomplete` is correct and that ' +\n      \"you're attempting to open it after the ngAfterContentInit hook.\"\n  );\n}\n\n@Directive({\n  selector: `input[nzAutocomplete], textarea[nzAutocomplete]`,\n  exportAs: 'nzAutocompleteTrigger',\n  providers: [NZ_AUTOCOMPLETE_VALUE_ACCESSOR],\n  host: {\n    autocomplete: 'off',\n    'aria-autocomplete': 'list',\n    '(focusin)': 'handleFocus()',\n    '(blur)': 'handleBlur()',\n    '(input)': 'handleInput($event)',\n    '(keydown)': 'handleKeydown($event)'\n  }\n})\nexport class NzAutocompleteTriggerDirective implements ControlValueAccessor, OnDestroy {\n  /** Bind nzAutocomplete component */\n  @Input() nzAutocomplete!: NzAutocompleteComponent;\n\n  onChange: OnChangeType = () => {};\n  onTouched: OnTouchedType = () => {};\n  panelOpen: boolean = false;\n\n  /** Current active option */\n  get activeOption(): NzAutocompleteOptionComponent | void {\n    if (this.nzAutocomplete && this.nzAutocomplete.options.length) {\n      return this.nzAutocomplete.activeItem;\n    }\n  }\n\n  private destroy$ = new Subject<void>();\n  private overlayRef: OverlayRef | null = null;\n  private portal: TemplatePortal<{}> | null = null;\n  private positionStrategy!: FlexibleConnectedPositionStrategy;\n  private previousValue: string | number | null = null;\n  private selectionChangeSubscription!: Subscription;\n  private optionsChangeSubscription!: Subscription;\n  private overlayBackdropClickSubscription!: Subscription;\n  private overlayPositionChangeSubscription!: Subscription;\n\n  constructor(\n    private elementRef: ElementRef,\n    private overlay: Overlay,\n    private viewContainerRef: ViewContainerRef,\n    private ngZone: NgZone,\n    @Optional() private nzInputGroupWhitSuffixOrPrefixDirective: NzInputGroupWhitSuffixOrPrefixDirective,\n    @Optional() @Inject(DOCUMENT) private document: NzSafeAny\n  ) {}\n\n  ngOnDestroy(): void {\n    this.destroyPanel();\n  }\n\n  writeValue(value: NzSafeAny): void {\n    Promise.resolve(null).then(() => this.setTriggerValue(value));\n  }\n\n  registerOnChange(fn: (value: {}) => {}): void {\n    this.onChange = fn;\n  }\n\n  registerOnTouched(fn: () => {}): void {\n    this.onTouched = fn;\n  }\n\n  setDisabledState(isDisabled: boolean): void {\n    const element: HTMLInputElement = this.elementRef.nativeElement;\n    element.disabled = isDisabled;\n    this.closePanel();\n  }\n\n  openPanel(): void {\n    this.previousValue = this.elementRef.nativeElement.value;\n    this.attachOverlay();\n    this.updateStatus();\n  }\n\n  closePanel(): void {\n    if (this.panelOpen) {\n      this.nzAutocomplete.isOpen = this.panelOpen = false;\n\n      if (this.overlayRef && this.overlayRef.hasAttached()) {\n        this.selectionChangeSubscription.unsubscribe();\n        this.overlayBackdropClickSubscription.unsubscribe();\n        this.overlayPositionChangeSubscription.unsubscribe();\n        this.optionsChangeSubscription.unsubscribe();\n        this.overlayRef.dispose();\n        this.overlayRef = null;\n        this.portal = null;\n      }\n    }\n  }\n\n  handleKeydown(event: KeyboardEvent): void {\n    const keyCode = event.keyCode;\n    const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;\n\n    if (keyCode === ESCAPE) {\n      event.preventDefault();\n    }\n\n    if (this.panelOpen && (keyCode === ESCAPE || keyCode === TAB)) {\n      // Reset value when tab / ESC close\n      if (this.activeOption && this.activeOption.getLabel() !== this.previousValue) {\n        this.setTriggerValue(this.previousValue);\n      }\n      this.closePanel();\n    } else if (this.panelOpen && keyCode === ENTER) {\n      if (this.nzAutocomplete.showPanel && this.activeOption) {\n        event.preventDefault();\n        this.activeOption.selectViaInteraction();\n      }\n    } else if (this.panelOpen && isArrowKey && this.nzAutocomplete.showPanel) {\n      event.stopPropagation();\n      event.preventDefault();\n      if (keyCode === UP_ARROW) {\n        this.nzAutocomplete.setPreviousItemActive();\n      } else {\n        this.nzAutocomplete.setNextItemActive();\n      }\n      if (this.activeOption) {\n        this.activeOption.scrollIntoViewIfNeeded();\n      }\n      this.doBackfill();\n    }\n  }\n\n  handleInput(event: KeyboardEvent): void {\n    const target = event.target as HTMLInputElement;\n    const document = this.document as Document;\n    let value: number | string | null = target.value;\n\n    if (target.type === 'number') {\n      value = value === '' ? null : parseFloat(value);\n    }\n    if (this.previousValue !== value) {\n      this.previousValue = value;\n      this.onChange(value);\n\n      if (this.canOpen() && document.activeElement === event.target) {\n        this.openPanel();\n      }\n    }\n  }\n\n  handleFocus(): void {\n    if (this.canOpen()) {\n      this.openPanel();\n    }\n  }\n\n  handleBlur(): void {\n    this.onTouched();\n  }\n\n  /**\n   * Subscription data source changes event\n   */\n  private subscribeOptionsChange(): Subscription {\n    const firstStable = this.ngZone.onStable.asObservable().pipe(take(1));\n    const optionChanges = this.nzAutocomplete.options.changes.pipe(\n      tap(() => this.positionStrategy.reapplyLastPosition()),\n      delay(0)\n    );\n    return merge(firstStable, optionChanges).subscribe(() => {\n      this.resetActiveItem();\n      if (this.panelOpen) {\n        this.overlayRef!.updatePosition();\n      }\n    });\n  }\n\n  /**\n   * Subscription option changes event and set the value\n   */\n  private subscribeSelectionChange(): Subscription {\n    return this.nzAutocomplete.selectionChange.subscribe((option: NzAutocompleteOptionComponent) => {\n      this.setValueAndClose(option);\n    });\n  }\n\n  /**\n   * Subscription external click and close panel\n   */\n  private subscribeOverlayBackdropClick(): Subscription {\n    return merge<MouseEvent | TouchEvent>(\n      fromEvent<MouseEvent>(this.document, 'click'),\n      fromEvent<TouchEvent>(this.document, 'touchend')\n    ).subscribe((event: MouseEvent | TouchEvent) => {\n      const clickTarget = event.target as HTMLElement;\n\n      // Make sure is not self\n      if (clickTarget !== this.elementRef.nativeElement && !this.overlayRef!.overlayElement.contains(clickTarget) && this.panelOpen) {\n        this.closePanel();\n      }\n    });\n  }\n\n  /**\n   * Subscription overlay position changes and reset dropdown position\n   */\n  private subscribeOverlayPositionChange(): Subscription {\n    return this.positionStrategy.positionChanges\n      .pipe(\n        map((position: ConnectedOverlayPositionChange) => position.connectionPair.originY),\n        distinct(),\n        delay(0)\n      )\n      .subscribe((position: VerticalConnectionPos) => {\n        this.nzAutocomplete.updatePosition(position);\n      });\n  }\n\n  private attachOverlay(): void {\n    if (!this.nzAutocomplete) {\n      throw getNzAutocompleteMissingPanelError();\n    }\n\n    if (!this.portal && this.nzAutocomplete.template) {\n      this.portal = new TemplatePortal(this.nzAutocomplete.template, this.viewContainerRef);\n    }\n\n    if (!this.overlayRef) {\n      this.overlayRef = this.overlay.create(this.getOverlayConfig());\n    }\n\n    if (this.overlayRef && !this.overlayRef.hasAttached()) {\n      this.overlayRef.attach(this.portal);\n      this.overlayPositionChangeSubscription = this.subscribeOverlayPositionChange();\n      this.selectionChangeSubscription = this.subscribeSelectionChange();\n      this.overlayBackdropClickSubscription = this.subscribeOverlayBackdropClick();\n      this.optionsChangeSubscription = this.subscribeOptionsChange();\n      this.overlayRef\n        .detachments()\n        .pipe(takeUntil(this.destroy$))\n        .subscribe(() => {\n          this.closePanel();\n        });\n    }\n    this.nzAutocomplete.isOpen = this.panelOpen = true;\n  }\n\n  private updateStatus(): void {\n    if (this.overlayRef) {\n      this.overlayRef.updateSize({ width: this.nzAutocomplete.nzWidth || this.getHostWidth() });\n    }\n    this.nzAutocomplete.setVisibility();\n    this.resetActiveItem();\n    if (this.activeOption) {\n      this.activeOption.scrollIntoViewIfNeeded();\n    }\n  }\n\n  private destroyPanel(): void {\n    if (this.overlayRef) {\n      this.closePanel();\n    }\n  }\n\n  private getOverlayConfig(): OverlayConfig {\n    return new OverlayConfig({\n      positionStrategy: this.getOverlayPosition(),\n      disposeOnNavigation: true,\n      scrollStrategy: this.overlay.scrollStrategies.reposition(),\n      // default host element width\n      width: this.nzAutocomplete.nzWidth || this.getHostWidth()\n    });\n  }\n\n  private getConnectedElement(): ElementRef {\n    return this.nzInputGroupWhitSuffixOrPrefixDirective ? this.nzInputGroupWhitSuffixOrPrefixDirective.elementRef : this.elementRef;\n  }\n\n  private getHostWidth(): number {\n    return this.getConnectedElement().nativeElement.getBoundingClientRect().width;\n  }\n\n  private getOverlayPosition(): PositionStrategy {\n    const positions = [\n      new ConnectionPositionPair({ originX: 'start', originY: 'bottom' }, { overlayX: 'start', overlayY: 'top' }),\n      new ConnectionPositionPair({ originX: 'start', originY: 'top' }, { overlayX: 'start', overlayY: 'bottom' })\n    ];\n    this.positionStrategy = this.overlay\n      .position()\n      .flexibleConnectedTo(this.getConnectedElement())\n      .withFlexibleDimensions(false)\n      .withPush(false)\n      .withPositions(positions);\n    return this.positionStrategy;\n  }\n\n  private resetActiveItem(): void {\n    const index = this.nzAutocomplete.getOptionIndex(this.previousValue);\n    this.nzAutocomplete.clearSelectedOptions(null, true);\n    if (index !== -1) {\n      this.nzAutocomplete.setActiveItem(index);\n      this.nzAutocomplete.activeItem.select(false);\n    } else {\n      this.nzAutocomplete.setActiveItem(this.nzAutocomplete.nzDefaultActiveFirstOption ? 0 : -1);\n    }\n  }\n\n  private setValueAndClose(option: NzAutocompleteOptionComponent): void {\n    const value = option.nzValue;\n    this.setTriggerValue(option.getLabel());\n    this.onChange(value);\n    this.elementRef.nativeElement.focus();\n    this.closePanel();\n  }\n\n  private setTriggerValue(value: NzSafeAny): void {\n    const option = this.nzAutocomplete.getOption(value);\n    const displayValue = option ? option.getLabel() : value;\n    this.elementRef.nativeElement.value = displayValue != null ? displayValue : '';\n    if (!this.nzAutocomplete.nzBackfill) {\n      this.previousValue = displayValue;\n    }\n  }\n\n  private doBackfill(): void {\n    if (this.nzAutocomplete.nzBackfill && this.nzAutocomplete.activeItem) {\n      this.setTriggerValue(this.nzAutocomplete.activeItem.getLabel());\n    }\n  }\n\n  private canOpen(): boolean {\n    const element: HTMLInputElement = this.elementRef.nativeElement;\n    return !element.readOnly && !element.disabled;\n  }\n}\n"]}