primeng/fesm2015/primeng-dropdown.mjs.map

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{"version":3,"file":"primeng-dropdown.mjs","sources":["../../src/app/components/dropdown/dropdown.ts","../../src/app/components/dropdown/primeng-dropdown.ts"],"sourcesContent":["import {ScrollingModule, CdkVirtualScrollViewport} from '@angular/cdk/scrolling';\nimport {NgModule,Component,ElementRef,OnInit,AfterViewInit,AfterContentInit,AfterViewChecked,OnDestroy,Input,Output,Renderer2,EventEmitter,ContentChildren,\n        QueryList,ViewChild,TemplateRef,forwardRef,ChangeDetectorRef,NgZone,ViewRef,ChangeDetectionStrategy, ViewEncapsulation} from '@angular/core';\nimport {trigger,style,transition,animate,AnimationEvent} from '@angular/animations';\nimport {CommonModule} from '@angular/common';\nimport {OverlayService, PrimeNGConfig, SelectItem, TranslationKeys} from 'primeng/api';\nimport {SharedModule,PrimeTemplate, FilterService} from 'primeng/api';\nimport {DomHandler, ConnectedOverlayScrollHandler} from 'primeng/dom';\nimport {ObjectUtils,UniqueComponentId,ZIndexUtils} from 'primeng/utils';\nimport {NG_VALUE_ACCESSOR, ControlValueAccessor} from '@angular/forms';\nimport {TooltipModule} from 'primeng/tooltip';\nimport {RippleModule} from 'primeng/ripple';\n\nexport const DROPDOWN_VALUE_ACCESSOR: any = {\n  provide: NG_VALUE_ACCESSOR,\n  useExisting: forwardRef(() => Dropdown),\n  multi: true\n};\n\n@Component({\n    selector: 'p-dropdownItem',\n    template: `\n        <li (click)=\"onOptionClick($event)\" role=\"option\" pRipple\n            [attr.aria-label]=\"label\" [attr.aria-selected]=\"selected\"\n            [ngStyle]=\"{'height': itemSize + 'px'}\" [id]=\"selected ? 'p-highlighted-option':''\"\n            [ngClass]=\"{'p-dropdown-item':true, 'p-highlight': selected, 'p-disabled': disabled}\">\n            <span *ngIf=\"!template\">{{label||'empty'}}</span>\n            <ng-container *ngTemplateOutlet=\"template; context: {$implicit: option}\"></ng-container>\n        </li>\n    `,\n    host: {\n        'class': 'p-element'\n    }\n})\nexport class DropdownItem {\n\n    @Input() option: SelectItem;\n\n    @Input() selected: boolean;\n\n    @Input() label: string;\n\n    @Input() disabled: boolean;\n\n    @Input() visible: boolean;\n\n    @Input() itemSize: number;\n\n    @Input() template: TemplateRef<any>;\n\n    @Output() onClick: EventEmitter<any> = new EventEmitter();\n\n    onOptionClick(event: Event) {\n        this.onClick.emit({\n            originalEvent: event,\n            option: this.option\n        });\n    }\n}\n\n@Component({\n    selector: 'p-dropdown',\n    template: `\n         <div #container [ngClass]=\"{'p-dropdown p-component':true,\n            'p-disabled':disabled, 'p-dropdown-open':overlayVisible, 'p-focus':focused, 'p-dropdown-clearable': showClear && !disabled}\"\n            (click)=\"onMouseclick($event)\" [ngStyle]=\"style\" [class]=\"styleClass\">\n            <div class=\"p-hidden-accessible\">\n                <input #in [attr.id]=\"inputId\" type=\"text\" readonly (focus)=\"onInputFocus($event)\" aria-haspopup=\"listbox\" [attr.placeholder]=\"placeholder\"\n                    aria-haspopup=\"listbox\" [attr.aria-label]=\"ariaLabel\" [attr.aria-expanded]=\"false\" [attr.aria-labelledby]=\"ariaLabelledBy\" (blur)=\"onInputBlur($event)\" (keydown)=\"onKeydown($event, true)\"\n                    [disabled]=\"disabled\" [attr.tabindex]=\"tabindex\" [attr.autofocus]=\"autofocus\" [attr.aria-activedescendant]=\"overlayVisible ? labelId : null\" role=\"combobox\">\n            </div>\n            <span [attr.id]=\"labelId\" [ngClass]=\"{'p-dropdown-label p-inputtext':true,'p-dropdown-label-empty':(label == null || label.length === 0)}\" *ngIf=\"!editable && (label != null)\" [pTooltip]=\"tooltip\" [tooltipPosition]=\"tooltipPosition\" [positionStyle]=\"tooltipPositionStyle\" [tooltipStyleClass]=\"tooltipStyleClass\">\n                <ng-container *ngIf=\"!selectedItemTemplate\">{{label||'empty'}}</ng-container>\n                <ng-container *ngTemplateOutlet=\"selectedItemTemplate; context: {$implicit: selectedOption}\"></ng-container>\n            </span>\n            <span [ngClass]=\"{'p-dropdown-label p-inputtext p-placeholder':true,'p-dropdown-label-empty': (placeholder == null || placeholder.length === 0)}\" *ngIf=\"!editable && (label == null)\">{{placeholder||'empty'}}</span>\n            <input #editableInput type=\"text\" [attr.maxlength]=\"maxlength\" class=\"p-dropdown-label p-inputtext\" *ngIf=\"editable\" [disabled]=\"disabled\" [attr.placeholder]=\"placeholder\"\n                aria-haspopup=\"listbox\" [attr.aria-expanded]=\"overlayVisible\" (click)=\"onEditableInputClick()\" (input)=\"onEditableInputChange($event)\" (focus)=\"onEditableInputFocus($event)\" (blur)=\"onInputBlur($event)\">\n            <i class=\"p-dropdown-clear-icon pi pi-times\" (click)=\"clear($event)\" *ngIf=\"value != null && showClear && !disabled\"></i>\n            <div class=\"p-dropdown-trigger\" role=\"button\" aria-label=\"dropdown trigger\" aria-haspopup=\"listbox\" [attr.aria-expanded]=\"overlayVisible\">\n                <span class=\"p-dropdown-trigger-icon\" [ngClass]=\"dropdownIcon\"></span>\n            </div>\n            <div *ngIf=\"overlayVisible\" [ngClass]=\"'p-dropdown-panel p-component'\" (click)=\"onOverlayClick($event)\" [@overlayAnimation]=\"{value: 'visible', params: {showTransitionParams: showTransitionOptions, hideTransitionParams: hideTransitionOptions}}\" (@overlayAnimation.start)=\"onOverlayAnimationStart($event)\" (@overlayAnimation.start)=\"onOverlayAnimationEnd($event)\"onOverlayAnimationEnd [ngStyle]=\"panelStyle\" [class]=\"panelStyleClass\">\n                <ng-container *ngTemplateOutlet=\"headerTemplate\"></ng-container>\n                <div class=\"p-dropdown-header\" *ngIf=\"filter\">\n                    <div class=\"p-dropdown-filter-container\" (click)=\"$event.stopPropagation()\">\n                        <input #filter type=\"text\" autocomplete=\"off\" [value]=\"filterValue||''\" class=\"p-dropdown-filter p-inputtext p-component\" [attr.placeholder]=\"filterPlaceholder\"\n                        (keydown.enter)=\"$event.preventDefault()\" (keydown)=\"onKeydown($event, false)\" (input)=\"onFilterInputChange($event)\" [attr.aria-label]=\"ariaFilterLabel\" [attr.aria-activedescendant]=\"overlayVisible ? 'p-highlighted-option' : labelId\">\n                        <span class=\"p-dropdown-filter-icon pi pi-search\"></span>\n                    </div>\n                </div>\n                <div class=\"p-dropdown-items-wrapper\" [style.max-height]=\"virtualScroll ? 'auto' : (scrollHeight||'auto')\">\n                    <ul [attr.id]=\"listId\" class=\"p-dropdown-items\" [ngClass]=\"{'p-dropdown-virtualscroll': virtualScroll}\" role=\"listbox\">\n                        <ng-container *ngIf=\"group\">\n                            <ng-template ngFor let-optgroup [ngForOf]=\"optionsToDisplay\">\n                                <li class=\"p-dropdown-item-group\">\n                                    <span *ngIf=\"!groupTemplate\">{{getOptionGroupLabel(optgroup)||'empty'}}</span>\n                                    <ng-container *ngTemplateOutlet=\"groupTemplate; context: {$implicit: optgroup}\"></ng-container>\n                                </li>\n                                <ng-container *ngTemplateOutlet=\"itemslist; context: {$implicit: getOptionGroupChildren(optgroup), selectedOption: selectedOption}\"></ng-container>\n                            </ng-template>\n                        </ng-container>\n                        <ng-container *ngIf=\"!group\">\n                            <ng-container *ngTemplateOutlet=\"itemslist; context: {$implicit: optionsToDisplay, selectedOption: selectedOption}\"></ng-container>\n                        </ng-container>\n                        <ng-template #itemslist let-options let-selectedOption=\"selectedOption\">\n                            <ng-container *ngIf=\"!virtualScroll; else virtualScrollList\">\n                                <ng-template ngFor let-option let-i=\"index\" [ngForOf]=\"options\">\n                                    <p-dropdownItem [option]=\"option\" [selected]=\"selectedOption == option\" [label]=\"getOptionLabel(option)\" [disabled]=\"isOptionDisabled(option)\"\n                                                    (onClick)=\"onItemClick($event)\"\n                                                    [template]=\"itemTemplate\"></p-dropdownItem>\n                                </ng-template>\n                            </ng-container>\n                            <ng-template #virtualScrollList>\n                                <cdk-virtual-scroll-viewport (scrolledIndexChange)=\"scrollToSelectedVirtualScrollElement()\" #viewport [ngStyle]=\"{'height': scrollHeight}\" [itemSize]=\"itemSize\" *ngIf=\"virtualScroll && optionsToDisplay && optionsToDisplay.length\">\n                                    <ng-container *cdkVirtualFor=\"let option of options; let i = index; let c = count; let f = first; let l = last; let e = even; let o = odd\">\n                                        <p-dropdownItem [option]=\"option\" [selected]=\"selectedOption == option\" [label]=\"getOptionLabel(option)\" [disabled]=\"isOptionDisabled(option)\"\n                                                                   (onClick)=\"onItemClick($event)\"\n                                                                   [template]=\"itemTemplate\"></p-dropdownItem>\n                                    </ng-container>\n                                </cdk-virtual-scroll-viewport>\n                            </ng-template>\n                        </ng-template>\n                        <li *ngIf=\"filterValue && isEmpty()\" class=\"p-dropdown-empty-message\">\n                            <ng-container *ngIf=\"!emptyFilterTemplate && !emptyTemplate; else emptyFilter\">\n                                {{emptyFilterMessageLabel}}\n                            </ng-container>\n                            <ng-container #emptyFilter *ngTemplateOutlet=\"emptyFilterTemplate || emptyTemplate\"></ng-container>\n                        </li>\n                        <li *ngIf=\"!filterValue && isEmpty()\" class=\"p-dropdown-empty-message\">\n                            <ng-container *ngIf=\"!emptyTemplate; else empty\">\n                                {{emptyMessageLabel}}\n                            </ng-container>\n                            <ng-container #empty *ngTemplateOutlet=\"emptyTemplate\"></ng-container>\n                        </li>\n                    </ul>\n                </div>\n                <ng-container *ngTemplateOutlet=\"footerTemplate\"></ng-container>\n            </div>\n        </div>\n    `,\n    animations: [\n        trigger('overlayAnimation', [\n            transition(':enter', [\n                style({opacity: 0, transform: 'scaleY(0.8)'}),\n                animate('{{showTransitionParams}}')\n            ]),\n            transition(':leave', [\n                animate('{{hideTransitionParams}}', style({ opacity: 0 }))\n            ])\n        ])\n    ],\n    host: {\n        'class': 'p-element p-inputwrapper',\n        '[class.p-inputwrapper-filled]': 'filled',\n        '[class.p-inputwrapper-focus]': 'focused || overlayVisible'\n    },\n    providers: [DROPDOWN_VALUE_ACCESSOR],\n    changeDetection: ChangeDetectionStrategy.OnPush,\n    encapsulation: ViewEncapsulation.None,\n    styleUrls: ['./dropdown.css']\n})\nexport class Dropdown implements OnInit,AfterViewInit,AfterContentInit,AfterViewChecked,OnDestroy,ControlValueAccessor {\n\n    @Input() scrollHeight: string = '200px';\n\n    @Input() filter: boolean;\n\n    @Input() name: string;\n\n    @Input() style: any;\n\n    @Input() panelStyle: any;\n\n    @Input() styleClass: string;\n\n    @Input() panelStyleClass: string;\n\n    @Input() readonly: boolean;\n\n    @Input() required: boolean;\n\n    @Input() editable: boolean;\n\n    @Input() appendTo: any;\n\n    @Input() tabindex: number;\n\n    @Input() placeholder: string;\n\n    @Input() filterPlaceholder: string;\n\n    @Input() filterLocale: string;\n\n    @Input() inputId: string;\n\n    @Input() selectId: string;\n\n    @Input() dataKey: string;\n\n    @Input() filterBy: string;\n\n    @Input() autofocus: boolean;\n\n    @Input() resetFilterOnHide: boolean = false;\n\n    @Input() dropdownIcon: string = 'pi pi-chevron-down';\n\n    @Input() optionLabel: string;\n\n    @Input() optionValue: string;\n\n    @Input() optionDisabled: string;\n\n    @Input() optionGroupLabel: string;\n\n    @Input() optionGroupChildren: string = \"items\";\n\n    @Input() autoDisplayFirst: boolean = true;\n\n    @Input() group: boolean;\n\n    @Input() showClear: boolean;\n\n    @Input() emptyFilterMessage: string = '';\n\n    @Input() emptyMessage: string = '';\n\n    @Input() virtualScroll: boolean;\n\n    @Input() itemSize: number;\n\n    @Input() autoZIndex: boolean = true;\n\n    @Input() baseZIndex: number = 0;\n\n    @Input() showTransitionOptions: string = '.12s cubic-bezier(0, 0, 0.2, 1)';\n\n    @Input() hideTransitionOptions: string = '.1s linear';\n\n    @Input() ariaFilterLabel: string;\n\n    @Input() ariaLabel: string;\n\n    @Input() ariaLabelledBy: string;\n\n    @Input() filterMatchMode: string = \"contains\";\n\n    @Input() maxlength: number;\n\n    @Input() tooltip: string = '';\n\n    @Input() tooltipPosition: string = 'right';\n\n    @Input() tooltipPositionStyle: string = 'absolute';\n\n    @Input() tooltipStyleClass: string;\n\n    @Input() autofocusFilter: boolean = true;\n\n    @Output() onChange: EventEmitter<any> = new EventEmitter();\n\n    @Output() onFilter: EventEmitter<any> = new EventEmitter();\n\n    @Output() onFocus: EventEmitter<any> = new EventEmitter();\n\n    @Output() onBlur: EventEmitter<any> = new EventEmitter();\n\n    @Output() onClick: EventEmitter<any> = new EventEmitter();\n\n    @Output() onShow: EventEmitter<any> = new EventEmitter();\n\n    @Output() onHide: EventEmitter<any> = new EventEmitter();\n\n    @Output() onClear: EventEmitter<any> = new EventEmitter();\n\n    @ViewChild('container') containerViewChild: ElementRef;\n\n    @ViewChild('filter') filterViewChild: ElementRef;\n\n    @ViewChild('in') accessibleViewChild: ElementRef;\n\n    @ViewChild(CdkVirtualScrollViewport) viewPort: CdkVirtualScrollViewport;\n\n    @ViewChild('editableInput') editableInputViewChild: ElementRef;\n\n    @ContentChildren(PrimeTemplate) templates: QueryList<any>;\n\n    private _disabled: boolean;\n\n    @Input() get disabled(): boolean {\n        return this._disabled;\n    };\n\n    set disabled(_disabled: boolean) {\n        if (_disabled) {\n            this.focused = false;\n\n            if (this.overlayVisible)\n                this.hide();\n        }\n\n        this._disabled = _disabled;\n        if (!(this.cd as ViewRef).destroyed) {\n            this.cd.detectChanges();\n        }\n    }\n\n    overlay: HTMLDivElement;\n\n    itemsWrapper: HTMLDivElement;\n\n    itemTemplate: TemplateRef<any>;\n\n    groupTemplate: TemplateRef<any>;\n\n    selectedItemTemplate: TemplateRef<any>;\n\n    headerTemplate: TemplateRef<any>;\n\n    footerTemplate: TemplateRef<any>;\n\n    emptyFilterTemplate: TemplateRef<any>;\n\n    emptyTemplate: TemplateRef<any>;\n\n    selectedOption: any;\n\n    _options: any[];\n\n    value: any;\n\n    onModelChange: Function = () => {};\n\n    onModelTouched: Function = () => {};\n\n    optionsToDisplay: any[];\n\n    hover: boolean;\n\n    focused: boolean;\n\n    overlayVisible: boolean;\n\n    documentClickListener: any;\n\n    scrollHandler: any;\n\n    optionsChanged: boolean;\n\n    panel: HTMLDivElement;\n\n    dimensionsUpdated: boolean;\n\n    hoveredItem: any;\n\n    selectedOptionUpdated: boolean;\n\n    _filterValue: string;\n\n    searchValue: string;\n\n    searchIndex: number;\n\n    searchTimeout: any;\n\n    previousSearchChar: string;\n\n    currentSearchChar: string;\n\n    documentResizeListener: any;\n\n    virtualAutoScrolled: boolean;\n\n    virtualScrollSelectedIndex: number;\n\n    viewPortOffsetTop: number = 0;\n\n    preventModelTouched: boolean;\n\n    preventDocumentDefault: boolean;\n\n    id: string = UniqueComponentId();\n\n    labelId: string;\n\n    listId: string;\n\n    constructor(public el: ElementRef, public renderer: Renderer2, public cd: ChangeDetectorRef, public zone: NgZone, public filterService: FilterService, public config: PrimeNGConfig, public overlayService: OverlayService) {}\n\n    ngAfterContentInit() {\n        this.templates.forEach((item) => {\n            switch(item.getType()) {\n                case 'item':\n                    this.itemTemplate = item.template;\n                break;\n\n                case 'selectedItem':\n                    this.selectedItemTemplate = item.template;\n                break;\n\n                case 'header':\n                    this.headerTemplate = item.template;\n                break;\n\n                case 'footer':\n                    this.footerTemplate = item.template;\n                break;\n\n                case 'emptyfilter':\n                    this.emptyFilterTemplate = item.template;\n                break;\n\n                case 'empty':\n                    this.emptyTemplate = item.template;\n                break;\n\n                case 'group':\n                    this.groupTemplate = item.template;\n                break;\n\n                default:\n                    this.itemTemplate = item.template;\n                break;\n            }\n        });\n    }\n\n    ngOnInit() {\n        this.optionsToDisplay = this.options;\n        this.updateSelectedOption(null);\n        this.labelId = this.id + '_label';\n        this.listId = this.id + '_list';\n    }\n\n    @Input() get options(): any[] {\n        return this._options;\n    }\n\n    set options(val: any[]) {\n        this._options = val;\n        this.optionsToDisplay = this._options;\n        this.updateSelectedOption(this.value);\n        this.optionsChanged = true;\n\n        if (this._filterValue && this._filterValue.length) {\n            this.activateFilter();\n        }\n    }\n\n    @Input() get filterValue(): string {\n        return this._filterValue;\n    }\n\n    set filterValue(val: string) {\n        this._filterValue = val;\n        this.activateFilter();\n    }\n\n    ngAfterViewInit() {\n        if (this.editable) {\n            this.updateEditableLabel();\n        }\n    }\n\n    get label(): string {\n        return this.selectedOption ? this.getOptionLabel(this.selectedOption) : null;\n    }\n\n    get emptyMessageLabel(): string {\n        return this.emptyMessage || this.config.getTranslation(TranslationKeys.EMPTY_MESSAGE);\n    }\n\n    get emptyFilterMessageLabel(): string {\n        return this.emptyFilterMessage || this.config.getTranslation(TranslationKeys.EMPTY_FILTER_MESSAGE);\n    }\n\n    get filled() {\n        return this.value || this.value != null || this.value != undefined;\n    }\n\n    updateEditableLabel(): void {\n        if (this.editableInputViewChild && this.editableInputViewChild.nativeElement) {\n            this.editableInputViewChild.nativeElement.value = (this.selectedOption ? this.getOptionLabel(this.selectedOption) : this.value||'');\n        }\n    }\n\n    getOptionLabel(option: any) {\n        return this.optionLabel ? ObjectUtils.resolveFieldData(option, this.optionLabel) : (option.label != undefined ? option.label : option);\n    }\n\n    getOptionValue(option: any) {\n        return this.optionValue ? ObjectUtils.resolveFieldData(option, this.optionValue) : (this.optionLabel || option.value === undefined ? option : option.value);\n    }\n\n    isOptionDisabled(option: any) {\n        return this.optionDisabled ? ObjectUtils.resolveFieldData(option, this.optionDisabled) : (option.disabled !== undefined ? option.disabled : false);\n    }\n\n    getOptionGroupLabel(optionGroup: any) {\n        return this.optionGroupLabel ? ObjectUtils.resolveFieldData(optionGroup, this.optionGroupLabel) : (optionGroup.label != undefined ? optionGroup.label : optionGroup);\n    }\n\n    getOptionGroupChildren(optionGroup: any) {\n        return this.optionGroupChildren ? ObjectUtils.resolveFieldData(optionGroup, this.optionGroupChildren) : optionGroup.items;\n    }\n\n    onItemClick(event) {\n        const option = event.option;\n\n        if (!this.isOptionDisabled(option)) {\n            this.selectItem(event.originalEvent, option);\n            this.accessibleViewChild.nativeElement.focus();\n        }\n\n        setTimeout(() => {\n            this.hide();\n        }, 150);\n    }\n\n    selectItem(event, option) {\n        if (this.selectedOption != option) {\n            this.selectedOption = option;\n            this.value = this.getOptionValue(option);\n\n            this.onModelChange(this.value);\n            this.updateEditableLabel();\n            this.onChange.emit({\n                originalEvent: event,\n                value: this.value\n            });\n\n            if (this.virtualScroll) {\n                setTimeout(() => {\n                    this.viewPortOffsetTop = this.viewPort ? this.viewPort.measureScrollOffset() : 0;\n                }, 1);\n            }\n        }\n    }\n\n    ngAfterViewChecked() {\n        if (this.optionsChanged && this.overlayVisible) {\n            this.optionsChanged = false;\n\n            if (this.virtualScroll) {\n                this.updateVirtualScrollSelectedIndex(true);\n            }\n\n            this.zone.runOutsideAngular(() => {\n                setTimeout(() => {\n                    this.alignOverlay();\n                }, 1);\n            });\n        }\n\n        if (this.selectedOptionUpdated && this.itemsWrapper) {\n            if (this.virtualScroll && this.viewPort) {\n                let range = this.viewPort.getRenderedRange();\n                this.updateVirtualScrollSelectedIndex(false);\n\n                if (range.start > this.virtualScrollSelectedIndex || range.end < this.virtualScrollSelectedIndex) {\n                    this.viewPort.scrollToIndex(this.virtualScrollSelectedIndex);\n                }\n            }\n\n            let selectedItem = DomHandler.findSingle(this.overlay, 'li.p-highlight');\n            if (selectedItem) {\n                DomHandler.scrollInView(this.itemsWrapper, DomHandler.findSingle(this.overlay, 'li.p-highlight'));\n            }\n            this.selectedOptionUpdated = false;\n        }\n    }\n\n    writeValue(value: any): void {\n        if (this.filter) {\n            this.resetFilter();\n        }\n\n        this.value = value;\n        this.updateSelectedOption(value);\n        this.updateEditableLabel();\n        this.cd.markForCheck();\n    }\n\n    resetFilter(): void {\n        this._filterValue = null;\n\n        if (this.filterViewChild && this.filterViewChild.nativeElement) {\n            this.filterViewChild.nativeElement.value = '';\n        }\n\n        this.optionsToDisplay = this.options;\n    }\n\n    updateSelectedOption(val: any): void {\n        this.selectedOption = this.findOption(val, this.optionsToDisplay);\n\n        if (this.autoDisplayFirst && !this.placeholder && !this.selectedOption && this.optionsToDisplay && this.optionsToDisplay.length && !this.editable) {\n            this.selectedOption = this.optionsToDisplay[0];\n            this.value = this.getOptionValue(this.selectedOption);\n            this.onModelChange(this.value);\n        }\n\n        this.selectedOptionUpdated = true;\n    }\n\n    registerOnChange(fn: Function): void {\n        this.onModelChange = fn;\n    }\n\n    registerOnTouched(fn: Function): void {\n        this.onModelTouched = fn;\n    }\n\n    setDisabledState(val: boolean): void {\n        this.disabled = val;\n        this.cd.markForCheck();\n    }\n\n    onMouseclick(event) {\n        if (this.disabled || this.readonly || this.isInputClick(event)) {\n            return;\n        }\n\n        this.onClick.emit(event);\n        this.accessibleViewChild.nativeElement.focus();\n\n        if (this.overlayVisible)\n            this.hide();\n        else\n            this.show();\n\n        this.cd.detectChanges();\n    }\n\n    onOverlayClick(event) {\n        this.overlayService.add({\n            originalEvent: event,\n            target: this.el.nativeElement\n        });\n    }\n\n    isInputClick(event): boolean {\n        return DomHandler.hasClass(event.target, 'p-dropdown-clear-icon') ||\n            event.target.isSameNode(this.accessibleViewChild.nativeElement) ||\n            (this.editableInputViewChild && event.target.isSameNode(this.editableInputViewChild.nativeElement));\n    }\n\n    isOutsideClicked(event: Event): boolean {\n        return !(this.el.nativeElement.isSameNode(event.target) || this.el.nativeElement.contains(event.target) || (this.overlay && this.overlay.contains(<Node> event.target)));\n    }\n\n    isEmpty() {\n        return !this.optionsToDisplay || (this.optionsToDisplay && this.optionsToDisplay.length === 0);\n    }\n\n    onEditableInputClick() {\n        this.bindDocumentClickListener();\n    }\n\n    onEditableInputFocus(event) {\n        this.focused = true;\n        this.hide();\n        this.onFocus.emit(event);\n    }\n\n    onEditableInputChange(event) {\n        this.value = event.target.value;\n        this.updateSelectedOption(this.value);\n        this.onModelChange(this.value);\n        this.onChange.emit({\n            originalEvent: event,\n            value: this.value\n        });\n    }\n\n    show() {\n        this.overlayVisible = true;\n        this.preventDocumentDefault = true;\n        this.cd.markForCheck();\n    }\n\n    onOverlayAnimationStart(event: AnimationEvent) {\n        switch (event.toState) {\n            case 'visible':\n                this.overlay = event.element;\n                let itemsWrapperSelector = this.virtualScroll ? '.cdk-virtual-scroll-viewport' : '.p-dropdown-items-wrapper';\n                this.itemsWrapper = DomHandler.findSingle(this.overlay, itemsWrapperSelector);\n                this.appendOverlay();\n                if (this.autoZIndex) {\n                    ZIndexUtils.set('overlay', this.overlay, this.baseZIndex + this.config.zIndex.overlay);\n                }\n                this.alignOverlay();\n                this.bindDocumentClickListener();\n                this.bindDocumentResizeListener();\n                this.bindScrollListener();\n\n                if (this.options && this.options.length) {\n                    if (!this.virtualScroll) {\n                        let selectedListItem = DomHandler.findSingle(this.itemsWrapper, '.p-dropdown-item.p-highlight');\n\n                        if (selectedListItem) {\n                            selectedListItem.scrollIntoView({ block: 'nearest', inline: 'center' });\n                        }\n                    }\n                }\n\n                if (this.filterViewChild && this.filterViewChild.nativeElement) {\n                    this.preventModelTouched = true;\n\n                    if (this.autofocusFilter) {\n                        this.filterViewChild.nativeElement.focus();\n                    }\n                }\n\n                this.onShow.emit(event);\n            break;\n\n            case 'void':\n                this.onOverlayHide();\n                this.onHide.emit(event);\n            break;\n        }\n    }\n\n    onOverlayAnimationEnd(event: AnimationEvent) {\n        switch (event.toState) {\n            case 'void':\n                ZIndexUtils.clear(event.element);\n            break;\n        }\n    }\n\n    scrollToSelectedVirtualScrollElement() {\n        if (!this.virtualAutoScrolled) {\n            if (this.viewPortOffsetTop) {\n                this.viewPort.scrollToOffset(this.viewPortOffsetTop);\n            }\n            else if (this.virtualScrollSelectedIndex > -1) {\n                this.viewPort.scrollToIndex(this.virtualScrollSelectedIndex);\n            }\n        }\n\n        this.virtualAutoScrolled = true;\n    }\n\n    updateVirtualScrollSelectedIndex(resetOffset) {\n        if (this.selectedOption && this.optionsToDisplay && this.optionsToDisplay.length) {\n            if (resetOffset) {\n                this.viewPortOffsetTop = 0;\n            }\n\n            this.virtualScrollSelectedIndex = this.findOptionIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay);\n        }\n    }\n\n    appendOverlay() {\n        if (this.appendTo) {\n            if (this.appendTo === 'body')\n                document.body.appendChild(this.overlay);\n            else\n                DomHandler.appendChild(this.overlay, this.appendTo);\n\n            if (!this.overlay.style.minWidth) {\n                this.overlay.style.minWidth = DomHandler.getWidth(this.containerViewChild.nativeElement) + 'px';\n            }\n        }\n    }\n\n    restoreOverlayAppend() {\n        if (this.overlay && this.appendTo) {\n            this.el.nativeElement.appendChild(this.overlay);\n        }\n    }\n\n    hide() {\n        this.overlayVisible = false;\n\n        if (this.filter && this.resetFilterOnHide) {\n            this.resetFilter();\n        }\n\n        if (this.virtualScroll) {\n            this.virtualAutoScrolled = false;\n        }\n\n        this.cd.markForCheck();\n    }\n\n    alignOverlay() {\n        if (this.overlay) {\n            if (this.appendTo)\n                DomHandler.absolutePosition(this.overlay, this.containerViewChild.nativeElement);\n            else\n                DomHandler.relativePosition(this.overlay, this.containerViewChild.nativeElement);\n        }\n    }\n\n    onInputFocus(event) {\n        this.focused = true;\n        this.onFocus.emit(event);\n    }\n\n    onInputBlur(event) {\n        this.focused = false;\n        this.onBlur.emit(event);\n\n        if (!this.preventModelTouched) {\n            this.onModelTouched();\n        }\n        this.preventModelTouched = false;\n    }\n\n    findPrevEnabledOption(index) {\n        let prevEnabledOption;\n\n        if (this.optionsToDisplay && this.optionsToDisplay.length) {\n            for (let i = (index - 1); 0 <= i; i--) {\n                let option = this.optionsToDisplay[i];\n                if (this.isOptionDisabled(option)) {\n                    continue;\n                }\n                else {\n                    prevEnabledOption = option;\n                    break;\n                }\n            }\n\n            if (!prevEnabledOption) {\n                for (let i = this.optionsToDisplay.length - 1; i >= index ; i--) {\n                    let option = this.optionsToDisplay[i];\n                    if (this.isOptionDisabled(option)) {\n                        continue;\n                    }\n                    else {\n                        prevEnabledOption = option;\n                        break;\n                    }\n                }\n            }\n        }\n\n        return prevEnabledOption;\n    }\n\n    findNextEnabledOption(index) {\n        let nextEnabledOption;\n\n        if (this.optionsToDisplay && this.optionsToDisplay.length) {\n            for (let i = (index + 1); i < this.optionsToDisplay.length; i++) {\n                let option = this.optionsToDisplay[i];\n                if (this.isOptionDisabled(option)) {\n                    continue;\n                }\n                else {\n                    nextEnabledOption = option;\n                    break;\n                }\n            }\n\n            if (!nextEnabledOption) {\n                for (let i = 0; i < index; i++) {\n                    let option = this.optionsToDisplay[i];\n                    if (this.isOptionDisabled(option)) {\n                        continue;\n                    }\n                    else {\n                        nextEnabledOption = option;\n                        break;\n                    }\n                }\n            }\n        }\n\n        return nextEnabledOption;\n    }\n\n    onKeydown(event: KeyboardEvent, search: boolean) {\n        if (this.readonly || !this.optionsToDisplay || this.optionsToDisplay.length === null) {\n            return;\n        }\n\n        switch(event.which) {\n            //down\n            case 40:\n                if (!this.overlayVisible && event.altKey) {\n                    this.show();\n                }\n                else {\n                    if (this.group) {\n                        let selectedItemIndex = this.selectedOption ? this.findOptionGroupIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : -1;\n\n                        if (selectedItemIndex !== -1) {\n                            let nextItemIndex = selectedItemIndex.itemIndex + 1;\n                            if (nextItemIndex < (this.getOptionGroupChildren(this.optionsToDisplay[selectedItemIndex.groupIndex]).length)) {\n                                this.selectItem(event, this.getOptionGroupChildren(this.optionsToDisplay[selectedItemIndex.groupIndex])[nextItemIndex]);\n                                this.selectedOptionUpdated = true;\n                            }\n                            else if (this.optionsToDisplay[selectedItemIndex.groupIndex + 1]) {\n                                this.selectItem(event, this.getOptionGroupChildren(this.optionsToDisplay[selectedItemIndex.groupIndex + 1])[0]);\n                                this.selectedOptionUpdated = true;\n                            }\n                        }\n                        else {\n                            if (this.optionsToDisplay && this.optionsToDisplay.length > 0) {\n                                this.selectItem(event, this.getOptionGroupChildren(this.optionsToDisplay[0])[0]);\n                            }\n                        }\n                    }\n                    else {\n                        let selectedItemIndex = this.selectedOption ? this.findOptionIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : -1;\n                        let nextEnabledOption = this.findNextEnabledOption(selectedItemIndex);\n                        if (nextEnabledOption) {\n                            this.selectItem(event, nextEnabledOption);\n                            this.selectedOptionUpdated = true;\n                        }\n                    }\n                }\n\n                event.preventDefault();\n\n            break;\n\n            //up\n            case 38:\n                if (this.group) {\n                    let selectedItemIndex = this.selectedOption ? this.findOptionGroupIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : -1;\n                    if (selectedItemIndex !== -1) {\n                        let prevItemIndex = selectedItemIndex.itemIndex - 1;\n                        if (prevItemIndex >= 0) {\n                            this.selectItem(event, this.getOptionGroupChildren(this.optionsToDisplay[selectedItemIndex.groupIndex])[prevItemIndex]);\n                            this.selectedOptionUpdated = true;\n                        }\n                        else if (prevItemIndex < 0) {\n                            let prevGroup = this.optionsToDisplay[selectedItemIndex.groupIndex - 1];\n                            if (prevGroup) {\n                                this.selectItem(event, this.getOptionGroupChildren(prevGroup)[this.getOptionGroupChildren(prevGroup).length - 1]);\n                                this.selectedOptionUpdated = true;\n                            }\n                        }\n                    }\n                }\n                else {\n                    let selectedItemIndex = this.selectedOption ? this.findOptionIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : -1;\n                    let prevEnabledOption = this.findPrevEnabledOption(selectedItemIndex);\n                    if (prevEnabledOption) {\n                        this.selectItem(event, prevEnabledOption);\n                        this.selectedOptionUpdated = true;\n                    }\n                }\n\n                event.preventDefault();\n            break;\n\n            //space\n            case 32:\n                if (search) {\n                    if (!this.overlayVisible){\n                        this.show();\n                    }\n                    else {\n                        this.hide();\n                    }\n\n                    event.preventDefault();\n                }\n            break;\n\n            //enter\n            case 13:\n                if (this.overlayVisible && (!this.filter || (this.optionsToDisplay && this.optionsToDisplay.length > 0))) {\n                    this.hide();\n                }\n\n                else if (!this.overlayVisible) {\n                    this.show();\n                }\n\n                event.preventDefault();\n            break;\n\n            //escape and tab\n            case 27:\n            case 9:\n                this.hide();\n            break;\n\n            //search item based on keyboard input\n            default:\n                if (search && !event.metaKey) {\n                    this.search(event);\n                }\n            break;\n        }\n    }\n\n    search(event: KeyboardEvent) {\n        if (this.searchTimeout) {\n            clearTimeout(this.searchTimeout);\n        }\n\n        const char = event.key;\n        this.previousSearchChar = this.currentSearchChar;\n        this.currentSearchChar = char;\n\n        if (this.previousSearchChar === this.currentSearchChar)\n            this.searchValue = this.currentSearchChar;\n        else\n            this.searchValue = this.searchValue ? this.searchValue + char : char;\n\n        let newOption;\n        if (this.group) {\n            let searchIndex = this.selectedOption ? this.findOptionGroupIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : {groupIndex: 0, itemIndex: 0};\n            newOption = this.searchOptionWithinGroup(searchIndex);\n        }\n        else {\n            let searchIndex = this.selectedOption ? this.findOptionIndex(this.getOptionValue(this.selectedOption), this.optionsToDisplay) : -1;\n            newOption = this.searchOption(++searchIndex);\n        }\n\n        if (newOption && !this.isOptionDisabled(newOption)) {\n            this.selectItem(event, newOption);\n            this.selectedOptionUpdated = true;\n        }\n\n        this.searchTimeout = setTimeout(() => {\n            this.searchValue = null;\n        }, 250);\n    }\n\n    searchOption(index) {\n        let option;\n\n        if (this.searchValue) {\n            option = this.searchOptionInRange(index, this.optionsToDisplay.length);\n\n            if (!option) {\n                option = this.searchOptionInRange(0, index);\n            }\n        }\n\n        return option;\n    }\n\n    searchOptionInRange(start, end) {\n        for (let i = start; i < end; i++) {\n            let opt = this.optionsToDisplay[i];\n            if (this.getOptionLabel(opt).toLocaleLowerCase(this.filterLocale).startsWith((this.searchValue as any).toLocaleLowerCase(this.filterLocale)) && !this.isOptionDisabled(opt)) {\n                return opt;\n            }\n        }\n\n        return null;\n    }\n\n    searchOptionWithinGroup(index) {\n        let option;\n\n        if (this.searchValue) {\n            for (let i = index.groupIndex; i < this.optionsToDisplay.length; i++) {\n                for (let j = (index.groupIndex === i) ? (index.itemIndex + 1) : 0; j < this.getOptionGroupChildren(this.optionsToDisplay[i]).length; j++) {\n                    let opt = this.getOptionGroupChildren(this.optionsToDisplay[i])[j];\n                    if (this.getOptionLabel(opt).toLocaleLowerCase(this.filterLocale).startsWith((this.searchValue as any).toLocaleLowerCase(this.filterLocale)) && !this.isOptionDisabled(opt)) {\n                        return opt;\n                    }\n                }\n            }\n\n            if (!option) {\n                for (let i = 0; i <= index.groupIndex; i++) {\n                    for (let j = 0; j < ((index.groupIndex === i) ? index.itemIndex : this.getOptionGroupChildren(this.optionsToDisplay[i]).length); j++) {\n                        let opt = this.getOptionGroupChildren(this.optionsToDisplay[i])[j];\n                        if (this.getOptionLabel(opt).toLocaleLowerCase(this.filterLocale).startsWith((this.searchValue as any).toLocaleLowerCase(this.filterLocale)) && !this.isOptionDisabled(opt)) {\n                            return opt;\n                        }\n                    }\n                }\n            }\n        }\n\n        return null;\n    }\n\n    findOptionIndex(val: any, opts: any[]): number {\n        let index: number = -1;\n        if (opts) {\n            for (let i = 0; i < opts.length; i++) {\n                if ((val == null && this.getOptionValue(opts[i]) == null) || ObjectUtils.equals(val, this.getOptionValue(opts[i]), this.dataKey)) {\n                    index = i;\n                    break;\n                }\n            }\n        }\n\n        return index;\n    }\n\n    findOptionGroupIndex(val: any, opts: any[]): any {\n        let groupIndex, itemIndex;\n\n        if (opts) {\n            for (let i = 0; i < opts.length; i++) {\n                groupIndex = i;\n                itemIndex = this.findOptionIndex(val, this.getOptionGroupChildren(opts[i]));\n\n                if (itemIndex !== -1) {\n                    break;\n                }\n            }\n        }\n\n        if (itemIndex !== -1) {\n            return {groupIndex: groupIndex, itemIndex: itemIndex};\n        }\n        else {\n            return -1;\n        }\n    }\n\n    findOption(val: any, opts: any[], inGroup?: boolean): SelectItem {\n        if (this.group && !inGroup) {\n            let opt: SelectItem;\n            if (opts && opts.length) {\n                for (let optgroup of opts) {\n                    opt = this.findOption(val, this.getOptionGroupChildren(optgroup), true);\n                    if (opt) {\n                        break;\n                    }\n                }\n            }\n            return opt;\n        }\n        else {\n            let index: number = this.findOptionIndex(val, opts);\n            return (index != -1) ? opts[index] : null;\n        }\n    }\n\n    onFilterInputChange(event): void {\n        let inputValue = event.target.value;\n        if (inputValue && inputValue.length) {\n            this._filterValue = inputValue;\n            this.activateFilter();\n        }\n        else {\n            this._filterValue = null;\n            this.optionsToDisplay = this.options;\n        }\n\n        this.optionsChanged = true;\n        this.onFilter.emit({originalEvent: event, filter: this._filterValue});\n    }\n\n    activateFilter() {\n        let searchFields: string[] = (this.filterBy || this.optionLabel || 'label').split(',');\n\n        if (this.options && this.options.length) {\n            if (this.group) {\n                let filteredGroups = [];\n                for (let optgroup of this.options) {\n                    let filteredSubOptions = this.filterService.filter(this.getOptionGroupChildren(optgroup), searchFields, this.filterValue, this.filterMatchMode, this.filterLocale);\n                    if (filteredSubOptions && filteredSubOptions.length) {\n                        filteredGroups.push({...optgroup, ...{[this.optionGroupChildren]: filteredSubOptions}});\n                    }\n                }\n\n                this.optionsToDisplay = filteredGroups;\n            }\n            else {\n                this.optionsToDisplay = this.filterService.filter(this.options, searchFields, this.filterValue, this.filterMatchMode, this.filterLocale);\n            }\n\n            this.optionsChanged = true;\n        }\n    }\n\n    applyFocus(): void {\n        if (this.editable)\n            DomHandler.findSingle(this.el.nativeElement, '.p-dropdown-label.p-inputtext').focus();\n        else\n            DomHandler.findSingle(this.el.nativeElement, 'input[readonly]').focus();\n    }\n\n    focus(): void {\n        this.applyFocus();\n    }\n\n    bindDocumentClickListener() {\n        if (!this.documentClickListener) {\n            const documentTarget: any = this.el ? 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