@ng-select/ng-select/fesm2022/ng-select-ng-select.mjs.map

Angular ng-select - All in One UI Select, Multiselect and Autocomplete

{"version":3,"file":"ng-select-ng-select.mjs","sources":["../../../src/ng-select/lib/value-utils.ts","../../../src/ng-select/lib/ng-templates.directive.ts","../../../src/ng-select/lib/id.ts","../../../src/ng-select/lib/search-helper.ts","../../../src/ng-select/lib/items-list.ts","../../../src/ng-select/lib/ng-select.types.ts","../../../src/ng-select/lib/ng-dropdown-panel.service.ts","../../../src/ng-select/lib/ng-dropdown-panel.component.ts","../../../src/ng-select/lib/ng-option.component.ts","../../../src/ng-select/lib/selection-model.ts","../../../src/ng-select/lib/config.service.ts","../../../src/ng-select/lib/console.service.ts","../../../src/ng-select/lib/ng-select.component.ts","../../../src/ng-select/lib/ng-select.component.html","../../../src/ng-select/lib/ng-select.module.ts","../../../src/ng-select/public-api.ts","../../../src/ng-select/ng-select-ng-select.ts"],"sourcesContent":["const unescapedHTMLExp = /[&<>\"']/g;\nconst hasUnescapedHTMLExp = RegExp(unescapedHTMLExp.source);\nconst htmlEscapes = {\n\t'&': '&amp;',\n\t'<': '&lt;',\n\t'>': '&gt;',\n\t'\"': '&quot;',\n\t\"'\": '&#39;',\n};\n\nexport function escapeHTML(value: string) {\n\treturn value && hasUnescapedHTMLExp.test(value) ? value.replace(unescapedHTMLExp, (chr) => htmlEscapes[chr]) : value;\n}\n\nexport function isDefined(value: any) {\n\treturn value !== undefined && value !== null;\n}\n\nexport function isObject(value: any) {\n\treturn typeof value === 'object' && isDefined(value);\n}\n\nexport function isPromise(value: any) {\n\treturn value instanceof Promise;\n}\n\nexport function isFunction(value: any) {\n\treturn value instanceof Function;\n}\n","import { Directive, ElementRef, Input, OnChanges, SimpleChanges, TemplateRef } from '@angular/core';\nimport { escapeHTML } from './value-utils';\n\n@Directive({\n    selector: '[ngItemLabel]',\n    standalone: true,\n})\nexport class NgItemLabelDirective implements OnChanges {\n\t@Input() ngItemLabel: string;\n\t@Input() escape = true;\n\n\tconstructor(private element: ElementRef<HTMLElement>) {}\n\n\tngOnChanges(changes: SimpleChanges) {\n\t\tthis.element.nativeElement.innerHTML = this.escape ? escapeHTML(this.ngItemLabel) : this.ngItemLabel;\n\t}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-option-tmp]',\n    standalone: true,\n})\nexport class NgOptionTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-optgroup-tmp]',\n    standalone: true,\n})\nexport class NgOptgroupTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-label-tmp]',\n    standalone: true,\n})\nexport class NgLabelTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-multi-label-tmp]',\n    standalone: true,\n})\nexport class NgMultiLabelTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-header-tmp]',\n    standalone: true,\n})\nexport class NgHeaderTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-footer-tmp]',\n    standalone: true,\n})\nexport class NgFooterTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-notfound-tmp]',\n    standalone: true,\n})\nexport class NgNotFoundTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-placeholder-tmp]',\n    standalone: true,\n})\nexport class NgPlaceholderTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-typetosearch-tmp]',\n    standalone: true,\n})\nexport class NgTypeToSearchTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-loadingtext-tmp]',\n    standalone: true,\n})\nexport class NgLoadingTextTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-tag-tmp]',\n    standalone: true,\n})\nexport class NgTagTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n\n@Directive({\n    // eslint-disable-next-line @angular-eslint/directive-selector\n    selector: '[ng-loadingspinner-tmp]',\n    standalone: true,\n})\nexport class NgLoadingSpinnerTemplateDirective {\n\tconstructor(public template: TemplateRef<any>) {}\n}\n","export function newId() {\n\t// First character is an 'a', it's good practice to tag id to begin with a letter\n\treturn 'axxxxxxxxxxx'.replace(/[x]/g, () => {\n\t\t// eslint-disable-next-line no-bitwise\n\t\tconst val = (Math.random() * 16) | 0;\n\t\treturn val.toString(16);\n\t});\n}\n","const diacritics = {\n\t'\\u24B6': 'A',\n\t'\\uFF21': 'A',\n\t'\\u00C0': 'A',\n\t'\\u00C1': 'A',\n\t'\\u00C2': 'A',\n\t'\\u1EA6': 'A',\n\t'\\u1EA4': 'A',\n\t'\\u1EAA': 'A',\n\t'\\u1EA8': 'A',\n\t'\\u00C3': 'A',\n\t'\\u0100': 'A',\n\t'\\u0102': 'A',\n\t'\\u1EB0': 'A',\n\t'\\u1EAE': 'A',\n\t'\\u1EB4': 'A',\n\t'\\u1EB2': 'A',\n\t'\\u0226': 'A',\n\t'\\u01E0': 'A',\n\t'\\u00C4': 'A',\n\t'\\u01DE': 'A',\n\t'\\u1EA2': 'A',\n\t'\\u00C5': 'A',\n\t'\\u01FA': 'A',\n\t'\\u01CD': 'A',\n\t'\\u0200': 'A',\n\t'\\u0202': 'A',\n\t'\\u1EA0': 'A',\n\t'\\u1EAC': 'A',\n\t'\\u1EB6': 'A',\n\t'\\u1E00': 'A',\n\t'\\u0104': 'A',\n\t'\\u023A': 'A',\n\t'\\u2C6F': 'A',\n\t'\\uA732': 'AA',\n\t'\\u00C6': 'AE',\n\t'\\u01FC': 'AE',\n\t'\\u01E2': 'AE',\n\t'\\uA734': 'AO',\n\t'\\uA736': 'AU',\n\t'\\uA738': 'AV',\n\t'\\uA73A': 'AV',\n\t'\\uA73C': 'AY',\n\t'\\u24B7': 'B',\n\t'\\uFF22': 'B',\n\t'\\u1E02': 'B',\n\t'\\u1E04': 'B',\n\t'\\u1E06': 'B',\n\t'\\u0243': 'B',\n\t'\\u0182': 'B',\n\t'\\u0181': 'B',\n\t'\\u24B8': 'C',\n\t'\\uFF23': 'C',\n\t'\\u0106': 'C',\n\t'\\u0108': 'C',\n\t'\\u010A': 'C',\n\t'\\u010C': 'C',\n\t'\\u00C7': 'C',\n\t'\\u1E08': 'C',\n\t'\\u0187': 'C',\n\t'\\u023B': 'C',\n\t'\\uA73E': 'C',\n\t'\\u24B9': 'D',\n\t'\\uFF24': 'D',\n\t'\\u1E0A': 'D',\n\t'\\u010E': 'D',\n\t'\\u1E0C': 'D',\n\t'\\u1E10': 'D',\n\t'\\u1E12': 'D',\n\t'\\u1E0E': 'D',\n\t'\\u0110': 'D',\n\t'\\u018B': 'D',\n\t'\\u018A': 'D',\n\t'\\u0189': 'D',\n\t'\\uA779': 'D',\n\t'\\u01F1': 'DZ',\n\t'\\u01C4': 'DZ',\n\t'\\u01F2': 'Dz',\n\t'\\u01C5': 'Dz',\n\t'\\u24BA': 'E',\n\t'\\uFF25': 'E',\n\t'\\u00C8': 'E',\n\t'\\u00C9': 'E',\n\t'\\u00CA': 'E',\n\t'\\u1EC0': 'E',\n\t'\\u1EBE': 'E',\n\t'\\u1EC4': 'E',\n\t'\\u1EC2': 'E',\n\t'\\u1EBC': 'E',\n\t'\\u0112': 'E',\n\t'\\u1E14': 'E',\n\t'\\u1E16': 'E',\n\t'\\u0114': 'E',\n\t'\\u0116': 'E',\n\t'\\u00CB': 'E',\n\t'\\u1EBA': 'E',\n\t'\\u011A': 'E',\n\t'\\u0204': 'E',\n\t'\\u0206': 'E',\n\t'\\u1EB8': 'E',\n\t'\\u1EC6': 'E',\n\t'\\u0228': 'E',\n\t'\\u1E1C': 'E',\n\t'\\u0118': 'E',\n\t'\\u1E18': 'E',\n\t'\\u1E1A': 'E',\n\t'\\u0190': 'E',\n\t'\\u018E': 'E',\n\t'\\u24BB': 'F',\n\t'\\uFF26': 'F',\n\t'\\u1E1E': 'F',\n\t'\\u0191': 'F',\n\t'\\uA77B': 'F',\n\t'\\u24BC': 'G',\n\t'\\uFF27': 'G',\n\t'\\u01F4': 'G',\n\t'\\u011C': 'G',\n\t'\\u1E20': 'G',\n\t'\\u011E': 'G',\n\t'\\u0120': 'G',\n\t'\\u01E6': 'G',\n\t'\\u0122': 'G',\n\t'\\u01E4': 'G',\n\t'\\u0193': 'G',\n\t'\\uA7A0': 'G',\n\t'\\uA77D': 'G',\n\t'\\uA77E': 'G',\n\t'\\u24BD': 'H',\n\t'\\uFF28': 'H',\n\t'\\u0124': 'H',\n\t'\\u1E22': 'H',\n\t'\\u1E26': 'H',\n\t'\\u021E': 'H',\n\t'\\u1E24': 'H',\n\t'\\u1E28': 'H',\n\t'\\u1E2A': 'H',\n\t'\\u0126': 'H',\n\t'\\u2C67': 'H',\n\t'\\u2C75': 'H',\n\t'\\uA78D': 'H',\n\t'\\u24BE': 'I',\n\t'\\uFF29': 'I',\n\t'\\u00CC': 'I',\n\t'\\u00CD': 'I',\n\t'\\u00CE': 'I',\n\t'\\u0128': 'I',\n\t'\\u012A': 'I',\n\t'\\u012C': 'I',\n\t'\\u0130': 'I',\n\t'\\u00CF': 'I',\n\t'\\u1E2E': 'I',\n\t'\\u1EC8': 'I',\n\t'\\u01CF': 'I',\n\t'\\u0208': 'I',\n\t'\\u020A': 'I',\n\t'\\u1ECA': 'I',\n\t'\\u012E': 'I',\n\t'\\u1E2C': 'I',\n\t'\\u0197': 'I',\n\t'\\u24BF': 'J',\n\t'\\uFF2A': 'J',\n\t'\\u0134': 'J',\n\t'\\u0248': 'J',\n\t'\\u24C0': 'K',\n\t'\\uFF2B': 'K',\n\t'\\u1E30': 'K',\n\t'\\u01E8': 'K',\n\t'\\u1E32': 'K',\n\t'\\u0136': 'K',\n\t'\\u1E34': 'K',\n\t'\\u0198': 'K',\n\t'\\u2C69': 'K',\n\t'\\uA740': 'K',\n\t'\\uA742': 'K',\n\t'\\uA744': 'K',\n\t'\\uA7A2': 'K',\n\t'\\u24C1': 'L',\n\t'\\uFF2C': 'L',\n\t'\\u013F': 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'O',\n\t'\\u1E4E': 'O',\n\t'\\u014C': 'O',\n\t'\\u1E50': 'O',\n\t'\\u1E52': 'O',\n\t'\\u014E': 'O',\n\t'\\u022E': 'O',\n\t'\\u0230': 'O',\n\t'\\u00D6': 'O',\n\t'\\u022A': 'O',\n\t'\\u1ECE': 'O',\n\t'\\u0150': 'O',\n\t'\\u01D1': 'O',\n\t'\\u020C': 'O',\n\t'\\u020E': 'O',\n\t'\\u01A0': 'O',\n\t'\\u1EDC': 'O',\n\t'\\u1EDA': 'O',\n\t'\\u1EE0': 'O',\n\t'\\u1EDE': 'O',\n\t'\\u1EE2': 'O',\n\t'\\u1ECC': 'O',\n\t'\\u1ED8': 'O',\n\t'\\u01EA': 'O',\n\t'\\u01EC': 'O',\n\t'\\u00D8': 'O',\n\t'\\u01FE': 'O',\n\t'\\u0186': 'O',\n\t'\\u019F': 'O',\n\t'\\uA74A': 'O',\n\t'\\uA74C': 'O',\n\t'\\u01A2': 'OI',\n\t'\\uA74E': 'OO',\n\t'\\u0222': 'OU',\n\t'\\u24C5': 'P',\n\t'\\uFF30': 'P',\n\t'\\u1E54': 'P',\n\t'\\u1E56': 'P',\n\t'\\u01A4': 'P',\n\t'\\u2C63': 'P',\n\t'\\uA750': 'P',\n\t'\\uA752': 'P',\n\t'\\uA754': 'P',\n\t'\\u24C6': 'Q',\n\t'\\uFF31': 'Q',\n\t'\\uA756': 'Q',\n\t'\\uA758': 'Q',\n\t'\\u024A': 'Q',\n\t'\\u24C7': 'R',\n\t'\\uFF32': 'R',\n\t'\\u0154': 'R',\n\t'\\u1E58': 'R',\n\t'\\u0158': 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'y',\n\t'\\u01B4': 'y',\n\t'\\u024F': 'y',\n\t'\\u1EFF': 'y',\n\t'\\u24E9': 'z',\n\t'\\uFF5A': 'z',\n\t'\\u017A': 'z',\n\t'\\u1E91': 'z',\n\t'\\u017C': 'z',\n\t'\\u017E': 'z',\n\t'\\u1E93': 'z',\n\t'\\u1E95': 'z',\n\t'\\u01B6': 'z',\n\t'\\u0225': 'z',\n\t'\\u0240': 'z',\n\t'\\u2C6C': 'z',\n\t'\\uA763': 'z',\n\t'\\u0386': '\\u0391',\n\t'\\u0388': '\\u0395',\n\t'\\u0389': '\\u0397',\n\t'\\u038A': '\\u0399',\n\t'\\u03AA': '\\u0399',\n\t'\\u038C': '\\u039F',\n\t'\\u038E': '\\u03A5',\n\t'\\u03AB': '\\u03A5',\n\t'\\u038F': '\\u03A9',\n\t'\\u03AC': '\\u03B1',\n\t'\\u03AD': '\\u03B5',\n\t'\\u03AE': '\\u03B7',\n\t'\\u03AF': '\\u03B9',\n\t'\\u03CA': '\\u03B9',\n\t'\\u0390': '\\u03B9',\n\t'\\u03CC': '\\u03BF',\n\t'\\u03CD': '\\u03C5',\n\t'\\u03CB': '\\u03C5',\n\t'\\u03B0': '\\u03C5',\n\t'\\u03C9': '\\u03C9',\n\t'\\u03C2': '\\u03C3',\n};\n\nexport function stripSpecialChars(text: string): string {\n\tconst match = (a: string): string => diacritics[a] || a;\n\treturn text.replace(/[^\\u0000-\\u007E]/g, match);\n}\n","import { newId } from './id';\nimport { NgSelectComponent } from './ng-select.component';\nimport { NgOption } from './ng-select.types';\nimport * as searchHelper from './search-helper';\nimport { SelectionModel } from './selection-model';\nimport { isDefined, isFunction, isObject } from './value-utils';\n\ntype OptionGroups = Map<string | NgOption, NgOption[]>;\n\nexport class ItemsList {\n\tprivate _groups: OptionGroups;\n\n\tconstructor(\n\t\tprivate _ngSelect: NgSelectComponent,\n\t\tprivate _selectionModel: SelectionModel,\n\t) {}\n\n\tprivate _items: NgOption[] = [];\n\n\tget items(): NgOption[] {\n\t\treturn this._items;\n\t}\n\n\tprivate _filteredItems: NgOption[] = [];\n\n\tget filteredItems(): NgOption[] {\n\t\treturn this._filteredItems;\n\t}\n\n\tprivate _markedIndex = -1;\n\n\tget markedIndex(): number {\n\t\treturn this._markedIndex;\n\t}\n\n\tget selectedItems() {\n\t\treturn this._selectionModel.value;\n\t}\n\n\tget markedItem(): NgOption {\n\t\treturn this._filteredItems[this._markedIndex];\n\t}\n\n\tget noItemsToSelect(): boolean {\n\t\treturn this._ngSelect.hideSelected && this._items.length === this.selectedItems.length;\n\t}\n\n\tget maxItemsSelected(): boolean {\n\t\treturn this._ngSelect.multiple && this._ngSelect.maxSelectedItems <= this.selectedItems.length;\n\t}\n\n\tget lastSelectedItem() {\n\t\tlet i = this.selectedItems.length - 1;\n\t\tfor (; i >= 0; i--) {\n\t\t\tconst item = this.selectedItems[i];\n\t\t\tif (!item.disabled) {\n\t\t\t\treturn item;\n\t\t\t}\n\t\t}\n\t\treturn null;\n\t}\n\n\tsetItems(items: readonly any[]) {\n\t\tthis._items = items.map((item, index) => this.mapItem(item, index));\n\t\tif (this._ngSelect.groupBy) {\n\t\t\tthis._groups = this._groupBy(this._items, this._ngSelect.groupBy);\n\t\t\tthis._items = this._flatten(this._groups);\n\t\t} else {\n\t\t\tthis._groups = new Map();\n\t\t\tthis._groups.set(undefined, this._items);\n\t\t}\n\t\tthis._filteredItems = [...this._items];\n\t}\n\n\tselect(item: NgOption) {\n\t\tif (item.selected || this.maxItemsSelected) {\n\t\t\treturn;\n\t\t}\n\t\tconst multiple = this._ngSelect.multiple;\n\t\tif (!multiple) {\n\t\t\tthis.clearSelected();\n\t\t}\n\n\t\tthis._selectionModel.select(item, multiple, this._ngSelect.selectableGroupAsModel);\n\t\tif (this._ngSelect.hideSelected) {\n\t\t\tthis._hideSelected(item);\n\t\t}\n\t}\n\n\tunselect(item: NgOption) {\n\t\tif (!item.selected) {\n\t\t\treturn;\n\t\t}\n\t\tthis._selectionModel.unselect(item, this._ngSelect.multiple);\n\t\tif (this._ngSelect.hideSelected && isDefined(item.index) && this._ngSelect.multiple) {\n\t\t\tthis._showSelected(item);\n\t\t}\n\t}\n\n\tfindItem(value: any): NgOption {\n\t\tlet findBy: (item: NgOption) => boolean;\n\t\tif (this._ngSelect.compareWith) {\n\t\t\tfindBy = (item) => this._ngSelect.compareWith(item.value, value);\n\t\t} else if (this._ngSelect.bindValue) {\n\t\t\tfindBy = (item) => !item.children && this.resolveNested(item.value, this._ngSelect.bindValue) === value;\n\t\t} else {\n\t\t\tfindBy = (item) =>\n\t\t\t\titem.value === value || (!item.children && item.label && item.label === this.resolveNested(value, this._ngSelect.bindLabel));\n\t\t}\n\t\treturn this._items.find((item) => findBy(item));\n\t}\n\n\taddItem(item: any) {\n\t\tconst option = this.mapItem(item, this._items.length);\n\t\tthis._items.push(option);\n\t\tthis._filteredItems.push(option);\n\t\treturn option;\n\t}\n\n\tclearSelected(keepDisabled = false) {\n\t\tthis._selectionModel.clear(keepDisabled);\n\t\tthis._items.forEach((item) => {\n\t\t\titem.selected = keepDisabled && item.selected && item.disabled;\n\t\t\titem.marked = false;\n\t\t});\n\t\tif (this._ngSelect.hideSelected) {\n\t\t\tthis.resetFilteredItems();\n\t\t}\n\t}\n\n\tfindByLabel(term: string) {\n\t\tterm = searchHelper.stripSpecialChars(term).toLocaleLowerCase();\n\t\treturn this.filteredItems.find((item) => {\n\t\t\tconst label = searchHelper.stripSpecialChars(item.label).toLocaleLowerCase();\n\t\t\treturn label.substr(0, term.length) === term;\n\t\t});\n\t}\n\n\tfilter(term: string): void {\n\t\tif (!term) {\n\t\t\tthis.resetFilteredItems();\n\t\t\treturn;\n\t\t}\n\n\t\tthis._filteredItems = [];\n\t\tterm = this._ngSelect.searchFn ? term : searchHelper.stripSpecialChars(term).toLocaleLowerCase();\n\t\tconst match = this._ngSelect.searchFn || this._defaultSearchFn;\n\t\tconst hideSelected = this._ngSelect.hideSelected;\n\n\t\tfor (const key of Array.from(this._groups.keys())) {\n\t\t\tconst matchedItems = [];\n\t\t\tfor (const item of this._groups.get(key)) {\n\t\t\t\tif (hideSelected && ((item.parent && item.parent.selected) || item.selected)) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t\tconst searchItem = this._ngSelect.searchFn ? item.value : item;\n\t\t\t\tif (match(term, searchItem)) {\n\t\t\t\t\tmatchedItems.push(item);\n\t\t\t\t}\n\t\t\t}\n\t\t\tif (matchedItems.length > 0) {\n\t\t\t\tconst [last] = matchedItems.slice(-1);\n\t\t\t\tif (last.parent) {\n\t\t\t\t\tconst head = this._items.find((x) => x === last.parent);\n\t\t\t\t\tthis._filteredItems.push(head);\n\t\t\t\t}\n\t\t\t\tthis._filteredItems.push(...matchedItems);\n\t\t\t}\n\t\t}\n\t}\n\n\tresetFilteredItems() {\n\t\tif (this._filteredItems.length === this._items.length) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (this._ngSelect.hideSelected && this.selectedItems.length > 0) {\n\t\t\tthis._filteredItems = this._items.filter((x) => !x.selected);\n\t\t} else {\n\t\t\tthis._filteredItems = this._items;\n\t\t}\n\t}\n\n\tunmarkItem() {\n\t\tthis._markedIndex = -1;\n\t}\n\n\tmarkNextItem() {\n\t\tthis._stepToItem(+1);\n\t}\n\n\tmarkPreviousItem() {\n\t\tthis._stepToItem(-1);\n\t}\n\n\tmarkItem(item: NgOption) {\n\t\tthis._markedIndex = this._filteredItems.indexOf(item);\n\t}\n\n\tmarkSelectedOrDefault(markDefault?: boolean) {\n\t\tif (this._filteredItems.length === 0) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst lastMarkedIndex = this._getLastMarkedIndex();\n\t\tif (lastMarkedIndex > -1) {\n\t\t\tthis._markedIndex = lastMarkedIndex;\n\t\t} else {\n\t\t\tthis._markedIndex = markDefault ? this.filteredItems.findIndex((x) => !x.disabled) : -1;\n\t\t}\n\t}\n\n\tresolveNested(option: any, key: string): any {\n\t\tif (!isObject(option)) {\n\t\t\treturn option;\n\t\t}\n\t\tif (key.indexOf('.') === -1) {\n\t\t\treturn option[key];\n\t\t} else {\n\t\t\tconst keys: string[] = key.split('.');\n\t\t\tlet value = option;\n\t\t\tfor (let i = 0, len = keys.length; i < len; ++i) {\n\t\t\t\tif (value == null) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t\tvalue = value[keys[i]];\n\t\t\t}\n\t\t\treturn value;\n\t\t}\n\t}\n\n\tmapItem(item: any, index: number): NgOption {\n\t\tconst label = isDefined(item.$ngOptionLabel) ? item.$ngOptionLabel : this.resolveNested(item, this._ngSelect.bindLabel);\n\t\tconst value = isDefined(item.$ngOptionValue) ? item.$ngOptionValue : item;\n\t\treturn {\n\t\t\tindex,\n\t\t\tlabel: isDefined(label) ? label.toString() : '',\n\t\t\tvalue,\n\t\t\tdisabled: item.disabled,\n\t\t\thtmlId: `${this._ngSelect.dropdownId}-${index}`,\n\t\t};\n\t}\n\n\tmapSelectedItems() {\n\t\tconst multiple = this._ngSelect.multiple;\n\t\tfor (const selected of this.selectedItems) {\n\t\t\tconst value = this._ngSelect.bindValue ? this.resolveNested(selected.value, this._ngSelect.bindValue) : selected.value;\n\t\t\tconst item = isDefined(value) ? this.findItem(value) : null;\n\t\t\tthis._selectionModel.unselect(selected, multiple);\n\t\t\tthis._selectionModel.select(item || selected, multiple, this._ngSelect.selectableGroupAsModel);\n\t\t}\n\n\t\tif (this._ngSelect.hideSelected) {\n\t\t\tthis._filteredItems = this.filteredItems.filter((x) => this.selectedItems.indexOf(x) === -1);\n\t\t}\n\t}\n\n\tprivate _showSelected(item: NgOption) {\n\t\tthis._filteredItems.push(item);\n\t\tif (item.parent) {\n\t\t\tconst parent = item.parent;\n\t\t\tconst parentExists = this._filteredItems.find((x) => x === parent);\n\t\t\tif (!parentExists) {\n\t\t\t\tthis._filteredItems.push(parent);\n\t\t\t}\n\t\t} else if (item.children) {\n\t\t\tfor (const child of item.children) {\n\t\t\t\tchild.selected = false;\n\t\t\t\tthis._filteredItems.push(child);\n\t\t\t}\n\t\t}\n\t\tthis._filteredItems = [...this._filteredItems.sort((a, b) => a.index - b.index)];\n\t}\n\n\tprivate _hideSelected(item: NgOption) {\n\t\tthis._filteredItems = this._filteredItems.filter((x) => x !== item);\n\t\tif (item.parent) {\n\t\t\tconst children = item.parent.children;\n\t\t\tif (children.every((x) => x.selected)) {\n\t\t\t\tthis._filteredItems = this._filteredItems.filter((x) => x !== item.parent);\n\t\t\t}\n\t\t} else if (item.children) {\n\t\t\tthis._filteredItems = this.filteredItems.filter((x) => x.parent !== item);\n\t\t}\n\t}\n\n\tprivate _defaultSearchFn(search: string, opt: NgOption) {\n\t\tconst label = searchHelper.stripSpecialChars(opt.label).toLocaleLowerCase();\n\t\treturn label.indexOf(search) > -1;\n\t}\n\n\tprivate _getNextItemIndex(steps: number) {\n\t\tif (steps > 0) {\n\t\t\treturn this._markedIndex >= this._filteredItems.length - 1 ? 0 : this._markedIndex + 1;\n\t\t}\n\t\treturn this._markedIndex <= 0 ? this._filteredItems.length - 1 : this._markedIndex - 1;\n\t}\n\n\tprivate _stepToItem(steps: number) {\n\t\tif (this._filteredItems.length === 0 || this._filteredItems.every((x) => x.disabled)) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._markedIndex = this._getNextItemIndex(steps);\n\t\tif (this.markedItem.disabled) {\n\t\t\tthis._stepToItem(steps);\n\t\t}\n\t}\n\n\tprivate _getLastMarkedIndex() {\n\t\tif (this._ngSelect.hideSelected) {\n\t\t\treturn -1;\n\t\t}\n\n\t\tif (this._markedIndex > -1 && this.markedItem === undefined) {\n\t\t\treturn -1;\n\t\t}\n\n\t\tconst selectedIndex = this._filteredItems.indexOf(this.lastSelectedItem);\n\t\tif (this.lastSelectedItem && selectedIndex < 0) {\n\t\t\treturn -1;\n\t\t}\n\n\t\treturn Math.max(this.markedIndex, selectedIndex);\n\t}\n\n\tprivate _groupBy(items: NgOption[], prop: string | ((value: any) => any)): OptionGroups {\n\t\tconst groups = new Map<string | NgOption, NgOption[]>();\n\t\tif (items.length === 0) {\n\t\t\treturn groups;\n\t\t}\n\n\t\t// Check if items are already grouped by given key.\n\t\tif (Array.isArray(items[0].value[<string>prop])) {\n\t\t\tfor (const item of items) {\n\t\t\t\tconst children = (item.value[<string>prop] || []).map((x, index) => this.mapItem(x, index));\n\t\t\t\tgroups.set(item, children);\n\t\t\t}\n\t\t\treturn groups;\n\t\t}\n\n\t\tconst isFnKey = isFunction(this._ngSelect.groupBy);\n\t\tconst keyFn = (item: NgOption) => {\n\t\t\tconst key = isFnKey ? (<(value: any) => any>prop)(item.value) : item.value[<string>prop];\n\t\t\treturn isDefined(key) ? key : undefined;\n\t\t};\n\n\t\t// Group items by key.\n\t\tfor (const item of items) {\n\t\t\tconst key = keyFn(item);\n\t\t\tconst group = groups.get(key);\n\t\t\tif (group) {\n\t\t\t\tgroup.push(item);\n\t\t\t} else {\n\t\t\t\tgroups.set(key, [item]);\n\t\t\t}\n\t\t}\n\t\treturn groups;\n\t}\n\n\tprivate _flatten(groups: OptionGroups) {\n\t\tconst isGroupByFn = isFunction(this._ngSelect.groupBy);\n\t\tconst items = [];\n\t\tfor (const key of Array.from(groups.keys())) {\n\t\t\tlet i = items.length;\n\t\t\tif (key === undefined) {\n\t\t\t\tconst withoutGroup = groups.get(undefined) || [];\n\t\t\t\titems.push(\n\t\t\t\t\t...withoutGroup.map((x) => {\n\t\t\t\t\t\tx.index = i++;\n\t\t\t\t\t\treturn x;\n\t\t\t\t\t}),\n\t\t\t\t);\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst isObjectKey = isObject(key);\n\t\t\tconst parent: NgOption = {\n\t\t\t\tlabel: isObjectKey ? '' : String(key),\n\t\t\t\tchildren: undefined,\n\t\t\t\tparent: null,\n\t\t\t\tindex: i++,\n\t\t\t\tdisabled: !this._ngSelect.selectableGroup,\n\t\t\t\thtmlId: newId(),\n\t\t\t};\n\t\t\tconst groupKey = isGroupByFn ? this._ngSelect.bindLabel : <string>this._ngSelect.groupBy;\n\t\t\tconst groupValue =\n\t\t\t\tthis._ngSelect.groupValue ||\n\t\t\t\t(() => {\n\t\t\t\t\tif (isObjectKey) {\n\t\t\t\t\t\treturn (<NgOption>key).value;\n\t\t\t\t\t}\n\t\t\t\t\treturn { [groupKey]: key };\n\t\t\t\t});\n\t\t\tconst children = groups.get(key).map((x) => {\n\t\t\t\tx.parent = parent;\n\t\t\t\tx.children = undefined;\n\t\t\t\tx.index = i++;\n\t\t\t\treturn x;\n\t\t\t});\n\t\t\tparent.children = children;\n\t\t\tparent.value = groupValue(\n\t\t\t\tkey,\n\t\t\t\tchildren.map((x) => x.value),\n\t\t\t);\n\t\t\titems.push(parent);\n\t\t\titems.push(...children);\n\t\t}\n\t\treturn items;\n\t}\n}\n","export interface NgOption {\n\t[name: string]: any;\n\n\tindex?: number;\n\thtmlId?: string;\n\tselected?: boolean;\n\tdisabled?: boolean;\n\tmarked?: boolean;\n\tlabel?: string;\n\tvalue?: string | any;\n\tparent?: NgOption;\n\tchildren?: NgOption[];\n}\n\nexport enum KeyCode {\n\tTab = 9,\n\tEnter = 13,\n\tEsc = 27,\n\tSpace = 32,\n\tArrowUp = 38,\n\tArrowDown = 40,\n\tBackspace = 8,\n}\n\nexport type DropdownPosition = 'top' | 'right' | 'bottom' | 'left' | 'auto';\n","import { Injectable } from '@angular/core';\nexport interface ItemsRangeResult {\n\tscrollHeight: number;\n\ttopPadding: number;\n\tstart: number;\n\tend: number;\n}\n\nexport interface PanelDimensions {\n\titemHeight: number;\n\tpanelHeight: number;\n\titemsPerViewport: number;\n}\n\n@Injectable()\nexport class NgDropdownPanelService {\n\tprivate _dimensions: PanelDimensions = {\n\t\titemHeight: 0,\n\t\tpanelHeight: 0,\n\t\titemsPerViewport: 0,\n\t};\n\n\tget dimensions() {\n\t\treturn this._dimensions;\n\t}\n\n\tcalculateItems(scrollPos: number, itemsLength: number, buffer: number): ItemsRangeResult {\n\t\tconst d = this._dimensions;\n\t\tconst scrollHeight = d.itemHeight * itemsLength;\n\n\t\tconst scrollTop = Math.max(0, scrollPos);\n\t\tconst indexByScrollTop = (scrollTop / scrollHeight) * itemsLength;\n\t\tlet end = Math.min(itemsLength, Math.ceil(indexByScrollTop) + (d.itemsPerViewport + 1));\n\n\t\tconst maxStartEnd = end;\n\t\tconst maxStart = Math.max(0, maxStartEnd - d.itemsPerViewport);\n\t\tlet start = Math.min(maxStart, Math.floor(indexByScrollTop));\n\n\t\tlet topPadding = d.itemHeight * Math.ceil(start) - d.itemHeight * Math.min(start, buffer);\n\t\ttopPadding = !isNaN(topPadding) ? topPadding : 0;\n\t\tstart = !isNaN(start) ? start : -1;\n\t\tend = !isNaN(end) ? end : -1;\n\t\tstart -= buffer;\n\t\tstart = Math.max(0, start);\n\t\tend += buffer;\n\t\tend = Math.min(itemsLength, end);\n\n\t\treturn {\n\t\t\ttopPadding,\n\t\t\tscrollHeight,\n\t\t\tstart,\n\t\t\tend,\n\t\t};\n\t}\n\n\tsetDimensions(itemHeight: number, panelHeight: number) {\n\t\tconst itemsPerViewport = Math.max(1, Math.floor(panelHeight / itemHeight));\n\t\tthis._dimensions = {\n\t\t\titemHeight,\n\t\t\tpanelHeight,\n\t\t\titemsPerViewport,\n\t\t};\n\t}\n\n\tgetScrollTo(itemTop: number, itemHeight: number, lastScroll: number) {\n\t\tconst { panelHeight } = this.dimensions;\n\t\tconst itemBottom = itemTop + itemHeight;\n\t\tconst top = lastScroll;\n\t\tconst bottom = top + panelHeight;\n\n\t\tif (panelHeight >= itemBottom && lastScroll === itemTop) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif (itemBottom > bottom) {\n\t\t\treturn top + itemBottom - bottom;\n\t\t} else if (itemTop <= top) {\n\t\t\treturn itemTop;\n\t\t}\n\n\t\treturn null;\n\t}\n}\n","import {DOCUMENT, NgTemplateOutlet} from '@angular/common';\nimport {\n\tbooleanAttribute,\n\tChangeDetectionStrategy,\n\tComponent,\n\tElementRef,\n\tEventEmitter,\n\tInject,\n\tInput,\n\tNgZone,\n\tOnChanges,\n\tOnDestroy,\n\tOnInit,\n\tOptional,\n\tOutput,\n\tRenderer2,\n\tSimpleChanges,\n\tTemplateRef,\n\tViewChild,\n\tViewEncapsulation,\n} from '@angular/core';\nimport { animationFrameScheduler, asapScheduler, fromEvent, merge, Subject } from 'rxjs';\nimport { auditTime, takeUntil } from 'rxjs/operators';\nimport { NgDropdownPanelService, PanelDimensions } from './ng-dropdown-panel.service';\n\nimport { DropdownPosition } from './ng-select.types';\nimport { NgOption } from './ng-select.types';\nimport { isDefined } from './value-utils';\n\nconst CSS_POSITIONS: Readonly<string[]> = ['top', 'right', 'bottom', 'left'];\nconst SCROLL_SCHEDULER = typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;\n\n@Component({\n\tchangeDetection: ChangeDetectionStrategy.OnPush,\n\tencapsulation: ViewEncapsulation.None,\n\tselector: 'ng-dropdown-panel',\n\tstandalone: true,\n    template: `\n        @if (headerTemplate) {\n          <div class=\"ng-dropdown-header\">\n            <ng-container [ngTemplateOutlet]=\"headerTemplate\" [ngTemplateOutletContext]=\"{ searchTerm: filterValue }\"/>\n          </div>\n        }\n        <div #scroll role=\"listbox\" class=\"ng-dropdown-panel-items scroll-host\">\n            <div #padding [class.total-padding]=\"virtualScroll\"></div>\n            <div #content [class.scrollable-content]=\"virtualScroll && items.length\">\n                <ng-content/>\n            </div>\n        </div>\n        @if (footerTemplate) {\n          <div class=\"ng-dropdown-footer\">\n            <ng-container [ngTemplateOutlet]=\"footerTemplate\" [ngTemplateOutletContext]=\"{ searchTerm: filterValue }\"/>\n          </div>\n        }\n    `,\n    imports: [\n        NgTemplateOutlet,\n    ],\n})\nexport class NgDropdownPanelComponent implements OnInit, OnChanges, OnDestroy {\n\t@Input() items: NgOption[] = [];\n\t@Input() markedItem: NgOption;\n\t@Input() position: DropdownPosition = 'auto';\n\t@Input() appendTo: string;\n\t@Input() bufferAmount:number;\n\t@Input({ transform: booleanAttribute }) virtualScroll = false;\n\t@Input() headerTemplate: TemplateRef<any>;\n\t@Input() footerTemplate: TemplateRef<any>;\n\t@Input() filterValue: string = null;\n\n\t@Output() update = new EventEmitter<any[]>();\n\t@Output() scroll = new EventEmitter<{ start: number; end: number }>();\n\t@Output() scrollToEnd = new EventEmitter<void>();\n\t@Output() outsideClick = new EventEmitter<void>();\n\n\t@ViewChild('content', { read: ElementRef, static: true }) contentElementRef: ElementRef;\n\t@ViewChild('scroll', { read: ElementRef, static: true }) scrollElementRef: ElementRef;\n\t@ViewChild('padding', { read: ElementRef, static: true }) paddingElementRef: ElementRef;\n\n\tprivate readonly _destroy$ = new Subject<void>();\n\tprivate readonly _dropdown: HTMLElement;\n\tprivate _virtualPadding: HTMLElement;\n\tprivate _scrollablePanel: HTMLElement;\n\tprivate _contentPanel: HTMLElement;\n\tprivate _select: HTMLElement;\n\tprivate _parent: HTMLElement;\n\tprivate _scrollToEndFired = false;\n\tprivate _updateScrollHeight = false;\n\tprivate _lastScrollPosition = 0;\n\n\tconstructor(\n\t\tprivate _renderer: Renderer2,\n\t\tprivate _zone: NgZone,\n\t\tprivate _panelService: NgDropdownPanelService,\n\t\t_elementRef: ElementRef,\n\t\t@Optional() @Inject(DOCUMENT) private _document: any,\n\t) {\n\t\tthis._dropdown = _elementRef.nativeElement;\n\t}\n\n\tprivate _currentPosition: DropdownPosition;\n\n\tget currentPosition(): DropdownPosition {\n\t\treturn this._currentPosition;\n\t}\n\n\tprivate _itemsLength: number;\n\n\tprivate get itemsLength() {\n\t\treturn this._itemsLength;\n\t}\n\n\tprivate set itemsLength(value: number) {\n\t\tif (value !== this._itemsLength) {\n\t\t\tthis._itemsLength = value;\n\t\t\tthis._onItemsLengthChanged();\n\t\t}\n\t}\n\n\tprivate get _startOffset() {\n\t\tif (this.markedItem) {\n\t\t\tconst { itemHeight, panelHeight } = this._panelService.dimensions;\n\t\t\tconst offset = this.markedItem.index * itemHeight;\n\t\t\treturn panelHeight > offset ? 0 : offset;\n\t\t}\n\t\treturn 0;\n\t}\n\n\tngOnInit() {\n\t\tthis._select = this._dropdown.parentElement;\n\t\tthis._virtualPadding = this.paddingElementRef.nativeElement;\n\t\tthis._scrollablePanel = this.scrollElementRef.nativeElement;\n\t\tthis._contentPanel = this.contentElementRef.nativeElement;\n\t\tthis._handleScroll();\n\t\tthis._handleOutsideClick();\n\t\tthis._appendDropdown();\n\t\tthis._setupMousedownListener();\n\t}\n\n\tngOnChanges(changes: SimpleChanges) {\n\t\tif (changes.items) {\n\t\t\tconst change = changes.items;\n\t\t\tthis._onItemsChange(change.currentValue, change.firstChange);\n\t\t}\n\t}\n\n\tngOnDestroy() {\n\t\tthis._destroy$.next();\n\t\tthis._destroy$.complete();\n\t\tthis._destroy$.unsubscribe();\n\t\tif (this.appendTo) {\n\t\t\tthis._renderer.removeChild(this._dropdown.parentNode, this._dropdown);\n\t\t}\n\t}\n\n\tscrollTo(option: NgOption, startFromOption = false) {\n\t\tif (!option) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst index = this.items.indexOf(option);\n\t\tif (index < 0 || index >= this.itemsLength) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet scrollTo;\n\t\tif (this.virtualScroll) {\n\t\t\tconst itemHeight = this._panelService.dimensions.itemHeight;\n\t\t\tscrollTo = this._panelService.getScrollTo(index * itemHeight, itemHeight, this._lastScrollPosition);\n\t\t} else {\n\t\t\tconst item: HTMLElement = this._dropdown.querySelector(`#${option.htmlId}`);\n\t\t\tconst lastScroll = startFromOption ? item.offsetTop : this._lastScrollPosition;\n\t\t\tscrollTo = this._panelService.getScrollTo(item.offsetTop, item.clientHeight, lastScroll);\n\t\t}\n\n\t\tif (isDefined(scrollTo)) {\n\t\t\tthis._scrollablePanel.scrollTop = scrollTo;\n\t\t}\n\t}\n\n\tscrollToTag() {\n\t\tconst panel = this._scrollablePanel;\n\t\tpanel.scrollTop = panel.scrollHeight - panel.clientHeight;\n\t}\n\n\tadjustPosition() {\n\t\tthis._updateYPosition();\n\t}\n\n\tprivate _handleDropdownPosition() {\n\t\tthis._currentPosition = this._calculateCurrentPosition(this._dropdown);\n\t\tif (CSS_POSITIONS.includes(this._currentPosition)) {\n\t\t\tthis._updateDropdownClass(this._currentPosition);\n\t\t} else {\n\t\t\tthis._updateDropdownClass('bottom');\n\t\t}\n\n\t\tif (this.appendTo) {\n\t\t\tthis._updateYPosition();\n\t\t}\n\n\t\tthis._dropdown.style.opacity = '1';\n\t}\n\n\tprivate _updateDropdownClass(currentPosition: string) {\n\t\tCSS_POSITIONS.forEach((position) => {\n\t\t\tconst REMOVE_CSS_CLASS = `ng-select-${position}`;\n\t\t\tthis._renderer.removeClass(this._dropdown, REMOVE_CSS_CLASS);\n\t\t\tthis._renderer.removeClass(this._select, REMOVE_CSS_CLASS);\n\t\t});\n\n\t\tconst ADD_CSS_CLASS = `ng-select-${currentPosition}`;\n\t\tthis._renderer.addClass(this._dropdown, ADD_CSS_CLASS);\n\t\tthis._renderer.addClass(this._select, ADD_CSS_CLASS);\n\t}\n\n\tprivate _handleScroll() {\n\t\tthis._zone.runOutsideAngular(() => {\n\t\t\tfromEvent(this.scrollElementRef.nativeElement, 'scroll')\n\t\t\t\t.pipe(takeUntil(this._destroy$), auditTime(0, SCROLL_SCHEDULER))\n\t\t\t\t.subscribe((e: { path; composedPath; target }) => {\n\t\t\t\t\tconst path = e.path || (e.composedPath && e.composedPath());\n\t\t\t\t\tif (!path || (path.length === 0 && !e.target)) {\n\t\t\t\t\t\treturn;\n\t\t\t\t\t}\n\t\t\t\t\tconst scrollTop = !path || path.length === 0 ? e.target.scrollTop : path[0].scrollTop;\n\t\t\t\t\tthis._onContentScrolled(scrollTop);\n\t\t\t\t});\n\t\t});\n\t}\n\n\tprivate _handleOutsideClick() {\n\t\tif (!this._document) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._zone.runOutsideAngular(() => {\n\t\t\tmerge(fromEvent(this._document, 'touchstart', { capture: true }), fromEvent(this._document, 'click', { capture: true }))\n\t\t\t\t.pipe(takeUntil(this._destroy$))\n\t\t\t\t.subscribe(($event) => this._checkToClose($event));\n\t\t});\n\t}\n\n\tprivate _checkToClose($event: any) {\n\t\tif (this._select.contains($event.target) || this._dropdown.contains($event.target)) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst path = $event.path || ($event.composedPath && $event.composedPath());\n\t\tif ($event.target && $event.target.shadowRoot && path && path[0] && this._select.contains(path[0])) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._zone.run(() => this.outsideClick.emit());\n\t}\n\n\tprivate _onItemsChange(items: NgOption[], firstChange: boolean) {\n\t\tthis.items = items || [];\n\t\tthis._scrollToEndFired = false;\n\t\tthis.itemsLength = items.length;\n\n\t\tif (this.virtualScroll) {\n\t\t\tthis._updateItemsRange(firstChange);\n\t\t} else {\n\t\t\tthis._setVirtualHeight();\n\t\t\tthis._updateItems(firstChange);\n\t\t}\n\t}\n\n\tprivate _updateItems(firstChange: boolean) {\n\t\tthis.update.emit(this.items);\n\t\tif (firstChange === false) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._zone.runOutsideAngular(() => {\n\t\t\tPromise.resolve().then(() => {\n\t\t\t\tconst panelHeight = this._scrollablePanel.clientHeight;\n\t\t\t\tthis._panelService.setDimensions(0, panelHeight);\n\t\t\t\tthis._handleDropdownPosition();\n\t\t\t\tthis.scrollTo(this.markedItem, firstChange);\n\t\t\t});\n\t\t});\n\t}\n\n\tprivate _updateItemsRange(firstChange: boolean) {\n\t\tthis._zone.runOutsideAngular(() => {\n\t\t\tthis._measureDimensions().then(() => {\n\t\t\t\tif (firstChange) {\n\t\t\t\t\tthis._renderItemsRange(this._startOffset);\n\t\t\t\t\tthis._handleDropdownPosition();\n\t\t\t\t} else {\n\t\t\t\t\tthis._renderItemsRange();\n\t\t\t\t}\n\t\t\t});\n\t\t});\n\t}\n\n\tprivate _onContentScrolled(scrollTop: number) {\n\t\tif (this.virtualScroll) {\n\t\t\tthis._renderItemsRange(scrollTop);\n\t\t}\n\t\tthis._lastScrollPosition = scrollTop;\n\t\tthis._fireScrollToEnd(scrollTop);\n\t}\n\n\tprivate _updateVirtualHeight(height: number) {\n\t\tif (this._updateScrollHeight) {\n\t\t\tthis._virtualPadding.style.height = `${height}px`;\n\t\t\tthis._updateScrollHeight = false;\n\t\t}\n\t}\n\n\tprivate _setVirtualHeight() {\n\t\tif (!this._virtualPadding) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._virtualPadding.style.height = `0px`;\n\t}\n\n\tprivate _onItemsLengthChanged() {\n\t\tthis._updateScrollHeight = true;\n\t}\n\n\tprivate _renderItemsRange(scrollTop = null) {\n\t\tif (scrollTop && this._lastScrollPosition === scrollTop) {\n\t\t\treturn;\n\t\t}\n\n\t\tscrollTop = scrollTop || this._scrollablePanel.scrollTop;\n\t\tconst range = this._panelService.calculateItems(scrollTop, this.itemsLength, this.bufferAmount);\n\t\tthis._updateVirtualHeight(range.scrollHeight);\n\t\tthis._contentPanel.style.transform = `translateY(${range.topPadding}px)`;\n\n\t\tthis._zone.run(() => {\n\t\t\tthis.update.emit(this.items.slice(range.start, range.end));\n\t\t\tthis.scroll.emit({ start: range.start, end: range.end });\n\t\t});\n\n\t\tif (isDefined(scrollTop) && this._lastScrollPosition === 0) {\n\t\t\tthis._scrollablePanel.scrollTop = scrollTop;\n\t\t\tthis._lastScrollPosition = scrollTop;\n\t\t}\n\t}\n\n\tprivate _measureDimensions(): Promise<PanelDimensions> {\n\t\tif (this._panelService.dimensions.itemHeight > 0 || this.itemsLength === 0) {\n\t\t\treturn Promise.resolve(this._panelService.dimensions);\n\t\t}\n\n\t\tconst [first] = this.items;\n\t\tthis.update.emit([first]);\n\n\t\treturn Promise.resolve().then(() => {\n\t\t\tconst option = this._dropdown.querySelector(`#${first.htmlId}`);\n\t\t\tconst optionHeight = option.clientHeight;\n\t\t\tthis._virtualPadding.style.height = `${optionHeight * this.itemsLength}px`;\n\t\t\tconst panelHeight = this._scrollablePanel.clientHeight;\n\t\t\tthis._panelService.setDimensions(optionHeight, panelHeight);\n\n\t\t\treturn this._panelService.dimensions;\n\t\t});\n\t}\n\n\tprivate _fireScrollToEnd(scrollTop: number) {\n\t\tif (this._scrollToEndFired || scrollTop === 0) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst padding = this.virtualScroll ? this._virtualPadding : this._contentPanel;\n\n\t\tif (scrollTop + this._dropdown.clientHeight >= padding.clientHeight - 1) {\n\t\t\tthis._zone.run(() => this.scrollToEnd.emit());\n\t\t\tthis._scrollToEndFired = true;\n\t\t}\n\t}\n\n\tprivate _calculateCurrentPosition(dropdownEl: HTMLElement) {\n\t\tif (this.position !== 'auto') {\n\t\t\treturn this.position;\n\t\t}\n\t\tconst selectRect: ClientRect = this._select.getBoundingClientRect();\n\t\tconst scrollTop = document.documentElement.scrollTop || document.body.scrollTop;\n\t\tconst offsetTop = selectRect.top + window.pageYOffset;\n\t\tconst height = selectRect.height;\n\t\tconst dropdownHeight = dropdownEl.getBoundingClientRect().height;\n\t\tif (offsetTop + height + dropdownHeight > scrollTop + document.documentElement.clientHeight) {\n\t\t\treturn 'top';\n\t\t} else {\n\t\t\treturn 'bottom';\n\t\t}\n\t}\n\n\tprivate _appendDropdown() {\n\t\tif (!this.appendTo) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._parent = document.querySelector(this.appendTo);\n\t\tif (!this._parent) {\n\t\t\tthrow new Error(`appendTo selector ${this.appendTo} did