igniteui-angular
Version:
Ignite UI for Angular is a dependency-free Angular toolkit for building modern web apps
576 lines • 55.5 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { ChangeDetectorRef, Component, ContentChild, ElementRef, forwardRef, Inject, QueryList, ContentChildren } from '@angular/core';
import { takeUntil, take } from 'rxjs/operators';
import { IgxForOfDirective } from '../directives/for-of/for_of.directive';
import { IGX_COMBO_COMPONENT } from './combo.common';
import { Navigate } from '../drop-down/drop-down.common';
import { IGX_DROPDOWN_BASE } from '../drop-down/drop-down.common';
import { IgxDropDownComponent } from '../drop-down/drop-down.component';
import { DropDownActionKey } from '../drop-down/drop-down.common';
import { IgxComboAddItemComponent } from './combo-add-item.component';
import { IgxComboAPIService } from './combo.api';
import { IgxSelectionAPIService } from '../core/selection';
import { IgxComboItemComponent } from './combo-item.component';
/**
* @hidden
*/
export class IgxComboDropDownComponent extends IgxDropDownComponent {
/**
* @param {?} elementRef
* @param {?} cdr
* @param {?} selection
* @param {?} combo
* @param {?} comboAPI
*/
constructor(elementRef, cdr, selection, combo, comboAPI) {
super(elementRef, cdr, selection);
this.elementRef = elementRef;
this.cdr = cdr;
this.selection = selection;
this.combo = combo;
this.comboAPI = comboAPI;
this._scrollPosition = 0;
/**
* @hidden
* \@internal
*/
this.children = null;
this.scrollHandler = () => {
this.comboAPI.disableTransitions = true;
};
}
/**
* @protected
* @return {?}
*/
get scrollContainer() {
return this.verticalScrollContainer.dc.location.nativeElement;
}
/**
* @protected
* @return {?}
*/
get isScrolledToLast() {
/** @type {?} */
const scrollTop = this.verticalScrollContainer.getVerticalScroll().scrollTop;
/** @type {?} */
const scrollHeight = this.verticalScrollContainer.getVerticalScroll().scrollHeight;
return Math.floor(scrollTop + this.verticalScrollContainer.igxForContainerSize) === scrollHeight;
}
/**
* @protected
* @return {?}
*/
get lastVisibleIndex() {
return this.combo.totalItemCount ?
Math.floor(this.combo.itemsMaxHeight / this.combo.itemHeight) :
this.items.length - 1;
}
/**
* @hidden \@internal
* @return {?}
*/
onFocus() {
this._focusedItem = this._focusedItem || this.items[0];
if (this._focusedItem) {
this._focusedItem.focused = true;
}
}
/**
* @hidden \@internal
* @param {?=} evt
* @return {?}
*/
onBlur(evt) {
if (this._focusedItem) {
this._focusedItem.focused = false;
this._focusedItem = null;
}
}
/**
* @hidden \@internal
* @return {?}
*/
onToggleOpened() {
this.onOpened.emit();
}
/**
* @hidden
* @return {?}
*/
navigatePrev() {
if (this._focusedItem.itemIndex === 0 && this.verticalScrollContainer.state.startIndex === 0) {
this.combo.focusSearchInput(false);
}
else {
super.navigatePrev();
}
}
/**
* @hidden \@internal
* @return {?}
*/
navigateFirst() {
/** @type {?} */
const vContainer = this.verticalScrollContainer;
if (vContainer.state.startIndex === 0) {
super.navigateItem(0);
return;
}
vContainer.scrollTo(0);
this.subscribeNext(vContainer, () => {
this.combo.triggerCheck();
super.navigateItem(0);
this.combo.triggerCheck();
});
}
/**
* @hidden \@internal
* @return {?}
*/
navigateLast() {
/** @type {?} */
const vContainer = this.verticalScrollContainer;
/** @type {?} */
const scrollTarget = this.combo.totalItemCount ?
this.combo.totalItemCount - 1 :
Math.max(this.combo.data.length - 1, vContainer.igxForOf.length - 1);
if (vContainer.igxForOf.length <= vContainer.state.startIndex + vContainer.state.chunkSize) {
super.navigateItem(this.items.length - 1);
return;
}
vContainer.scrollTo(scrollTarget);
this.subscribeNext(vContainer, () => {
this.combo.triggerCheck();
super.navigateItem(this.items.length - 1);
this.combo.triggerCheck();
});
}
/**
* @private
* @param {?} direction
* @return {?}
*/
navigateRemoteItem(direction) {
/** @type {?} */
const vContainer = this.verticalScrollContainer;
vContainer.addScrollTop(direction * this.combo.itemHeight);
this.subscribeNext(vContainer, () => {
if (direction === Navigate.Up) {
super.navigateItem(0);
}
else {
super.navigateItem(this.focusedItem.itemIndex);
}
});
}
/**
* @hidden \@internal
* @param {?} item
* @return {?}
*/
selectItem(item) {
if (item === null || item === undefined) {
return;
}
this.comboAPI.set_selected_item(item.itemID);
this._focusedItem = item;
}
/**
* @private
* @param {?=} newIndex
* @return {?}
*/
navigateDown(newIndex) {
/** @type {?} */
const vContainer = this.verticalScrollContainer;
/** @type {?} */
const allData = vContainer.igxForOf;
/** @type {?} */
const extraScroll = this.combo.isAddButtonVisible() ? 1 : 0;
/** @type {?} */
const focusedItem = this.focusedItem;
/** @type {?} */
const items = this.items;
/** @type {?} */
const children = this.sortedChildren;
if (focusedItem) {
if (this.isAddItemFocused()) {
return;
}
if (focusedItem.value === allData[allData.length - 1]) {
this.focusAddItemButton();
return;
}
}
/** @type {?} */
let targetDataIndex = newIndex === -1 ? this.itemIndexInData(this.focusedItem.itemIndex) + 1 : this.itemIndexInData(newIndex);
/** @type {?} */
const lastLoadedIndex = vContainer.state.startIndex + vContainer.state.chunkSize - 1;
if (targetDataIndex < lastLoadedIndex) { // If no scroll is required
if (newIndex !== -1 || newIndex === children.length - 1 - extraScroll) { // Use normal nav for visible items
super.navigateItem(newIndex);
}
}
else if (this.isScrolledToLast && targetDataIndex === lastLoadedIndex) { // If already at bottom and target is last item
super.navigateItem(items.length - 1 - extraScroll); // Focus the last item (excluding Add Button)
}
else { // If scroll is required
// If scroll is required
// If item is header, find next non-header index
/** @type {?} */
const addedIndex = allData[targetDataIndex].isHeader ? this.findNextFocusableItem(targetDataIndex, Navigate.Down, allData) : 0;
targetDataIndex += addedIndex; // Add steps to the target index
if (addedIndex === -1) { // If there are no more non-header items & add button is visible
this.focusAddItemButton();
}
else if (targetDataIndex === allData.length - 1 && !this.isScrolledToLast) {
// If target is very last loaded item, but scroll is not at the bottom (item is in DOM but not visible)
vContainer.scrollTo(targetDataIndex); // This will not trigger `onChunkLoad`
super.navigateItem(items.length - 1 - extraScroll); // Target last item (excluding Add Button)
}
else { // Perform virtual scroll
this.subscribeNext(vContainer, () => {
// children = all items in the DD (including addItemButton)
// length - 2 instead of -1, because we do not want to focus the last loaded item (in DOM, but not visible)
// Focus last item (excluding Add Button)
super.navigateItem(!addedIndex ? children[children.length - 1 - extraScroll].itemIndex : this.items.length - 2);
});
vContainer.scrollTo(targetDataIndex); // Perform virtual scroll
}
}
}
/**
* @private
* @param {?=} newIndex
* @return {?}
*/
navigateUp(newIndex) {
/** @type {?} */
const vContainer = this.verticalScrollContainer;
/** @type {?} */
const allData = vContainer.igxForOf;
/** @type {?} */
const focusedItem = this.focusedItem;
if (focusedItem.value === allData.find(e => !e.isHeader && !e.hidden)) { // If this is the very first non-header item
this.focusComboSearch(); // Focus combo search
return;
}
/** @type {?} */
let targetDataIndex = newIndex === -1 ? this.itemIndexInData(focusedItem.itemIndex) - 1 : this.itemIndexInData(newIndex);
if (newIndex !== -1) { // If no scroll is required
if (this.isScrolledToLast && targetDataIndex === vContainer.state.startIndex) {
// If virt scrollbar is @ bottom, first item is in DOM but not visible
vContainer.scrollTo(targetDataIndex); // This will not trigger `onChunkLoad`
super.navigateItem(0); // Focus first visible item
}
else {
super.navigateItem(newIndex); // Use normal navigation
}
}
else { // Perform virtual scroll
// Perform virtual scroll
// If item is header, find next non-header index
/** @type {?} */
const addedIndex = allData[targetDataIndex].isHeader ? this.findNextFocusableItem(targetDataIndex, Navigate.Up, allData) : 0;
targetDataIndex -= addedIndex; // Add steps to targetDataIndex
if (addedIndex === -1) { // If there is no non-header
vContainer.scrollTo(0);
this.focusComboSearch(); // Focus combo search;
}
else {
this.subscribeNext(vContainer, () => {
super.navigateItem(0); // Focus the first loaded item
});
vContainer.scrollTo(targetDataIndex); // Perform virtual scroll
}
}
}
/**
* @protected
* @param {?} direction
* @param {?=} currentIndex
* @return {?}
*/
navigate(direction, currentIndex) {
/** @type {?} */
let index = -1;
if (this._focusedItem) {
index = currentIndex ? currentIndex : this._focusedItem.itemIndex;
}
/** @type {?} */
const newIndex = this.getNearestSiblingFocusableItemIndex(index, direction);
/** @type {?} */
const vContainer = this.verticalScrollContainer;
/** @type {?} */
const notVirtual = vContainer.dc.instance.notVirtual;
if (notVirtual || !direction) { // If list has no scroll OR no direction is passed
super.navigateItem(newIndex); // use default scroll
}
else if (vContainer && vContainer.totalItemCount && vContainer.totalItemCount !== 0) { // Remote scroll
if (newIndex !== -1 &&
this.items[newIndex].isVisible(direction)) {
this.navigateItem(newIndex);
}
else {
this.navigateRemoteItem(direction);
}
}
else {
if (direction === Navigate.Up) { // Navigate UP
this.navigateUp(newIndex);
}
else if (direction === Navigate.Down) { // Navigate DOWN
this.navigateDown(newIndex);
}
}
}
/**
* @private
* @param {?} index
* @return {?}
*/
itemIndexInData(index) {
return this.sortedChildren.findIndex(e => e.itemIndex === index) + this.verticalScrollContainer.state.startIndex;
}
/**
* @private
* @param {?} indexInData
* @param {?} direction
* @param {?} data
* @return {?}
*/
findNextFocusableItem(indexInData, direction, data) {
if (direction === Navigate.Up) {
return [...data].splice(0, indexInData + 1).reverse().findIndex(e => !e.isHeader);
}
return [...data].splice(indexInData, data.length - 1).findIndex(e => !e.isHeader);
}
/**
* @private
* @return {?}
*/
focusComboSearch() {
this.combo.focusSearchInput(false);
if (this.focusedItem) {
this.focusedItem.focused = false;
}
this.focusedItem = null;
}
/**
* @private
* @return {?}
*/
focusAddItemButton() {
if (this.combo.isAddButtonVisible()) {
super.navigateItem(this.items.length - 1);
}
}
/**
* @private
* @param {?} virtualContainer
* @param {?} callback
* @return {?}
*/
subscribeNext(virtualContainer, callback) {
virtualContainer.onChunkLoad.pipe(take(1), takeUntil(this.destroy$)).subscribe({
next: (e) => {
callback(e);
}
});
}
/**
* @protected
* @param {?} newItem
* @return {?}
*/
scrollToHiddenItem(newItem) { }
/**
* @protected
* @return {?}
*/
get sortedChildren() {
if (this.children !== undefined) {
return this.children.toArray()
.sort((a, b) => {
return a.index - b.index;
});
}
return null;
}
/**
* Get all non-header items
*
* ```typescript
* let myDropDownItems = this.dropdown.items;
* ```
* @return {?}
*/
get items() {
/** @type {?} */
const items = [];
if (this.children !== undefined) {
/** @type {?} */
const sortedChildren = (/** @type {?} */ (this.sortedChildren));
for (const child of sortedChildren) {
if (!child.isHeader) {
items.push(child);
}
}
}
return items;
}
/**
* @protected
* @return {?}
*/
scrollToItem() {
}
/**
* @hidden \@internal
* @param {?} e
* @return {?}
*/
onToggleClosing(e) {
super.onToggleClosing(e);
this._scrollPosition = this.verticalScrollContainer.getVerticalScroll().scrollTop;
}
/**
* @hidden \@internal
* @return {?}
*/
updateScrollPosition() {
this.verticalScrollContainer.getVerticalScroll().scrollTop = this._scrollPosition;
}
/**
* @hidden \@internal
* @param {?} key
* @return {?}
*/
onItemActionKey(key) {
switch (key) {
case DropDownActionKey.ENTER:
this.handleEnter();
break;
case DropDownActionKey.SPACE:
this.handleSpace();
break;
case DropDownActionKey.ESCAPE:
this.close();
}
}
/**
* @private
* @return {?}
*/
handleEnter() {
if (this.isAddItemFocused()) {
this.combo.addItemToCollection();
}
else {
this.close();
}
}
/**
* @private
* @return {?}
*/
handleSpace() {
if (this.isAddItemFocused()) {
return;
}
else {
this.selectItem(this.focusedItem);
}
}
/**
* @private
* @return {?}
*/
isAddItemFocused() {
return this.focusedItem instanceof IgxComboAddItemComponent;
}
/**
* @return {?}
*/
ngAfterViewInit() {
this.verticalScrollContainer.getVerticalScroll().addEventListener('scroll', this.scrollHandler);
}
/**
* @hidden \@internal
* @return {?}
*/
ngOnDestroy() {
this.verticalScrollContainer.getVerticalScroll().removeEventListener('scroll', this.scrollHandler);
this.destroy$.next(true);
this.destroy$.complete();
}
}
IgxComboDropDownComponent.decorators = [
{ type: Component, args: [{
selector: 'igx-combo-drop-down',
template: "<div class=\"igx-drop-down__list\" igxToggle [style.width]=\"width\" [style.height]=\"height\"\n[style.maxHeight]=\"maxHeight\" [attr.id]=\"this.listId\" role=\"listbox\"\n (onOpening)=\"onToggleOpening($event)\" (onOpened)=\"onToggleOpened()\"\n (onClosing)=\"onToggleClosing($event)\" (onClosed)=\"onToggleClosed()\">\n <ng-container *ngIf=\"!collapsed\">\n <ng-content></ng-content>\n </ng-container>\n</div>\n",
providers: [{ provide: IGX_DROPDOWN_BASE, useExisting: IgxComboDropDownComponent }]
}] }
];
/** @nocollapse */
IgxComboDropDownComponent.ctorParameters = () => [
{ type: ElementRef },
{ type: ChangeDetectorRef },
{ type: IgxSelectionAPIService },
{ type: undefined, decorators: [{ type: Inject, args: [IGX_COMBO_COMPONENT,] }] },
{ type: IgxComboAPIService }
];
IgxComboDropDownComponent.propDecorators = {
children: [{ type: ContentChildren, args: [IgxComboItemComponent, { descendants: true },] }],
verticalScrollContainer: [{ type: ContentChild, args: [forwardRef(() => IgxForOfDirective), { read: IgxForOfDirective },] }]
};
if (false) {
/**
* @type {?}
* @private
*/
IgxComboDropDownComponent.prototype._scrollPosition;
/**
* @hidden
* \@internal
* @type {?}
*/
IgxComboDropDownComponent.prototype.children;
/**
* @hidden \@internal
* @type {?}
*/
IgxComboDropDownComponent.prototype.verticalScrollContainer;
/**
* @type {?}
* @protected
*/
IgxComboDropDownComponent.prototype.scrollHandler;
/**
* @type {?}
* @protected
*/
IgxComboDropDownComponent.prototype.elementRef;
/**
* @type {?}
* @protected
*/
IgxComboDropDownComponent.prototype.cdr;
/**
* @type {?}
* @protected
*/
IgxComboDropDownComponent.prototype.selection;
/** @type {?} */
IgxComboDropDownComponent.prototype.combo;
/**
* @type {?}
* @protected
*/
IgxComboDropDownComponent.prototype.comboAPI;
}
//# 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{\n    ChangeDetectorRef, Component, ContentChild, ElementRef, forwardRef, Inject, QueryList, OnDestroy, AfterViewInit, ContentChildren\n} from '@angular/core';\nimport { takeUntil, take } from 'rxjs/operators';\nimport { IgxForOfDirective } from '../directives/for-of/for_of.directive';\nimport { CancelableBrowserEventArgs } from '../core/utils';\nimport { IgxComboBase, IGX_COMBO_COMPONENT } from './combo.common';\nimport { Navigate } from '../drop-down/drop-down.common';\nimport { IDropDownBase, IGX_DROPDOWN_BASE } from '../drop-down/drop-down.common';\nimport { IgxDropDownComponent } from '../drop-down/drop-down.component';\nimport { DropDownActionKey } from '../drop-down/drop-down.common';\nimport { IgxComboAddItemComponent } from './combo-add-item.component';\nimport { IgxComboAPIService } from './combo.api';\nimport { IgxDropDownItemBase } from '../drop-down/drop-down-item.base';\nimport { IgxSelectionAPIService } from '../core/selection';\nimport { IgxComboItemComponent } from './combo-item.component';\n\n/** @hidden */\n@Component({\n    selector: 'igx-combo-drop-down',\n    templateUrl: '../drop-down/drop-down.component.html',\n    providers: [{ provide: IGX_DROPDOWN_BASE, useExisting: IgxComboDropDownComponent }]\n})\nexport class IgxComboDropDownComponent extends IgxDropDownComponent implements IDropDownBase, OnDestroy, AfterViewInit {\n    constructor(\n        protected elementRef: ElementRef,\n        protected cdr: ChangeDetectorRef,\n        protected selection: IgxSelectionAPIService,\n        @Inject(IGX_COMBO_COMPONENT) public combo: IgxComboBase,\n        protected comboAPI: IgxComboAPIService) {\n        super(elementRef, cdr, selection);\n    }\n\n    protected get scrollContainer() {\n        return this.verticalScrollContainer.dc.location.nativeElement;\n    }\n\n    protected get isScrolledToLast(): boolean {\n        const scrollTop = this.verticalScrollContainer.getVerticalScroll().scrollTop;\n        const scrollHeight = this.verticalScrollContainer.getVerticalScroll().scrollHeight;\n        return Math.floor(scrollTop + this.verticalScrollContainer.igxForContainerSize) === scrollHeight;\n    }\n\n    protected get lastVisibleIndex(): number {\n        return this.combo.totalItemCount ?\n            Math.floor(this.combo.itemsMaxHeight / this.combo.itemHeight) :\n            this.items.length - 1;\n    }\n\n    private _scrollPosition = 0;\n\n    /**\n     * @hidden\n     * @internal\n     */\n    @ContentChildren(IgxComboItemComponent, { descendants: true })\n    public children: QueryList<IgxDropDownItemBase> = null;\n\n    /**\n     * @hidden @internal\n     */\n    @ContentChild(forwardRef(() => IgxForOfDirective), { read: IgxForOfDirective })\n    public verticalScrollContainer: IgxForOfDirective<any>;\n\n    /**\n     * @hidden @internal\n     */\n    public onFocus() {\n        this._focusedItem = this._focusedItem || this.items[0];\n        if (this._focusedItem) {\n            this._focusedItem.focused = true;\n        }\n    }\n\n    /**\n     * @hidden @internal\n     */\n    public onBlur(evt?) {\n        if (this._focusedItem) {\n            this._focusedItem.focused = false;\n            this._focusedItem = null;\n        }\n    }\n\n    /**\n     * @hidden @internal\n     */\n    public onToggleOpened() {\n        this.onOpened.emit();\n    }\n    /**\n     * @hidden\n     */\n    public navigatePrev() {\n        if (this._focusedItem.itemIndex === 0 && this.verticalScrollContainer.state.startIndex === 0) {\n            this.combo.focusSearchInput(false);\n        } else {\n            super.navigatePrev();\n        }\n    }\n\n    /**\n     * @hidden @internal\n     */\n    public navigateFirst() {\n        const vContainer = this.verticalScrollContainer;\n        if (vContainer.state.startIndex === 0) {\n            super.navigateItem(0);\n            return;\n        }\n        vContainer.scrollTo(0);\n        this.subscribeNext(vContainer, () => {\n            this.combo.triggerCheck();\n            super.navigateItem(0);\n            this.combo.triggerCheck();\n        });\n    }\n\n    /**\n     * @hidden @internal\n     */\n    public navigateLast() {\n        const vContainer = this.verticalScrollContainer;\n        const scrollTarget = this.combo.totalItemCount ?\n            this.combo.totalItemCount - 1 :\n            Math.max(this.combo.data.length - 1, vContainer.igxForOf.length - 1);\n        if (vContainer.igxForOf.length <= vContainer.state.startIndex + vContainer.state.chunkSize) {\n            super.navigateItem(this.items.length - 1);\n            return;\n        }\n        vContainer.scrollTo(scrollTarget);\n        this.subscribeNext(vContainer, () => {\n            this.combo.triggerCheck();\n            super.navigateItem(this.items.length - 1);\n            this.combo.triggerCheck();\n        });\n    }\n\n    private navigateRemoteItem(direction: Navigate) {\n        const vContainer = this.verticalScrollContainer;\n        vContainer.addScrollTop(direction * this.combo.itemHeight);\n        this.subscribeNext(vContainer, () => {\n            if (direction === Navigate.Up) {\n                super.navigateItem(0);\n            } else {\n                super.navigateItem(this.focusedItem.itemIndex);\n            }\n        });\n    }\n\n    /**\n     * @hidden @internal\n     */\n    public selectItem(item: IgxDropDownItemBase) {\n        if (item === null || item === undefined) {\n            return;\n        }\n        this.comboAPI.set_selected_item(item.itemID);\n        this._focusedItem = item;\n    }\n\n    private navigateDown(newIndex?: number) {\n        const vContainer = this.verticalScrollContainer;\n        const allData = vContainer.igxForOf;\n        const extraScroll = this.combo.isAddButtonVisible() ? 1 : 0;\n        const focusedItem = this.focusedItem;\n        const items = this.items;\n        const children = this.sortedChildren;\n        if (focusedItem) {\n            if (this.isAddItemFocused()) { return; }\n            if (focusedItem.value === allData[allData.length - 1]) {\n                this.focusAddItemButton();\n                return;\n            }\n        }\n        let targetDataIndex = newIndex === -1 ? this.itemIndexInData(this.focusedItem.itemIndex) + 1 : this.itemIndexInData(newIndex);\n        const lastLoadedIndex = vContainer.state.startIndex + vContainer.state.chunkSize - 1; // Last item is not visible, so require scroll\n        if (targetDataIndex < lastLoadedIndex) { // If no scroll is required\n            if (newIndex !== -1 || newIndex === children.length - 1 - extraScroll) { // Use normal nav for visible items\n                super.navigateItem(newIndex);\n            }\n        } else if (this.isScrolledToLast && targetDataIndex === lastLoadedIndex) { // If already at bottom and target is last item\n            super.navigateItem(items.length - 1 - extraScroll); // Focus the last item (excluding Add Button)\n        } else { // If scroll is required\n            // If item is header, find next non-header index\n            const addedIndex = allData[targetDataIndex].isHeader ? this.findNextFocusableItem(targetDataIndex, Navigate.Down, allData) : 0;\n            targetDataIndex += addedIndex; // Add steps to the target index\n            if (addedIndex === -1) { // If there are no more non-header items & add button is visible\n                this.focusAddItemButton();\n            } else if (targetDataIndex === allData.length - 1 && !this.isScrolledToLast) {\n                // If target is very last loaded item, but scroll is not at the bottom (item is in DOM but not visible)\n                vContainer.scrollTo(targetDataIndex); // This will not trigger `onChunkLoad`\n                super.navigateItem(items.length - 1 - extraScroll); // Target last item (excluding Add Button)\n            } else { // Perform virtual scroll\n                this.subscribeNext(vContainer, () => {\n                    // children = all items in the DD (including addItemButton)\n                    // length - 2 instead of -1, because we do not want to focus the last loaded item (in DOM, but not visible)\n                    // Focus last item (excluding Add Button)\n                    super.navigateItem(!addedIndex ? children[children.length - 1 - extraScroll].itemIndex : this.items.length - 2);\n                });\n                vContainer.scrollTo(targetDataIndex); // Perform virtual scroll\n            }\n        }\n    }\n\n    private navigateUp(newIndex?: number) {\n        const vContainer = this.verticalScrollContainer;\n        const allData = vContainer.igxForOf;\n        const focusedItem = this.focusedItem;\n        if (focusedItem.value === allData.find(e => !e.isHeader && !e.hidden)) { // If this is the very first non-header item\n            this.focusComboSearch(); // Focus combo search\n            return;\n        }\n        let targetDataIndex = newIndex === -1 ? this.itemIndexInData(focusedItem.itemIndex) - 1 : this.itemIndexInData(newIndex);\n        if (newIndex !== -1) { // If no scroll is required\n            if (this.isScrolledToLast && targetDataIndex === vContainer.state.startIndex) {\n                // If virt scrollbar is @ bottom, first item is in DOM but not visible\n                vContainer.scrollTo(targetDataIndex); // This will not trigger `onChunkLoad`\n                super.navigateItem(0); // Focus first visible item\n            } else {\n                super.navigateItem(newIndex); // Use normal navigation\n            }\n        } else { // Perform virtual scroll\n            // If item is header, find next non-header index\n            const addedIndex = allData[targetDataIndex].isHeader ? this.findNextFocusableItem(targetDataIndex, Navigate.Up, allData) : 0;\n            targetDataIndex -= addedIndex; // Add steps to targetDataIndex\n            if (addedIndex === -1) { // If there is no non-header\n                vContainer.scrollTo(0);\n                this.focusComboSearch(); // Focus combo search;\n            } else {\n                this.subscribeNext(vContainer, () => {\n                    super.navigateItem(0); // Focus the first loaded item\n                });\n                vContainer.scrollTo(targetDataIndex); // Perform virtual scroll\n            }\n        }\n    }\n\n    protected navigate(direction: Navigate, currentIndex?: number) {\n        let index = -1;\n        if (this._focusedItem) {\n            index = currentIndex ? currentIndex : this._focusedItem.itemIndex;\n        }\n        const newIndex = this.getNearestSiblingFocusableItemIndex(index, direction);\n        const vContainer = this.verticalScrollContainer;\n        const notVirtual = vContainer.dc.instance.notVirtual;\n        if (notVirtual || !direction) { // If list has no scroll OR no direction is passed\n            super.navigateItem(newIndex); // use default scroll\n        } else if (vContainer && vContainer.totalItemCount && vContainer.totalItemCount !== 0) { // Remote scroll\n            if (newIndex !== -1 &&\n                this.items[newIndex].isVisible(direction)) {\n                this.navigateItem(newIndex);\n            } else {\n                this.navigateRemoteItem(direction);\n            }\n        } else {\n            if (direction === Navigate.Up) { // Navigate UP\n                this.navigateUp(newIndex);\n            } else if (direction === Navigate.Down) {