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Component,
ContentChild,
Input,
OnInit,
TemplateRef
} from '@angular/core';
import { fireEvent } from '../../ngui-utils/src/fire-event';
import { NguiVirtualListComponent } from './ngui-virtual-list.component';
import { NoMatchFound } from './no-match-found';
import { NoneSelect } from './none-select';
import {fromEvent} from 'rxjs';
@Component({
selector: 'ngui-autocomplete',
template: `
<ng-container *ngIf="isReady">
<div class="ngui-autocomplete">
<div #pages></div>
</div>
<ngui-inview (inview)="addMorePages()"></ngui-inview>
</ng-container>
`,
styles: [`
:host {position: absolute; background-color: #fff; max-height: 300px; overflow: auto}
.ngui-autocomplete { border: 1px solid #ccc; padding: 4px }
`]
})
export class NguiAutocompleteComponent extends NguiVirtualListComponent implements OnInit {
@Input() for: string; // input tag id
@Input() minInputChars = 1;
@Input() blankOption = 'Select One';
@Input() noMatchItem = 'No Match Found';
/** Template of NguiInviewPage. Allow users to define their own template */
@ContentChild(TemplateRef) template: TemplateRef<any>;
inputEl: HTMLInputElement;
_focused: any = {input: false, listItem: false};
_focusTimer;
_acTimer;
_selectedFromList: boolean;
_escapedFromList: boolean;
_orgInputValue: string;
_prevInputValue: string;
_lastSelected: any;
/**
* returns autocomplete display condition
* autocompolete list is only visible
* - when input element is focused or list element is focused
* - when input value has enought characters
* - and user just did not selected or escaped
*/
get isReady(): boolean {
const selectedOrEscaped = this._selectedFromList || this._escapedFromList;
const focused = this._focused.input || this._focused.listItem;
const minChars = this.inputEl.value.length >= this.minInputChars;
return (!selectedOrEscaped && focused && minChars);
}
ngOnInit(): void {
this.inputEl = <HTMLInputElement> document.querySelector('#' + this.for); // eslint-disable-line
this.positionThisUnderInputEl();
fromEvent(this.inputEl, 'keyup').subscribe(this.onInputElKeyup.bind(this));
this.inputEl.addEventListener('focus', this.onInputElFocused.bind(this));
this.inputEl.addEventListener('blur', this.onInputElBlurred.bind(this));
this.selected.subscribe(this.onSelected.bind(this));
this.escaped.subscribe(this.onEscaped.bind(this));
}
onSelected(value): void {
this._selectedFromList = true;
this.inputEl.focus();
this._lastSelected = value;
this.cdr.detectChanges(); // for ChangeDetectionStrategy.OnPush
}
onEscaped(): void {
this._escapedFromList = true;
this.inputEl.focus();
if (!this._lastSelected) {
this.inputEl.value = this._orgInputValue;
}
this.cdr.detectChanges(); // for ChangeDetectionStrategy.OnPush
}
onInputElFocused(event): void {
this.isListLoading = false;
if (typeof this._orgInputValue === 'undefined') {
this._orgInputValue = this.inputEl.value;
}
this._prevInputValue = this.inputEl.value;
this.setFocused('input', true);
}
onInputElBlurred(): void {
this.setFocused('input', false);
}
clearList(): void {
this.inviewPages.forEach(compRef => {
compRef.destroy();
});
this.inviewPages = [];
}
onInputElKeyup(event: KeyboardEvent): void {
const firstList = this.element.nativeElement.querySelector('ngui-list-item');
if (event.key === 'Enter' || event.key === 'Escape') {
if (firstList) {
fireEvent(firstList, 'keyup', {key: event.key});
} else {
this.onEscaped();
}
} else if ((event.key === 'ArrowDown' || event.key === 'ArrowRight') && firstList) {
firstList.focus();
} else if (event.key === 'ArrowUp' || event.key === 'ArrowLeft') {
//
} else Iif (this.inputEl.value.length >= this.minInputChars) {
this._selectedFromList = false;
this._escapedFromList = false;
this.addAutocompleteList();
}
}
/** Complete the first page of autocomplete */
addAutocompleteList(): void {
if (this.isReady) {
clearTimeout(this._acTimer);
this._acTimer = setTimeout(() => {
this.isListLoading = false; // ???????/
this._prevInputValue = this.inputEl.value;
this._escapedFromList = false;
this._selectedFromList = false;
this.clearList();
this.addAnInviewPageToPages();
}, 200);
}
}
/** Complete after the first page of autocomplete when it scrolls to the bottom */
addMorePages(): void {
if (this.inviewPages.length) {
this.addAnInviewPageToPages();
}
}
setFocused(elType: 'input' | 'listItem', val: boolean): void {
if (val) {
clearTimeout(this._focusTimer);
this._focused = {input: false, listItem: false};
this._focused[elType] = true;
} else {
this._focusTimer = setTimeout(() => {
this._focused[elType] = false;
this.cdr.detectChanges(); // for ChangeDetectionStrategy.OnPush
}, 100);
}
}
positionThisUnderInputEl(): void {
const thisEl = this.element.nativeElement;
const thisInputElBCR = this.inputEl.getBoundingClientRect();
const top = thisInputElBCR.top + thisInputElBCR.height + window.scrollY;
this.renderer.setStyle(thisEl, 'left', `${thisInputElBCR.left}px`);
this.renderer.setStyle(thisEl, 'top', `${top}px`);
this.renderer.setStyle(thisEl, 'minWidth', `${thisInputElBCR.width}px`);
}
// set items of NguiInviewPageComponent
addList(items: Array<any>): void {
this.isListLoading = false;
// TODO: ........ for 1st page only, show no match found or blank option
let noMatchItem: any;
let blankItem: any = {};
if (this.inviewPages.length === 1) {
Iif (this.noMatchItem && (!items || items.length === 0)) { // add no match item
noMatchItem = new NoMatchFound();
blankItem.html = this.noMatchItem;
} else if (this.blankOption) {
blankItem = new NoneSelect();
blankItem.html = this.blankOption;
}
}
const allItems = [].concat(noMatchItem, blankItem, items).filter(x => x);
this.inviewPage.instance.setItems(allItems);
this.cdr.detectChanges();
}
}
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