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eqwad-combo-box.component.ts
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eqwad-combo-box.component.ts
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import { Component, Input, Output, ViewChild, Renderer, OnDestroy, EventEmitter, OnChanges, SimpleChanges } from 'angular2/core';
import { EqwadComboBoxFilter } from './eqwad-combo-box-filter.pipe';
@Component({
selector: 'eq-combo-box',
pipes: [EqwadComboBoxFilter],
template: `
<div class="eq-combo-box" #comboBoxElement
tabindex="{{isEnabled ? '0' : '-1'}}"
[ngClass]="{
'eq-combo-box_is-opened': _isOpened,
'eq-combo-box_is-focused': _isFocused && isEnabled,
'eq-combo-box_is-enabled': isEnabled,
'eq-combo-box_has-items': _hasItems
}"
(keydown)="_keydown($event)"
(mouseenter)="_mouseenter()"
(mouseleave)="_mouseleave()">
<div class="eq-combo-box__wrapper">
<input class="eq-combo-box__text" #textElement
type="text"
autocomplete="off"
[ngModel]="_text"
(ngModelChange)="_textChange($event)"
(focus)="_textFocus()"
(blur)="_textBlur()"
[placeholder]="placeholder"
[readonly]="!isEnabled"/>
<div class="eq-combo-box__open"
(click)="_open()">
<i class="fa fa-caret-down"></i>
</div>
</div>
</div>
<div class="eq-combo-box-list" #listElement
[ngClass]="{
'eq-combo-box-list_is-opened': _isOpened,
'eq-combo-box-list_is-focused': _isFocused,
'eq-combo-box-list_has-items': _hasItems
}"
(mouseenter)="_mouseenter()"
(mouseleave)="_mouseleave()">
<div class="eq-combo-box-list__item"
*ngFor="let item of (items | eqwadComboBoxFilter:itemTextField:_text:value:_isTyping); let i = index"
[ngClass]="{
'eq-combo-box-list__item_is-selected': _isItemSelected(i),
'eq-combo-box-list__item_is-highlighted': _isItemHighlighted(i)
}"
(click)="_select(i, $event)">
{{item[itemTextField]}}
</div>
</div>
`
})
export class EqwadComboBox implements OnDestroy, OnChanges {
@Input() itemValueField: string;
@Input() itemTextField: string;
@Input() items: Array<Object> = [];
@Input() placeholder: string = '';
@Input() value: Object = null;
@Input() isEnabled: boolean = true;
@Output() onSelect: EventEmitter<any> = new EventEmitter();
@Output() onOpen: EventEmitter<any> = new EventEmitter();
@Output() onClose: EventEmitter<any> = new EventEmitter();
@ViewChild('comboBoxElement') private comboBoxElement: any;
@ViewChild('listElement') private listElement: any;
@ViewChild('textElement') private textElement: any;
private _text = '';
private _isOpened = false;
private _isFocused = false;
private _isHovered = false;
private _isTyping = false;
private _documentClickListener: Function;
private _hasItems: boolean;
private _keyCode = {
down: 40,
escape: 27,
tab: 9,
up: 38
};
private _highlightedItemIndex = -1;
private _selectedItemIndex = -1;
private _isViewInitialized = false;
constructor(renderer: Renderer) {
this._documentClickListener = renderer.listenGlobal('document', 'click', (event: any) => {
// Close list if user clicks outside.
if (!this._isHovered && this._isOpened) {
this._close();
}
if (!this._isHovered && this._isFocused) {
this._isFocused = false;
}
});
}
ngOnChanges(changes: SimpleChanges) {
if (changes.value) {
this._setValue(changes.value.currentValue);
}
}
ngAfterViewInit() {
this._isViewInitialized = true;
this._setValue(this.value);
}
ngOnDestroy() {
// Remove listeners.
this._documentClickListener();
}
open() {
if (!this.isEnabled) {
return;
}
this._checkItems();
this._positionList();
this._isOpened = true;
}
close() {
this._isOpened = false;
}
private _setValue(value: Object) {
if (!this._isViewInitialized) {
return;
}
if (value) {
let selectedItemIndex = -1,
selectedItem: Object = null;
for (let i = 0; i < this.items.length; i++) {
if (this.items[i][this.itemValueField] === value[this.itemValueField]) {
selectedItemIndex = i;
selectedItem = this.items[i];
break;
}
}
this._selectedItemIndex = selectedItemIndex;
this.textElement.nativeElement.value = selectedItem[this.itemTextField];
} else {
this.textElement.nativeElement.value = '';
}
}
private _open() {
if (!this.isEnabled) {
return;
}
this._checkItems();
this._isOpened = !this._isOpened;
if (this._isOpened) {
this._positionList();
this._isFocused = true;
this.onOpen.emit(null);
} else {
this.onClose.emit(null);
}
}
private _close() {
if (!this._isOpened) {
return;
}
this._highlightedItemIndex = -1;
this._isOpened = false;
this.onClose.emit(null);
}
private _mouseenter() {
this._isHovered = true;
}
private _mouseleave() {
this._isHovered = false;
}
private _select(itemIndex: number, event?: any) {
let item = this.items[itemIndex];
this._selectedItemIndex = itemIndex;
this.textElement.nativeElement.value = item[this.itemTextField];
// No item was previously selected.
if (!this.value) {
this.onSelect.emit(item);
}
// A different item has been selected.
if (this.value && this.value[this.itemValueField] !== item[this.itemValueField]) {
this.onSelect.emit(item);
}
this.value = item;
this._close();
this._isTyping = false;
}
private _positionList() {
this.listElement.nativeElement.style.width = this.comboBoxElement.nativeElement.offsetWidth + 'px';
this.listElement.nativeElement.style.left = this.comboBoxElement.nativeElement.offsetLeft + 'px';
}
private _textChange(text: string) {
this._isTyping = true;
this._text = text;
this._checkItems();
if (!this._isOpened) {
this.open();
}
}
private _textFocus() {
this._isFocused = true;
}
private _textBlur() {
let text = this.textElement.nativeElement.value;
this._isTyping = false;
this._close();
if (!text) {
return;
}
text = text.toLowerCase();
// Text has not changed.
if (this.value && this.value[this.itemTextField].toLowerCase() === text) {
return;
}
let item = {};
item[this.itemValueField] = '';
item[this.itemTextField] = this.textElement.nativeElement.value;
let items = this.items.filter(item => {
let itemText = item[this.itemTextField];
return itemText && itemText.toLowerCase() === text;
});
if (items.length === 0) {
// Create a new item if item with the same text does not exist.
this.value = item;
this.onSelect.emit(item);
} else {
// Use an existing item.
let existingItem = items[0];
if (existingItem[this.itemValueField] !== this.value[this.itemValueField]) {
this.value = existingItem;
this.onSelect.emit(existingItem);
}
}
}
private _checkItems() {
this._hasItems = new EqwadComboBoxFilter()
.transform(this.items, this.itemTextField, this._text, this.value, this._isTyping)
.length > 0;
}
private _isItemSelected(itemIndex: number) {
return itemIndex === this._selectedItemIndex;
}
private _isItemHighlighted(itemIndex: number) {
return itemIndex === this._highlightedItemIndex;
}
private _keydown(event: any) {
// Down key.
if (event.which === this._keyCode.down) {
if (!this._isOpened) {
this.open();
return;
}
if (this._highlightedItemIndex === -1) {
this._highlightedItemIndex = 0;
} else {
if (this._highlightedItemIndex < this.items.length - 1) {
this._highlightedItemIndex++;
}
}
}
// Up key.
if (event.which === this._keyCode.up) {
if (!this._isOpened) {
return;
}
if (this._highlightedItemIndex > 0) {
this._highlightedItemIndex--;
}
}
// Tab key.
if (event.which === this._keyCode.tab) {
if (this._highlightedItemIndex === -1) {
return;
}
this._select(this._highlightedItemIndex, null);
this.comboBoxElement.nativeElement.focus();
this._isFocused = true;
}
// Esc key.
if (event.which === this._keyCode.escape) {
if (this._isOpened) {
this._close();
}
}
}
}