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| import {
customElement,
bindable,
computedFrom,
ViewResources,
ViewCompiler,
DOM,
processContent,
ElementEvents,
inject,
PLATFORM,
InternalCollectionObserver,
ObserverLocator,
TaskQueue,
} from 'aurelia-framework';
import { getLogger } from 'aurelia-logging';
import { StyleEngine, UxComponent } from '@aurelia-ux/core';
import { UxSelectTheme } from './ux-select-theme';
import { UxOptGroupElement } from './ux-optgroup';
import { UxOptionElement } from './ux-option';
import { getAuViewModel, bool } from './util';
declare module './ux-option' {
interface UxOption {
uxSelect: UxSelect;
}
}
declare module './ux-optgroup' {
interface UxOptGroup {
uxSelect: UxSelect;
}
}
const UP = 38;
// const RIGHT = 39;
const DOWN = 40;
// const LEFT = 37;
// const ESC = 27;
const ENTER = 13;
const SPACE = 32;
const logger = getLogger('ux-select');
const invalidMultipleValueMsg = 'Only null or Array instances can be bound to a multi-select';
const selectArrayContext = 'context:ux-select';
export interface UxSelectElement<T = any> extends HTMLElement {
matcher(a: any, b: any): boolean;
value: T;
}
export interface UxOptionContainer extends HTMLElement {
children: HTMLCollectionOf<UxOptGroupElement | UxOptionElement>;
}
@inject(Element, StyleEngine, ObserverLocator, TaskQueue)
@processContent(ensureUxOptionOrUxOptGroup)
@customElement('ux-select')
export class UxSelect implements UxComponent {
private selectedOption: UxOptionElement | null = null;
// Temporarily used to store <ux-option/> reference in interaction
private focusedUxOption: UxOptionElement | null;
// Observe window events
private winEvents: ElementEvents;
@bindable()
public theme: UxSelectTheme;
@bindable()
public autofocus: boolean | string;
@bindable({ defaultValue: false })
public disabled: boolean | string;
@bindable({ defaultValue: false })
public multiple: boolean | string;
@bindable()
public placeholder: string;
public value: any;
public displayValue: string;
public expanded: boolean;
// Populated by Aurelia
public readonly optionWrapperEl: HTMLElement;
public readonly optionCtEl: UxOptionContainer;
constructor(
public readonly element: UxSelectElement,
private styleEngine: StyleEngine,
private observerLocator: ObserverLocator,
private taskQueue: TaskQueue
) {
// Only chrome persist the element prototype when cloning with clone node
Object.setPrototypeOf(element, UxSelectElementProto);
}
public bind() {
if (bool(this.autofocus)) {
// setTimeout(focusEl, 0, this.button);
}
if (this.isMultiple) {
if (!this.value) {
this.value = [];
} else if (!Array.isArray(this.value)) {
throw new Error(invalidMultipleValueMsg);
}
}
if (!this.winEvents) {
this.winEvents = new ElementEvents(window as any);
}
// Initially Synchronize options with value of this element
this.taskQueue.queueMicroTask(this);
}
public attached() {
this.resolveDisplayValue();
}
public unbind() {
this.winEvents.disposeAll();
if (this.arrayObserver) {
this.arrayObserver.unsubscribe(selectArrayContext, this);
this.arrayObserver = null;
}
this.selectedOption = null;
}
private resolveDisplayValue() {
const values = this.options
.filter(option =>
Array.isArray(this.value) ?
this.value.some(value => value === option.value) :
option.value === this.value)
.map(t => t.innerText);
this.displayValue = values.join(', ');
if (this.displayValue.length > 0) {
this.element.classList.add('ux-select--has-value');
} else {
this.element.classList.remove('ux-select--has-value');
}
}
private ignoreSelectEvent: boolean = true;
private synchronizeOptions() {
const value = this.value;
const isArray = Array.isArray(value);
const options = this.options;
const matcher = this.element.matcher || defaultMatcher;
let i = options.length;
this.ignoreSelectEvent = true;
while (i--) {
const option = options[i];
const optionValue = option.value;
if (isArray) {
option.selected = value.findIndex((item: any) => !!matcher(optionValue, item)) !== -1;
continue;
}
option.selected = !!matcher(optionValue, value);
}
this.ignoreSelectEvent = false;
}
private synchronizeValue() {
const options = this.options;
const ii = options.length;
let count = 0;
let optionValues: any[] | null = [];
// extract value from ux-option
for (let i = 0; i < ii; i++) {
const option = options[i];
if (!option.selected) {
continue;
}
optionValues.push(option.value);
count++;
}
if (this.isMultiple) {
// multi-select
if (Array.isArray(this.value)) {
const selectValues = this.value;
const matcher = this.element.matcher || defaultMatcher;
// remove items that are no longer selected.
let i = 0;
while (i < selectValues.length) {
const a = selectValues[i];
if (optionValues.findIndex(b => matcher(a, b)) === -1) {
selectValues.splice(i, 1);
} else {
i++;
}
}
// add items that have been selected.
i = 0;
while (i < optionValues.length) {
const a = optionValues[i];
if (selectValues.findIndex(b => matcher(a, b)) === -1) {
selectValues.push(a);
}
i++;
}
this.resolveDisplayValue();
return; // don't notify.
}
} else {
// single-select
// tslint:disable-next-line:prefer-conditional-expression
if (count === 0) {
optionValues = null;
} else {
optionValues = optionValues[0];
}
this.setValue(optionValues);
}
}
private setupListAnchor() {
this.calcAnchorPosition();
this.winEvents.subscribe('wheel', (e: WheelEvent) => {
if (this.expanded) {
if (e.target === PLATFORM.global || !this.optionWrapperEl.contains(e.target as HTMLElement)) {
this.collapse();
}
}
}, true);
}
private unsetupListAnchor() {
this.listAnchor = null;
this.winEvents.disposeAll();
}
public listAnchor: { x: number | string, y: number | string } | null;
private calcAnchorPosition() {
const elDim = this.element.getBoundingClientRect();
const offsetY = (48 - elDim.height) / 2;
this.listAnchor = { x: elDim.left, y: elDim.top - offsetY };
}
private onKeyboardSelect() {
if (!this.expanded) {
return;
}
const focusedOption = this.focusedUxOption;
if (this.isMultiple) {
if (!focusedOption) {
return;
}
focusedOption.selected = !focusedOption.selected;
} else {
this.collapse();
}
}
public call() {
this.synchronizeOptions();
}
public getValue() {
return this.value;
}
private arrayObserver: InternalCollectionObserver | null;
public setValue(newValue: any) {
if (newValue !== null && newValue !== undefined && this.isMultiple && !Array.isArray(newValue)) {
throw new Error('Only null, undenfined or Array instances can be bound to a multi-select.');
}
if (this.value === newValue) {
return;
}
// unsubscribe from old array.
if (this.arrayObserver) {
this.arrayObserver.unsubscribe(selectArrayContext, this);
this.arrayObserver = null;
}
if (this.isMultiple) {
// subscribe to new array.
if (Array.isArray(newValue)) {
this.arrayObserver = this.observerLocator.getArrayObserver(newValue);
this.arrayObserver.subscribe(selectArrayContext, this);
}
}
if (newValue !== this.value) {
this.value = newValue;
this.resolveDisplayValue();
this.element.dispatchEvent(DOM.createCustomEvent('change', { bubbles: true }));
}
}
private isExpanding: boolean;
public expand() {
if (this.expanded) {
return;
}
if (this.isExpanding) {
return;
}
this.isExpanding = true;
this.optionWrapperEl.classList.add('ux-select__list-wrapper--open');
setTimeout(() => {
this.optionCtEl.classList.add('ux-select__list-container--open');
this.isExpanding = false;
this.expanded = true;
this.setFocusedOption(this.selectedOption);
}, 0);
this.setupListAnchor();
}
private isCollapsing: boolean;
public collapse() {
if (this.isCollapsing) {
return;
}
this.isCollapsing = true;
this.optionCtEl.classList.remove('ux-select__list-container--open');
setTimeout(() => {
this.optionWrapperEl.classList.remove('ux-select__list-wrapper--open');
this.isCollapsing = false;
this.expanded = false;
this.setFocusedOption(null);
this.unsetupListAnchor();
}, this.theme && this.theme.listTransition || 125);
}
private setFocusedOption(focusedOption: UxOptionElement | null) {
const oldFocusedOption = this.focusedUxOption;
if (focusedOption !== oldFocusedOption) {
if (oldFocusedOption) {
oldFocusedOption.focused = false;
}
if (focusedOption) {
focusedOption.focused = true;
focusedOption.scrollIntoView({ block: 'nearest', inline: 'nearest' });
}
this.focusedUxOption = focusedOption;
}
}
public moveSelectedIndex(offset: number) {
let currentIndex: number = 0;
const options = this.options;
if (this.focusedUxOption) {
currentIndex = options.indexOf(this.focusedUxOption);
} else if (this.selectedOption) {
currentIndex = options.indexOf(this.selectedOption);
}
let nextIndex = currentIndex + offset;
if (nextIndex > options.length - 1) {
nextIndex = options.length - 1;
}
if (nextIndex < 0) {
nextIndex = 0;
}
const focusedOption = options[nextIndex];
if (focusedOption.disabled) {
if (offset > 0) {
if (nextIndex === options.length - 1) {
return;
}
this.moveSelectedIndex(offset + 1);
} else {
if (nextIndex < 0) {
return;
}
this.moveSelectedIndex(offset - 1);
}
return;
}
this.setFocusedOption(focusedOption);
focusedOption.focused = true;
if (this.isMultiple) {
// empty
} else {
this.ignoreSelectEvent = true;
if (this.selectedOption) {
this.selectedOption.selected = false;
}
this.selectedOption = focusedOption;
this.selectedOption.selected = true;
this.ignoreSelectEvent = false;
this.setValue(this.selectedOption.value);
}
}
public onTriggerClick() {
if (!this.isDisabled) {
if (this.expanded) {
return;
}
this.expand();
}
}
public onBlur() {
if (!this.element.contains(DOM.activeElement)) {
this.collapse();
}
}
public onSelect(e: CustomEvent) {
e.stopPropagation();
if (this.ignoreSelectEvent) {
return;
}
const newSelection: UxOptionElement = e.detail;
const lastSelection = this.selectedOption;
if (this.isMultiple) {
this.synchronizeValue();
} else {
this.ignoreSelectEvent = true;
if (lastSelection) {
lastSelection.selected = false;
}
this.ignoreSelectEvent = false;
this.selectedOption = newSelection;
this.setValue(newSelection.value);
if (this.expanded) {
this.collapse();
}
}
}
public onKeyDown(event: KeyboardEvent) {
if (this.isDisabled) {
return;
}
// tslint:disable-next-line:switch-default
switch (event.which) {
case UP: case DOWN:
this.moveSelectedIndex(event.which === UP ? -1 : 1);
event.preventDefault();
break;
case ENTER: case SPACE:
this.onKeyboardSelect();
event.preventDefault();
break;
}
return true;
}
public themeChanged(newValue: UxSelectTheme) {
if (newValue && !newValue.themeKey) {
newValue.themeKey = 'ux-select';
}
this.styleEngine.applyTheme(newValue, this.element);
}
public multipleChanged(newValue: boolean | string, oldValue: boolean | string) {
newValue = bool(newValue);
oldValue = bool(oldValue);
const hasChanged = newValue !== oldValue;
if (hasChanged) {
this.ignoreSelectEvent = true;
for (const opt of this.options) {
opt.selected = false;
}
this.ignoreSelectEvent = false;
this.selectedOption = null;
this.setValue(newValue
? [] // Changing from single to multiple = reset value to empty array
: null // Changing from multiple to single = reset value to null
);
}
}
public get options(): UxOptionElement[] {
if (!this.optionCtEl) {
return [];
}
const result: UxOptionElement[] = [];
const children = this.optionCtEl.children;
const ii = children.length;
for (let i = 0; ii > i; ++i) {
const element = children[i];
if (element.nodeName === 'UX-OPTION') {
result.push(element);
} else if (element.nodeName === 'UX-OPTGROUP') {
const groupOptions = element.options;
const jj = groupOptions.length;
for (let j = 0; jj > j; ++j) {
result.push(groupOptions[j]);
}
}
}
return result;
}
public getOptions() {
return this.options;
}
@computedFrom('multiple')
public get isMultiple() {
return bool(this.multiple);
}
@computedFrom('disabled')
public get isDisabled() {
return bool(this.disabled);
}
}
/**
* A View-compiler hook that will remove any element that is not `<ux-option>` or `<ux-optgroup/>`
* as child of this `<ux-select/>` element
*/
function ensureUxOptionOrUxOptGroup(
_: ViewCompiler,
__: ViewResources,
node: HTMLElement
) {
if (node.hasAttribute('containerless')) {
logger.warn('Cannot use containerless on <ux-select/>. Consider using as-element instead.');
node.removeAttribute('containerless');
}
let currentChild: any = node.firstChild;
while (currentChild) {
const nextSibling = currentChild.nextSibling;
if (currentChild.nodeName === 'UX-OPTION' || currentChild.nodeName === 'UX-OPTGROUP') {
currentChild = nextSibling;
continue;
}
node.removeChild(currentChild);
currentChild = nextSibling;
}
return true;
}
const UxSelectElementProto = Object.create(HTMLElement.prototype, {
value: {
get() {
return getAuViewModel<UxSelect>(this).getValue();
},
set(v: any) {
return getAuViewModel<UxSelect>(this).setValue(v);
}
},
options: {
get() {
return getAuViewModel<UxSelect>(this).getOptions();
}
}
});
function defaultMatcher<T = any>(a: T, b: T) {
return a === b;
}
|