484 lines
12 KiB
JavaScript
484 lines
12 KiB
JavaScript
import './style.scss';
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import ngModule from '../../module';
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import Popover from '../popover';
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import ArrayModel from '../array-model/array-model';
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import CrudModel from '../crud-model/crud-model';
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import {mergeWhere} from 'vn-loopback/util/filter';
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import focus from '../../lib/focus';
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/**
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* @event select Thrown when model item is selected
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* @event change Thrown when model data is ready
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*/
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export default class DropDown extends Popover {
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constructor($element, $, $transclude) {
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super($element, $, $transclude);
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this.valueField = 'id';
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this.showField = 'name';
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this._search = undefined;
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this._activeOption = -1;
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this.showLoadMore = true;
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this.showFilter = true;
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this.searchDelay = 300;
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}
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get search() {
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return this._search;
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}
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set search(value) {
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function nullify(value) {
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return value == '' || value == undefined ? null : value;
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}
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let oldValue = nullify(this._search);
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this._search = value;
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if (!this.shown) return;
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value = nullify(value);
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if (value === oldValue && this.modelData != null) return;
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if (value != null)
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this._activeOption = 0;
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this.$timeout.cancel(this.searchTimeout);
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if (this.model) {
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this.model.clear();
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if (this.model instanceof CrudModel) {
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this.searchTimeout = this.$timeout(() => {
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this.refreshModel();
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this.searchTimeout = null;
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}, value != null ? this.searchDelay : 0);
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} else
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this.refreshModel();
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}
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this.buildList();
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}
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get statusText() {
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let model = this.model;
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let data = this.modelData;
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if (!model)
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return 'No data';
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if (model.isLoading || this.searchTimeout)
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return 'Loading...';
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if (data == null)
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return 'No data';
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if (model.moreRows)
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return 'Load More';
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if (data.length === 0)
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return 'No results found';
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return null;
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}
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get activeOption() {
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return this._activeOption;
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}
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/**
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* Shows the drop-down. If a parent is specified it is shown in a visible
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* relative position to it.
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*
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* @param {HTMLElement} parent The parent element to show drop down relative to
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* @param {String} search The initial search term or %null
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*/
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show(parent, search) {
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if (this.shown) return;
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super.show(parent);
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this._activeOption = -1;
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this.list = this.popup.querySelector('.list');
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this.ul = this.popup.querySelector('ul');
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this.docKeyDownHandler = e => this.onDocKeyDown(e);
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this.document.addEventListener('keydown', this.docKeyDownHandler);
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this.listScrollHandler = e => this.onScroll(e);
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this.list.addEventListener('scroll', this.listScrollHandler);
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this.list.scrollTop = 0;
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this.search = search;
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this.buildList();
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focus(this.popup.querySelector('input'));
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}
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hide() {
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if (!this.shown) return;
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super.hide();
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this.document.removeEventListener('keydown', this.docKeyDownHandler);
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this.docKeyDownHandler = null;
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this.list.removeEventListener('scroll', this.listScrollHandler);
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this.listScrollHandler = null;
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}
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onClose() {
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this.destroyList();
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this.list = null;
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this.ul = null;
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super.onClose();
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}
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/**
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* Activates an option and scrolls the drop-down to that option.
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*
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* @param {Number} option The option index
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*/
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moveToOption(option) {
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this.activateOption(option);
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let list = this.list;
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let li = this.activeLi;
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if (!li) return;
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let liRect = li.getBoundingClientRect();
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let listRect = list.getBoundingClientRect();
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if (liRect.bottom > listRect.bottom)
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list.scrollTop += liRect.bottom - listRect.bottom;
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else if (liRect.top < listRect.top)
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list.scrollTop -= listRect.top - liRect.top;
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}
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/**
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* Activates an option.
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*
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* @param {Number} option The option index
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*/
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activateOption(option) {
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this._activeOption = option;
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if (this.activeLi)
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this.activeLi.className = '';
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let data = this.modelData;
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if (option >= 0 && data && option < data.length) {
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this.activeLi = this.ul.children[option];
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this.activeLi.className = 'active';
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}
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}
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/**
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* Selects an option.
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*
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* @param {Number} option The option index
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*/
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selectOption(option) {
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let data = this.modelData;
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let item = option != -1 && data ? data[option] : null;
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if (item) {
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let value = item[this.valueField];
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if (this.multiple) {
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if (!Array.isArray(this.selection)) {
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this.selection = [];
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this.field = [];
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}
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this.selection.push(item);
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this.field.push(value);
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} else {
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this.selection = item;
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this.field = value;
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}
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this.emit('select', {item});
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}
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if (!this.multiple)
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this.hide();
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}
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onClearClick() {
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this.search = null;
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}
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onScroll() {
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let list = this.list;
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let shouldLoad =
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list.scrollTop + list.clientHeight >= (list.scrollHeight - 40)
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&& !this.model.isLoading;
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if (shouldLoad)
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this.model.loadMore();
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}
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onLoadMoreClick(event) {
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if (event.defaultPrevented) return;
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this.model.loadMore();
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}
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onContainerClick(event) {
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if (event.defaultPrevented) return;
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let index = getPosition(this.ul, event);
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if (index != -1) this.selectOption(index);
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}
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onDocKeyDown(event) {
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if (event.defaultPrevented) return;
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let data = this.modelData;
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let option = this.activeOption;
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let nOpts = data ? data.length - 1 : 0;
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switch (event.key) {
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case 'Tab':
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this.selectOption(option);
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return;
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case 'Enter':
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this.selectOption(option);
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break;
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case 'ArrowUp':
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this.moveToOption(option <= 0 ? nOpts : option - 1);
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break;
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case 'ArrowDown':
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this.moveToOption(option >= nOpts ? 0 : option + 1);
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break;
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case 'End':
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this.moveToOption(nOpts);
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break;
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case 'Home':
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this.moveToOption(0);
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break;
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default:
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return;
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}
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event.preventDefault();
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this.$.$applyAsync();
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}
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buildList() {
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if (!this.shown) return;
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this.destroyList();
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let hasTemplate = this.$transclude && this.$transclude.isSlotFilled('tplItem');
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let fragment = this.document.createDocumentFragment();
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let data = this.modelData;
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if (data) {
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for (let i = 0; i < data.length; i++) {
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let option = data[i];
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option.orgShowField = option[this.showField];
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if (this.translateFields) {
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option = Object.assign({}, option);
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for (let field of this.translateFields)
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option[field] = this.$translate.instant(option[field]);
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}
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let li = this.document.createElement('li');
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li.setAttribute('name', option.orgShowField);
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fragment.appendChild(li);
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if (this.multiple) {
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let check = this.document.createElement('input');
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check.type = 'checkbox';
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li.appendChild(check);
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if (this.field && this.field.indexOf(option[this.valueField]) != -1)
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check.checked = true;
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}
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if (hasTemplate) {
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this.$transclude((clone, scope) => {
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Object.assign(scope, option);
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li.appendChild(clone[0]);
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this.scopes[i] = scope;
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}, null, 'tplItem');
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} else {
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let text = this.document.createTextNode(option[this.showField]);
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li.appendChild(text);
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}
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}
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}
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this.ul.appendChild(fragment);
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this.activateOption(this._activeOption);
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this.$.$applyAsync(() => this.relocate());
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}
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destroyList() {
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if (this.ul)
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this.ul.innerHTML = '';
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if (this.scopes) {
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for (let scope of this.scopes)
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scope.$destroy();
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}
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this.scopes = [];
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}
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getFields() {
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let fields = [];
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fields.push(this.valueField);
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fields.push(this.showField);
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if (this.fields) {
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for (let field of this.fields)
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fields.push(field);
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}
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return fields;
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}
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// Model related code
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onDataChange() {
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if (this.model.orgData)
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this.emit('dataReady');
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this.buildList();
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}
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get modelData() {
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return this._model ? this._model.data : null;
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}
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get model() {
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return this._model;
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}
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set model(value) {
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this.linkEvents({_model: value}, {dataChange: this.onDataChange});
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this.onDataChange();
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this.search = this.search;
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}
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get url() {
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return this._url;
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}
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set url(value) {
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this._url = value;
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if (value) {
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let model = new CrudModel(this.$q, this.$http);
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model.url = value;
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this.initModel(model);
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}
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}
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get data() {
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return this._data;
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}
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set data(value) {
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this._data = value;
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if (value) {
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let model = new ArrayModel(this.$q, this.$filter);
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model.orgData = value;
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this.initModel(model);
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}
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}
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initModel(model) {
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model.autoLoad = false;
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model.$onInit();
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this.model = model;
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}
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refreshModel() {
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let model = this.model;
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let order;
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if (this.order)
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order = this.order;
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else if (this.showField)
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order = `${this.showField} ASC`;
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let filter = {
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order,
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limit: this.limit || 30
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};
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if (model instanceof CrudModel) {
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let searchExpr = this._search == null
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? null
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: this.searchFunction({$search: this._search});
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Object.assign(filter, {
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fields: this.getFields(),
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include: this.include,
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where: mergeWhere(this.where, searchExpr)
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});
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} else if (model instanceof ArrayModel) {
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if (this._search != null)
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filter.where = this.searchFunction({$search: this._search});
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}
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return this.model.applyFilter(filter);
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}
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searchFunction(scope) {
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if (this.model instanceof CrudModel)
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return {[this.showField]: {like: `%${scope.$search}%`}};
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if (this.model instanceof ArrayModel)
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return {[this.showField]: scope.$search};
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}
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}
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/**
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* Gets the position of an event element relative to a parent.
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*
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* @param {HTMLElement} parent The parent element
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* @param {Event} event The event object
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* @return {Number} The element index
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*/
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function getPosition(parent, event) {
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let target = event.target;
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let children = parent.children;
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if (target === parent)
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return -1;
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while (target.parentNode !== parent)
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target = target.parentNode;
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for (let i = 0; i < children.length; i++) {
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if (children[i] === target)
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return i;
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}
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return -1;
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}
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ngModule.vnComponent('vnDropDown', {
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slotTemplate: require('./index.html'),
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controller: DropDown,
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transclude: {
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tplItem: '?tplItem'
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},
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bindings: {
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field: '=?',
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selection: '=?',
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search: '<?',
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showFilter: '<?',
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parent: '<?',
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multiple: '<?',
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onSelect: '&?',
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translateFields: '<?',
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data: '<?',
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url: '@?',
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fields: '<?',
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include: '<?',
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where: '<?',
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order: '@?',
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limit: '<?',
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searchFunction: '&?',
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searchDelay: '<?'
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}
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});
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