add dropdown component
This commit is contained in:
466
lib/ui/dropdown.js
Normal file
466
lib/ui/dropdown.js
Normal file
@ -0,0 +1,466 @@
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// import { r, global, contains, isPositive, nullOrEmpty } from "../utility";
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import { r } from "../utility/lgres";
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import { contains, nullOrEmpty } from "../utility/strings";
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import { global, isPositive } from "../utility";
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import { createCheckbox } from "./checkbox";
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import { createIcon } from "./icon"
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const SymbolDropdown = Symbol.for('ui-dropdown');
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const DropdownTitleHeight = 26;
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const DropdownItemHeight = 30;
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let dropdownGlobal = global[SymbolDropdown];
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if (dropdownGlobal == null) {
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// init
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dropdownGlobal = {};
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Object.defineProperty(dropdownGlobal, 'clear', {
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writable: false,
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configurable: false,
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enumerable: false,
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value: function () {
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const panel = document.querySelector('.dropdown-wrapper .dropdown-panel.active');
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if (panel == null) {
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return;
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}
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panel.classList.remove('active');
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const dropId = panel.parentElement.dataset.dropId;
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if (dropId == null) {
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return;
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}
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const dropdown = this[dropId];
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if (dropdown != null && dropdown.multiselect && typeof dropdown.oncollapsed === 'function') {
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dropdown.oncollapsed();
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}
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}
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})
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global[SymbolDropdown] = dropdownGlobal;
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document.addEventListener('mousedown', e => {
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let parent = e.target;
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while (parent != null) {
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if (parent.classList.contains('dropdown-panel')) {
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e.stopPropagation();
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return;
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}
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parent = parent.parentElement;
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}
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dropdownGlobal.clear();
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});
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}
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class Dropdown {
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#options;
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#wrapper;
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#container;
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#label;
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#allChecked;
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#source;
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#lastSelected;
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#selected;
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#selectedList;
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sourceFilter;
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onselectedlist;
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onselected;
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onexpanded;
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constructor(options) {
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options ??= {};
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options.searchplaceholder ??= r('searchHolder', 'Search...');
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options.textkey ??= 'text';
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options.valuekey ??= 'value';
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options.htmlkey ??= 'html';
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options.maxlength ??= 500;
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this.#options = options;
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}
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create() {
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const options = this.#options;
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// wrapper
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const wrapper = document.createElement('div');
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const dropId = String(Math.random()).substring(2);
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wrapper.dataset.dropId = dropId;
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wrapper.className = 'dropdown-wrapper';
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dropdownGlobal[dropId] = this;
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this.#wrapper = wrapper;
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// header
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const header = document.createElement('div');
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header.className = 'dropdown-header';
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header.addEventListener('click', () => {
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if (this.disabled) {
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return;
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}
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const active = this.#expanded;
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if (active && this.#label.hasFocus()) {
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return;
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}
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this.#dropdown(!active);
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if (!active && typeof this.onexpanded === 'function') {
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setTimeout(() => this.onexpanded(), 120);
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}
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});
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// label or input
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let label;
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let searchkeys = options.searchkeys;
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if (!Array.isArray(searchkeys) || searchkeys.length === 0) {
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searchkeys = [options.textkey];
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}
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if (options.input) {
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label = document.createElement('input');
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label.className = 'dropdown-text';
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label.setAttribute('type', 'text');
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isPositive(options.maxlength) && label.setAttribute('maxlength', options.maxlength);
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isPositive(options.tabindex) && label.setAttribute('tabindex', options.tabindex);
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label.addEventListener('input', e => {
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const key = e.target.value.toLowerCase();
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let source = this.source;
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if (key.length > 0) {
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source = source.filter(it => {
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for (let k of searchkeys) {
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if (contains(it[k].toLowerCase(), key)) {
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return true;
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}
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}
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return false;
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});
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}
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this.#filllist(source);
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this.#container.classList.add('active');
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});
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label.addEventListener('blur', e => this.select(e.target.value));
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label.addEventListener('mousedown', e => this.#expanded && e.stopPropagation());
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} else {
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isPositive(options.tabindex) && header.setAttribute('tabindex', options.tabindex);
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label = document.createElement('label');
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label.className = 'dropdown-text';
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}
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this.#label = label;
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if (options.multiselect) {
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if (Array.isArray(options.selectedlist)) {
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this.selectlist(options.selectedlist, true);
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} else {
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this.#allChecked = true;
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label.innerText = r('allItem', '( All )');
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}
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} else if (options.selected != null) {
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this.select(options.selected, true);
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}
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header.appendChild(label);
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const caret = document.createElement('label');
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caret.className = 'dropdown-caret';
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header.appendChild(caret);
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wrapper.appendChild(header);
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this.disabled = options.disabled || false;
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return wrapper;
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}
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get multiselect() { return this.#options.multiselect }
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get disabled() { return this.#wrapper == null || this.#wrapper.querySelector('.dropdown-header.disabled') != null }
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set disabled(flag) {
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if (this.#wrapper == null) {
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return;
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}
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if (flag) {
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this.#wrapper.querySelector('.dropdown-header').classList.add('disabled');
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} else {
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this.#wrapper.querySelector('.dropdown-header').classList.remove('disabled');
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}
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}
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get source() {
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let source = this.#source;
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if (source == null || !Array.isArray(source)) {
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if (typeof this.sourceFilter === 'function') {
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source = this.sourceFilter();
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}
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if (!Array.isArray(source)) {
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source = [];
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}
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this.#source = source;
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}
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return source;
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}
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set source(list) {
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if (!Array.isArray(list)) {
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return;
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}
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this.#source = list;
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if (this.#expanded) {
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setTimeout(() => this.#dropdown(), 120);
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}
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}
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get selected() { return this.#selected }
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get selectedlist() { return this.#selectedList || [] }
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select(selected, init) {
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if (this.#lastSelected === selected) {
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return false;
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}
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this.#lastSelected = selected;
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const valuekey = this.#options.valuekey;
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const textkey = this.#options.textkey;
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let item = this.source.find(it => it[valuekey] === selected);
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if (this.#options.input) {
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if (item == null) {
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item = {};
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item[valuekey] = selected;
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}
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this.#label.value = selected;
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} else {
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if (item == null) {
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this.#selected = null;
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this.#label.innerText = ' ';
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return false;
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}
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let text = item[textkey];
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if (nullOrEmpty(text)) {
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text = ' ';
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}
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this.#label.innerText = text;
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}
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this.#selected = item;
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if (!init && typeof this.onselected === 'function') {
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this.onselected(item);
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}
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}
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selectlist(selectedlist, init) {
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const source = this.source;
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const valuekey = this.#options.valuekey;
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const textkey = this.#options.textkey;
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const itemlist = selectedlist.map(v => {
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let item = source.find(it => it[valuekey] === v);
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if (item == null) {
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item = {};
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item[valuekey] = v;
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item[textkey] = v;
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}
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return item;
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});
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const none = r('noneItem', '( None )');
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if (itemlist.length === 0) {
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this.#selectedList = null;
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this.#label.innerText = none;
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return false;
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}
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const text = itemlist.map(it => it[textkey]).join(', ');
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if (nullOrEmpty(text)) {
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text = none;
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}
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this.#selectedList = itemlist;
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this.#label.innerText = text;
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if (!init && typeof this.onselectedlist === 'function') {
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this.onselectedlist(itemlist);
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}
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}
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get #expanded() { return this.#container != null && this.#container.style.visibility === 'visible' }
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#dropdown(flag) {
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flag ??= true;
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const options = this.#options;
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const textkey = options.textkey;
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let panel = this.#container;
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if (panel == null) {
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panel = document.createElement('div');
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panel.className = 'dropdown-panel';
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// search box
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if (options.search) {
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let searchkeys = options.searchkeys;
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if (!Array.isArray(searchkeys) || searchkeys.length === 0) {
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searchkeys = [textkey];
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}
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const search = document.createElement('div');
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search.className = 'dropdown-search';
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const input = document.createElement('input');
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input.setAttribute('type', 'text');
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isPositive(options.tabindex) && input.setAttribute('tabindex', options.tabindex);
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!nullOrEmpty(options.searchplaceholder) && input.setAttribute('placeholder', options.searchplaceholder);
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input.addEventListener('input', e => {
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const key = e.target.value.toLowerCase();
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let source = this.source;
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if (key.length > 0) {
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source = source.filter(it => {
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for (let k of searchkeys) {
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if (contains(it[k].toLowerCase(), key)) {
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return true;
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}
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}
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return false;
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});
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}
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this.#filllist(source);
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})
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search.appendChild(input);
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search.appendChild(createIcon('fa-light', 'search'));
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panel.appendChild(search);
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}
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// list
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const list = document.createElement('ul');
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list.className = 'dropdown-list';
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if (!this.multiselect) {
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list.addEventListener('click', e => {
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let li = e.target;
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while (li.tagName !== 'LI') {
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li = li.parentElement;
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if (li == null) {
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return;
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}
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}
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const value = li.dataset.value;
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if (this.select(value) !== false) {
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dropdownGlobal.clear();
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}
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});
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}
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panel.appendChild(list);
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this.#container = panel;
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this.#wrapper.appendChild(panel);
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this.#filllist(this.source);
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}
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if (flag) {
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if (!options.slidefixed) {
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let parent = options.parent ?? document.body;
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const height = panel.offsetHeight;
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if (this.#wrapper.offsetTop - parent.offsetTop + DropdownTitleHeight + height >= parent.offsetHeight) {
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panel.style.marginTop = -height - DropdownTitleHeight - 2;
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panel.classList.add('slide-up');
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} else {
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panel.style.marginTop = null;
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panel.classList.remove('slide-up');
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}
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}
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panel.classList.add('active');
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// search input
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// const inputSearch = panel.querySelector('.dropdown-search > input');
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// if (!nullOrEmpty(inputSearch.value)) {
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// const event = new InputEvent('type');
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// inputSearch.dispatchEvent(event);
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// }
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} else {
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panel.classList.remove('active');
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}
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}
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#filllist(source) {
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const list = this.#container.querySelector('.dropdown-list');
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list.replaceChildren();
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const multiselect = this.multiselect;
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const allchecked = this.#allChecked;
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if (multiselect) {
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const liall = document.createElement('li');
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const boxall = createCheckbox({
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label: r('allItem', '( All )'),
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checked: allchecked,
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customerAttributes: { 'isall': '1' },
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onchange: e => this.#triggerselect(e.target)
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});
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liall.appendChild(boxall);
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list.appendChild(liall);
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}
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// TODO: virtual mode
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const valuekey = this.#options.valuekey;
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const textkey = this.#options.textkey;
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const htmlkey = this.#options.htmlkey;
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const selected = this.selected;
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const selectedlist = this.selectedlist;
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let scrolled;
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source.slice(0, 200).forEach((item, i) => {
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const val = item[valuekey];
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const li = document.createElement('li');
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li.dataset.value = val;
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li.setAttribute('title', item[textkey]);
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let label;
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const html = item[htmlkey];
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if (html instanceof HTMLElement) {
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label = html;
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}
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if (multiselect) {
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const selected = selectedlist.some(s => s[valuekey] === val);
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if (label == null) {
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label = document.createElement('span');
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label.innerText = item[textkey];
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}
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const box = createCheckbox({
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label,
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checked: allchecked || selected,
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customerAttributes: {
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'class': 'dataitem',
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'data-value': val
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},
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onchange: e => this.#triggerselect(e.target)
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});
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li.appendChild(box);
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} else {
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if (label == null) {
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li.innerText = item[textkey];
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} else {
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li.appendChild(label);
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}
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if (selected != null && selected[valuekey] === val) {
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scrolled = DropdownItemHeight * i;
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li.classList.add('selected');
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}
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}
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list.appendChild(li);
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});
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if (scrolled != null) {
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setTimeout(() => list.scrollTop = scrolled, 10);
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}
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}
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#triggerselect(checkbox) {
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let list;
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const valuekey = this.#options.valuekey;
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const textkey = this.#options.textkey;
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if (checkbox.getAttribute('isall') === '1') {
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const allchecked = this.#allChecked = checkbox.checked;
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const boxes = this.#container.querySelectorAll('input.dataitem');
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boxes.forEach(box => box.checked = allchecked);
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list = [];
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} else if (checkbox.checked) {
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if (this.#container.querySelectorAll('input.dataitem:not(:checked)').length === 0) {
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this.#allChecked = true;
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this.#container.querySelector('input[isall="1"]').checked = true;
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list = [];
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} else {
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const source = this.source;
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list = [...this.#container.querySelectorAll('input.dataitem:checked')]
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.map(c => source.find(it => it[valuekey] === c.dataset.value))
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.filter(it => it != null);
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}
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} else {
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const val = checkbox.dataset.value;
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if (this.#allChecked) {
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this.#allChecked = false;
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this.#container.querySelector('input[isall="1"]').checked = false;
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list = this.source.filter(it => it[valuekey] !== val);
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} else {
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list = this.selectedlist.filter(it => it[valuekey] !== val);
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}
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}
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let text = this.#allChecked ? r('allItem', '( All )') : list.map(it => it[textkey]).join(', ');
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if (nullOrEmpty(text)) {
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text = r('noneItem', '( None )');
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}
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this.#selectedList = list;
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this.#label.innerText = text;
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if (typeof this.onselectedlist === 'function') {
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this.onselectedlist(itemlist);
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}
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}
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}
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export default Dropdown;
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