553 lines
13 KiB
JavaScript
553 lines
13 KiB
JavaScript
/**
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* Simple, lightweight, usable local autocomplete library for modern browsers
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* Because there weren’t enough autocomplete scripts in the world? Because I’m completely insane and have NIH syndrome? Probably both. :P
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* @author Lea Verou http://leaverou.github.io/awesomplete
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* MIT license
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*/
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(function () {
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var _ = function (input, o) {
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var me = this;
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// Keep track of number of instances for unique IDs
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_.count = (_.count || 0) + 1;
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this.count = _.count;
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// Setup
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this.isOpened = false;
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this.input = $(input);
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this.input.setAttribute("autocomplete", "off");
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this.input.setAttribute("aria-expanded", "false");
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this.input.setAttribute("aria-owns", "awesomplete_list_" + this.count);
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this.input.setAttribute("role", "combobox");
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// store constructor options in case we need to distinguish
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// between default and customized behavior later on
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this.options = o = o || {};
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configure(this, {
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minChars: 2,
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maxItems: 10,
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autoFirst: false,
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data: _.DATA,
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filter: _.FILTER_CONTAINS,
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sort: o.sort === false ? false : _.SORT_BYLENGTH,
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container: _.CONTAINER,
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item: _.ITEM,
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replace: _.REPLACE,
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tabSelect: false
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}, o);
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this.index = -1;
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// Create necessary elements
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this.container = this.container(input);
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this.ul = $.create("ul", {
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hidden: "hidden",
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role: "listbox",
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id: "awesomplete_list_" + this.count,
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inside: this.container
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});
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this.status = $.create("span", {
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className: "visually-hidden",
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role: "status",
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"aria-live": "assertive",
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"aria-atomic": true,
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inside: this.container,
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textContent: this.minChars != 0 ? ("Type " + this.minChars + " or more characters for results.") : "Begin typing for results."
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});
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// Bind events
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this._events = {
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input: {
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"input": this.evaluate.bind(this),
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"blur": this.close.bind(this, { reason: "blur" }),
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"keydown": function(evt) {
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var c = evt.keyCode;
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// If the dropdown `ul` is in view, then act on keydown for the following keys:
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// Enter / Esc / Up / Down
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if(me.opened) {
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if (c === 13 && me.selected) { // Enter
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evt.preventDefault();
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me.select(undefined, undefined, evt);
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}
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else if (c === 9 && me.selected && me.tabSelect) {
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me.select(undefined, undefined, evt);
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}
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else if (c === 27) { // Esc
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me.close({ reason: "esc" });
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}
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else if (c === 38 || c === 40) { // Down/Up arrow
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evt.preventDefault();
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me[c === 38? "previous" : "next"]();
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}
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}
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}
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},
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form: {
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"submit": this.close.bind(this, { reason: "submit" })
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},
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ul: {
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// Prevent the default mousedowm, which ensures the input is not blurred.
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// The actual selection will happen on click. This also ensures dragging the
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// cursor away from the list item will cancel the selection
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"mousedown": function(evt) {
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evt.preventDefault();
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},
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// The click event is fired even if the corresponding mousedown event has called preventDefault
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"click": function(evt) {
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var li = evt.target;
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if (li !== this) {
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while (li && !/li/i.test(li.nodeName)) {
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li = li.parentNode;
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}
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if (li && evt.button === 0) { // Only select on left click
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evt.preventDefault();
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me.select(li, evt.target, evt);
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}
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}
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}
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}
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};
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$.bind(this.input, this._events.input);
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$.bind(this.input.form, this._events.form);
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$.bind(this.ul, this._events.ul);
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if (this.input.hasAttribute("list")) {
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this.list = "#" + this.input.getAttribute("list");
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this.input.removeAttribute("list");
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}
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else {
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this.list = this.input.getAttribute("data-list") || o.list || [];
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}
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_.all.push(this);
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};
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_.prototype = {
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set list(list) {
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if (Array.isArray(list)) {
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this._list = list;
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}
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else if (typeof list === "string" && list.indexOf(",") > -1) {
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this._list = list.split(/\s*,\s*/);
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}
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else { // Element or CSS selector
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list = $(list);
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if (list && list.children) {
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var items = [];
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slice.apply(list.children).forEach(function (el) {
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if (!el.disabled) {
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var text = el.textContent.trim();
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var value = el.value || text;
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var label = el.label || text;
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if (value !== "") {
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items.push({ label: label, value: value });
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}
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}
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});
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this._list = items;
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}
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}
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if (document.activeElement === this.input) {
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this.evaluate();
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}
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},
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get selected() {
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return this.index > -1;
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},
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get opened() {
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return this.isOpened;
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},
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close: function (o) {
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if (!this.opened) {
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return;
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}
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this.input.setAttribute("aria-expanded", "false");
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this.ul.setAttribute("hidden", "");
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this.isOpened = false;
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this.index = -1;
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this.status.setAttribute("hidden", "");
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$.fire(this.input, "awesomplete-close", o || {});
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},
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open: function () {
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this.input.setAttribute("aria-expanded", "true");
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this.ul.removeAttribute("hidden");
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this.isOpened = true;
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this.status.removeAttribute("hidden");
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if (this.autoFirst && this.index === -1) {
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this.goto(0);
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}
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$.fire(this.input, "awesomplete-open");
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},
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destroy: function() {
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//remove events from the input and its form
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$.unbind(this.input, this._events.input);
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$.unbind(this.input.form, this._events.form);
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// cleanup container if it was created by Awesomplete but leave it alone otherwise
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if (!this.options.container) {
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//move the input out of the awesomplete container and remove the container and its children
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var parentNode = this.container.parentNode;
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parentNode.insertBefore(this.input, this.container);
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parentNode.removeChild(this.container);
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}
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//remove autocomplete and aria-autocomplete attributes
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this.input.removeAttribute("autocomplete");
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this.input.removeAttribute("aria-autocomplete");
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//remove this awesomeplete instance from the global array of instances
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var indexOfAwesomplete = _.all.indexOf(this);
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if (indexOfAwesomplete !== -1) {
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_.all.splice(indexOfAwesomplete, 1);
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}
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},
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next: function () {
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var count = this.ul.children.length;
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this.goto(this.index < count - 1 ? this.index + 1 : (count ? 0 : -1) );
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},
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previous: function () {
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var count = this.ul.children.length;
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var pos = this.index - 1;
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this.goto(this.selected && pos !== -1 ? pos : count - 1);
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},
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// Should not be used, highlights specific item without any checks!
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goto: function (i) {
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var lis = this.ul.children;
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if (this.selected) {
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lis[this.index].setAttribute("aria-selected", "false");
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}
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this.index = i;
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if (i > -1 && lis.length > 0) {
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lis[i].setAttribute("aria-selected", "true");
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this.status.textContent = lis[i].textContent + ", list item " + (i + 1) + " of " + lis.length;
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this.input.setAttribute("aria-activedescendant", this.ul.id + "_item_" + this.index);
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// scroll to highlighted element in case parent's height is fixed
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this.ul.scrollTop = lis[i].offsetTop - this.ul.clientHeight + lis[i].clientHeight;
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$.fire(this.input, "awesomplete-highlight", {
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text: this.suggestions[this.index]
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});
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}
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},
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select: function (selected, origin, originalEvent) {
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if (selected) {
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this.index = $.siblingIndex(selected);
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} else {
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selected = this.ul.children[this.index];
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}
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if (selected) {
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var suggestion = this.suggestions[this.index];
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var allowed = $.fire(this.input, "awesomplete-select", {
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text: suggestion,
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origin: origin || selected,
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originalEvent: originalEvent
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});
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if (allowed) {
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this.replace(suggestion);
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this.close({ reason: "select" });
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$.fire(this.input, "awesomplete-selectcomplete", {
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text: suggestion,
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originalEvent: originalEvent
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});
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}
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}
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},
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evaluate: function() {
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var me = this;
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var value = this.input.value;
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if (value.length >= this.minChars && this._list && this._list.length > 0) {
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this.index = -1;
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// Populate list with options that match
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this.ul.innerHTML = "";
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this.suggestions = this._list
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.map(function(item) {
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return new Suggestion(me.data(item, value));
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})
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.filter(function(item) {
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return me.filter(item, value);
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});
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if (this.sort !== false) {
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this.suggestions = this.suggestions.sort(this.sort);
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}
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this.suggestions = this.suggestions.slice(0, this.maxItems);
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this.suggestions.forEach(function(text, index) {
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me.ul.appendChild(me.item(text, value, index));
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});
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if (this.ul.children.length === 0) {
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this.status.textContent = "No results found";
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this.close({ reason: "nomatches" });
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} else {
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this.open();
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this.status.textContent = this.ul.children.length + " results found";
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}
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}
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else {
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this.close({ reason: "nomatches" });
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this.status.textContent = "No results found";
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}
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}
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};
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// Static methods/properties
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_.all = [];
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_.FILTER_CONTAINS = function (text, input) {
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return RegExp($.regExpEscape(input.trim()), "i").test(text);
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};
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_.FILTER_STARTSWITH = function (text, input) {
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return RegExp("^" + $.regExpEscape(input.trim()), "i").test(text);
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};
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_.SORT_BYLENGTH = function (a, b) {
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if (a.length !== b.length) {
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return a.length - b.length;
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}
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return a < b? -1 : 1;
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};
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_.CONTAINER = function (input) {
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return $.create("div", {
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className: "awesomplete",
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around: input
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});
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}
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_.ITEM = function (text, input, item_id) {
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var html = input.trim() === "" ? text : text.replace(RegExp($.regExpEscape(input.trim()), "gi"), "<mark>$&</mark>");
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return $.create("li", {
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innerHTML: html,
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"role": "option",
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"aria-selected": "false",
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"id": "awesomplete_list_" + this.count + "_item_" + item_id
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});
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};
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_.REPLACE = function (text) {
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this.input.value = text.value;
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};
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_.DATA = function (item/*, input*/) { return item; };
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// Private functions
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function Suggestion(data) {
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var o = Array.isArray(data)
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? { label: data[0], value: data[1] }
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: typeof data === "object" && "label" in data && "value" in data ? data : { label: data, value: data };
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this.label = o.label || o.value;
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this.value = o.value;
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}
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Object.defineProperty(Suggestion.prototype = Object.create(String.prototype), "length", {
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get: function() { return this.label.length; }
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});
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Suggestion.prototype.toString = Suggestion.prototype.valueOf = function () {
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return "" + this.label;
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};
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function configure(instance, properties, o) {
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for (var i in properties) {
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var initial = properties[i],
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attrValue = instance.input.getAttribute("data-" + i.toLowerCase());
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if (typeof initial === "number") {
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instance[i] = parseInt(attrValue);
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}
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else if (initial === false) { // Boolean options must be false by default anyway
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instance[i] = attrValue !== null;
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}
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else if (initial instanceof Function) {
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instance[i] = null;
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}
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else {
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instance[i] = attrValue;
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}
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if (!instance[i] && instance[i] !== 0) {
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instance[i] = (i in o)? o[i] : initial;
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}
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}
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}
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// Helpers
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var slice = Array.prototype.slice;
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function $(expr, con) {
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return typeof expr === "string"? (con || document).querySelector(expr) : expr || null;
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}
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function $$(expr, con) {
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return slice.call((con || document).querySelectorAll(expr));
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}
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$.create = function(tag, o) {
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var element = document.createElement(tag);
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for (var i in o) {
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var val = o[i];
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if (i === "inside") {
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$(val).appendChild(element);
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}
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else if (i === "around") {
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var ref = $(val);
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ref.parentNode.insertBefore(element, ref);
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element.appendChild(ref);
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if (ref.getAttribute("autofocus") != null) {
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ref.focus();
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}
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}
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else if (i in element) {
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element[i] = val;
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}
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else {
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element.setAttribute(i, val);
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}
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}
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return element;
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};
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$.bind = function(element, o) {
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if (element) {
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for (var event in o) {
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var callback = o[event];
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event.split(/\s+/).forEach(function (event) {
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element.addEventListener(event, callback);
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});
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}
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}
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};
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$.unbind = function(element, o) {
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if (element) {
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for (var event in o) {
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var callback = o[event];
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event.split(/\s+/).forEach(function(event) {
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element.removeEventListener(event, callback);
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});
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}
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}
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};
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$.fire = function(target, type, properties) {
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var evt = document.createEvent("HTMLEvents");
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evt.initEvent(type, true, true );
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for (var j in properties) {
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evt[j] = properties[j];
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}
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return target.dispatchEvent(evt);
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};
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$.regExpEscape = function (s) {
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return s.replace(/[-\\^$*+?.()|[\]{}]/g, "\\$&");
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};
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$.siblingIndex = function (el) {
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/* eslint-disable no-cond-assign */
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for (var i = 0; el = el.previousElementSibling; i++);
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return i;
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};
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// Initialization
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function init() {
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$$("input.awesomplete").forEach(function (input) {
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new _(input);
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});
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}
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// Make sure to export Awesomplete on self when in a browser
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if (typeof self !== "undefined") {
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self.Awesomplete = _;
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}
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// Are we in a browser? Check for Document constructor
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if (typeof Document !== "undefined") {
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// DOM already loaded?
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if (document.readyState !== "loading") {
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init();
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}
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else {
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// Wait for it
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document.addEventListener("DOMContentLoaded", init);
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}
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}
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_.$ = $;
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_.$$ = $$;
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// Expose Awesomplete as a CJS module
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if (typeof module === "object" && module.exports) {
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module.exports = _;
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}
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return _;
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}());
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