389 lines
10 KiB
JavaScript
389 lines
10 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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// Setup
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this.input = $(input);
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this.input.setAttribute("aria-autocomplete", "list");
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o = o || {};
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configure.call(this, {
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minChars: 2,
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maxItems: 10,
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autoFirst: false,
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filter: _.FILTER_CONTAINS,
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sort: _.SORT_BYLENGTH,
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item: function (text, input) {
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return $.create("li", {
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innerHTML: text.replace(RegExp($.regExpEscape(input.trim()), "gi"), "<mark>$&</mark>"),
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"aria-selected": "false"
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});
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},
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replace: function (text) {
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this.input.value = text;
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}
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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 = $.create("div", {
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className: "awesomplete",
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around: input
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});
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this.ul = $.create("ul", {
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hidden: "",
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inside: this.container
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});
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this.status = $.create("span", {
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className: "visually-hidden",
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role: "status",
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"aria-live": "assertive",
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"aria-relevant": "additions",
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inside: this.container
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});
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// Bind events
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$.bind(this.input, {
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"input": this.evaluate.bind(this),
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"blur": this.close.bind(this),
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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();
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}
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else if (c === 27) { // Esc
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me.close();
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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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$.bind(this.input.form, {"submit": this.close.bind(this)});
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$.bind(this.ul, {"mousedown": 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) {
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me.select(li);
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}
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}
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}});
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if (this.input.hasAttribute("list")) {
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this.list = "#" + input.getAttribute("list");
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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 = $(list);
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if (list && list.children) {
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this._list = slice.apply(list.children).map(function (el) {
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return el.innerHTML.trim();
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});
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}
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}
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if (document.activeElement === this.input) {
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this.evaluate();
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}
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},
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get selected() {
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return this.index > -1;
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},
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get opened() {
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return this.ul && this.ul.getAttribute("hidden") == null;
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},
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close: function () {
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this.ul.setAttribute("hidden", "");
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this.index = -1;
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$.fire(this.input, "awesomplete-close");
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},
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open: function () {
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this.ul.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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$.fire(this.input, "awesomplete-open");
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},
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next: function () {
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var count = this.ul.children.length;
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this.goto(this.index < count - 1? this.index + 1 : -1);
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},
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previous: function () {
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var count = this.ul.children.length;
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this.goto(this.selected? this.index - 1 : count - 1);
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},
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// Should not be used, highlights specific item without any checks!
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goto: function (i) {
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var lis = this.ul.children;
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if (this.selected) {
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lis[this.index].setAttribute("aria-selected", "false");
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}
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this.index = i;
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if (i > -1 && lis.length > 0) {
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lis[i].setAttribute("aria-selected", "true");
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this.status.textContent = lis[i].textContent;
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}
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$.fire(this.input, "awesomplete-highlight");
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},
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select: function (selected) {
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selected = selected || this.ul.children[this.index];
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if (selected) {
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var prevented;
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$.fire(this.input, "awesomplete-select", {
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text: selected.textContent,
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preventDefault: function () {
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prevented = true;
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}
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});
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if (!prevented) {
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this.replace(selected.textContent);
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this.close();
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$.fire(this.input, "awesomplete-selectcomplete");
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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.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._list
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.filter(function(item) {
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return me.filter(item, value);
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})
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.sort(this.sort)
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.every(function(text, i) {
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me.ul.appendChild(me.item(text, value));
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return i < me.maxItems - 1;
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});
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if (this.ul.children.length === 0) {
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this.close();
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} else {
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this.open();
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}
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}
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else {
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this.close();
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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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// Private functions
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function configure(properties, o) {
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for (var i in properties) {
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var initial = properties[i],
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attrValue = this.input.getAttribute("data-" + i.toLowerCase());
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if (typeof initial === "number") {
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this[i] = +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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this[i] = attrValue !== null;
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}
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else if (initial instanceof Function) {
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this[i] = null;
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}
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else {
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this[i] = attrValue;
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}
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this[i] = this[i] || o[i] || initial;
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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 = $(val);
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ref.parentNode.insertBefore(element, ref);
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element.appendChild(ref);
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}
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else if (i in element) {
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element[i] = val;
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}
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else {
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element.setAttribute(i, val);
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}
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}
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return element;
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};
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$.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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$.fire = function(target, type, properties) {
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var evt = document.createEvent("HTMLEvents");
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evt.initEvent(type, true, true );
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for (var j in properties) {
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evt[j] = properties[j];
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}
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target.dispatchEvent(evt);
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};
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$.regExpEscape = function (s) {
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return s.replace(/[-\\^$*+?.()|[\]{}]/g, "\\$&");
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}
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// Initialization
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function init() {
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$$("input.awesomplete").forEach(function (input) {
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new Awesomplete(input);
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});
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}
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// Are we in a browser? Check for Document constructor
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if (typeof Document !== 'undefined') {
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// DOM already loaded?
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if (document.readyState !== "loading") {
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init();
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}
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else {
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// Wait for it
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document.addEventListener("DOMContentLoaded", init);
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}
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}
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_.$ = $;
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_.$$ = $$;
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// 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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// Expose Awesomplete as a CJS module
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if (typeof exports === 'object') {
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module.exports = _;
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}
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return _;
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}());
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