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