LeaVerou/awesomplete

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* Simple, lightweight, usable local autocomplete library for modern browsers\n * Because there weren’t enough autocomplete scripts in the world? Because I’m completely insane and have NIH syndrome? Probably both. :P\n * @author Lea Verou http://leaverou.github.io/awesomplete\n * MIT license\n */\n\n(function () {\n\nvar _ = function (input, o) {\n\tvar me = this;\n\n\t// Keep track of number of instances for unique IDs\n\t_.count = (_.count || 0) + 1;\n\tthis.count = _.count;\n\n\t// Setup\n\n\tthis.isOpened = false;\n\n\tthis.input = $(input);\n\tthis.input.setAttribute(\"autocomplete\", \"off\");\n\tthis.input.setAttribute(\"aria-autocomplete\", \"list\");\n\tthis.input.setAttribute(\"aria-expanded\", \"false\");\n\tthis.input.setAttribute(\"aria-owns\", \"awesomplete_list_\" + this.count);\n\tthis.input.setAttribute(\"role\", \"combobox\");\n\n\t// store constructor options in case we need to distinguish\n\t// between default and customized behavior later on\n\tthis.options = o = o || {};\n\n\tconfigure(this, {\n\t\tminChars: 2,\n\t\tmaxItems: 10,\n\t\tautoFirst: false,\n\t\tdata: _.DATA,\n\t\tfilter: _.FILTER_CONTAINS,\n\t\tsort: o.sort === false ? false : _.SORT_BYLENGTH,\n\t\tcontainer: _.CONTAINER,\n\t\titem: _.ITEM,\n\t\treplace: _.REPLACE,\n\t\ttabSelect: false,\n\t\tlistLabel: \"Results List\",\n\t\tstatusNoResults: \"No results found\",\n\t\tstatusXResults: \"{0} results found\", // uses index placeholder {0}\n\t\tstatusTypeXChar: \"Type {0} or more characters for results\"\n\t}, o);\n\n\tthis.index = -1;\n\n\t// Create necessary elements\n\n\tthis.container = this.container(input);\n\n\tthis.ul = $.create(\"ul\", {\n\t\thidden: \"hidden\",\n\t\trole: \"listbox\",\n\t\tid: \"awesomplete_list_\" + this.count,\n\t\tinside: this.container,\n\t\t\"aria-label\": this.listLabel\n\t});\n\n\tthis.status = $.create(\"span\", {\n\t\tclassName: \"visually-hidden\",\n\t\trole: \"status\",\n\t\t\"aria-live\": \"assertive\",\n\t\t\"aria-atomic\": true,\n\t\tinside: this.container,\n\t\ttextContent: \"\"  // live region should start empty. Only when the text is changed it will be read by the screen reader.\n\t});\n\n\t// Bind events\n\n\tthis._events = {\n\t\tinput: {\n\t\t\t\"input\": this.evaluate.bind(this),\n\t\t\t\"blur\": this.close.bind(this, { reason: \"blur\" }),\n\t\t\t\"keydown\": function(evt) {\n\t\t\t\tvar c = evt.keyCode;\n\n\t\t\t\t// If the dropdown `ul` is in view, then act on keydown for the following keys:\n\t\t\t\t// Enter / Esc / Up / Down\n\t\t\t\tif(me.opened) {\n\t\t\t\t\tif (c === 13 && me.selected) { // Enter\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme.select(undefined, undefined, evt);\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 9 && me.selected && me.tabSelect) {\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme.select(undefined, undefined, evt);\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 27) { // Esc\n\t\t\t\t\t\tme.close({ reason: \"esc\" });\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 38 || c === 40) { // Down/Up arrow\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme[c === 38? \"previous\" : \"next\"]();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t},\n\t\tform: {\n\t\t\t\"submit\": this.close.bind(this, { reason: \"submit\" })\n\t\t},\n\t\tul: {\n\t\t\t// Prevent the default mousedowm, which ensures the input is not blurred.\n\t\t\t// The actual selection will happen on click. This also ensures dragging the\n\t\t\t// cursor away from the list item will cancel the selection\n\t\t\t\"mousedown\": function(evt) {\n\t\t\t\tevt.preventDefault();\n\t\t\t},\n\t\t\t// The click event is fired even if the corresponding mousedown event has called preventDefault\n\t\t\t\"click\": function(evt) {\n\t\t\t\tvar li = evt.target;\n\n\t\t\t\tif (li !== this) {\n\n\t\t\t\t\twhile (li && !/li/i.test(li.nodeName)) {\n\t\t\t\t\t\tli = li.parentNode;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (li && evt.button === 0) {  // Only select on left click\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme.select(li, evt.target, evt);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n\n\t$.bind(this.input, this._events.input);\n\t$.bind(this.input.form, this._events.form);\n\t$.bind(this.ul, this._events.ul);\n\n\tif (this.input.hasAttribute(\"list\")) {\n\t\tthis.list = \"#\" + this.input.getAttribute(\"list\");\n\t\tthis.input.removeAttribute(\"list\");\n\t}\n\telse {\n\t\tthis.list = this.input.getAttribute(\"data-list\") || o.list || [];\n\t}\n\n\t_.all.push(this);\n};\n\n_.prototype = {\n\tset list(list) {\n\t\tif (Array.isArray(list)) {\n\t\t\tthis._list = list;\n\t\t}\n\t\telse if (typeof list === \"string\" && list.indexOf(\",\") > -1) {\n\t\t\t\tthis._list = list.split(/\\s*,\\s*/);\n\t\t}\n\t\telse { // Element or CSS selector\n\t\t\tlist = $(list);\n\n\t\t\tif (list && list.children) {\n\t\t\t\tvar items = [];\n\t\t\t\tslice.apply(list.children).forEach(function (el) {\n\t\t\t\t\tif (!el.disabled) {\n\t\t\t\t\t\tvar text = el.textContent.trim();\n\t\t\t\t\t\tvar value = el.value || text;\n\t\t\t\t\t\tvar label = el.label || text;\n\t\t\t\t\t\tif (value !== \"\") {\n\t\t\t\t\t\t\titems.push({ label: label, value: value });\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t});\n\t\t\t\tthis._list = items;\n\t\t\t}\n\t\t}\n\n\t\tif (document.activeElement === this.input) {\n\t\t\tthis.evaluate();\n\t\t}\n\t},\n\n\tget selected() {\n\t\treturn this.index > -1;\n\t},\n\n\tget opened() {\n\t\treturn this.isOpened;\n\t},\n\n\tclose: function (o) {\n\t\tif (!this.opened) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.input.setAttribute(\"aria-expanded\", \"false\");\n\t\tthis.ul.setAttribute(\"hidden\", \"\");\n\t\tthis.isOpened = false;\n\t\tthis.index = -1;\n\n\t\tthis.status.setAttribute(\"hidden\", \"\");\n\n\t\t$.fire(this.input, \"awesomplete-close\", o || {});\n\t},\n\n\topen: function () {\n\t\tthis.input.setAttribute(\"aria-expanded\", \"true\");\n\t\tthis.ul.removeAttribute(\"hidden\");\n\t\tthis.isOpened = true;\n\n\t\tthis.status.removeAttribute(\"hidden\");\n\n\t\tif (this.autoFirst && this.index === -1) {\n\t\t\tthis.goto(0);\n\t\t}\n\n\t\t$.fire(this.input, \"awesomplete-open\");\n\t},\n\n\tdestroy: function() {\n\t\t//remove events from the input and its form\n\t\t$.unbind(this.input, this._events.input);\n\t\t$.unbind(this.input.form, this._events.form);\n\n\t\t// cleanup container if it was created by Awesomplete but leave it alone otherwise\n\t\tif (!this.options.container) {\n\t\t\t//move the input out of the awesomplete container and remove the container and its children\n\t\t\tvar parentNode = this.container.parentNode;\n\n\t\t\tparentNode.insertBefore(this.input, this.container);\n\t\t\tparentNode.removeChild(this.container);\n\t\t}\n\n\t\t// remove autocomplete and aria attributes\n\t\tthis.input.removeAttribute(\"autocomplete\");\n\t\tthis.input.removeAttribute(\"aria-autocomplete\");\n\t\tthis.input.removeAttribute(\"aria-expanded\");\n\t\tthis.input.removeAttribute(\"aria-owns\");\n\t\tthis.input.removeAttribute(\"role\");\n\n\t\t//remove this awesomeplete instance from the global array of instances\n\t\tvar indexOfAwesomplete = _.all.indexOf(this);\n\n\t\tif (indexOfAwesomplete !== -1) {\n\t\t\t_.all.splice(indexOfAwesomplete, 1);\n\t\t}\n\t},\n\n\tnext: function () {\n\t\tvar count = this.ul.children.length;\n\t\tthis.goto(this.index < count - 1 ? this.index + 1 : (count ? 0 : -1) );\n\t},\n\n\tprevious: function () {\n\t\tvar count = this.ul.children.length;\n\t\tvar pos = this.index - 1;\n\n\t\tthis.goto(this.selected && pos !== -1 ? pos : count - 1);\n\t},\n\n\t// Should not be used, highlights specific item without any checks!\n\tgoto: function (i) {\n\t\tvar lis = this.ul.children;\n\n\t\tif (this.selected) {\n\t\t\tlis[this.index].setAttribute(\"aria-selected\", \"false\");\n\t\t}\n\n\t\tthis.index = i;\n\n\t\tif (i > -1 && lis.length > 0) {\n\t\t\tlis[i].setAttribute(\"aria-selected\", \"true\");\n\n\t\t\t// fix: Turned off this status update.\n\t\t\t//\t\tScreen readers Voiceover and Talkback won't read this status change.\n\t\t\t//\t\tNarrator and NVDA do, but they already tell: 'X of Y (selected)'\n\t\t\t// this.status.textContent = lis[i].textContent + \", list item \" + (i + 1) + \" of \" + lis.length;\n\n\t\t\tthis.input.setAttribute(\"aria-activedescendant\", this.ul.id + \"_item_\" + this.index);\n\n\t\t\t// scroll to highlighted element in case parent's height is fixed\n\t\t\tthis.ul.scrollTop = lis[i].offsetTop - this.ul.clientHeight + lis[i].clientHeight;\n\n\t\t\t$.fire(this.input, \"awesomplete-highlight\", {\n\t\t\t\ttext: this.suggestions[this.index]\n\t\t\t});\n\t\t}\n\t},\n\n\tselect: function (selected, origin, originalEvent) {\n\t\tif (selected) {\n\t\t\tthis.index = $.siblingIndex(selected);\n\t\t} else {\n\t\t\tselected = this.ul.children[this.index];\n\t\t}\n\n\t\tif (selected) {\n\t\t\tvar suggestion = this.suggestions[this.index];\n\n\t\t\tvar allowed = $.fire(this.input, \"awesomplete-select\", {\n\t\t\t\ttext: suggestion,\n\t\t\t\torigin: origin || selected,\n\t\t\t\toriginalEvent: originalEvent\n\t\t\t});\n\n\t\t\tif (allowed) {\n\t\t\t\tthis.replace(suggestion);\n\t\t\t\tthis.close({ reason: \"select\" });\n\t\t\t\t$.fire(this.input, \"awesomplete-selectcomplete\", {\n\t\t\t\t\ttext: suggestion,\n\t\t\t\t\toriginalEvent: originalEvent\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t},\n\n\tevaluate: function() {\n\t\tvar me = this;\n\t\tvar value = this.input.value;\n\n\t\tif (value.length >= this.minChars && this._list && this._list.length > 0) {\n\t\t\tthis.index = -1;\n\t\t\t// Populate list with options that match\n\t\t\tthis.ul.innerHTML = \"\";\n\n\t\t\tthis.suggestions = this._list\n\t\t\t\t.map(function(item) {\n\t\t\t\t\treturn new Suggestion(me.data(item, value));\n\t\t\t\t})\n\t\t\t\t.filter(function(item) {\n\t\t\t\t\treturn me.filter(item, value);\n\t\t\t\t});\n\n\t\t\tif (this.sort !== false) {\n\t\t\t\tthis.suggestions = this.suggestions.sort(this.sort);\n\t\t\t}\n\n\t\t\tthis.suggestions = this.suggestions.slice(0, this.maxItems);\n\n\t\t\tthis.suggestions.forEach(function(text, index) {\n\t\t\t\t\tme.ul.appendChild(me.item(text, value, index));\n\t\t\t\t});\n\n\t\t\tif (this.ul.children.length === 0) {\n\n\t\t\t\tthis.status.textContent = this.statusNoResults;\n\n\t\t\t\tthis.close({ reason: \"nomatches\" });\n\n\t\t\t} else {\n\t\t\t\tthis.open();\n\n\t\t\t\tthis.status.textContent = this.statusXResults.replaceAll('{0}', this.ul.children.length); // N results found;\n\t\t\t}\n\t\t}\n\t\telse {\n\n\t\t\tthis.close({ reason: \"nomatches\" });\n\n\t\t\tif (this.minChar <= 1 || value.length >= this.minChars) {\n\t\t\t   this.status.textContent = this.statusNoResults;\n\t\t\t} else {\n\t\t\t   this.status.textContent = this.statusTypeXChar.replaceAll('{0}', this.minChars); // Type N or more characters for results\n\t\t\t}\n\n\t\t}\n\t}\n};\n\n// Static methods/properties\n\n_.all = [];\n\n_.FILTER_CONTAINS = function (text, input) {\n\treturn RegExp($.regExpEscape(input.trim()), \"i\").test(text);\n};\n\n_.FILTER_STARTSWITH = function (text, input) {\n\treturn RegExp(\"^\" + $.regExpEscape(input.trim()), \"i\").test(text);\n};\n\n_.SORT_BYLENGTH = function (a, b) {\n\tif (a.length !== b.length) {\n\t\treturn a.length - b.length;\n\t}\n\n\treturn a < b? -1 : 1;\n};\n\n_.CONTAINER = function (input) {\n\treturn $.create(\"div\", {\n\t\tclassName: \"awesomplete\",\n\t\taround: input\n\t});\n}\n\n_.ITEM = function (text, input, item_id) {\n\tvar html = input.trim() === \"\" ? text : text.replace(RegExp($.regExpEscape(input.trim()), \"gi\"), \"<mark>$&</mark>\");\n\treturn $.create(\"li\", {\n\t\tinnerHTML: html,\n\t\t\"role\": \"option\",\n\t\t\"aria-selected\": \"false\",\n\t\t\"tabindex\": '0', // for the Talkback screen reader\n\t\t\"id\": \"awesomplete_list_\" + this.count + \"_item_\" + item_id\n\t});\n};\n\n_.REPLACE = function (text) {\n\tthis.input.value = text.value;\n};\n\n_.DATA = function (item/*, input*/) { return item; };\n\n// Private functions\n\nfunction Suggestion(data) {\n\tvar o = Array.isArray(data)\n\t  ? { label: data[0], value: data[1] }\n\t  : typeof data === \"object\" && \"label\" in data && \"value\" in data ? data : { label: data, value: data };\n\n\tthis.label = o.label || o.value;\n\tthis.value = o.value;\n}\nObject.defineProperty(Suggestion.prototype = Object.create(String.prototype), \"length\", {\n\tget: function() { return this.label.length; }\n});\nSuggestion.prototype.toString = Suggestion.prototype.valueOf = function () {\n\treturn \"\" + this.label;\n};\n\nfunction configure(instance, properties, o) {\n\tfor (var i in properties) {\n\t\tvar initial = properties[i],\n\t\t\tattrValue = instance.input.getAttribute(\"data-\" + i.toLowerCase());\n\n\t\tif (typeof initial === \"number\") {\n\t\t\tinstance[i] = parseInt(attrValue);\n\t\t}\n\t\telse if (initial === false) { // Boolean options must be false by default anyway\n\t\t\tinstance[i] = attrValue !== null;\n\t\t}\n\t\telse if (initial instanceof Function) {\n\t\t\tinstance[i] = null;\n\t\t}\n\t\telse {\n\t\t\tinstance[i] = attrValue;\n\t\t}\n\n\t\tif (!instance[i] && instance[i] !== 0) {\n\t\t\tinstance[i] = (i in o)? o[i] : initial;\n\t\t}\n\t}\n}\n\n// Helpers\n\nvar slice = Array.prototype.slice;\n\nfunction $(expr, con) {\n\treturn typeof expr === \"string\"? (con || document).querySelector(expr) : expr || null;\n}\n\nfunction $$(expr, con) {\n\treturn slice.call((con || document).querySelectorAll(expr));\n}\n\n$.create = function(tag, o) {\n\tvar element = document.createElement(tag);\n\n\tfor (var i in o) {\n\t\tvar val = o[i];\n\n\t\tif (i === \"inside\") {\n\t\t\t$(val).appendChild(element);\n\t\t}\n\t\telse if (i === \"around\") {\n\t\t\tvar ref = $(val);\n\t\t\tref.parentNode.insertBefore(element, ref);\n\t\t\telement.appendChild(ref);\n\n\t\t\tif (ref.getAttribute(\"autofocus\") != null) {\n\t\t\t\tref.focus();\n\t\t\t}\n\t\t}\n\t\telse if (i in element) {\n\t\t\telement[i] = val;\n\t\t}\n\t\telse {\n\t\t\telement.setAttribute(i, val);\n\t\t}\n\t}\n\n\treturn element;\n};\n\n$.bind = function(element, o) {\n\tif (element) {\n\t\tfor (var event in o) {\n\t\t\tvar callback = o[event];\n\n\t\t\tevent.split(/\\s+/).forEach(function (event) {\n\t\t\t\telement.addEventListener(event, callback);\n\t\t\t});\n\t\t}\n\t}\n};\n\n$.unbind = function(element, o) {\n\tif (element) {\n\t\tfor (var event in o) {\n\t\t\tvar callback = o[event];\n\n\t\t\tevent.split(/\\s+/).forEach(function(event) {\n\t\t\t\telement.removeEventListener(event, callback);\n\t\t\t});\n\t\t}\n\t}\n};\n\n$.fire = function(target, type, properties) {\n\tvar evt = document.createEvent(\"HTMLEvents\");\n\n\tevt.initEvent(type, true, true );\n\n\tfor (var j in properties) {\n\t\tevt[j] = properties[j];\n\t}\n\n\treturn target.dispatchEvent(evt);\n};\n\n$.regExpEscape = function (s) {\n\treturn s.replace(/[-\\\\^$*+?.()|[\\]{}]/g, \"\\\\$&\");\n};\n\n$.siblingIndex = function (el) {\n\t/* eslint-disable no-cond-assign */\n\tfor (var i = 0; el = el.previousElementSibling; i++);\n\treturn i;\n};\n\n// Initialization\n\nfunction init() {\n\t$$(\"input.awesomplete\").forEach(function (input) {\n\t\tnew _(input);\n\t});\n}\n\n// Make sure to export Awesomplete on self when in a browser\nif (typeof self !== \"undefined\") {\n\tself.Awesomplete = _;\n}\n\n// Are we in a browser? Check for Document constructor\nif (typeof Document !== \"undefined\") {\n\t// DOM already loaded?\n\tif (document.readyState !== \"loading\") {\n\t\tinit();\n\t}\n\telse {\n\t\t// Wait for it\n\t\tdocument.addEventListener(\"DOMContentLoaded\", init);\n\t}\n}\n\n_.$ = $;\n_.$$ = $$;\n\n// Expose Awesomplete as a CJS module\nif (typeof module === \"object\" && module.exports) {\n\tmodule.exports = _;\n}\n\nreturn _;\n\n}());\n"]}