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typeahead.js
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typeahead.js
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/*!
* typeahead.js 0.9.3
* https://github.com/twitter/typeahead
* Copyright 2013 Twitter, Inc. and other contributors; Licensed MIT
*/
(function($) {
var VERSION = "0.9.3";
var utils = {
isMsie: function() {
var match = /(msie) ([\w.]+)/i.exec(navigator.userAgent);
return match ? parseInt(match[2], 10) : false;
},
isBlankString: function(str) {
return !str || /^\s*$/.test(str);
},
escapeRegExChars: function(str) {
return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
},
isString: function(obj) {
return typeof obj === "string";
},
isNumber: function(obj) {
return typeof obj === "number";
},
isArray: $.isArray,
isFunction: $.isFunction,
isObject: $.isPlainObject,
isUndefined: function(obj) {
return typeof obj === "undefined";
},
bind: $.proxy,
bindAll: function(obj) {
var val;
for (var key in obj) {
$.isFunction(val = obj[key]) && (obj[key] = $.proxy(val, obj));
}
},
indexOf: function(haystack, needle) {
for (var i = 0; i < haystack.length; i++) {
if (haystack[i] === needle) {
return i;
}
}
return -1;
},
each: $.each,
map: $.map,
filter: $.grep,
every: function(obj, test) {
var result = true;
if (!obj) {
return result;
}
$.each(obj, function(key, val) {
if (!(result = test.call(null, val, key, obj))) {
return false;
}
});
return !!result;
},
some: function(obj, test) {
var result = false;
if (!obj) {
return result;
}
$.each(obj, function(key, val) {
if (result = test.call(null, val, key, obj)) {
return false;
}
});
return !!result;
},
mixin: $.extend,
getUniqueId: function() {
var counter = 0;
return function() {
return counter++;
};
}(),
defer: function(fn) {
setTimeout(fn, 0);
},
debounce: function(func, wait, immediate) {
var timeout, result;
return function() {
var context = this, args = arguments, later, callNow;
later = function() {
timeout = null;
if (!immediate) {
result = func.apply(context, args);
}
};
callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) {
result = func.apply(context, args);
}
return result;
};
},
throttle: function(func, wait) {
var context, args, timeout, result, previous, later;
previous = 0;
later = function() {
previous = new Date();
timeout = null;
result = func.apply(context, args);
};
return function() {
var now = new Date(), remaining = wait - (now - previous);
context = this;
args = arguments;
if (remaining <= 0) {
clearTimeout(timeout);
timeout = null;
previous = now;
result = func.apply(context, args);
} else if (!timeout) {
timeout = setTimeout(later, remaining);
}
return result;
};
},
tokenizeQuery: function(str) {
return $.trim(str).toLowerCase().split(/[\s]+/);
},
tokenizeText: function(str) {
return $.trim(str).toLowerCase().split(/[\s\-_]+/);
},
getProtocol: function() {
return location.protocol;
},
noop: function() {}
};
var EventTarget = function() {
var eventSplitter = /\s+/;
return {
on: function(events, callback) {
var event;
if (!callback) {
return this;
}
this._callbacks = this._callbacks || {};
events = events.split(eventSplitter);
while (event = events.shift()) {
this._callbacks[event] = this._callbacks[event] || [];
this._callbacks[event].push(callback);
}
return this;
},
trigger: function(events, data) {
var event, callbacks;
if (!this._callbacks) {
return this;
}
events = events.split(eventSplitter);
while (event = events.shift()) {
if (callbacks = this._callbacks[event]) {
for (var i = 0; i < callbacks.length; i += 1) {
callbacks[i].call(this, {
type: event,
data: data
});
}
}
}
return this;
}
};
}();
var EventBus = function() {
var namespace = "typeahead:";
function EventBus(o) {
if (!o || !o.el) {
$.error("EventBus initialized without el");
}
this.$el = $(o.el);
}
utils.mixin(EventBus.prototype, {
trigger: function(type) {
var args = [].slice.call(arguments, 1);
this.$el.trigger(namespace + type, args);
}
});
return EventBus;
}();
var PersistentStorage = function() {
var ls, methods;
try {
ls = window.localStorage;
ls.setItem("~~~", "!");
ls.removeItem("~~~");
} catch (err) {
ls = null;
}
function PersistentStorage(namespace) {
this.prefix = [ "__", namespace, "__" ].join("");
this.ttlKey = "__ttl__";
this.keyMatcher = new RegExp("^" + this.prefix);
}
if (ls && window.JSON) {
methods = {
_prefix: function(key) {
return this.prefix + key;
},
_ttlKey: function(key) {
return this._prefix(key) + this.ttlKey;
},
get: function(key) {
if (this.isExpired(key)) {
this.remove(key);
}
return decode(ls.getItem(this._prefix(key)));
},
set: function(key, val, ttl) {
if (utils.isNumber(ttl)) {
ls.setItem(this._ttlKey(key), encode(now() + ttl));
} else {
ls.removeItem(this._ttlKey(key));
}
return ls.setItem(this._prefix(key), encode(val));
},
remove: function(key) {
ls.removeItem(this._ttlKey(key));
ls.removeItem(this._prefix(key));
return this;
},
clear: function() {
var i, key, keys = [], len = ls.length;
for (i = 0; i < len; i++) {
if ((key = ls.key(i)).match(this.keyMatcher)) {
keys.push(key.replace(this.keyMatcher, ""));
}
}
for (i = keys.length; i--; ) {
this.remove(keys[i]);
}
return this;
},
isExpired: function(key) {
var ttl = decode(ls.getItem(this._ttlKey(key)));
return utils.isNumber(ttl) && now() > ttl ? true : false;
}
};
} else {
methods = {
get: utils.noop,
set: utils.noop,
remove: utils.noop,
clear: utils.noop,
isExpired: utils.noop
};
}
utils.mixin(PersistentStorage.prototype, methods);
return PersistentStorage;
function now() {
return new Date().getTime();
}
function encode(val) {
return JSON.stringify(utils.isUndefined(val) ? null : val);
}
function decode(val) {
return JSON.parse(val);
}
}();
var RequestCache = function() {
function RequestCache(o) {
utils.bindAll(this);
o = o || {};
this.sizeLimit = o.sizeLimit || 10;
this.cache = {};
this.cachedKeysByAge = [];
}
utils.mixin(RequestCache.prototype, {
get: function(url) {
return this.cache[url];
},
set: function(url, resp) {
var requestToEvict;
if (this.cachedKeysByAge.length === this.sizeLimit) {
requestToEvict = this.cachedKeysByAge.shift();
delete this.cache[requestToEvict];
}
this.cache[url] = resp;
this.cachedKeysByAge.push(url);
}
});
return RequestCache;
}();
var Transport = function() {
var pendingRequestsCount = 0, pendingRequests = {}, maxPendingRequests, requestCache;
function Transport(o) {
utils.bindAll(this);
o = utils.isString(o) ? {
url: o
} : o;
requestCache = requestCache || new RequestCache();
maxPendingRequests = utils.isNumber(o.maxParallelRequests) ? o.maxParallelRequests : maxPendingRequests || 6;
this.url = o.url;
this.wildcard = o.wildcard || "%QUERY";
this.filter = o.filter;
this.replace = o.replace;
this.ajaxSettings = {
type: "get",
cache: o.cache,
timeout: o.timeout,
dataType: o.dataType || "json",
beforeSend: o.beforeSend
};
this._get = (/^throttle$/i.test(o.rateLimitFn) ? utils.throttle : utils.debounce)(this._get, o.rateLimitWait || 300);
}
utils.mixin(Transport.prototype, {
_get: function(url, cb) {
var that = this;
if (belowPendingRequestsThreshold()) {
this._sendRequest(url).done(done);
} else {
this.onDeckRequestArgs = [].slice.call(arguments, 0);
}
function done(resp) {
var data = that.filter ? that.filter(resp) : resp;
cb && cb(data);
requestCache.set(url, resp);
}
},
_sendRequest: function(url) {
var that = this, jqXhr = pendingRequests[url];
if (!jqXhr) {
incrementPendingRequests();
jqXhr = pendingRequests[url] = $.ajax(url, this.ajaxSettings).always(always);
}
return jqXhr;
function always() {
decrementPendingRequests();
pendingRequests[url] = null;
if (that.onDeckRequestArgs) {
that._get.apply(that, that.onDeckRequestArgs);
that.onDeckRequestArgs = null;
}
}
},
get: function(query, cb) {
var that = this, encodedQuery = encodeURIComponent(query || ""), url, resp;
cb = cb || utils.noop;
url = this.replace ? this.replace(this.url, encodedQuery) : this.url.replace(this.wildcard, encodedQuery);
if (resp = requestCache.get(url)) {
utils.defer(function() {
cb(that.filter ? that.filter(resp) : resp);
});
} else {
this._get(url, cb);
}
return !!resp;
}
});
return Transport;
function incrementPendingRequests() {
pendingRequestsCount++;
}
function decrementPendingRequests() {
pendingRequestsCount--;
}
function belowPendingRequestsThreshold() {
return pendingRequestsCount < maxPendingRequests;
}
}();
var Dataset = function() {
var keys = {
thumbprint: "thumbprint",
protocol: "protocol",
itemHash: "itemHash",
adjacencyList: "adjacencyList"
};
function Dataset(o) {
utils.bindAll(this);
if (utils.isString(o.template) && !o.engine) {
$.error("no template engine specified");
}
if (!o.local && !o.prefetch && !o.remote) {
$.error("one of local, prefetch, or remote is required");
}
this.name = o.name || utils.getUniqueId();
this.limit = o.limit || 5;
this.minLength = o.minLength || 1;
this.header = o.header;
this.footer = o.footer;
this.valueKey = o.valueKey || "value";
this.template = compileTemplate(o.template, o.engine, this.valueKey);
this.local = o.local;
this.prefetch = o.prefetch;
this.remote = o.remote;
this.itemHash = {};
this.adjacencyList = {};
this.storage = o.name ? new PersistentStorage(o.name) : null;
}
utils.mixin(Dataset.prototype, {
_processLocalData: function(data) {
this._mergeProcessedData(this._processData(data));
},
_loadPrefetchData: function(o) {
var that = this, thumbprint = VERSION + (o.thumbprint || ""), storedThumbprint, storedProtocol, storedItemHash, storedAdjacencyList, isExpired, deferred;
if (this.storage) {
storedThumbprint = this.storage.get(keys.thumbprint);
storedProtocol = this.storage.get(keys.protocol);
storedItemHash = this.storage.get(keys.itemHash);
storedAdjacencyList = this.storage.get(keys.adjacencyList);
}
isExpired = storedThumbprint !== thumbprint || storedProtocol !== utils.getProtocol();
o = utils.isString(o) ? {
url: o
} : o;
o.ttl = utils.isNumber(o.ttl) ? o.ttl : 24 * 60 * 60 * 1e3;
if (storedItemHash && storedAdjacencyList && !isExpired) {
this._mergeProcessedData({
itemHash: storedItemHash,
adjacencyList: storedAdjacencyList
});
deferred = $.Deferred().resolve();
} else {
deferred = $.getJSON(o.url).done(processPrefetchData);
}
return deferred;
function processPrefetchData(data) {
var filteredData = o.filter ? o.filter(data) : data, processedData = that._processData(filteredData), itemHash = processedData.itemHash, adjacencyList = processedData.adjacencyList;
if (that.storage) {
that.storage.set(keys.itemHash, itemHash, o.ttl);
that.storage.set(keys.adjacencyList, adjacencyList, o.ttl);
that.storage.set(keys.thumbprint, thumbprint, o.ttl);
that.storage.set(keys.protocol, utils.getProtocol(), o.ttl);
}
that._mergeProcessedData(processedData);
}
},
_transformDatum: function(datum) {
var value = utils.isString(datum) ? datum : datum[this.valueKey], tokens = datum.tokens || utils.tokenizeText(value), item = {
value: value,
tokens: tokens
};
if (utils.isString(datum)) {
item.datum = {};
item.datum[this.valueKey] = datum;
} else {
item.datum = datum;
}
item.tokens = utils.filter(item.tokens, function(token) {
return !utils.isBlankString(token);
});
item.tokens = utils.map(item.tokens, function(token) {
return token.toLowerCase();
});
return item;
},
_processData: function(data) {
var that = this, itemHash = {}, adjacencyList = {};
utils.each(data, function(i, datum) {
var item = that._transformDatum(datum), id = utils.getUniqueId(item.value);
itemHash[id] = item;
utils.each(item.tokens, function(i, token) {
var character = token.charAt(0), adjacency = adjacencyList[character] || (adjacencyList[character] = [ id ]);
!~utils.indexOf(adjacency, id) && adjacency.push(id);
});
});
return {
itemHash: itemHash,
adjacencyList: adjacencyList
};
},
_mergeProcessedData: function(processedData) {
var that = this;
utils.mixin(this.itemHash, processedData.itemHash);
utils.each(processedData.adjacencyList, function(character, adjacency) {
var masterAdjacency = that.adjacencyList[character];
that.adjacencyList[character] = masterAdjacency ? masterAdjacency.concat(adjacency) : adjacency;
});
},
_getLocalSuggestions: function(terms) {
var that = this, firstChars = [], lists = [], shortestList, suggestions = [];
utils.each(terms, function(i, term) {
var firstChar = term.charAt(0);
!~utils.indexOf(firstChars, firstChar) && firstChars.push(firstChar);
});
utils.each(firstChars, function(i, firstChar) {
var list = that.adjacencyList[firstChar];
if (!list) {
return false;
}
lists.push(list);
if (!shortestList || list.length < shortestList.length) {
shortestList = list;
}
});
if (lists.length < firstChars.length) {
return [];
}
utils.each(shortestList, function(i, id) {
var item = that.itemHash[id], isCandidate, isMatch;
isCandidate = utils.every(lists, function(list) {
return ~utils.indexOf(list, id);
});
isMatch = isCandidate && utils.every(terms, function(term) {
return utils.some(item.tokens, function(token) {
return token.indexOf(term) === 0;
});
});
isMatch && suggestions.push(item);
});
return suggestions;
},
initialize: function() {
var deferred;
this.local && this._processLocalData(this.local);
this.transport = this.remote ? new Transport(this.remote) : null;
deferred = this.prefetch ? this._loadPrefetchData(this.prefetch) : $.Deferred().resolve();
this.local = this.prefetch = this.remote = null;
this.initialize = function() {
return deferred;
};
return deferred;
},
getSuggestions: function(query, cb) {
var that = this, terms, suggestions, cacheHit = false;
if (query.length < this.minLength) {
return;
}
terms = utils.tokenizeQuery(query);
suggestions = this._getLocalSuggestions(terms).slice(0, this.limit);
if (suggestions.length < this.limit && this.transport) {
cacheHit = this.transport.get(query, processRemoteData);
}
!cacheHit && cb && cb(suggestions);
function processRemoteData(data) {
suggestions = suggestions.slice(0);
utils.each(data, function(i, datum) {
var item = that._transformDatum(datum), isDuplicate;
isDuplicate = utils.some(suggestions, function(suggestion) {
return item.value === suggestion.value;
});
!isDuplicate && suggestions.push(item);
return suggestions.length < that.limit;
});
cb && cb(suggestions);
}
}
});
return Dataset;
function compileTemplate(template, engine, valueKey) {
var renderFn, compiledTemplate;
if (utils.isFunction(template)) {
renderFn = template;
} else if (utils.isString(template)) {
compiledTemplate = engine.compile(template);
renderFn = utils.bind(compiledTemplate.render, compiledTemplate);
} else {
renderFn = function(context) {
return "<p>" + context[valueKey] + "</p>";
};
}
return renderFn;
}
}();
var InputView = function() {
function InputView(o) {
var that = this;
utils.bindAll(this);
this.specialKeyCodeMap = {
9: "tab",
27: "esc",
37: "left",
39: "right",
13: "enter",
38: "up",
40: "down"
};
this.$hint = $(o.hint);
this.$input = $(o.input).on("blur.tt", this._handleBlur).on("focus.tt", this._handleFocus).on("keydown.tt", this._handleSpecialKeyEvent);
if (!utils.isMsie()) {
this.$input.on("input.tt", this._compareQueryToInputValue);
} else {
this.$input.on("keydown.tt keypress.tt cut.tt paste.tt", function($e) {
if (that.specialKeyCodeMap[$e.which || $e.keyCode]) {
return;
}
utils.defer(that._compareQueryToInputValue);
});
}
this.query = this.$input.val();
this.$overflowHelper = buildOverflowHelper(this.$input);
}
utils.mixin(InputView.prototype, EventTarget, {
_handleFocus: function() {
this.trigger("focused");
},
_handleBlur: function() {
this.trigger("blured");
},
_handleSpecialKeyEvent: function($e) {
var keyName = this.specialKeyCodeMap[$e.which || $e.keyCode];
keyName && this.trigger(keyName + "Keyed", $e);
},
_compareQueryToInputValue: function() {
var inputValue = this.getInputValue(), isSameQuery = compareQueries(this.query, inputValue), isSameQueryExceptWhitespace = isSameQuery ? this.query.length !== inputValue.length : false;
if (isSameQueryExceptWhitespace) {
this.trigger("whitespaceChanged", {
value: this.query
});
} else if (!isSameQuery) {
this.trigger("queryChanged", {
value: this.query = inputValue
});
}
},
destroy: function() {
this.$hint.off(".tt");
this.$input.off(".tt");
this.$hint = this.$input = this.$overflowHelper = null;
},
focus: function() {
this.$input.focus();
},
blur: function() {
this.$input.blur();
},
getQuery: function() {
return this.query;
},
setQuery: function(query) {
this.query = query;
},
getInputValue: function() {
return this.$input.val();
},
setInputValue: function(value, silent) {
this.$input.val(value);
!silent && this._compareQueryToInputValue();
},
getHintValue: function() {
return this.$hint.val();
},
setHintValue: function(value) {
this.$hint.val(value);
},
getLanguageDirection: function() {
return (this.$input.css("direction") || "ltr").toLowerCase();
},
isOverflow: function() {
this.$overflowHelper.text(this.getInputValue());
return this.$overflowHelper.width() > this.$input.width();
},
isCursorAtEnd: function() {
var valueLength = this.$input.val().length, selectionStart = this.$input[0].selectionStart, range;
if (utils.isNumber(selectionStart)) {
return selectionStart === valueLength;
} else if (document.selection) {
range = document.selection.createRange();
range.moveStart("character", -valueLength);
return valueLength === range.text.length;
}
return true;
}
});
return InputView;
function buildOverflowHelper($input) {
return $("<span></span>").css({
position: "absolute",
left: "-9999px",
visibility: "hidden",
whiteSpace: "nowrap",
fontFamily: $input.css("font-family"),
fontSize: $input.css("font-size"),
fontStyle: $input.css("font-style"),
fontVariant: $input.css("font-variant"),
fontWeight: $input.css("font-weight"),
wordSpacing: $input.css("word-spacing"),
letterSpacing: $input.css("letter-spacing"),
textIndent: $input.css("text-indent"),
textRendering: $input.css("text-rendering"),
textTransform: $input.css("text-transform")
}).insertAfter($input);
}
function compareQueries(a, b) {
a = (a || "").replace(/^\s*/g, "").replace(/\s{2,}/g, " ");
b = (b || "").replace(/^\s*/g, "").replace(/\s{2,}/g, " ");
return a === b;
}
}();
var DropdownView = function() {
var html = {
suggestionsList: '<span class="tt-suggestions"></span>'
}, css = {
suggestionsList: {
display: "block"
},
suggestion: {
whiteSpace: "nowrap",
cursor: "pointer"
},
suggestionChild: {
whiteSpace: "normal"
}
};
function DropdownView(o) {
utils.bindAll(this);
this.isOpen = false;
this.isEmpty = true;
this.isMouseOverDropdown = false;
this.$menu = $(o.menu).on("mouseenter.tt", this._handleMouseenter).on("mouseleave.tt", this._handleMouseleave).on("click.tt", ".tt-suggestion", this._handleSelection).on("mouseover.tt", ".tt-suggestion", this._handleMouseover);
}
utils.mixin(DropdownView.prototype, EventTarget, {
_handleMouseenter: function() {
this.isMouseOverDropdown = true;
},
_handleMouseleave: function() {
this.isMouseOverDropdown = false;
},
_handleMouseover: function($e) {
var $suggestion = $($e.currentTarget);
this._getSuggestions().removeClass("tt-is-under-cursor");
$suggestion.addClass("tt-is-under-cursor");
},
_handleSelection: function($e) {
var $suggestion = $($e.currentTarget);
this.trigger("suggestionSelected", extractSuggestion($suggestion));
},
_show: function() {
this.$menu.css("display", "block");
},
_hide: function() {
this.$menu.hide();
},
_moveCursor: function(increment) {
var $suggestions, $cur, nextIndex, $underCursor;
if (!this.isVisible()) {
return;
}
$suggestions = this._getSuggestions();
$cur = $suggestions.filter(".tt-is-under-cursor");
$cur.removeClass("tt-is-under-cursor");
nextIndex = $suggestions.index($cur) + increment;
nextIndex = (nextIndex + 1) % ($suggestions.length + 1) - 1;
if (nextIndex === -1) {
this.trigger("cursorRemoved");
return;
} else if (nextIndex < -1) {
nextIndex = $suggestions.length - 1;
}
$underCursor = $suggestions.eq(nextIndex).addClass("tt-is-under-cursor");
this._ensureVisibility($underCursor);
this.trigger("cursorMoved", extractSuggestion($underCursor));
},
_getSuggestions: function() {
return this.$menu.find(".tt-suggestions > .tt-suggestion");
},
_ensureVisibility: function($el) {
var menuHeight = this.$menu.height() + parseInt(this.$menu.css("paddingTop"), 10) + parseInt(this.$menu.css("paddingBottom"), 10), menuScrollTop = this.$menu.scrollTop(), elTop = $el.position().top, elBottom = elTop + $el.outerHeight(true);
if (elTop < 0) {
this.$menu.scrollTop(menuScrollTop + elTop);
} else if (menuHeight < elBottom) {
this.$menu.scrollTop(menuScrollTop + (elBottom - menuHeight));
}
},
destroy: function() {
this.$menu.off(".tt");
this.$menu = null;
},
isVisible: function() {
return this.isOpen && !this.isEmpty;
},
closeUnlessMouseIsOverDropdown: function() {
if (!this.isMouseOverDropdown) {
this.close();
}
},
close: function() {
if (this.isOpen) {
this.isOpen = false;
this.isMouseOverDropdown = false;
this._hide();
this.$menu.find(".tt-suggestions > .tt-suggestion").removeClass("tt-is-under-cursor");
this.trigger("closed");
}
},
open: function() {
if (!this.isOpen) {
this.isOpen = true;
!this.isEmpty && this._show();
this.trigger("opened");
}
},
setLanguageDirection: function(dir) {
var ltrCss = {
left: "0",
right: "auto"
}, rtlCss = {
left: "auto",
right: " 0"
};
dir === "ltr" ? this.$menu.css(ltrCss) : this.$menu.css(rtlCss);
},
moveCursorUp: function() {
this._moveCursor(-1);
},
moveCursorDown: function() {
this._moveCursor(+1);
},
getSuggestionUnderCursor: function() {
var $suggestion = this._getSuggestions().filter(".tt-is-under-cursor").first();
return $suggestion.length > 0 ? extractSuggestion($suggestion) : null;
},
getFirstSuggestion: function() {
var $suggestion = this._getSuggestions().first();
return $suggestion.length > 0 ? extractSuggestion($suggestion) : null;
},
renderSuggestions: function(dataset, suggestions) {
var datasetClassName = "tt-dataset-" + dataset.name, wrapper = '<div class="tt-suggestion">%body</div>', compiledHtml, $suggestionsList, $dataset = this.$menu.find("." + datasetClassName), elBuilder, fragment, $el;
if ($dataset.length === 0) {
$suggestionsList = $(html.suggestionsList).css(css.suggestionsList);
$dataset = $("<div></div>").addClass(datasetClassName).append(dataset.header).append($suggestionsList).append(dataset.footer).appendTo(this.$menu);
}
if (suggestions.length > 0) {
this.isEmpty = false;
this.isOpen && this._show();
elBuilder = document.createElement("div");
fragment = document.createDocumentFragment();
utils.each(suggestions, function(i, suggestion) {
suggestion.dataset = dataset.name;
compiledHtml = dataset.template(suggestion.datum);
elBuilder.innerHTML = wrapper.replace("%body", compiledHtml);
$el = $(elBuilder.firstChild).css(css.suggestion).data("suggestion", suggestion);
$el.children().each(function() {
$(this).css(css.suggestionChild);
});
fragment.appendChild($el[0]);
});
$dataset.show().find(".tt-suggestions").html(fragment);
} else {
this.clearSuggestions(dataset.name);
}
this.trigger("suggestionsRendered");
},
clearSuggestions: function(datasetName) {
var $datasets = datasetName ? this.$menu.find(".tt-dataset-" + datasetName) : this.$menu.find('[class^="tt-dataset-"]'), $suggestions = $datasets.find(".tt-suggestions");
$datasets.hide();
$suggestions.empty();
if (this._getSuggestions().length === 0) {
this.isEmpty = true;
this._hide();
}
}
});
return DropdownView;
function extractSuggestion($el) {
return $el.data("suggestion");
}
}();
var TypeaheadView = function() {
var html = {
wrapper: '<span class="twitter-typeahead"></span>',
hint: '<input class="tt-hint" type="text" autocomplete="off" spellcheck="off" disabled>',
dropdown: '<span class="tt-dropdown-menu"></span>'
}, css = {
wrapper: {
position: "relative",
display: "inline-block"
},
hint: {
position: "absolute",
top: "0",
left: "0",
borderColor: "transparent",
boxShadow: "none"
},
query: {
position: "relative",
verticalAlign: "top",
backgroundColor: "transparent"
},
dropdown: {
position: "absolute",
top: "100%",
left: "0",
zIndex: "100",
display: "none"
}
};
if (utils.isMsie()) {
utils.mixin(css.query, {
backgroundImage: "url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)"
});
}
if (utils.isMsie() && utils.isMsie() <= 7) {
utils.mixin(css.wrapper, {
display: "inline",
zoom: "1"
});
utils.mixin(css.query, {
marginTop: "-1px"
});
}
function TypeaheadView(o) {
var $menu, $input, $hint;
utils.bindAll(this);
this.$node = buildDomStructure(o.input);
this.datasets = o.datasets;
this.dir = null;
this.eventBus = o.eventBus;
$menu = this.$node.find(".tt-dropdown-menu");
$input = this.$node.find(".tt-query");
$hint = this.$node.find(".tt-hint");
this.dropdownView = new DropdownView({
menu: $menu
}).on("suggestionSelected", this._handleSelection).on("cursorMoved", this._clearHint).on("cursorMoved", this._setInputValueToSuggestionUnderCursor).on("cursorRemoved", this._setInputValueToQuery).on("cursorRemoved", this._updateHint).on("suggestionsRendered", this._updateHint).on("opened", this._updateHint).on("closed", this._clearHint).on("opened closed", this._propagateEvent);
this.inputView = new InputView({
input: $input,
hint: $hint
}).on("focused", this._openDropdown).on("blured", this._closeDropdown).on("blured", this._setInputValueToQuery).on("enterKeyed tabKeyed", this._handleSelection).on("queryChanged", this._clearHint).on("queryChanged", this._clearSuggestions).on("queryChanged", this._getSuggestions).on("whitespaceChanged", this._updateHint).on("queryChanged whitespaceChanged", this._openDropdown).on("queryChanged whitespaceChanged", this._setLanguageDirection).on("escKeyed", this._closeDropdown).on("escKeyed", this._setInputValueToQuery).on("tabKeyed upKeyed downKeyed", this._managePreventDefault).on("upKeyed downKeyed", this._moveDropdownCursor).on("upKeyed downKeyed", this._openDropdown).on("tabKeyed leftKeyed rightKeyed", this._autocomplete);
}
utils.mixin(TypeaheadView.prototype, EventTarget, {
_managePreventDefault: function(e) {
var $e = e.data, hint, inputValue, preventDefault = false;
switch (e.type) {
case "tabKeyed":
hint = this.inputView.getHintValue();
inputValue = this.inputView.getInputValue();
preventDefault = hint && hint !== inputValue;
break;
case "upKeyed":
case "downKeyed":
preventDefault = !$e.shiftKey && !$e.ctrlKey && !$e.metaKey;
break;
}
preventDefault && $e.preventDefault();
},
_setLanguageDirection: function() {
var dir = this.inputView.getLanguageDirection();
if (dir !== this.dir) {
this.dir = dir;
this.$node.css("direction", dir);
this.dropdownView.setLanguageDirection(dir);
}
},
_updateHint: function() {
var suggestion = this.dropdownView.getFirstSuggestion(), hint = suggestion ? suggestion.value : null, dropdownIsVisible = this.dropdownView.isVisible(), inputHasOverflow = this.inputView.isOverflow(), inputValue, query, escapedQuery, beginsWithQuery, match;
if (hint && dropdownIsVisible && !inputHasOverflow) {
inputValue = this.inputView.getInputValue();
query = inputValue.replace(/\s{2,}/g, " ").replace(/^\s+/g, "");
escapedQuery = utils.escapeRegExChars(query);
beginsWithQuery = new RegExp("^(?:" + escapedQuery + ")(.*$)", "i");
match = beginsWithQuery.exec(hint);
this.inputView.setHintValue(inputValue + (match ? match[1] : ""));
}
},
_clearHint: function() {
this.inputView.setHintValue("");
},
_clearSuggestions: function() {
this.dropdownView.clearSuggestions();
},
_setInputValueToQuery: function() {
this.inputView.setInputValue(this.inputView.getQuery());
},
_setInputValueToSuggestionUnderCursor: function(e) {
var suggestion = e.data;
this.inputView.setInputValue(suggestion.value, true);
},
_openDropdown: function() {
this.dropdownView.open();
},
_closeDropdown: function(e) {
this.dropdownView[e.type === "blured" ? "closeUnlessMouseIsOverDropdown" : "close"]();
},
_moveDropdownCursor: function(e) {
var $e = e.data;
if (!$e.shiftKey && !$e.ctrlKey && !$e.metaKey) {
this.dropdownView[e.type === "upKeyed" ? "moveCursorUp" : "moveCursorDown"]();
}
},
_handleSelection: function(e) {
var byClick = e.type === "suggestionSelected", suggestion = byClick ? e.data : this.dropdownView.getSuggestionUnderCursor();
if (suggestion) {
this.inputView.setInputValue(suggestion.value);
byClick ? this.inputView.focus() : e.data.preventDefault();
byClick && utils.isMsie() ? utils.defer(this.dropdownView.close) : this.dropdownView.close();
this.eventBus.trigger("selected", suggestion.datum, suggestion.dataset);
}
},
_getSuggestions: function() {
var that = this, query = this.inputView.getQuery();
if (utils.isBlankString(query)) {
return;
}
utils.each(this.datasets, function(i, dataset) {
dataset.getSuggestions(query, function(suggestions) {
if (query === that.inputView.getQuery()) {
that.dropdownView.renderSuggestions(dataset, suggestions);
}
});
});