我正在使用带有 Jquery Auto-Complete 的 FoxyComplete 插件来进行简单的搜索。一切都已设置好并且运行良好，但我发现搜索结果非常有限。
我对我的所有数据都使用了一个大的 JSON 文件，我遇到的问题是在以下情况下：假设我的 JSON 文件具有以下描述：
{
"title": "Brand new black car"
},
如果用户搜索“ black car”，他或她将得到完美的结果，并且搜索很棒。但是，如果用户搜索“ car new”，即使两个关键字都在我的 JSON 文件中，也不会出现任何内容。
任何帮助都会很棒。我翻阅了 Jquery AutoComplete 文档，也找不到解决方案。我的 Jquery 自动完成 js 如下：
;
(function ($) {
$.fn.extend({
autocomplete: function (urlOrData, options) {
var isUrl = typeof urlOrData == "string";
options = $.extend({}, $.Autocompleter.defaults, {
url: isUrl ? urlOrData : null,
data: isUrl ? null : urlOrData,
delay: isUrl ? $.Autocompleter.defaults.delay : 10,
max: options && !options.scroll ? 10 : 150
}, options);
// if highlight is set to false, replace it with a do-nothing function
options.highlight = options.highlight || function (value) {
return value;
};
// if the formatMatch option is not specified, then use formatItem for backwards compatibility
options.formatMatch = options.formatMatch || options.formatItem;
return this.each(function () {
new $.Autocompleter(this, options);
});
},
result: function (handler) {
return this.bind("result", handler);
},
search: function (handler) {
return this.trigger("search", [handler]);
},
flushCache: function () {
return this.trigger("flushCache");
},
setOptions: function (options) {
return this.trigger("setOptions", [options]);
},
unautocomplete: function () {
return this.trigger("unautocomplete");
}
});
$.Autocompleter = function (input, options) {
var KEY = {
UP: 38,
DOWN: 40,
DEL: 46,
TAB: 9,
RETURN: 13,
ESC: 27,
COMMA: 188,
PAGEUP: 33,
PAGEDOWN: 34,
BACKSPACE: 8
};
// Create $ object for input element
var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);
var timeout;
var previousValue = "";
var cache = $.Autocompleter.Cache(options);
var hasFocus = 0;
var lastKeyPressCode;
var config = {
mouseDownOnSelect: false
};
var select = $.Autocompleter.Select(options, input, selectCurrent, config);
var blockSubmit;
// prevent form submit in opera when selecting with return key
$.browser.opera && $(input.form).bind("submit.autocomplete", function () {
if (blockSubmit) {
blockSubmit = false;
return false;
}
});
// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function (event) {
// a keypress means the input has focus
// avoids issue where input had focus before the autocomplete was applied
hasFocus = 1;
// track last key pressed
lastKeyPressCode = event.keyCode;
switch (event.keyCode) {
case KEY.UP:
event.preventDefault();
if (select.visible()) {
select.prev();
} else {
onChange(0, true);
}
break;
case KEY.DOWN:
event.preventDefault();
if (select.visible()) {
select.next();
} else {
onChange(0, true);
}
break;
case KEY.PAGEUP:
event.preventDefault();
if (select.visible()) {
select.pageUp();
} else {
onChange(0, true);
}
break;
case KEY.PAGEDOWN:
event.preventDefault();
if (select.visible()) {
select.pageDown();
} else {
onChange(0, true);
}
break;
// matches also semicolon
case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
case KEY.TAB:
case KEY.RETURN:
if (selectCurrent()) {
// stop default to prevent a form submit, Opera needs special handling
event.preventDefault();
blockSubmit = true;
return false;
}
break;
case KEY.ESC:
select.hide();
break;
default:
clearTimeout(timeout);
timeout = setTimeout(onChange, options.delay);
break;
}
}).focus(function () {
// track whether the field has focus, we shouldn't process any
// results if the field no longer has focus
hasFocus++;
}).blur(function () {
hasFocus = 0;
if (!config.mouseDownOnSelect) {
hideResults();
}
}).click(function () {
// show select when clicking in a focused field
if (hasFocus++ > 1 && !select.visible()) {
onChange(0, true);
}
}).bind("search", function () {
// TODO why not just specifying both arguments?
var fn = (arguments.length > 1) ? arguments[1] : null;
function findValueCallback(q, data) {
var result;
if (data && data.length) {
for (var i = 0; i < data.length; i++) {
if (data[i].result.toLowerCase() == q.toLowerCase()) {
result = data[i];
break;
}
}
}
if (typeof fn == "function") fn(result);
else $input.trigger("result", result && [result.data, result.value]);
}
$.each(trimWords($input.val()), function (i, value) {
request(value, findValueCallback, findValueCallback);
});
}).bind("flushCache", function () {
cache.flush();
}).bind("setOptions", function () {
$.extend(options, arguments[1]);
// if we've updated the data, repopulate
if ("data" in arguments[1]) cache.populate();
}).bind("unautocomplete", function () {
select.unbind();
$input.unbind();
$(input.form).unbind(".autocomplete");
});
function selectCurrent() {
var selected = select.selected();
if (!selected) return false;
var v = selected.result;
previousValue = v;
if (options.multiple) {
var words = trimWords($input.val());
if (words.length > 1) {
var seperator = options.multipleSeparator.length;
var cursorAt = $(input).selection().start;
var wordAt, progress = 0;
$.each(words, function (i, word) {
progress += word.length;
if (cursorAt <= progress) {
wordAt = i;
return false;
}
progress += seperator;
});
words[wordAt] = v;
// TODO this should set the cursor to the right position, but it gets overriden somewhere
//$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
v = words.join(options.multipleSeparator);
}
v += options.multipleSeparator;
}
$input.val(v);
hideResultsNow();
$input.trigger("result", [selected.data, selected.value]);
return true;
}
function onChange(crap, skipPrevCheck) {
if (lastKeyPressCode == KEY.DEL) {
select.hide();
return;
}
var currentValue = $input.val();
if (!skipPrevCheck && currentValue == previousValue) return;
previousValue = currentValue;
currentValue = lastWord(currentValue);
if (currentValue.length >= options.minChars) {
$input.addClass(options.loadingClass);
if (!options.matchCase) currentValue = currentValue.toLowerCase();
request(currentValue, receiveData, hideResultsNow);
} else {
stopLoading();
select.hide();
}
};
function trimWords(value) {
if (!value) return [""];
if (!options.multiple) return [$.trim(value)];
return $.map(value.split(options.multipleSeparator), function (word) {
return $.trim(value).length ? $.trim(word) : null;
});
}
function lastWord(value) {
if (!options.multiple) return value;
var words = trimWords(value);
if (words.length == 1) return words[0];
var cursorAt = $(input).selection().start;
if (cursorAt == value.length) {
words = trimWords(value)
} else {
words = trimWords(value.replace(value.substring(cursorAt), ""));
}
return words[words.length - 1];
}
// fills in the input box w/the first match (assumed to be the best match)
// q: the term entered
// sValue: the first matching result
function autoFill(q, sValue) {
// autofill in the complete box w/the first match as long as the user hasn't entered in more data
// if the last user key pressed was backspace, don't autofill
if (options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE) {
// fill in the value (keep the case the user has typed)
$input.val($input.val() + sValue.substring(lastWord(previousValue).length));
// select the portion of the value not typed by the user (so the next character will erase)
$(input).selection(previousValue.length, previousValue.length + sValue.length);
}
};
function hideResults() {
clearTimeout(timeout);
timeout = setTimeout(hideResultsNow, 200);
};
function hideResultsNow() {
var wasVisible = select.visible();
select.hide();
clearTimeout(timeout);
stopLoading();
if (options.mustMatch) {
// call search and run callback
$input.search(
function (result) {
// if no value found, clear the input box
if (!result) {
if (options.multiple) {
var words = trimWords($input.val()).slice(0, - 1);
$input.val(words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : ""));
} else {
$input.val("");
$input.trigger("result", null);
}
}
});
}
};
function receiveData(q, data) {
if (data && data.length && hasFocus) {
stopLoading();
select.display(data, q);
autoFill(q, data[0].value);
select.show();
} else {
hideResultsNow();
}
};
function request(term, success, failure) {
if (!options.matchCase) term = term.toLowerCase();
var data = cache.load(term);
// recieve the cached data
if (data && data.length) {
success(term, data);
// if an AJAX url has been supplied, try loading the data now
} else if ((typeof options.url == "string") && (options.url.length > 0)) {
var extraParams = {
timestamp: +new Date()
};
$.each(options.extraParams, function (key, param) {
extraParams[key] = typeof param == "function" ? param() : param;
});
$.ajax({
// try to leverage ajaxQueue plugin to abort previous requests
mode: "abort",
// limit abortion to this input
port: "autocomplete" + input.name,
dataType: options.dataType,
url: options.url,
data: $.extend({
q: lastWord(term),
limit: options.max
}, extraParams),
success: function (data) {
var parsed = options.parse && options.parse(data) || parse(data);
cache.add(term, parsed);
success(term, parsed);
}
});
} else {
// if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
select.emptyList();
failure(term);
}
};
function parse(data) {
var parsed = [];
var rows = data.split("\n");
for (var i = 0; i < rows.length; i++) {
var row = $.trim(rows[i]);
if (row) {
row = row.split("|");
parsed[parsed.length] = {
data: row,
value: row[0],
result: options.formatResult && options.formatResult(row, row[0]) || row[0]
};
}
}
return parsed;
};
function stopLoading() {
$input.removeClass(options.loadingClass);
};
};
$.Autocompleter.defaults = {
inputClass: "ac_input",
resultsClass: "ac_results",
loadingClass: "ac_loading",
minChars: 1,
delay: 400,
matchCase: false,
matchSubset: true,
matchContains: false,
cacheLength: 10,
max: 100,
mustMatch: false,
extraParams: {},
selectFirst: true,
formatItem: function (row) {
return row[0];
},
formatMatch: null,
autoFill: false,
width: 0,
multiple: false,
multipleSeparator: ", ",
highlight: function (value, term) {
return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
},
scroll: true,
scrollHeight: 180
};
$.Autocompleter.Cache = function (options) {
var data = {};
var length = 0;
function matchSubset(s, sub) {
if (!options.matchCase) s = s.toLowerCase();
var i = s.indexOf(sub);
if (options.matchContains == "word") {
i = s.toLowerCase().search("\\b" + sub.toLowerCase());
}
if (i == -1) return false;
return i == 0 || options.matchContains;
};
function add(q, value) {
if (length > options.cacheLength) {
flush();
}
if (!data[q]) {
length++;
}
data[q] = value;
}
function populate() {
if (!options.data) return false;
// track the matches
var stMatchSets = {},
nullData = 0;
// no url was specified, we need to adjust the cache length to make sure it fits the local data store
if (!options.url) options.cacheLength = 1;
// track all options for minChars = 0
stMatchSets[""] = [];
// loop through the array and create a lookup structure
for (var i = 0, ol = options.data.length; i < ol; i++) {
var rawValue = options.data[i];
// if rawValue is a string, make an array otherwise just reference the array
rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;
var value = options.formatMatch(rawValue, i + 1, options.data.length);
if (value === false) continue;
var firstChar = value.charAt(0).toLowerCase();
// if no lookup array for this character exists, look it up now
if (!stMatchSets[firstChar]) stMatchSets[firstChar] = [];
// if the match is a string
var row = {
value: value,
data: rawValue,
result: options.formatResult && options.formatResult(rawValue) || value
};
// push the current match into the set list
stMatchSets[firstChar].push(row);
// keep track of minChars zero items
if (nullData++ < options.max) {
stMatchSets[""].push(row);
}
};
// add the data items to the cache
$.each(stMatchSets, function (i, value) {
// increase the cache size
options.cacheLength++;
// add to the cache
add(i, value);
});
}
// populate any existing data
setTimeout(populate, 25);
function flush() {
data = {};
length = 0;
}
return {
flush: flush,
add: add,
populate: populate,
load: function (q) {
if (!options.cacheLength || !length) return null;
/*
* if dealing w/local data and matchContains than we must make sure
* to loop through all the data collections looking for matches
*/
if (!options.url && options.matchContains) {
// track all matches
var csub = [];
// loop through all the data grids for matches
for (var k in data) {
// don't search through the stMatchSets[""] (minChars: 0) cache
// this prevents duplicates
if (k.length > 0) {
var c = data[k];
$.each(c, function (i, x) {
// if we've got a match, add it to the array
if (matchSubset(x.value, q)) {
csub.push(x);
}
});
}
}
return csub;
} else
// if the exact item exists, use it
if (data[q]) {
return data[q];
} else if (options.matchSubset) {
for (var i = q.length - 1; i >= options.minChars; i--) {
var c = data[q.substr(0, i)];
if (c) {
var csub = [];
$.each(c, function (i, x) {
if (matchSubset(x.value, q)) {
csub[csub.length] = x;
}
});
return csub;
}
}
}
return null;
}
};
};
$.Autocompleter.Select = function (options, input, select, config) {
var CLASSES = {
ACTIVE: "ac_over"
};
var listItems,
active = -1,
data,
term = "",
needsInit = true,
element,
list;
// Create results
function init() {
if (!needsInit) return;
element = $("<div/>").hide().addClass(options.resultsClass).css("position", "absolute")
//.attr('id', 'benjamin')
.appendTo(document.body);
list = $("<ul/>").appendTo(element).mouseover(function (event) {
if (target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
$(target(event)).addClass(CLASSES.ACTIVE);
}
}).click(function (event) {
$(target(event)).addClass(CLASSES.ACTIVE);
select();
// TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
input.focus();
return false;
}).mousedown(function () {
config.mouseDownOnSelect = true;
}).mouseup(function () {
config.mouseDownOnSelect = false;
});
if (options.width > 0) element.css("width", options.width);
needsInit = false;
}
function target(event) {
var element = event.target;
while (element && element.tagName != "LI")
element = element.parentNode;
// more fun with IE, sometimes event.target is empty, just ignore it then
if (!element) return [];
return element;
}
function moveSelect(step) {
listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
movePosition(step);
var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
if (options.scroll) {
var offset = 0;
listItems.slice(0, active).each(function () {
offset += this.offsetHeight;
});
if ((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
} else if (offset < list.scrollTop()) {
list.scrollTop(offset);
}
}
};
function movePosition(step) {
active += step;
if (active < 0) {
active = listItems.size() - 1;
} else if (active >= listItems.size()) {
active = 0;
}
}
function limitNumberOfItems(available) {
return options.max && options.max < available ? options.max : available;
}
function fillList() {
list.empty();
var max = limitNumberOfItems(data.length);
for (var i = 0; i < max; i++) {
if (!data[i]) continue;
var formatted = options.formatItem(data[i].data, i + 1, max, data[i].value, term);
if (formatted === false) continue;
var li = $("<li/>").html(options.highlight(formatted, term)).addClass(i % 2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
$.data(li, "ac_data", data[i]);
}
listItems = list.find("li");
if (options.selectFirst) {
listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
active = 0;
}
// apply bgiframe if available
if ($.fn.bgiframe) list.bgiframe();
}
return {
display: function (d, q) {
init();
data = d;
term = q;
fillList();
},
next: function () {
moveSelect(1);
},
prev: function () {
moveSelect(-1);
},
pageUp: function () {
if (active != 0 && active - 8 < 0) {
moveSelect(-active);
} else {
moveSelect(-8);
}
},
pageDown: function () {
if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
moveSelect(listItems.size() - 1 - active);
} else {
moveSelect(8);
}
},
hide: function () {
element && element.hide();
listItems && listItems.removeClass(CLASSES.ACTIVE);
active = -1;
},
visible: function () {
return element && element.is(":visible");
},
current: function () {
return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
},
show: function () {
var offset = $(input).offset();
element.css({
width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
top: offset.top + input.offsetHeight,
left: offset.left
}).show();
if (options.scroll) {
list.scrollTop(0);
list.css({
maxHeight: options.scrollHeight,
overflow: 'auto'
});
if ($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
var listHeight = 0;
listItems.each(function () {
listHeight += this.offsetHeight;
});
var scrollbarsVisible = listHeight > options.scrollHeight;
list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight);
if (!scrollbarsVisible) {
// IE doesn't recalculate width when scrollbar disappears
listItems.width(list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")));
}
}
}
},
selected: function () {
var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
return selected && selected.length && $.data(selected[0], "ac_data");
},
emptyList: function () {
list && list.empty();
},
unbind: function () {
element && element.remove();
}
};
};
$.fn.selection = function (start, end) {
if (start !== undefined) {
return this.each(function () {
if (this.createTextRange) {
var selRange = this.createTextRange();
if (end === undefined || start == end) {
selRange.move("character", start);
selRange.select();
} else {
selRange.collapse(true);
selRange.moveStart("character", start);
selRange.moveEnd("character", end);
selRange.select();
}
} else if (this.setSelectionRange) {
this.setSelectionRange(start, end);
} else if (this.selectionStart) {
this.selectionStart = start;
this.selectionEnd = end;
}
});
}
var field = this[0];
if (field.createTextRange) {
var range = document.selection.createRange(),
orig = field.value,
teststring = "<->",
textLength = range.text.length;
range.text = teststring;
var caretAt = field.value.indexOf(teststring);
field.value = orig;
this.selection(caretAt, caretAt + textLength);
return {
start: caretAt,
end: caretAt + textLength
}
} else if (field.selectionStart !== undefined) {
return {
start: field.selectionStart,
end: field.selectionEnd
}
}
};
})(jQuery);