/*
* 在jquery.suggest 1.1基础上针对中文输入的特点做了部分修改，下载原版请到jquery插件库
* 修改者：wangshuai
*
* 修改部分已在文中标注
*
*
* jquery.suggest 1.1 - 2007-08-06
*
* Uses code and techniques from following libraries:
* 1. http://www.dyve.net/jquery/?autocomplete
* 2. http://dev.jquery.com/browser/trunk/plugins/interface/iautocompleter.js
*
* All the new stuff written by Peter Vulgaris (www.vulgarisoip.com)
* Feel free to do whatever you want with this file
*
*/
(function($) {
$.suggest = function(input, options) {
var $input = $(input).attr("autocomplete", "off");
var $results = $(document.createElement("ul"));
var timeout = false; // hold timeout ID for suggestion results to appear
var prevLength = 0; // last recorded length of $input.val()
var cache = []; // cache MRU list
var cacheSize = 0; // size of cache in chars (bytes?)
$results.addClass(options.resultsClass).appendTo('body');
resetPosition();
$(window)
.load(resetPosition) // just in case user is changing size of page while loading
.resize(resetPosition);
$input.blur(function() {
setTimeout(function() { $results.hide() }, 200);
});
// help IE users if possible
try {
$results.bgiframe();
} catch (e) { }
// I really hate browser detection, but I don't see any other way
//修改开始
//下面部分在作者原来代码的基本上针对中文输入的特点做了些修改
if ($.browser.mozilla)
$input.keypress(processKey2); // onkeypress repeats arrow keys in Mozilla/Opera
else
$input.keydown(processKey2); // onkeydown repeats arrow keys in IE/Safari*/
//这里是自己改为keyup事件
$input.keyup(processKey);
//修改结束
function resetPosition() {
// requires jquery.dimension plugin
var offset = $input.offset();
$results.css({
top: (offset.top + input.offsetHeight) + 'px',
left: offset.left + 'px'
});
}
function processKey(e) {
// handling up/down/escape requires results to be visible
// handling enter/tab requires that AND a result to be selected
if (/^32$|^9$/.test(e.keyCode) && getCurrentResult()) {
if (e.preventDefault)
e.preventDefault();
if (e.stopPropagation)
e.stopPropagation();
e.cancelBubble = true;
e.returnValue = false;
selectCurrentResult();
} else if ($input.val().length != prevLength) {
if (timeout)
clearTimeout(timeout);
timeout = setTimeout(suggest, options.delay);
prevLength = $input.val().length;
}
}
//此处针对上面介绍的修改增加的函数
function processKey2(e) {
// handling up/down/escape requires results to be visible
// handling enter/tab requires that AND a result to be selected
if (/27$|38$|40$/.test(e.keyCode) && $results.is(':visible')) {
if (e.preventDefault)
e.preventDefault();
if (e.stopPropagation)
e.stopPropagation();
e.cancelBubble = true;
e.returnValue = false;
switch (e.keyCode) {
case 38: // up
prevResult(); z
break;
case 40: // down
nextResult();
break;
case 27: // escape
$results.hide();
break;
}
} else if ($input.val().length != prevLength) {
if (timeout)
clearTimeout(timeout);
timeout = setTimeout(suggest, options.delay);
prevLength = $input.val().length;
}
}
function suggest() {
var q = $.trim($input.val());
if (q.length >= options.minchars) {
cached = checkCache(q);
if (cached) {
displayItems(cached['items']);
} else {
var searchType = 0;
if (options.searchTypeSelect != null)
searchType = options.searchTypeSelect[0].value || 0;
$.get(options.source, { q: q, searchType: searchType }, function(txt) {
$results.hide();
var items = parseTxt(txt, q);
displayItems(items);
addToCache(q, items, txt.length);
});
}
} else {
$results.hide();
}
}
function checkCache(q) {
for (var i = 0; i < cache.length; i++)
if (cache[i]['q'] == q) {
cache.unshift(cache.splice(i, 1)[0]);
return cache[0];
}
return false;
}
function addToCache(q, items, size) {
while (cache.length && (cacheSize + size > options.maxCacheSize)) {
var cached = cache.pop();
cacheSize -= cached['size'];
}
cache.push({
q: q,
size: size,
items: items
});
cacheSize += size;
}
function displayItems(items) {
if (!items)
return;
if (!items.length) {
$results.hide();
return;
}
var html = '';
for (var i = 0; i < items.length; i++)
html += '' + items[i] + '';
$results.html(html).show();
$results
.children('li')
.mouseover(function() {
$results.children('li').removeClass(options.selectClass);
$(this).addClass(options.selectClass);
})
.click(function(e) {
e.preventDefault();
e.stopPropagation();
selectCurrentResult();
});
}
function parseTxt(txt, q) {
var items = [];
var tokens = txt.split(options.delimiter);
// parse returned data for non-empty items
for (var i = 0; i < tokens.length; i++) {
var token = $.trim(tokens[i]);
if (token) {
token = token.replace(
new RegExp(q, 'ig'),
function(q) { return '' + q + '' }
);
items[items.length] = token;
}
}
return items;
}
function getCurrentResult() {
if (!$results.is(':visible'))
return false;
var $currentResult = $results.children('li.' + options.selectClass);
if (!$currentResult.length)
$currentResult = false;
return $currentResult;
}
function selectCurrentResult() {
$currentResult = getCurrentResult();
if ($currentResult) {
$input.val($currentResult.text());
$results.hide();
if (options.onSelect)
options.onSelect.apply($input[0]);
}
}
function nextResult() {
$currentResult = getCurrentResult();
if ($currentResult)
$currentResult
.removeClass(options.selectClass)
.next()
.addClass(options.selectClass);
else
$results.children('li:first-child').addClass(options.selectClass);
}
function prevResult() {
$currentResult = getCurrentResult();
if ($currentResult)
$currentResult
.removeClass(options.selectClass)
.prev()
.addClass(options.selectClass);
else
$results.children('li:last-child').addClass(options.selectClass);
}
}
$.fn.suggest = function(source, options) {
if (!source)
return;
options = options || {};
options.source = source;
options.delay = options.delay || 100;
options.resultsClass = options.resultsClass || 'ac_results';
options.selectClass = options.selectClass || 'ac_over';
options.matchClass = options.matchClass || 'ac_match';
options.minchars = options.minchars || 1;
options.delimiter = options.delimiter || '\n';
options.onSelect = options.onSelect || false;
options.maxCacheSize = options.maxCacheSize || 65536;
this.each(function() {
new $.suggest(this, options);
});
return this;
};
})(jQuery);