jQuery Autocomplete: автозаполнение

/*
* jQuery Autocomplete plugin 1.1
*
* Copyright (c) 2009 Jörn Zaefferer
*
* Dual licensed under the MIT and GPL licenses:
*  http://www.opensource.org/licenses/mit-license.php
*  http://www.gnu.org/licenses/gpl.html
*
* Revision: $Id: jquery.autocomplete.js 15 2009-08-22 10:30:27Z joern.zaefferer $
*/
 
;(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;

                            

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