Proyectos de Subversion Moodle

/*
 * Autocomplete - jQuery plugin 1.0.2
 *
 * Copyright (c) 2007 Dylan Verheul, Dan G. Switzer, Anjesh Tuladhar, 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,v 1.1.1.1 2009-03-17 18:35:18 kannan Exp $
 *
 */

;(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) {
                // 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 ) {
                                v = words.slice(0, words.length - 1).join( options.multipleSeparator ) + options.multipleSeparator + v;
                        }
                        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 [""];
                }
                var words = value.split( options.multipleSeparator );
                var result = [];
                $.each(words, function(i, value) {
                        if ( $.trim(value) )
                                result[i] = $.trim(value);
                });
                return result;
        }
        
        function lastWord(value) {
                if ( !options.multiple )
                        return value;
                var words = trimWords(value);
                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)
                        $.Autocompleter.Selection(input, 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( "" );
                                        }
                                }
                        );
                }
                if (wasVisible)
                        // position cursor at end of input field
                        $.Autocompleter.Selection(input, input.value.length, input.value.length);
        };

        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 (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")
                .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();
                }
        };
};

$.Autocompleter.Selection = function(field, start, end) {
        if( field.createTextRange ){
                var selRange = field.createTextRange();
                selRange.collapse(true);
                selRange.moveStart("character", start);
                selRange.moveEnd("character", end);
                selRange.select();
        } else if( field.setSelectionRange ){
                field.setSelectionRange(start, end);
        } else {
                if( field.selectionStart ){
                        field.selectionStart = start;
                        field.selectionEnd = end;
                }
        }
        field.focus();
};

})(jQuery);