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Filename : jquery.autocomplete.js
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/**
*  Ajax Autocomplete for jQuery, version 1.2.9
*  (c) 2013 Tomas Kirda
*
*  Ajax Autocomplete for jQuery is freely distributable under the terms of an MIT-style license.
*  For details, see the web site: https://github.com/devbridge/jQuery-Autocomplete
*
*/

/*jslint  browser: true, white: true, plusplus: true */
/*global define, window, document, jQuery */

// Expose plugin as an AMD module if AMD loader is present:
(function (factory) {
    'use strict';
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery'], factory);
    } else {
        // Browser globals
        factory(jQuery);
    }
}(function ($) {
    'use strict';

    var
        utils = (function () {
            return {
                escapeRegExChars: function (value) {
                    return value.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
                },
                createNode: function (containerClass) {
                    var div = document.createElement('div');
                    div.className = containerClass;
                    div.style.position = 'absolute';
                    div.style.display = 'none';
                    return div;
                }
            };
        }()),

        keys = {
            ESC: 27,
            TAB: 9,
            RETURN: 13,
            LEFT: 37,
            UP: 38,
            RIGHT: 39,
            DOWN: 40
        };

    function Autocomplete(el, options) {
        var noop = function () { },
            that = this,
            defaults = {
                autoSelectFirst: false,
                appendTo: 'body',
                serviceUrl: null,
                lookup: null,
                onSelect: null,
                width: 'auto',
                minChars: 1,
                maxHeight: 300,
                deferRequestBy: 0,
                params: {},
                formatResult: Autocomplete.formatResult,
                delimiter: null,
                zIndex: 9999,
                type: 'GET',
                noCache: false,
                onSearchStart: noop,
                onSearchComplete: noop,
                onSearchError: noop,
                containerClass: 'autocomplete-suggestions',
                tabDisabled: false,
                dataType: 'text',
                currentRequest: null,
                triggerSelectOnValidInput: true,
                preventBadQueries: true,
                lookupFilter: function (suggestion, originalQuery, queryLowerCase) {
                    return suggestion.value.toLowerCase().indexOf(queryLowerCase) !== -1;
                },
                paramName: 'query',
                transformResult: function (response) {
                    return typeof response === 'string' ? $.parseJSON(response) : response;
                }
            };

        // Shared variables:
        that.element = el;
        that.el = $(el);
        that.suggestions = [];
        that.badQueries = [];
        that.selectedIndex = -1;
        that.currentValue = that.element.value;
        that.intervalId = 0;
        that.cachedResponse = {};
        that.onChangeInterval = null;
        that.onChange = null;
        that.isLocal = false;
        that.suggestionsContainer = null;
        that.options = $.extend({}, defaults, options);
        that.classes = {
            selected: 'autocomplete-selected',
            suggestion: 'autocomplete-suggestion'
        };
        that.hint = null;
        that.hintValue = '';
        that.selection = null;

        // Initialize and set options:
        that.initialize();
        that.setOptions(options);
    }

    Autocomplete.utils = utils;

    $.Autocomplete = Autocomplete;

    Autocomplete.formatResult = function (suggestion, currentValue) {
        var pattern = '(' + utils.escapeRegExChars(currentValue) + ')';

        return suggestion.value.replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>');
    };

    Autocomplete.prototype = {

        killerFn: null,

        initialize: function () {
            var that = this,
                suggestionSelector = '.' + that.classes.suggestion,
                selected = that.classes.selected,
                options = that.options,
                container;

            // Remove autocomplete attribute to prevent native suggestions:
            that.element.setAttribute('autocomplete', 'off');

            that.killerFn = function (e) {
                if ($(e.target).closest('.' + that.options.containerClass).length === 0) {
                    that.killSuggestions();
                    that.disableKillerFn();
                }
            };

            that.suggestionsContainer = Autocomplete.utils.createNode(options.containerClass);

            container = $(that.suggestionsContainer);

            container.appendTo(options.appendTo);

            // Only set width if it was provided:
            if (options.width !== 'auto') {
                container.width(options.width);
            }

            // Listen for mouse over event on suggestions list:
            container.on('mouseover.autocomplete', suggestionSelector, function () {
                that.activate($(this).data('index'));
            });

            // Deselect active element when mouse leaves suggestions container:
            container.on('mouseout.autocomplete', function () {
                that.selectedIndex = -1;
                container.children('.' + selected).removeClass(selected);
            });

            // Listen for click event on suggestions list:
            container.on('click.autocomplete', suggestionSelector, function () {
                that.select($(this).data('index'));
            });

            that.fixPosition();

            that.fixPositionCapture = function () {
                if (that.visible) {
                    that.fixPosition();
                }
            };

            $(window).on('resize.autocomplete', that.fixPositionCapture);

            that.el.on('keydown.autocomplete', function (e) { that.onKeyPress(e); });
            that.el.on('keyup.autocomplete', function (e) { that.onKeyUp(e); });
            that.el.on('blur.autocomplete', function () { that.onBlur(); });
            that.el.on('focus.autocomplete', function () { that.onFocus(); });
            that.el.on('change.autocomplete', function (e) { that.onKeyUp(e); });
        },

        onFocus: function () {
            var that = this;
            that.fixPosition();
            if (that.options.minChars <= that.el.val().length) {
                that.onValueChange();
            }
        },

        onBlur: function () {
            this.enableKillerFn();
        },

        setOptions: function (suppliedOptions) {
            var that = this,
                options = that.options;

            $.extend(options, suppliedOptions);

            that.isLocal = $.isArray(options.lookup);

            if (that.isLocal) {
                options.lookup = that.verifySuggestionsFormat(options.lookup);
            }

            // Adjust height, width and z-index:
            $(that.suggestionsContainer).css({
                'max-height': options.maxHeight + 'px',
                'width': options.width + 'px',
                'z-index': options.zIndex
            });
        },

        clearCache: function () {
            this.cachedResponse = {};
            this.badQueries = [];
        },

        clear: function () {
            this.clearCache();
            this.currentValue = '';
            this.suggestions = [];
        },

        disable: function () {
            var that = this;
            that.disabled = true;
            if (that.currentRequest) {
                that.currentRequest.abort();
            }
        },

        enable: function () {
            this.disabled = false;
        },

        fixPosition: function () {
            var that = this,
                offset,
                styles;

            // Don't adjsut position if custom container has been specified:
            if (that.options.appendTo !== 'body') {
                return;
            }

            offset = that.el.offset();

            styles = {
                top: (offset.top + that.el.outerHeight()) + 'px',
                left: offset.left + 'px'
            };

            if (that.options.width === 'auto') {
                styles.width = (that.el.outerWidth() - 2) + 'px';
            }

            $(that.suggestionsContainer).css(styles);
        },

        enableKillerFn: function () {
            var that = this;
            $(document).on('click.autocomplete', that.killerFn);
        },

        disableKillerFn: function () {
            var that = this;
            $(document).off('click.autocomplete', that.killerFn);
        },

        killSuggestions: function () {
            var that = this;
            that.stopKillSuggestions();
            that.intervalId = window.setInterval(function () {
                that.hide();
                that.stopKillSuggestions();
            }, 50);
        },

        stopKillSuggestions: function () {
            window.clearInterval(this.intervalId);
        },

        isCursorAtEnd: function () {
            var that = this,
                valLength = that.el.val().length,
                selectionStart = that.element.selectionStart,
                range;

            if (typeof selectionStart === 'number') {
                return selectionStart === valLength;
            }
            if (document.selection) {
                range = document.selection.createRange();
                range.moveStart('character', -valLength);
                return valLength === range.text.length;
            }
            return true;
        },

        onKeyPress: function (e) {
            var that = this;

            // If suggestions are hidden and user presses arrow down, display suggestions:
            if (!that.disabled && !that.visible && e.which === keys.DOWN && that.currentValue) {
                that.suggest();
                return;
            }

            if (that.disabled || !that.visible) {
                return;
            }

            switch (e.which) {
                case keys.ESC:
                    that.el.val(that.currentValue);
                    that.hide();
                    break;
                case keys.RIGHT:
                    if (that.hint && that.options.onHint && that.isCursorAtEnd()) {
                        that.selectHint();
                        break;
                    }
                    return;
                case keys.TAB:
                    if (that.hint && that.options.onHint) {
                        that.selectHint();
                        return;
                    }
                    // Fall through to RETURN
                case keys.RETURN:
                    if (that.selectedIndex === -1) {
                        that.hide();
                        return;
                    }
                    that.select(that.selectedIndex);
                    if (e.which === keys.TAB && that.options.tabDisabled === false) {
                        return;
                    }
                    break;
                case keys.UP:
                    that.moveUp();
                    break;
                case keys.DOWN:
                    that.moveDown();
                    break;
                default:
                    return;
            }

            // Cancel event if function did not return:
            e.stopImmediatePropagation();
            e.preventDefault();
        },

        onKeyUp: function (e) {
            var that = this;

            if (that.disabled) {
                return;
            }

            switch (e.which) {
                case keys.UP:
                case keys.DOWN:
                    return;
            }

            clearInterval(that.onChangeInterval);

            if (that.currentValue !== that.el.val()) {
                that.findBestHint();
                if (that.options.deferRequestBy > 0) {
                    // Defer lookup in case when value changes very quickly:
                    that.onChangeInterval = setInterval(function () {
                        that.onValueChange();
                    }, that.options.deferRequestBy);
                } else {
                    that.onValueChange();
                }
            }
        },

        onValueChange: function () {
            var that = this,
                options = that.options,
                value = that.el.val(),
                query = that.getQuery(value),
                index;

            if (that.selection) {
                that.selection = null;
                (options.onInvalidateSelection || $.noop).call(that.element);
            }

            clearInterval(that.onChangeInterval);
            that.currentValue = value;
            that.selectedIndex = -1;

            // Check existing suggestion for the match before proceeding:
            if (options.triggerSelectOnValidInput) {
                index = that.findSuggestionIndex(query);
                if (index !== -1) {
                    that.select(index);
                    return;
                }
            }

            if (query.length < options.minChars) {
                that.hide();
            } else {
                that.getSuggestions(query);
            }
        },

        findSuggestionIndex: function (query) {
            var that = this,
                index = -1,
                queryLowerCase = query.toLowerCase();

            $.each(that.suggestions, function (i, suggestion) {
                if (suggestion.value.toLowerCase() === queryLowerCase) {
                    index = i;
                    return false;
                }
            });

            return index;
        },

        getQuery: function (value) {
            var delimiter = this.options.delimiter,
                parts;

            if (!delimiter) {
                return value;
            }
            parts = value.split(delimiter);
            return $.trim(parts[parts.length - 1]);
        },

        getSuggestionsLocal: function (query) {
            var that = this,
                options = that.options,
                queryLowerCase = query.toLowerCase(),
                filter = options.lookupFilter,
                limit = parseInt(options.lookupLimit, 10),
                data;

            data = {
                suggestions: $.grep(options.lookup, function (suggestion) {
                    return filter(suggestion, query, queryLowerCase);
                })
            };

            if (limit && data.suggestions.length > limit) {
                data.suggestions = data.suggestions.slice(0, limit);
            }

            return data;
        },

        getSuggestions: function (q) {
            var response,
                that = this,
                options = that.options,
                serviceUrl = options.serviceUrl,
                params,
                cacheKey;

            options.params[options.paramName] = q;
            params = options.ignoreParams ? null : options.params;

            if (that.isLocal) {
                response = that.getSuggestionsLocal(q);
            } else {
                if ($.isFunction(serviceUrl)) {
                    serviceUrl = serviceUrl.call(that.element, q);
                }
                cacheKey = serviceUrl + '?' + $.param(params || {});
                response = that.cachedResponse[cacheKey];
            }

            if (response && $.isArray(response.suggestions)) {
                that.suggestions = response.suggestions;
                that.suggest();
            } else if (!that.isBadQuery(q)) {
                if (options.onSearchStart.call(that.element, options.params) === false) {
                    return;
                }
                if (that.currentRequest) {
                    that.currentRequest.abort();
                }
                that.currentRequest = $.ajax({
                    url: serviceUrl,
                    data: params,
                    type: options.type,
                    dataType: options.dataType
                }).done(function (data) {
                    var result;
                    that.currentRequest = null;
                    result = options.transformResult(data);
                    that.processResponse(result, q, cacheKey);
                    options.onSearchComplete.call(that.element, q, result.suggestions);
                }).fail(function (jqXHR, textStatus, errorThrown) {
                    options.onSearchError.call(that.element, q, jqXHR, textStatus, errorThrown);
                });
            }
        },

        isBadQuery: function (q) {
            if (!this.options.preventBadQueries){
                return false;
            }

            var badQueries = this.badQueries,
                i = badQueries.length;

            while (i--) {
                if (q.indexOf(badQueries[i]) === 0) {
                    return true;
                }
            }

            return false;
        },

        hide: function () {
            var that = this;
            that.visible = false;
            that.selectedIndex = -1;
            $(that.suggestionsContainer).hide();
            that.signalHint(null);
        },

        suggest: function () {
            if (this.suggestions.length === 0) {
                this.hide();
                return;
            }

            var that = this,
                options = that.options,
                formatResult = options.formatResult,
                value = that.getQuery(that.currentValue),
                className = that.classes.suggestion,
                classSelected = that.classes.selected,
                container = $(that.suggestionsContainer),
                beforeRender = options.beforeRender,
                html = '',
                index,
                width;

            if (options.triggerSelectOnValidInput) {
                index = that.findSuggestionIndex(value);
                if (index !== -1) {
                    that.select(index);
                    return;
                }
            }

            // Build suggestions inner HTML:
            $.each(that.suggestions, function (i, suggestion) {
                html += '<div class="' + className + '" data-index="' + i + '">' + formatResult(suggestion, value) + '</div>';
            });

            // If width is auto, adjust width before displaying suggestions,
            // because if instance was created before input had width, it will be zero.
            // Also it adjusts if input width has changed.
            // -2px to account for suggestions border.
            if (options.width === 'auto') {
                width = that.el.outerWidth() - 2;
                container.width(width > 0 ? width : 300);
            }

            container.html(html);

            // Select first value by default:
            if (options.autoSelectFirst) {
                that.selectedIndex = 0;
                container.children().first().addClass(classSelected);
            }

            if ($.isFunction(beforeRender)) {
                beforeRender.call(that.element, container);
            }

            container.show();
            that.visible = true;

            that.findBestHint();
        },

        findBestHint: function () {
            var that = this,
                value = that.el.val().toLowerCase(),
                bestMatch = null;

            if (!value) {
                return;
            }

            $.each(that.suggestions, function (i, suggestion) {
                var foundMatch = suggestion.value.toLowerCase().indexOf(value) === 0;
                if (foundMatch) {
                    bestMatch = suggestion;
                }
                return !foundMatch;
            });

            that.signalHint(bestMatch);
        },

        signalHint: function (suggestion) {
            var hintValue = '',
                that = this;
            if (suggestion) {
                hintValue = that.currentValue + suggestion.value.substr(that.currentValue.length);
            }
            if (that.hintValue !== hintValue) {
                that.hintValue = hintValue;
                that.hint = suggestion;
                (this.options.onHint || $.noop)(hintValue);
            }
        },

        verifySuggestionsFormat: function (suggestions) {
            // If suggestions is string array, convert them to supported format:
            if (suggestions.length && typeof suggestions[0] === 'string') {
                return $.map(suggestions, function (value) {
                    return { value: value, data: null };
                });
            }

            return suggestions;
        },

        processResponse: function (result, originalQuery, cacheKey) {
            var that = this,
                options = that.options;

            result.suggestions = that.verifySuggestionsFormat(result.suggestions);

            // Cache results if cache is not disabled:
            if (!options.noCache) {
                that.cachedResponse[cacheKey] = result;
                if (options.preventBadQueries && result.suggestions.length === 0) {
                    that.badQueries.push(originalQuery);
                }
            }

            // Return if originalQuery is not matching current query:
            if (originalQuery !== that.getQuery(that.currentValue)) {
                return;
            }

            that.suggestions = result.suggestions;
            that.suggest();
        },

        activate: function (index) {
            var that = this,
                activeItem,
                selected = that.classes.selected,
                container = $(that.suggestionsContainer),
                children = container.children();

            container.children('.' + selected).removeClass(selected);

            that.selectedIndex = index;

            if (that.selectedIndex !== -1 && children.length > that.selectedIndex) {
                activeItem = children.get(that.selectedIndex);
                $(activeItem).addClass(selected);
                return activeItem;
            }

            return null;
        },

        selectHint: function () {
            var that = this,
                i = $.inArray(that.hint, that.suggestions);

            that.select(i);
        },

        select: function (i) {
            var that = this;
            that.hide();
            that.onSelect(i);
        },

        moveUp: function () {
            var that = this;

            if (that.selectedIndex === -1) {
                return;
            }

            if (that.selectedIndex === 0) {
                $(that.suggestionsContainer).children().first().removeClass(that.classes.selected);
                that.selectedIndex = -1;
                that.el.val(that.currentValue);
                that.findBestHint();
                return;
            }

            that.adjustScroll(that.selectedIndex - 1);
        },

        moveDown: function () {
            var that = this;

            if (that.selectedIndex === (that.suggestions.length - 1)) {
                return;
            }

            that.adjustScroll(that.selectedIndex + 1);
        },

        adjustScroll: function (index) {
            var that = this,
                activeItem = that.activate(index),
                offsetTop,
                upperBound,
                lowerBound,
                heightDelta = 25;

            if (!activeItem) {
                return;
            }

            offsetTop = activeItem.offsetTop;
            upperBound = $(that.suggestionsContainer).scrollTop();
            lowerBound = upperBound + that.options.maxHeight - heightDelta;

            if (offsetTop < upperBound) {
                $(that.suggestionsContainer).scrollTop(offsetTop);
            } else if (offsetTop > lowerBound) {
                $(that.suggestionsContainer).scrollTop(offsetTop - that.options.maxHeight + heightDelta);
            }

            that.el.val(that.getValue(that.suggestions[index].value));
            that.signalHint(null);
        },

        onSelect: function (index) {
            var that = this,
                onSelectCallback = that.options.onSelect,
                suggestion = that.suggestions[index];

            that.currentValue = that.getValue(suggestion.value);

            if (that.currentValue !== that.el.val()) {
                that.el.val(that.currentValue);
            }

            that.signalHint(null);
            that.suggestions = [];
            that.selection = suggestion;

            if ($.isFunction(onSelectCallback)) {
                onSelectCallback.call(that.element, suggestion);
            }
        },

        getValue: function (value) {
            var that = this,
                delimiter = that.options.delimiter,
                currentValue,
                parts;

            if (!delimiter) {
                return value;
            }

            currentValue = that.currentValue;
            parts = currentValue.split(delimiter);

            if (parts.length === 1) {
                return value;
            }

            return currentValue.substr(0, currentValue.length - parts[parts.length - 1].length) + value;
        },

        dispose: function () {
            var that = this;
            that.el.off('.autocomplete').removeData('autocomplete');
            that.disableKillerFn();
            $(window).off('resize.autocomplete', that.fixPositionCapture);
            $(that.suggestionsContainer).remove();
        }
    };

    // Create chainable jQuery plugin:
    $.fn.autocomplete = function (options, args) {
        var dataKey = 'autocomplete';
        // If function invoked without argument return
        // instance of the first matched element:
        if (arguments.length === 0) {
            return this.first().data(dataKey);
        }

        return this.each(function () {
            var inputElement = $(this),
                instance = inputElement.data(dataKey);

            if (typeof options === 'string') {
                if (instance && typeof instance[options] === 'function') {
                    instance[options](args);
                }
            } else {
                // If instance already exists, destroy it:
                if (instance && instance.dispose) {
                    instance.dispose();
                }
                instance = new Autocomplete(this, options);
                inputElement.data(dataKey, instance);
            }
        });
    };
}));