autocomplete fix

// fix autocomplete

/*
* Unobtrusive autocomplete
*
* To use it, you just have to include the HTML attribute autocomplete
* with the autocomplete URL as the value
*
*   Example:
*       <input type="text" data-autocomplete="/url/to/autocomplete">
*
* Optionally, you can use a jQuery selector to specify a field that can
* be updated with the element id whenever you find a matching value
*
*   Example:
*       <input type="text" data-autocomplete="/url/to/autocomplete" data-id-element="#id_field">
*/

(function(jQuery)
 {
    var self = null;
    var options = {};
    jQuery.fn.railsAutocomplete = function() {
        var handler = function() {
            if (!this.railsAutoCompleter) {
                this.railsAutoCompleter = new jQuery.railsAutocomplete(this);
            }
        };
        options[this.selector.replace('#', '')] = arguments[0];
        if (jQuery.fn.on !== undefined) {
            return $(document).on('focus',this.selector,handler);
        }
        else {
            return this.live('focus',handler);
        }
    };

    jQuery.railsAutocomplete = function (e) {
        _e = e;
        this.init(_e);
    };

    jQuery.railsAutocomplete.fn = jQuery.railsAutocomplete.prototype = {
        railsAutocomplete: '0.0.2'
    };

    jQuery.railsAutocomplete.fn.extend = jQuery.railsAutocomplete.extend = jQuery.extend;
    jQuery.railsAutocomplete.fn.extend({
        init: function(e) {
            e.delimiter = jQuery(e).attr('data-delimiter') || null;
            function split( val ) {
                return val.split( e.delimiter );
            }
            function extractLast( term ) {
                return split( term ).pop().replace(/^\s+/,"");
            }

            jQuery(e).autocomplete($.extend({
                source: function( request, response ) {
                    jQuery.getJSON( jQuery(e).attr('data-autocomplete'), {
                        term: extractLast( request.term )
                    }, function() {
                        if(arguments[0].length == 0) {
                            var label = "No existing matches";
                            if(jQuery(e).attr('data-autocomplete-label') !== undefined) {
                                label = jQuery(e).attr('data-autocomplete-label');
                            }
                            arguments[0] = [];
                            arguments[0][0] = { id: "", label: label };
                        }
                        jQuery(arguments[0]).each(function(i, el) {
                            var obj = {};
                            obj[el.id] = el;
                            jQuery(e).data(obj);
                        });
                        response.apply(null, arguments);
                    });
                },
                change: function( event, ui ) {
                    if(jQuery(jQuery(this).attr('data-id-element')).val() == "") {
                        return;
                    }
                    jQuery(jQuery(this).attr('data-id-element')).val(ui.item ? ui.item.id : "");
                    var update_elements = false;
                    if (jQuery(this).attr('data-update-elements')) {
                        update_elements = jQuery.parseJSON(jQuery(this).attr("data-update-elements"));
                    }
                    var data = ui.item ? jQuery(this).data(ui.item.id.toString()) : {};
                    if(update_elements && jQuery(update_elements['id']).val() == "") {
                        return;
                    }

                    // alert('going to clear the data');
                    for (var key in update_elements) {
                        // field not empty
                        if ( jQuery(update_elements[key]).val() ) {
                            // do nothing, thus preserving previously entered data

                        } else {
                            jQuery(update_elements[key]).val(ui.item ? data[key] : "");
                        }
                    }
                },
                minLength: 2,
                focus: function() {
                    // prevent value inserted on focus
                    return false;
                },
                select: function( event, ui ) {
                    var terms = split( this.value );
                    // remove the current input
                    terms.pop();
                    // add the selected item only if it has something
                    if (ui.item.id != ""){
                        terms.push( ui.item.value );
                    }
                    // add placeholder to get the comma-and-space at the end
                    if (e.delimiter != null) {
                        terms.push( "" );
                        this.value = terms.join( e.delimiter );
                    } else {
                        this.value = terms.join("");
                        if (jQuery(this).attr('data-id-element')) {
                            jQuery(jQuery(this).attr('data-id-element')).val(ui.item.id);
                        }
                        if (jQuery(this).attr('data-update-elements')) {
                            var data = jQuery(this).data(ui.item.id.toString());
                            var update_elements = jQuery.parseJSON(jQuery(this).attr("data-update-elements"));

                            // console.log(data);
                            // alert('overwriting with json data or blanking everything if no match found ' +update_elements);
                            for (var key in update_elements) {
                                // field not empty
                                if ( jQuery(update_elements[key]).val() ) {
                                    // overwrite only if record found in the db
                                    if (data['id']) {
                                        jQuery(update_elements[key]).val(data[key]);
                                    }
                                } else {
                                    jQuery(update_elements[key]).val(data[key]);
                                }
                            }
                        }
                    }
                    var remember_string = this.value;
                    jQuery(this).bind('keyup.clearId', function(){
                        if(jQuery(this).val().trim() != remember_string.trim()){
                            jQuery(jQuery(this).attr('data-id-element')).val("");
                            jQuery(this).unbind('keyup.clearId');
                        }
                    });
                    jQuery(e).trigger('railsAutocomplete.select', ui);
                    return false;
                }
            }, options[e.id]));
        }
    });

    jQuery(document).ready(function(){
        jQuery('input[data-autocomplete]').railsAutocomplete();
    });
})(jQuery);