chosen.proto.js

/*!
Chosen, a Select Box Enhancer for jQuery and Prototype
by Patrick Filler for Harvest, http://getharvest.com

Version 1.1.0
Full source at https://github.com/harvesthq/chosen
Copyright (c) 2011 Harvest http://getharvest.com

MIT License, https://github.com/harvesthq/chosen/blob/master/LICENSE.md
This file is generated by `grunt build`, do not edit it by hand.
*/

(function() {
  var AbstractChosen, SelectParser, _ref,
    __hasProp = {}.hasOwnProperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

  SelectParser = (function() {
    function SelectParser() {
      this.options_index = 0;
      this.parsed = [];
    }

    SelectParser.prototype.add_node = function(child) {
      if (child.nodeName.toUpperCase() === "OPTGROUP") {
        return this.add_group(child);
      } else {
        return this.add_option(child);
      }
    };

    SelectParser.prototype.add_group = function(group) {
      var group_position, option, _i, _len, _ref, _results;
      group_position = this.parsed.length;
      this.parsed.push({
        array_index: group_position,
        group: true,
        label: this.escapeExpression(group.label),
        children: 0,
        disabled: group.disabled
      });
      _ref = group.childNodes;
      _results = [];
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        option = _ref[_i];
        _results.push(this.add_option(option, group_position, group.disabled));
      }
      return _results;
    };

    SelectParser.prototype.add_option = function(option, group_position, group_disabled) {
      if (option.nodeName.toUpperCase() === "OPTION") {
        if (option.text !== "") {
          if (group_position != null) {
            this.parsed[group_position].children += 1;
          }
          this.parsed.push({
            array_index: this.parsed.length,
            options_index: this.options_index,
            value: option.value,
            text: option.text,
            html: option.innerHTML,
            selected: option.selected,
            disabled: group_disabled === true ? group_disabled : option.disabled,
            group_array_index: group_position,
            classes: option.className,
            style: option.style.cssText
          });
        } else {
          this.parsed.push({
            array_index: this.parsed.length,
            options_index: this.options_index,
            empty: true
          });
        }
        return this.options_index += 1;
      }
    };

    SelectParser.prototype.escapeExpression = function(text) {
      var map, unsafe_chars;
      if ((text == null) || text === false) {
        return "";
      }
      if (!/[\&\<\>\"\'\`]/.test(text)) {
        return text;
      }
      map = {
        "<": "&lt;",
        ">": "&gt;",
        '"': "&quot;",
        "'": "&#x27;",
        "`": "&#x60;"
      };
      unsafe_chars = /&(?!\w+;)|[\<\>\"\'\`]/g;
      return text.replace(unsafe_chars, function(chr) {
        return map[chr] || "&amp;";
      });
    };

    return SelectParser;

  })();

  SelectParser.select_to_array = function(select) {
    var child, parser, _i, _len, _ref;
    parser = new SelectParser();
    _ref = select.childNodes;
    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
      child = _ref[_i];
      parser.add_node(child);
    }
    return parser.parsed;
  };

  AbstractChosen = (function() {
    function AbstractChosen(form_field, options) {
      this.form_field = form_field;
      this.options = options != null ? options : {};
      if (!AbstractChosen.browser_is_supported()) {
        return;
      }
      this.is_multiple = this.form_field.multiple;
      this.set_default_text();
      this.set_default_values();
      this.setup();
      this.set_up_html();
      this.register_observers();
    }

    AbstractChosen.prototype.set_default_values = function() {
      var _this = this;
      this.click_test_action = function(evt) {
        return _this.test_active_click(evt);
      };
      this.activate_action = function(evt) {
        return _this.activate_field(evt);
      };
      this.active_field = false;
      this.mouse_on_container = false;
      this.results_showing = false;
      this.result_highlighted = null;
      this.allow_single_deselect = (this.options.allow_single_deselect != null) && (this.form_field.options[0] != null) && this.form_field.options[0].text === "" ? this.options.allow_single_deselect : false;
      this.disable_search_threshold = this.options.disable_search_threshold || 0;
      this.disable_search = this.options.disable_search || false;
      this.enable_split_word_search = this.options.enable_split_word_search != null ? this.options.enable_split_word_search : true;
      this.group_search = this.options.group_search != null ? this.options.group_search : true;
      this.search_contains = this.options.search_contains || false;
      this.single_backstroke_delete = this.options.single_backstroke_delete != null ? this.options.single_backstroke_delete : true;
      this.max_selected_options = this.options.max_selected_options || Infinity;
      this.inherit_select_classes = this.options.inherit_select_classes || false;
      this.display_selected_options = this.options.display_selected_options != null ? this.options.display_selected_options : true;
      return this.display_disabled_options = this.options.display_disabled_options != null ? this.options.display_disabled_options : true;
    };

    AbstractChosen.prototype.set_default_text = function() {
      if (this.form_field.getAttribute("data-placeholder")) {
        this.default_text = this.form_field.getAttribute("data-placeholder");
      } else if (this.is_multiple) {
        this.default_text = this.options.placeholder_text_multiple || this.options.placeholder_text || AbstractChosen.default_multiple_text;
      } else {
        this.default_text = this.options.placeholder_text_single || this.options.placeholder_text || AbstractChosen.default_single_text;
      }
      return this.results_none_found = this.form_field.getAttribute("data-no_results_text") || this.options.no_results_text || AbstractChosen.default_no_result_text;
    };

    AbstractChosen.prototype.mouse_enter = function() {
      return this.mouse_on_container = true;
    };

    AbstractChosen.prototype.mouse_leave = function() {
      return this.mouse_on_container = false;
    };

    AbstractChosen.prototype.input_focus = function(evt) {
      var _this = this;
      if (this.is_multiple) {
        if (!this.active_field) {
          return setTimeout((function() {
            return _this.container_mousedown();
          }), 50);
        }
      } else {
        if (!this.active_field) {
          return this.activate_field();
        }
      }
    };

    AbstractChosen.prototype.input_blur = function(evt) {
      var _this = this;
      if (!this.mouse_on_container) {
        this.active_field = false;
        return setTimeout((function() {
          return _this.blur_test();
        }), 100);
      }
    };

    AbstractChosen.prototype.results_option_build = function(options) {
      var content, data, _i, _len, _ref;
      content = '';
      _ref = this.results_data;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        data = _ref[_i];
        if (data.group) {
          content += this.result_add_group(data);
        } else {
          content += this.result_add_option(data);
        }
        if (options != null ? options.first : void 0) {
          if (data.selected && this.is_multiple) {
            this.choice_build(data);
          } else if (data.selected && !this.is_multiple) {
            this.single_set_selected_text(data.text);
          }
        }
      }
      return content;
    };

    AbstractChosen.prototype.result_add_option = function(option) {
      var classes, option_el;
      if (!option.search_match) {
        return '';
      }
      if (!this.include_option_in_results(option)) {
        return '';
      }
      classes = [];
      if (!option.disabled && !(option.selected && this.is_multiple)) {
        classes.push("active-result");
      }
      if (option.disabled && !(option.selected && this.is_multiple)) {
        classes.push("disabled-result");
      }
      if (option.selected) {
        classes.push("result-selected");
      }
      if (option.group_array_index != null) {
        classes.push("group-option");
      }
      if (option.classes !== "") {
        classes.push(option.classes);
      }
      option_el = document.createElement("li");
      option_el.className = classes.join(" ");
      option_el.style.cssText = option.style;
      option_el.setAttribute("data-option-array-index", option.array_index);
      option_el.innerHTML = option.search_text;
      return this.outerHTML(option_el);
    };

    AbstractChosen.prototype.result_add_group = function(group) {
      var group_el;
      if (!(group.search_match || group.group_match)) {
        return '';
      }
      if (!(group.active_options > 0)) {
        return '';
      }
      group_el = document.createElement("li");
      group_el.className = "group-result";
      group_el.innerHTML = group.search_text;
      return this.outerHTML(group_el);
    };

    AbstractChosen.prototype.results_update_field = function() {
      this.set_default_text();
      if (!this.is_multiple) {
        this.results_reset_cleanup();
      }
      this.result_clear_highlight();
      this.results_build();
      if (this.results_showing) {
        return this.winnow_results();
      }
    };

    AbstractChosen.prototype.reset_single_select_options = function() {
      var result, _i, _len, _ref, _results;
      _ref = this.results_data;
      _results = [];
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        result = _ref[_i];
        if (result.selected) {
          _results.push(result.selected = false);
        } else {
          _results.push(void 0);
        }
      }
      return _results;
    };

    AbstractChosen.prototype.results_toggle = function() {
      if (this.results_showing) {
        return this.results_hide();
      } else {
        return this.results_show();
      }
    };

    AbstractChosen.prototype.results_search = function(evt) {
      if (this.results_showing) {
        return this.winnow_results();
      } else {
        return this.results_show();
      }
    };

    AbstractChosen.prototype.winnow_results = function() {
      var escapedSearchText, option, regex, regexAnchor, results, results_group, searchText, startpos, text, zregex, _i, _len, _ref;
      this.no_results_clear();
      results = 0;
      searchText = this.get_search_text();
      escapedSearchText = searchText.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
      regexAnchor = this.search_contains ? "" : "^";
      regex = new RegExp(regexAnchor + escapedSearchText, 'i');
      zregex = new RegExp(escapedSearchText, 'i');
      _ref = this.results_data;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        option = _ref[_i];
        option.search_match = false;
        results_group = null;
        if (this.include_option_in_results(option)) {
          if (option.group) {
            option.group_match = false;
            option.active_options = 0;
          }
          if ((option.group_array_index != null) && this.results_data[option.group_array_index]) {
            results_group = this.results_data[option.group_array_index];
            if (results_group.active_options === 0 && results_group.search_match) {
              results += 1;
            }
            results_group.active_options += 1;
          }
          if (!(option.group && !this.group_search)) {
            option.search_text = option.group ? option.label : option.html;
            option.search_match = this.search_string_match(option.search_text, regex);
            if (option.search_match && !option.group) {
              results += 1;
            }
            if (option.search_match) {
              if (searchText.length) {
                startpos = option.search_text.search(zregex);
                text = option.search_text.substr(0, startpos + searchText.length) + '</em>' + option.search_text.substr(startpos + searchText.length);
                option.search_text = text.substr(0, startpos) + '<em>' + text.substr(startpos);
              }
              if (results_group != null) {
                results_group.group_match = true;
              }
            } else if ((option.group_array_index != null) && this.results_data[option.group_array_index].search_match) {
              option.search_match = true;
            }
          }
        }
      }
      this.result_clear_highlight();
      if (results < 1 && searchText.length) {
        this.update_results_content("");
        return this.no_results(searchText);
      } else {
        this.update_results_content(this.results_option_build());
        return this.winnow_results_set_highlight();
      }
    };

    AbstractChosen.prototype.search_string_match = function(search_string, regex) {
      var part, parts, _i, _len;
      if (regex.test(search_string)) {
        return true;
      } else if (this.enable_split_word_search && (search_string.indexOf(" ") >= 0 || search_string.indexOf("[") === 0)) {
        parts = search_string.replace(/\[|\]/g, "").split(" ");
        if (parts.length) {
          for (_i = 0, _len = parts.length; _i < _len; _i++) {
            part = parts[_i];
            if (regex.test(part)) {
              return true;
            }
          }
        }
      }
    };

    AbstractChosen.prototype.choices_count = function() {
      var option, _i, _len, _ref;
      if (this.selected_option_count != null) {
        return this.selected_option_count;
      }
      this.selected_option_count = 0;
      _ref = this.form_field.options;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        option = _ref[_i];
        if (option.selected) {
          this.selected_option_count += 1;
        }
      }
      return this.selected_option_count;
    };

    AbstractChosen.prototype.choices_click = function(evt) {
      evt.preventDefault();
      if (!(this.results_showing || this.is_disabled)) {
        return this.results_show();
      }
    };

    AbstractChosen.prototype.keyup_checker = function(evt) {
      var stroke, _ref;
      stroke = (_ref = evt.which) != null ? _ref : evt.keyCode;
      this.search_field_scale();
      switch (stroke) {
        case 8:
          if (this.is_multiple && this.backstroke_length < 1 && this.choices_count() > 0) {
            return this.keydown_backstroke();
          } else if (!this.pending_backstroke) {
            this.result_clear_highlight();
            return this.results_search();
          }
          break;
        case 13:
          evt.preventDefault();
          if (this.results_showing) {
            return this.result_select(evt);
          }
          break;
        case 27:
          if (this.results_showing) {
            this.results_hide();
          }
          return true;
        case 9:
        case 38:
        case 40:
        case 16:
        case 91:
        case 17:
          break;
        default:
          return this.results_search();
      }
    };

    AbstractChosen.prototype.clipboard_event_checker = function(evt) {
      var _this = this;
      return setTimeout((function() {
        return _this.results_search();
      }), 50);
    };

    AbstractChosen.prototype.container_width = function() {
      if (this.options.width != null) {
        return this.options.width;
      } else {
        return "" + this.form_field.offsetWidth + "px";
      }
    };

    AbstractChosen.prototype.include_option_in_results = function(option) {
      if (this.is_multiple && (!this.display_selected_options && option.selected)) {
        return false;
      }
      if (!this.display_disabled_options && option.disabled) {
        return false;
      }
      if (option.empty) {
        return false;
      }
      return true;
    };

    AbstractChosen.prototype.search_results_touchstart = function(evt) {
      this.touch_started = true;
      return this.search_results_mouseover(evt);
    };

    AbstractChosen.prototype.search_results_touchmove = function(evt) {
      this.touch_started = false;
      return this.search_results_mouseout(evt);
    };

    AbstractChosen.prototype.search_results_touchend = function(evt) {
      if (this.touch_started) {
        return this.search_results_mouseup(evt);
      }
    };

    AbstractChosen.prototype.outerHTML = function(element) {
      var tmp;
      if (element.outerHTML) {
        return element.outerHTML;
      }
      tmp = document.createElement("div");
      tmp.appendChild(element);
      return tmp.innerHTML;
    };

    AbstractChosen.browser_is_supported = function() {
      if (window.navigator.appName === "Microsoft Internet Explorer") {
        return document.documentMode >= 8;
      }
      if (/iP(od|hone)/i.test(window.navigator.userAgent)) {
        return false;
      }
      if (/Android/i.test(window.navigator.userAgent)) {
        if (/Mobile/i.test(window.navigator.userAgent)) {
          return false;
        }
      }
      return true;
    };

    AbstractChosen.default_multiple_text = "Select Some Options";

    AbstractChosen.default_single_text = "Select an Option";

    AbstractChosen.default_no_result_text = "No results match";

    return AbstractChosen;

  })();

  this.Chosen = (function(_super) {
    __extends(Chosen, _super);

    function Chosen() {
      _ref = Chosen.__super__.constructor.apply(this, arguments);
      return _ref;
    }

    Chosen.prototype.setup = function() {
      this.current_selectedIndex = this.form_field.selectedIndex;
      return this.is_rtl = this.form_field.hasClassName("chosen-rtl");
    };

    Chosen.prototype.set_default_values = function() {
      Chosen.__super__.set_default_values.call(this);
      this.single_temp = new Template('<a class="chosen-single chosen-default" tabindex="-1"><span>#{default}</span><div><b></b></div></a><div class="chosen-drop"><div class="chosen-search"><input type="text" autocomplete="off" /></div><ul class="chosen-results"></ul></div>');
      this.multi_temp = new Template('<ul class="chosen-choices"><li class="search-field"><input type="text" value="#{default}" class="default" autocomplete="off" style="width:25px;" /></li></ul><div class="chosen-drop"><ul class="chosen-results"></ul></div>');
      return this.no_results_temp = new Template('<li class="no-results">' + this.results_none_found + ' "<span>#{terms}</span>"</li>');
    };

    Chosen.prototype.set_up_html = function() {
      var container_classes, container_props;
      container_classes = ["chosen-container"];
      container_classes.push("chosen-container-" + (this.is_multiple ? "multi" : "single"));
      if (this.inherit_select_classes && this.form_field.className) {
        container_classes.push(this.form_field.className);
      }
      if (this.is_rtl) {
        container_classes.push("chosen-rtl");
      }
      container_props = {
        'class': container_classes.join(' '),
        'style': "width: " + (this.container_width()) + ";",
        'title': this.form_field.title
      };
      if (this.form_field.id.length) {
        container_props.id = this.form_field.id.replace(/[^\w]/g, '_') + "_chosen";
      }
      this.container = this.is_multiple ? new Element('div', container_props).update(this.multi_temp.evaluate({
        "default": this.default_text
      })) : new Element('div', container_props).update(this.single_temp.evaluate({
        "default": this.default_text
      }));
      this.form_field.hide().insert({
        after: this.container
      });
      this.dropdown = this.container.down('div.chosen-drop');
      this.search_field = this.container.down('input');
      this.search_results = this.container.down('ul.chosen-results');
      this.search_field_scale();
      this.search_no_results = this.container.down('li.no-results');
      if (this.is_multiple) {
        this.search_choices = this.container.down('ul.chosen-choices');
        this.search_container = this.container.down('li.search-field');
      } else {
        this.search_container = this.container.down('div.chosen-search');
        this.selected_item = this.container.down('.chosen-single');
      }
      this.results_build();
      this.set_tab_index();
      this.set_label_behavior();
      return this.form_field.fire("chosen:ready", {
        chosen: this
      });
    };

    Chosen.prototype.register_observers = function() {
      var _this = this;
      this.container.observe("mousedown", function(evt) {
        return _this.container_mousedown(evt);
      });
      this.container.observe("mouseup", function(evt) {
        return _this.container_mouseup(evt);
      });
      this.container.observe("mouseenter", function(evt) {
        return _this.mouse_enter(evt);
      });
      this.container.observe("mouseleave", function(evt) {
        return _this.mouse_leave(evt);
      });
      this.search_results.observe("mouseup", function(evt) {
        return _this.search_results_mouseup(evt);
      });
      this.search_results.observe("mouseover", function(evt) {
        return _this.search_results_mouseover(evt);
      });
      this.search_results.observe("mouseout", function(evt) {
        return _this.search_results_mouseout(evt);
      });
      this.search_results.observe("mousewheel", function(evt) {
        return _this.search_results_mousewheel(evt);
      });
      this.search_results.observe("DOMMouseScroll", function(evt) {
        return _this.search_results_mousewheel(evt);
      });
      this.search_results.observe("touchstart", function(evt) {
        return _this.search_results_touchstart(evt);
      });
      this.search_results.observe("touchmove", function(evt) {
        return _this.search_results_touchmove(evt);
      });
      this.search_results.observe("touchend", function(evt) {
        return _this.search_results_touchend(evt);
      });
      this.form_field.observe("chosen:updated", function(evt) {
        return _this.results_update_field(evt);
      });
      this.form_field.observe("chosen:activate", function(evt) {
        return _this.activate_field(evt);
      });
      this.form_field.observe("chosen:open", function(evt) {
        return _this.container_mousedown(evt);
      });
      this.form_field.observe("chosen:close", function(evt) {
        return _this.input_blur(evt);
      });
      this.search_field.observe("blur", function(evt) {
        return _this.input_blur(evt);
      });
      this.search_field.observe("keyup", function(evt) {
        return _this.keyup_checker(evt);
      });
      this.search_field.observe("keydown", function(evt) {
        return _this.keydown_checker(evt);
      });
      this.search_field.observe("focus", function(evt) {
        return _this.input_focus(evt);
      });
      this.search_field.observe("cut", function(evt) {
        return _this.clipboard_event_checker(evt);
      });
      this.search_field.observe("paste", function(evt) {
        return _this.clipboard_event_checker(evt);
      });
      if (this.is_multiple) {
        return this.search_choices.observe("click", function(evt) {
          return _this.choices_click(evt);
        });
      } else {
        return this.container.observe("click", function(evt) {
          return evt.preventDefault();
        });
      }
    };

    Chosen.prototype.destroy = function() {
      this.container.ownerDocument.stopObserving("click", this.click_test_action);
      this.form_field.stopObserving();
      this.container.stopObserving();
      this.search_results.stopObserving();
      this.search_field.stopObserving();
      if (this.form_field_label != null) {
        this.form_field_label.stopObserving();
      }
      if (this.is_multiple) {
        this.search_choices.stopObserving();
        this.container.select(".search-choice-close").each(function(choice) {
          return choice.stopObserving();
        });
      } else {
        this.selected_item.stopObserving();
      }
      if (this.search_field.tabIndex) {
        this.form_field.tabIndex = this.search_field.tabIndex;
      }
      this.container.remove();
      return this.form_field.show();
    };

    Chosen.prototype.search_field_disabled = function() {
      this.is_disabled = this.form_field.disabled;
      if (this.is_disabled) {
        this.container.addClassName('chosen-disabled');
        this.search_field.disabled = true;
        if (!this.is_multiple) {
          this.selected_item.stopObserving("focus", this.activate_action);
        }
        return this.close_field();
      } else {
        this.container.removeClassName('chosen-disabled');
        this.search_field.disabled = false;
        if (!this.is_multiple) {
          return this.selected_item.observe("focus", this.activate_action);
        }
      }
    };

    Chosen.prototype.container_mousedown = function(evt) {
      if (!this.is_disabled) {
        if (evt && evt.type === "mousedown" && !this.results_showing) {
          evt.stop();
        }
        if (!((evt != null) && evt.target.hasClassName("search-choice-close"))) {
          if (!this.active_field) {
            if (this.is_multiple) {
              this.search_field.clear();
            }
            this.container.ownerDocument.observe("click", this.click_test_action);
            this.results_show();
          } else if (!this.is_multiple && evt && (evt.target === this.selected_item || evt.target.up("a.chosen-single"))) {
            this.results_toggle();
          }
          return this.activate_field();
        }
      }
    };

    Chosen.prototype.container_mouseup = function(evt) {
      if (evt.target.nodeName === "ABBR" && !this.is_disabled) {
        return this.results_reset(evt);
      }
    };

    Chosen.prototype.search_results_mousewheel = function(evt) {
      var delta;
      delta = -evt.wheelDelta || evt.detail;
      if (delta != null) {
        evt.preventDefault();
        if (evt.type === 'DOMMouseScroll') {
          delta = delta * 40;
        }
        return this.search_results.scrollTop = delta + this.search_results.scrollTop;
      }
    };

    Chosen.prototype.blur_test = function(evt) {
      if (!this.active_field && this.container.hasClassName("chosen-container-active")) {
        return this.close_field();
      }
    };

    Chosen.prototype.close_field = function() {
      this.container.ownerDocument.stopObserving("click", this.click_test_action);
      this.active_field = false;
      this.results_hide();
      this.container.removeClassName("chosen-container-active");
      this.clear_backstroke();
      this.show_search_field_default();
      return this.search_field_scale();
    };

    Chosen.prototype.activate_field = function() {
      this.container.addClassName("chosen-container-active");
      this.active_field = true;
      this.search_field.value = this.search_field.value;
      return this.search_field.focus();
    };

    Chosen.prototype.test_active_click = function(evt) {
      if (evt.target.up('.chosen-container') === this.container) {
        return this.active_field = true;
      } else {
        return this.close_field();
      }
    };

    Chosen.prototype.results_build = function() {
      this.parsing = true;
      this.selected_option_count = null;
      this.results_data = SelectParser.select_to_array(this.form_field);
      if (this.is_multiple) {
        this.search_choices.select("li.search-choice").invoke("remove");
      } else if (!this.is_multiple) {
        this.single_set_selected_text();
        if (this.disable_search || this.form_field.options.length <= this.disable_search_threshold) {
          this.search_field.readOnly = true;
          this.container.addClassName("chosen-container-single-nosearch");
        } else {
          this.search_field.readOnly = false;
          this.container.removeClassName("chosen-container-single-nosearch");
        }
      }
      this.update_results_content(this.results_option_build({
        first: true
      }));
      this.search_field_disabled();
      this.show_search_field_default();
      this.search_field_scale();
      return this.parsing = false;
    };

    Chosen.prototype.result_do_highlight = function(el) {
      var high_bottom, high_top, maxHeight, visible_bottom, visible_top;
      this.result_clear_highlight();
      this.result_highlight = el;
      this.result_highlight.addClassName("highlighted");
      maxHeight = parseInt(this.search_results.getStyle('maxHeight'), 10);
      visible_top = this.search_results.scrollTop;
      visible_bottom = maxHeight + visible_top;
      high_top = this.result_highlight.positionedOffset().top;
      high_bottom = high_top + this.result_highlight.getHeight();
      if (high_bottom >= visible_bottom) {
        return this.search_results.scrollTop = (high_bottom - maxHeight) > 0 ? high_bottom - maxHeight : 0;
      } else if (high_top < visible_top) {
        return this.search_results.scrollTop = high_top;
      }
    };

    Chosen.prototype.result_clear_highlight = function() {
      if (this.result_highlight) {
        this.result_highlight.removeClassName('highlighted');
      }
      return this.result_highlight = null;
    };

    Chosen.prototype.results_show = function() {
      if (this.is_multiple && this.max_selected_options <= this.choices_count()) {
        this.form_field.fire("chosen:maxselected", {
          chosen: this
        });
        return false;
      }
      this.container.addClassName("chosen-with-drop");
      this.results_showing = true;
      this.search_field.focus();
      this.search_field.value = this.search_field.value;
      this.winnow_results();
      return this.form_field.fire("chosen:showing_dropdown", {
        chosen: this
      });
    };

    Chosen.prototype.update_results_content = function(content) {
      return this.search_results.update(content);
    };

    Chosen.prototype.results_hide = function() {
      if (this.results_showing) {
        this.result_clear_highlight();
        this.container.removeClassName("chosen-with-drop");
        this.form_field.fire("chosen:hiding_dropdown", {
          chosen: this
        });
      }
      return this.results_showing = false;
    };

    Chosen.prototype.set_tab_index = function(el) {
      var ti;
      if (this.form_field.tabIndex) {
        ti = this.form_field.tabIndex;
        this.form_field.tabIndex = -1;
        return this.search_field.tabIndex = ti;
      }
    };

    Chosen.prototype.set_label_behavior = function() {
      var _this = this;
      this.form_field_label = this.form_field.up("label");
      if (this.form_field_label == null) {
        this.form_field_label = $$("label[for='" + this.form_field.id + "']").first();
      }
      if (this.form_field_label != null) {
        return this.form_field_label.observe("click", function(evt) {
          if (_this.is_multiple) {
            return _this.container_mousedown(evt);
          } else {
            return _this.activate_field();
          }
        });
      }
    };

    Chosen.prototype.show_search_field_default = function() {
      if (this.is_multiple && this.choices_count() < 1 && !this.active_field) {
        this.search_field.value = this.default_text;
        return this.search_field.addClassName("default");
      } else {
        this.search_field.value = "";
        return this.search_field.removeClassName("default");
      }
    };

    Chosen.prototype.search_results_mouseup = function(evt) {
      var target;
      target = evt.target.hasClassName("active-result") ? evt.target : evt.target.up(".active-result");
      if (target) {
        this.result_highlight = target;
        this.result_select(evt);
        return this.search_field.focus();
      }
    };

    Chosen.prototype.search_results_mouseover = function(evt) {
      var target;
      target = evt.target.hasClassName("active-result") ? evt.target : evt.target.up(".active-result");
      if (target) {
        return this.result_do_highlight(target);
      }
    };

    Chosen.prototype.search_results_mouseout = function(evt) {
      if (evt.target.hasClassName('active-result') || evt.target.up('.active-result')) {
        return this.result_clear_highlight();
      }
    };

    Chosen.prototype.choice_build = function(item) {
      var choice, close_link,
        _this = this;
      choice = new Element('li', {
        "class": "search-choice"
      }).update("<span>" + item.html + "</span>");
      if (item.disabled) {
        choice.addClassName('search-choice-disabled');
      } else {
        close_link = new Element('a', {
          href: '#',
          "class": 'search-choice-close',
          rel: item.array_index
        });
        close_link.observe("click", function(evt) {
          return _this.choice_destroy_link_click(evt);
        });
        choice.insert(close_link);
      }
      return this.search_container.insert({
        before: choice
      });
    };

    Chosen.prototype.choice_destroy_link_click = function(evt) {
      evt.preventDefault();
      evt.stopPropagation();
      if (!this.is_disabled) {
        return this.choice_destroy(evt.target);
      }
    };

    Chosen.prototype.choice_destroy = function(link) {
      if (this.result_deselect(link.readAttribute("rel"))) {
        this.show_search_field_default();
        if (this.is_multiple && this.choices_count() > 0 && this.search_field.value.length < 1) {
          this.results_hide();
        }
        link.up('li').remove();
        return this.search_field_scale();
      }
    };

    Chosen.prototype.results_reset = function() {
      this.reset_single_select_options();
      this.form_field.options[0].selected = true;
      this.single_set_selected_text();
      this.show_search_field_default();
      this.results_reset_cleanup();
      if (typeof Event.simulate === 'function') {
        this.form_field.simulate("change");
      }
      if (this.active_field) {
        return this.results_hide();
      }
    };

    Chosen.prototype.results_reset_cleanup = function() {
      var deselect_trigger;
      this.current_selectedIndex = this.form_field.selectedIndex;
      deselect_trigger = this.selected_item.down("abbr");
      if (deselect_trigger) {
        return deselect_trigger.remove();
      }
    };

    Chosen.prototype.result_select = function(evt) {
      var high, item;
      if (this.result_highlight) {
        high = this.result_highlight;
        this.result_clear_highlight();
        if (this.is_multiple && this.max_selected_options <= this.choices_count()) {
          this.form_field.fire("chosen:maxselected", {
            chosen: this
          });
          return false;
        }
        if (this.is_multiple) {
          high.removeClassName("active-result");
        } else {
          this.reset_single_select_options();
        }
        high.addClassName("result-selected");
        item = this.results_data[high.getAttribute("data-option-array-index")];
        item.selected = true;
        this.form_field.options[item.options_index].selected = true;
        this.selected_option_count = null;
        if (this.is_multiple) {
          this.choice_build(item);
        } else {
          this.single_set_selected_text(item.text);
        }
        if (!((evt.metaKey || evt.ctrlKey) && this.is_multiple)) {
          this.results_hide();
        }
        this.search_field.value = "";
        if (typeof Event.simulate === 'function' && (this.is_multiple || this.form_field.selectedIndex !== this.current_selectedIndex)) {
          this.form_field.simulate("change");
        }
        this.current_selectedIndex = this.form_field.selectedIndex;
        return this.search_field_scale();
      }
    };

    Chosen.prototype.single_set_selected_text = function(text) {
      if (text == null) {
        text = this.default_text;
      }
      if (text === this.default_text) {
        this.selected_item.addClassName("chosen-default");
      } else {
        this.single_deselect_control_build();
        this.selected_item.removeClassName("chosen-default");
      }
      return this.selected_item.down("span").update(text);
    };

    Chosen.prototype.result_deselect = function(pos) {
      var result_data;
      result_data = this.results_data[pos];
      if (!this.form_field.options[result_data.options_index].disabled) {
        result_data.selected = false;
        this.form_field.options[result_data.options_index].selected = false;
        this.selected_option_count = null;
        this.result_clear_highlight();
        if (this.results_showing) {
          this.winnow_results();
        }
        if (typeof Event.simulate === 'function') {
          this.form_field.simulate("change");
        }
        this.search_field_scale();
        return true;
      } else {
        return false;
      }
    };

    Chosen.prototype.single_deselect_control_build = function() {
      if (!this.allow_single_deselect) {
        return;
      }
      if (!this.selected_item.down("abbr")) {
        this.selected_item.down("span").insert({
          after: "<abbr class=\"search-choice-close\"></abbr>"
        });
      }
      return this.selected_item.addClassName("chosen-single-with-deselect");
    };

    Chosen.prototype.get_search_text = function() {
      if (this.search_field.value === this.default_text) {
        return "";
      } else {
        return this.search_field.value.strip().escapeHTML();
      }
    };

    Chosen.prototype.winnow_results_set_highlight = function() {
      var do_high;
      if (!this.is_multiple) {
        do_high = this.search_results.down(".result-selected.active-result");
      }
      if (do_high == null) {
        do_high = this.search_results.down(".active-result");
      }
      if (do_high != null) {
        return this.result_do_highlight(do_high);
      }
    };

    Chosen.prototype.no_results = function(terms) {
      this.search_results.insert(this.no_results_temp.evaluate({
        terms: terms
      }));
      return this.form_field.fire("chosen:no_results", {
        chosen: this
      });
    };

    Chosen.prototype.no_results_clear = function() {
      var nr, _results;
      nr = null;
      _results = [];
      while (nr = this.search_results.down(".no-results")) {
        _results.push(nr.remove());
      }
      return _results;
    };

    Chosen.prototype.keydown_arrow = function() {
      var next_sib;
      if (this.results_showing && this.result_highlight) {
        next_sib = this.result_highlight.next('.active-result');
        if (next_sib) {
          return this.result_do_highlight(next_sib);
        }
      } else {
        return this.results_show();
      }
    };

    Chosen.prototype.keyup_arrow = function() {
      var actives, prevs, sibs;
      if (!this.results_showing && !this.is_multiple) {
        return this.results_show();
      } else if (this.result_highlight) {
        sibs = this.result_highlight.previousSiblings();
        actives = this.search_results.select("li.active-result");
        prevs = sibs.intersect(actives);
        if (prevs.length) {
          return this.result_do_highlight(prevs.first());
        } else {
          if (this.choices_count() > 0) {
            this.results_hide();
          }
          return this.result_clear_highlight();
        }
      }
    };

    Chosen.prototype.keydown_backstroke = function() {
      var next_available_destroy;
      if (this.pending_backstroke) {
        this.choice_destroy(this.pending_backstroke.down("a"));
        return this.clear_backstroke();
      } else {
        next_available_destroy = this.search_container.siblings().last();
        if (next_available_destroy && next_available_destroy.hasClassName("search-choice") && !next_available_destroy.hasClassName("search-choice-disabled")) {
          this.pending_backstroke = next_available_destroy;
          if (this.pending_backstroke) {
            this.pending_backstroke.addClassName("search-choice-focus");
          }
          if (this.single_backstroke_delete) {
            return this.keydown_backstroke();
          } else {
            return this.pending_backstroke.addClassName("search-choice-focus");
          }
        }
      }
    };

    Chosen.prototype.clear_backstroke = function() {
      if (this.pending_backstroke) {
        this.pending_backstroke.removeClassName("search-choice-focus");
      }
      return this.pending_backstroke = null;
    };

    Chosen.prototype.keydown_checker = function(evt) {
      var stroke, _ref1;
      stroke = (_ref1 = evt.which) != null ? _ref1 : evt.keyCode;
      this.search_field_scale();
      if (stroke !== 8 && this.pending_backstroke) {
        this.clear_backstroke();
      }
      switch (stroke) {
        case 8:
          this.backstroke_length = this.search_field.value.length;
          break;
        case 9:
          if (this.results_showing && !this.is_multiple) {
            this.result_select(evt);
          }
          this.mouse_on_container = false;
          break;
        case 13:
          evt.preventDefault();
          break;
        case 38:
          evt.preventDefault();
          this.keyup_arrow();
          break;
        case 40:
          evt.preventDefault();
          this.keydown_arrow();
          break;
      }
    };

    Chosen.prototype.search_field_scale = function() {
      var div, f_width, h, style, style_block, styles, w, _i, _len;
      if (this.is_multiple) {
        h = 0;
        w = 0;
        style_block = "position:absolute; left: -1000px; top: -1000px; display:none;";
        styles = ['font-size', 'font-style', 'font-weight', 'font-family', 'line-height', 'text-transform', 'letter-spacing'];
        for (_i = 0, _len = styles.length; _i < _len; _i++) {
          style = styles[_i];
          style_block += style + ":" + this.search_field.getStyle(style) + ";";
        }
        div = new Element('div', {
          'style': style_block
        }).update(this.search_field.value.escapeHTML());
        document.body.appendChild(div);
        w = Element.measure(div, 'width') + 25;
        div.remove();
        f_width = this.container.getWidth();
        if (w > f_width - 10) {
          w = f_width - 10;
        }
        return this.search_field.setStyle({
          'width': w + 'px'
        });
      }
    };

    return Chosen;

  })(AbstractChosen);

}).call(this);