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✏️ Editing: jquery.dropdown.js

;
(function ($) {
  'use strict';

function noop() { }

var isSafari = function () {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.indexOf('safari') !== -1) {
      return ua.indexOf('chrome') > -1 ? false : true;
    }
  }();

var settings = {
    readonly: false,
    minCount: 0,
    minCountErrorMessage: '',
    limitCount: Infinity,
    limitCountErrorMessage: '',
    input: '<input type="text" maxLength="20" placeholder="Search...">',
    data: [],
    searchable: true,
    searchNoData: '<li style="color:#ddd">No Results.</li>',
    init: noop,
    choice: noop,
    extendProps: []
  };

var KEY_CODE = {
    up: 38,
    down: 40,
    enter: 13
  };

var EVENT_SPACE = {
    click: 'click.iui-dropdown',
    focus: 'focus.iui-dropdown',
    keydown: 'keydown.iui-dropdown',
    keyup: 'keyup.iui-dropdown'
  };

var ALERT_TIMEOUT_PERIOD = 1000;

// 创建模板
  function createTemplate() {
    var isLabelMode = this.isLabelMode;
    var searchable = this.config.searchable;
    var templateSearch = searchable ? '<span class="dropdown-search">' + this.config.input + '</span>' : '';

return isLabelMode ? '<div class="dropdown-display-label"><div class="dropdown-chose-list">' + templateSearch + '</div></div><div class="dropdown-main">{{ul}}</div>' : '<a href="javascript:;" class="dropdown-display" tabindex="0"><span class="dropdown-chose-list"></span><a href="javascript:;"  class="dropdown-clear-all" tabindex="0">\xD7</a></a><div class="dropdown-main">' + templateSearch + '{{ul}}</div>';
  }

// 小于minCount提示的元素
  function minItemsAlert() {
    var _dropdown = this;
    var _config = _dropdown.config;
    var $el = _dropdown.$el;
    var $alert = $el.find('.dropdown-minItem-alert');
    var alertMessage = _config.minCountErrorMessage;
    clearTimeout(_dropdown.itemCountAlertTimer);

if ($alert.length === 0) {
      if (!alertMessage) {
        alertMessage = '\u6700\u4f4e\u9009\u62e9' + _config.minCount + '\u4E2A';
      }
      $alert = $('<div class="dropdown-minItem-alert">' + alertMessage + '</div>');
    }

$el.append($alert);
    _dropdown.itemCountAlertTimer = setTimeout(function () {
      $el.find('.dropdown-minItem-alert').remove();
    }, ALERT_TIMEOUT_PERIOD);
  }

// 超出限制提示
  function maxItemAlert() {
    var _dropdown = this;
    var _config = _dropdown.config;
    var $el = _dropdown.$el;
    var $alert = $el.find('.dropdown-maxItem-alert');
    var alertMessage = _config.limitCountErrorMessage;
    clearTimeout(_dropdown.itemLimitAlertTimer);

if ($alert.length === 0) {
      if (!alertMessage) {
        alertMessage = '\u6700\u591A\u53EF\u9009\u62E9' + _config.limitCount + '\u4E2A';
      }
      $alert = $('<div class="dropdown-maxItem-alert">' + alertMessage + '</div>');
    }

$el.append($alert);
    _dropdown.itemLimitAlertTimer = setTimeout(function () {
      $el.find('.dropdown-maxItem-alert').remove();
    }, ALERT_TIMEOUT_PERIOD);
  }

// select-option 转 ul-li
  function selectToDiv(str) {
    var result = str || '';
    // 移除select标签
    result = result.replace(/<select[^>]*>/gi, '').replace('</select>', '');
    // 移除 optgroup 结束标签
    result = result.replace(/<\/optgroup>/gi, '');
    result = result.replace(/<optgroup[^>]*>/gi, function (matcher) {
      var groupName = /label="(.[^"]*)"(\s|>)/.exec(matcher);
      var groupId = /data\-group\-id="(.[^"]*)"(\s|>)/.exec(matcher);
      return '<li class="dropdown-group" data-group-id="' + (groupId ? groupId[1] : '') + '">' + (groupName ? groupName[1] : '') + '</li>';
    });
    result = result.replace(/<option(.*?)<\/option>/gi, function (matcher) {
      // var value = /value="?([\w\u4E00-\u9FA5\uF900-\uFA2D]+)"?/.exec(matcher);
      var value = $(matcher).val();
      var name = />(.*)<\//.exec(matcher);
      // 强制要求html中使用selected/disabled，而不是selected="selected","disabled="disabled"
      var isSelected = matcher.indexOf('selected') > -1 ? true : false;
      var isDisabled = matcher.indexOf('disabled') > -1 ? true : false;
      var extendAttr = ''
      var extendProps = matcher.replace(/data-(\w+)="?(.[^"]+)"?/g, function ($1) {
        extendAttr += $1 + ' '
      });
      return '<li ' + (isDisabled ? ' disabled' : ' tabindex="0"') + ' data-value="' + (value || '') + '" class="dropdown-option ' + (isSelected ? 'dropdown-chose' : '') + '" ' + extendAttr + '>' + (name ? name[1] : '') + '</li>';
    });

return result;
  }

// object-data 转 select-option
  function objectToSelect(data) {
    var dropdown = this;
    var map = {};
    var result = '';
    var name = [];
    var selectAmount = 0;
    var extendProps = dropdown.config.extendProps;

if (!data || !data.length) {
      return false;
    }

$.each(data, function (index, val) {
      // disable 权重高于 selected
      var hasGroup = val.groupId;
      var isDisabled = val.disabled ? ' disabled' : '';
      var isSelected = val.selected && !isDisabled ? ' selected' : '';
      var extendAttr = ''
      $.each(extendProps, function (index, value) {
        if (val[value]) {
          extendAttr += 'data-' + value + '="' + val[value] + '" '
        }
      })
      var temp = '<option' + isDisabled + isSelected + ' value="' + val.id + '" ' + extendAttr + '>' + val.name + '</option>';
      if (isSelected) {
        name.push('<span class="dropdown-selected">' + val.name + '<i class="del" data-id="' + val.id + '"></i></span>');
        selectAmount++;
      }
      // 判断是否有分组
      if (hasGroup) {
        if (map[val.groupId]) {
          map[val.groupId] += temp;
        } else {
          //  &janking& just a separator
          map[val.groupId] = val.groupName + '&janking&' + temp;
        }
      } else {
        map[index] = temp;
      }
    });

$.each(map, function (index, val) {
      var option = val.split('&janking&');
      // 判断是否有分组
      if (option.length === 2) {
        var groupName = option[0];
        var items = option[1];
        result += '<optgroup label="' + groupName + '" data-group-id="' + index + '">' + items + '</optgroup>';
      } else {
        result += val;
      }
    });

return [result, name, selectAmount];
  }

// select-option 转 object-data
  //
  function selectToObject(el) {
    var $select = el;
    var result = [];

function readOption(key, el) {
      var $option = $(el);
      this.id = $option.prop('value');
      this.name = $option.text();
      this.disabled = $option.prop('disabled');
      this.selected = $option.prop('selected');
    }

$.each($select.children(), function (key, el) {
      var tmp = {};
      var tmpGroup = {};
      var $el = $(el);
      if (el.nodeName === 'OPTGROUP') {
        tmpGroup.groupId = $el.data('groupId');
        tmpGroup.groupName = $el.attr('label');
        $.each($el.children(), $.proxy(readOption, tmp));
        $.extend(tmp, tmpGroup);
      } else {
        $.each($el, $.proxy(readOption, tmp));
      }
      result.push(tmp);
    });

return result;
  }

if ($target.hasClass('dropdown-display')) {
        return false;
      }

if (hasSelected) {
        $target.removeClass('dropdown-chose');
        _dropdown.selectAmount--;
      } else {
        if (_dropdown.selectAmount < _config.limitCount) {
          $target.addClass('dropdown-chose');
          _dropdown.selectAmount++;
        } else {
          maxItemAlert.call(_dropdown);
          return false;
        }
      }

_dropdown.name = [];

$.each(_config.data, function (key, item) {
        if ('' + item.id === '' + value) {
          selectedProp = item;
          item.selected = hasSelected ? false : true;
        }
        if (item.selected) {
          selectedName.push(item.name);
          _dropdown.name.push('<span class="dropdown-selected">' + item.name + '<i class="del" data-id="' + item.id + '"></i></span>');
        }
      });

$select.find('option[value="' + value + '"]').prop('selected', hasSelected ? false : true);

if (hasSelected && _dropdown.selectAmount < _config.minCount) {
        minItemsAlert.call(_dropdown);
      }

_dropdown.$choseList.find('.dropdown-selected').remove();
      _dropdown.$choseList.prepend(_dropdown.name.join(''));
      _dropdown.$el.find('.dropdown-display').attr('title', selectedName.join(','));
      _config.choice.call(_dropdown, event, selectedProp);
    },
    singleChoose: function (event) {
      var _dropdown = this;
      var _config = _dropdown.config;
      var $el = _dropdown.$el;
      var $select = _dropdown.$select;
      var $target = $(event.target);
      var value = $target.attr('data-value');
      var hasSelected = $target.hasClass('dropdown-chose');

if ($target.hasClass('dropdown-chose') || $target.hasClass('dropdown-display')) {
        return false;
      }

_dropdown.name = [];

$el.removeClass('active').find('li').not($target).removeClass('dropdown-chose');

$target.toggleClass('dropdown-chose');
      $.each(_config.data, function (key, item) {
        // id 有可能是数字也有可能是字符串，强制全等有弊端 2017-03-20 22:19:21
        item.selected = false;
        if ('' + item.id === '' + value) {
          item.selected = hasSelected ? 0 : 1;
          if (item.selected) {
            _dropdown.name.push('<span class="dropdown-selected">' + item.name + '<i class="del" data-id="' + item.id + '"></i></span>');
          }
        }
      });

$select.find('option[value="' + value + '"]').prop('selected', true);

_dropdown.name.push('<span class="placeholder">' + _dropdown.placeholder + '</span>');
      _dropdown.$choseList.html(_dropdown.name.join(''));
      _config.choice.call(_dropdown, event);
    },
    del: function (event) {
      var _dropdown = this;
      var _config = _dropdown.config;
      var $target = $(event.target);
      var id = $target.data('id');
      // 2017-03-23 15:58:50 测试
      // 10000条数据测试删除，耗时 ~3ms
      $.each(_dropdown.name, function (key, value) {
        if (value.indexOf('data-id="' + id + '"') !== -1) {
          _dropdown.name.splice(key, 1);
          return false;
        }
      });

$.each(_dropdown.config.data, function (key, item) {
        if ('' + item.id == '' + id) {
          item.selected = false;
          return false;
        }
      });

_dropdown.selectAmount--;
      _dropdown.$el.find('[data-value="' + id + '"]').removeClass('dropdown-chose');
      _dropdown.$el.find('[value="' + id + '"]').prop('selected', false).removeAttr('selected');
      $target.closest('.dropdown-selected').remove();
      _config.choice.call(_dropdown, event);

return false;
    },
    clearAll: function (event) {
      var _dropdown = this;
      var _config = _dropdown.config;
      event && event.preventDefault();
      console.log(this)
      this.$choseList.find('.del').each(function (index, el) {
        $(el).trigger('click');
      });

if (_config.minCount > 0) {
        minItemsAlert.call(_dropdown);
      }

this.$el.find('.dropdown-display').removeAttr('title');
      return false;
    }
  };

function Dropdown(options, el) {
    this.$el = $(el);
    this.$select = this.$el.find('select');
    this.placeholder = this.$select.attr('placeholder');
    this.config = options;
    this.name = [];
    this.isSingleSelect = !this.$select.prop('multiple');
    this.selectAmount = 0;
    this.itemLimitAlertTimer = null;
    this.isLabelMode = this.config.multipleMode === 'label';
    this.init();
  }

Dropdown.prototype = {
    init: function () {
      var _this = this;
      var _config = _this.config;
      var $el = _this.$el;
      _this.$select.hide();
      //  判断dropdown是否单选，是否token模式
      $el.addClass(_this.isSingleSelect ? 'dropdown-single' : _this.isLabelMode ? 'dropdown-multiple-label' : 'dropdown-multiple');

if (_config.data.length === 0) {
        _config.data = selectToObject(_this.$select);
      }

var processResult = objectToSelect.call(_this, _config.data);

_this.name = processResult[1];
      _this.selectAmount = processResult[2];
      _this.$select.html(processResult[0]);
      _this.renderSelect();
      // disabled权重高于readonly
      _this.changeStatus(_config.disabled ? 'disabled' : _config.readonly ? 'readonly' : false);

_this.config.init();
    },
    // 渲染 select 为 dropdown
    renderSelect: function (isUpdate, isCover) {
      var _this = this;
      var $el = _this.$el;
      var $select = _this.$select;
      var elemLi = selectToDiv($select.prop('outerHTML'));
      var template;

if (isUpdate) {
        $el.find('ul')[isCover ? 'html' : 'append'](elemLi);
      } else {
        template = createTemplate.call(_this).replace('{{ul}}', '<ul>' + elemLi + '</ul>');
        $el.append(template).find('ul').removeAttr('style class');
      }

if (isCover) {
        _this.name = [];
        _this.$el.find('.dropdown-selected').remove();
        _this.$select.val('');
      }

_this.$choseList = $el.find('.dropdown-chose-list');

if (!_this.isLabelMode) {
        _this.$choseList.html($('<span class="placeholder"></span>').text(_this.placeholder));
      }

_this.$choseList.prepend(_this.name ? _this.name.join('') : []);
    },
    bindEvent: function () {
      var _this = this;
      var $el = _this.$el;
      var openHandle = isSafari ? EVENT_SPACE.click : EVENT_SPACE.focus;

$el.on(EVENT_SPACE.click, function (event) {
        event.stopPropagation();
      });

$el.on(EVENT_SPACE.click, '.del', $.proxy(action.del, _this));

// show
      if (_this.isLabelMode) {
        $el.on(EVENT_SPACE.click, '.dropdown-display-label', function () {
          $el.find('input').focus();
        });
        if (_this.config.searchable) {
          $el.on(EVENT_SPACE.focus, 'input', $.proxy(action.show, _this));
        } else {
          $el.on(EVENT_SPACE.click, $.proxy(action.show, _this));
        }
        $el.on(EVENT_SPACE.keydown, 'input', function (event) {
          if (event.keyCode === 8 && this.value === '' && _this.name.length) {
            $el.find('.del').eq(-1).trigger('click');
          }
        });
      } else {
        $el.on(openHandle, '.dropdown-display', $.proxy(action.show, _this));
        $el.on(openHandle, '.dropdown-clear-all', $.proxy(action.clearAll, _this));
      }

// 搜索
      $el.on(EVENT_SPACE.keyup, 'input', $.proxy(action.search, _this));

// 按下enter键设置token
      $el.on(EVENT_SPACE.keyup, function (event) {
        var keyCode = event.keyCode;
        var KC = KEY_CODE;
        if (keyCode === KC.enter) {
          $.proxy(_this.isSingleSelect ? action.singleChoose : action.multiChoose, _this, event)();
        }
      });

// 按下上下键切换token
      $el.on(EVENT_SPACE.keydown, $.proxy(action.control, _this));

$el.on(EVENT_SPACE.click, 'li[tabindex]', $.proxy(_this.isSingleSelect ? action.singleChoose : action.multiChoose, _this));
    },
    unbindEvent: function () {
      var _this = this;
      var $el = _this.$el;
      var openHandle = isSafari ? EVENT_SPACE.click : EVENT_SPACE.focus;

$el.off(EVENT_SPACE.click);
      $el.off(EVENT_SPACE.click, '.del');

// show
      if (_this.isLabelMode) {
        $el.off(EVENT_SPACE.click, '.dropdown-display-label');
        $el.off(EVENT_SPACE.focus, 'input');
        $el.off(EVENT_SPACE.keydown, 'input');
      } else {
        $el.off(openHandle, '.dropdown-display');
        $el.off(openHandle, '.dropdown-clear-all');
      }
      // 搜索
      $el.off(EVENT_SPACE.keyup, 'input');
      // 按下enter键设置token
      $el.off(EVENT_SPACE.keyup);
      // 按下上下键切换token
      $el.off(EVENT_SPACE.keydown);
      $el.off(EVENT_SPACE.click, '[tabindex]');
    },
    changeStatus: function (status) {
      var _this = this;
      if (status === 'readonly') {
        _this.unbindEvent();
      } else if (status === 'disabled') {
        _this.$select.prop('disabled', true);
        _this.unbindEvent();
      } else {
        _this.$select.prop('disabled', false);
        _this.bindEvent();
      }
    },
    update: function (data, isCover) {
      var _this = this;
      var _config = _this.config;
      var $el = _this.$el;
      var _isCover = isCover || false;

if (Object.prototype.toString.call(data) !== '[object Array]') {
        return;
      }

_config.data = _isCover ? data.slice(0) : _config.data.concat(data);

var processResult = objectToSelect.call(_this, _config.data);

_this.name = processResult[1];
      _this.selectAmount = processResult[2];
      _this.$select.html(processResult[0]);
      _this.renderSelect(true, _isCover);
    },
    destroy: function () {
      this.unbindEvent();
      this.$el.children().not('select').remove();
      this.$el.removeClass('dropdown-single dropdown-multiple-label dropdown-multiple');
      this.$select.show();
    },
    choose: function (values, status) {
      var valArr = Object.prototype.toString.call(values) === '[object Array]' ? values : [values];
      var _this = this;
      var _status = status !== void 0 ? !!status : true
      $.each(valArr, function (index, value) {
        var $target = _this.$el.find('[data-value="' + value + '"]');
        var targetStatus = $target.hasClass('dropdown-chose');
        if (targetStatus !== _status) {
          $target.trigger(EVENT_SPACE.click, status || true)
        }
      });
    },
    reset: function () {
      action.clearAll.call(this)
    }
  };

$(document).on('click.dropdown', function () {
    $('.dropdown-single,.dropdown-multiple,.dropdown-multiple-label').removeClass('active');
  });

$.fn.dropdown = function (options) {
    this.each(function (index, el) {
      $(el).data('dropdown', new Dropdown($.extend(true, {}, settings, options), el));
    });
    return this;
  }
})(jQuery);

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