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Filename : jq.tablesort.js
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/*
 * jq.TableSort -- jQuery Table sorter Plug-in.
 *
 * Version 1.0.0.
 *
 * Copyright (c) 2017 Dmitry Zavodnikov.
 *
 * Licensed under the MIT License.
 */
(function($) {
  'use strict';
  var SORT = 'sort';
  var ASC = 'asc';
  var DESC = 'desc';
  var UNSORT = 'unsort';

  var config = {
    defaultColumn: 0,
    defaultOrder: 'asc',
    styles: {
      'sort': 'sortStyle',
      'asc': 'ascStyle',
      'desc': 'descStyle',
      'unsort': 'unsortStyle'
    },
    selector: function(tableBody, column) {
      var groups = [];

      var tableRows = $(tableBody).find('tr');
      for (var i = 0; i < tableRows.length; i++) {
        var td = $(tableRows[i]).find('td')[column];

        groups.push({
          'values': [tableRows[i]],
          'key': $(td).text()
        });
      }
      return groups;
    },
    comparator: function(group1, group2) {
      return group1.key.localeCompare(group2.key);
    }
  };

  function getTableHeaders(table) {
    return $(table).find('thead > tr > th');
  }

  function getSortableTableHeaders(table) {
    return getTableHeaders(table).filter(function(index) {
      return $(this).hasClass(config.styles[SORT]);
    });
  }

  function changeOrder(table, column) {
    var sortedHeader = getTableHeaders(table).filter(function(index) {
      return $(this).hasClass(config.styles[ASC]) || $(this).hasClass(config.styles[DESC]);
    });

    var sordOrder = config.defaultOrder;
    if (sortedHeader.hasClass(config.styles[ASC])) {
      sordOrder = ASC;
    }
    if (sortedHeader.hasClass(config.styles[DESC])) {
      sordOrder = DESC;
    }

    var th = getTableHeaders(table)[column];

    if (th === sortedHeader[0]) {
      if (sordOrder === ASC) {
        sordOrder = DESC;
      } else {
        sordOrder = ASC;
      }
    }

    var headers = getSortableTableHeaders(table);
    headers.removeClass(config.styles[ASC]);
    headers.removeClass(config.styles[DESC]);
    headers.addClass(config.styles[UNSORT]);

    $(th).removeClass(config.styles[UNSORT]);
    $(th).addClass(config.styles[sordOrder]);

    var tbody = $(table).find('tbody')[0];
    var groups = config.selector(tbody, column);

    // Sorting.
    groups.sort(function(a, b) {
      var res = config.comparator(a, b);
      return sordOrder === ASC ? res : -1 * res;
    });

    for (var i = 0; i < groups.length; i++) {
      var trList = groups[i];
      var trListValues = trList.values;
      for (var j = 0; j < trListValues.length; j++) {
        tbody.append(trListValues[j]);
      }
    }
  }

  $.fn.tablesort = function(userConfig) {
    // Create and save table sort configuration.
    $.extend(config, userConfig);

    // Process all selected tables.
    var selectedTables = this;
    for (var i = 0; i < selectedTables.length; i++) {
      var table = selectedTables[i];
      var tableHeader = getSortableTableHeaders(table);
      for (var j = 0; j < tableHeader.length; j++) {
        var th = tableHeader[j];
        $(th).on("click", function(event) {
          var clickColumn = $.inArray(event.currentTarget, getTableHeaders(table));
          changeOrder(table, clickColumn);
        });
      }
    }
    return this;
  };
})(jQuery);