Question

我知道如何在表格中添加行。但是在这个给定的网站上http://www.javascriptbook.com/code/c12/sort-table.html

var compare = {                           // Declare compare object
  name: function(a, b) {                  // Add a method called name
    a = a.replace(/^the /i, '');          // Remove The from start of parameter
    b = b.replace(/^the /i, '');          // Remove The from start of parameter

    if (a < b) {                          // If value a is less than value b
      return -1;                          // Return -1
    } else {                              // Otherwise
      return a > b ? 1 : 0;               // If a is greater than b return 1 OR
    }                                     // if they are the same return 0
  },
  duration: function(a, b) {              // Add a method called duration
    a = a.split(':');                     // Split the time at the colon
    b = b.split(':');                     // Split the time at the colon

    a = Number(a[0]) * 60 + Number(a[1]); // Convert the time to seconds
    b = Number(b[0]) * 60 + Number(b[1]); // Convert the time to seconds

    return a - b;                         // Return a minus b
  },
  date: function(a, b) {                  // Add a method called date
    a = new Date(a);                      // New Date object to hold the date
    b = new Date(b);                      // New Date object to hold the date

    return a - b;                         // Return a minus b
  }
};

$('.sortable').each(function() {
  var $table = $(this);                     // This sortable table
  var $tbody = $table.find('tbody');        // Store table body
  var $controls = $table.find('th');        // Store table headers
  var rows = $tbody.find('tr').toArray();   // Store array containing rows

  $controls.on('click', function() {        // When user clicks on a header
    var $header = $(this);                  // Get the header
    var order = $header.data('sort');       // Get value of data-sort attribute
    var column;                             // Declare variable called column

    // If selected item has ascending or descending class, reverse contents
    if ($header.is('.ascending') || $header.is('.descending')) {  
      $header.toggleClass('ascending descending');    // Toggle to other class
      $tbody.append(rows.reverse());                // Reverse the array
    } else {                                        // Otherwise perform a sort                            
      $header.addClass('ascending');                // Add class to header
      // Remove asc or desc from all other headers
      $header.siblings().removeClass('ascending descending'); 
      if (compare.hasOwnProperty(order)) {  // If compare object has method
        column = $controls.index(this);         // Search for column’s index no

        rows.sort(function(a, b) {               // Call sort() on rows array
          a = $(a).find('td').eq(column).text(); // Get text of column in row a
          b = $(b).find('td').eq(column).text(); // Get text of column in row b
          return compare[order](a, b);           // Call compare method
        });

        $tbody.append(rows);
      }
    }
  });
});

我不明白为什么它不会继续向tbody添加相同的内容，我已经尝试在控制台中将新内容附加到tbody并且每次都添加一个额外的行。有什么原因吗？

Answer 1

您无法将这些行添加到表中，因为它已经添加了。

首先，您的rows变量将引用（不复制值）存储到已添加到表中的tr节点数组中。这里的append函数不能按预期工作，因为它检查了已经是tbody子元素的行。因此，您需要将行克隆到新对象，如下所示：

 var rows = $tbody.find('tr').clone().toArray();

而不是

 var rows = $tbody.find('tr').toArray();

JQUERY向表中添加行

1 个答案: