使用groupOrder visjs时间轴对项目进行排序

Question

visjs时间轴groupOrder示例似乎能够对项目进行排序，但我没有看到实际完成此操作的代码 - 我只看到实际对组进行排序的代码（如果可以使用groupOrder对项目进行排序，这似乎更合适'项目订购'，因为后者的性能限制为300件物品）。在此示例中，负责订购“第2项”，“第3项”和“第4项”的是什么？ http://jsfiddle.net/5p0ggwkx/1369/

<div id="visualization"></div>

  var groups = new vis.DataSet([
    {id: 0, content: 'First', value: 1},
    {id: 1, content: 'Third', value: 3},
    {id: 2, content: 'Second', value: 2}
  ]);

  // create a dataset with items
  // note that months are zero-based in the JavaScript Date object, so month 3 is April
  var items = new vis.DataSet([
  {id: 1, group: 0, content: 'item 1', start: new Date(2014, 3, 19), end: new Date(2014, 3, 20)},

    {id: 0, group: 0, content: 'item 0', start: new Date(2014, 3, 17), end: new Date(2014, 3, 21)},
{id: 2, group: 1, content: 'item 2', start: new Date(2014, 3, 16), end: new Date(2014, 3, 24)},
 {id: 3, group: 1, content: 'item 3', start: new Date(2014, 3, 16), end: new Date(2014, 3, 24)},
{id: 4, group: 1, content: 'item 4', start: new Date(2014, 3, 16), end: new Date(2014, 3, 26)},

{id: 5, group: 2, content: 'item 5', start: new Date(2014, 3, 24), end: new Date(2014, 3, 27)}
  ]);

  // create visualization
  var container = document.getElementById('visualization');
  var options = {
    // option groupOrder can be a property name or a sort function
    // the sort function must compare two groups and return a value
    //     > 0 when a > b
    //     < 0 when a < b
    //       0 when a == b
    groupOrder: function (a, b) {
      return a.value - b.value;
    },
    editable: true
  };

  var timeline = new vis.Timeline(container);
  timeline.setOptions(options);
  timeline.setGroups(groups);
  timeline.setItems(items);

Answer 1

要订购组内的项目，您可以根据order使用docs选项。你可以找到更好的解释和工作演示here。