The visjs timeline groupOrder example appears to be able to sort items, but I don't see the code that actually accomplishes this – I only see the code that actually sorts the groups (if it is possible to sort the items with groupOrder that seems preferable to 'item ordering' because the latter has a performance limitation of 300ish items). What is responsible for ordering 'item 2', 'item 3' and 'item 4' in this example? 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);
