vis.js is a dynamic, browser-based visualization library
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var assert = require('assert'),
moment = require('moment'),
vis = require('../vis.js'),
DataSet = vis.DataSet,
DataView = vis.DataView;
var groups = new DataSet();
// add items with different groups
groups.add([
{id: 1, content: 'Item 1', group: 1},
{id: 2, content: 'Item 2', group: 2},
{id: 3, content: 'Item 3', group: 2},
{id: 4, content: 'Item 4', group: 1},
{id: 5, content: 'Item 5', group: 3}
]);
var group2 = new DataView(groups, {
filter: function (item) {
return item.group == 2;
}
});
// test getting the filtered data
assert.deepEqual(group2.get(), [
{id: 2, content: 'Item 2', group: 2},
{id: 3, content: 'Item 3', group: 2}
]);
// test filtering the view contents
assert.deepEqual(group2.get({
filter: function (item) {
return item.id > 2;
}
}), [
{id: 3, content: 'Item 3', group: 2}
]);
// test event subscription
var groupsTriggerCount = 0;
groups.subscribe('*', function () {
groupsTriggerCount++;
});
var group2TriggerCount = 0;
group2.subscribe('*', function () {
group2TriggerCount++;
});
groups.update({id:2, content: 'Item 2 (changed)'});
assert.equal(groupsTriggerCount, 1);
assert.equal(group2TriggerCount, 1);
groups.update({id:5, content: 'Item 5 (changed)'});
assert.equal(groupsTriggerCount, 2);
assert.equal(group2TriggerCount, 1);
// detach the view from groups
group2.setData(null);
assert.equal(groupsTriggerCount, 2);
assert.equal(group2TriggerCount, 2);
groups.update({id:2, content: 'Item 2 (changed again)'});
assert.equal(groupsTriggerCount, 3);
assert.equal(group2TriggerCount, 2);