Scriptable properties

Tooltips have three properties that receive functions. One allows you to replace the Canvas-generated tooltips with your own custom HTML tooltips. The other two allow sorting of tooltip items (when several items appear in a single tooltip) and filtering. These properties are listed as follows:

Object	Parameters	Description
custom	(tooltipModel)	Used to generate custom HTML tooltips. See the Custom HTML tooltips section on HTML tooltips in this chapter.
filter	(item, data); array of datasets in data.datasets; array of labels in data.labels; item.x and item.y contain coordinates of the value point, item.xLabel and item.yLabel the labels in each axis, item.index is the index of the item in the dataset, and item.datasetIndex is the index of its dataset.	A function that returns true or false and is called before rendering a tooltip item. If it returns false, the item will not be rendered.
itemSort	(item1, item2); each parameter is an item object with the following properties: x, y...