February 2019
Beginner to intermediate
284 pages
6h 20m
English
Content preview from Learn Chart.js
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Tooltip callbacks
With callbacks, you can dynamically generate the text contents and colors of the items displayed in a tooltip based on data values and other accessible attributes. The Callbacks are properties of the tooltips.callbacks object, which can be configured globally (Chart.defaults.global.tooltips.callbacks) or locally per chart instance (options.tooltips.callbacks). They are listed in the table as follows:
|
Object |
Parameters |
Description |
|
beforeTitle, title, afterTitle |
(item[], data); array of datasets in data.datasets; array of labels in data.labels; each item element contains the following properties: x, y, xLabel, yLabel, index, dataSetIndex. |
The title function returns the text for the tooltip title. You can also ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.