How to Add Data Labels in Scatter Chart in Chart js

How to Add Data Labels in Scatter Chart in Chart js

In this video we will cover how to add data labels in scatter chart in chart js. A scatter chart and line chart are quite similar but the scatter chart works with x and y coordinates. This is why using the datalabels plugin is not an option as it does not recognize the data structure. We will need a custom plugin for custom data labels in chart js.

We will create our own plugin which will work specifically for the scatter chart and make our own data labels for that. This will be a nice challenge and requires a good understanding of the canvas API.

Let's explore this right now!

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Creating charts in javascript is very rewarding but extremely challenging. The Chart JS library made it easier to render charts. However the chart js documentation is hard to understand for many. It requires a lot of different moving parts to work along. The canvas tag, javascript, arrays and Chart JS all need to be combined to draw an eye catching bar chart or line chart.

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Chart JS is a javascript library to draw charts in the canvas tag on your site. Presenting data in a visual manner such as charts is more effective and appealing. All the charts are always coded in the latest Chartjs version which is as of this recording Chart JS 3.6.0.

What type of charts can you make with Chart.JS?
With chart js you can make line chart, bar chart, pie chart, doughnut chart, scatter chart, polar area chart, radar chart, gauge chart and area chart. And with some clever tricks and visual adjustment more can be done.

[meloeve]

very helpful, your tutorial saves me a lot of time

[Axlthedevil]

Thank you much for producing a video just to my problem. :) :) This is a great honor for me! The video helped me very much for it shows quite exactly what I needed. One data label per line was enough, but I could easily skip the others and show only one. Thank you again.

[juancmuyou]

Hello EverYone, i am looking for the way to create a scatter chart join by line, each line has 2 coordinates but each is the same serie.

[sergiomng]

Thanks a lot for posting this video!! it was very helpful. Have you ever tried to do this very exact thing having 2 or more charts on the same page? I was able to add labels to a scatter chart, however, if I want to display another one with different data, the plugin that is called "afterDatasetDraw" always throws an exception: "Uncaught TypeError: Cannot read properties of undefined (reading 'x')". If I display one or the another individually, they work, but when displaying them at the same time (every chart has it's own variable names, no duplicates) I always get this exception. I don't know if it's a bug from chart.js or if I'm doing something wrong. Thanks again!!