RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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hello I would like to know how to change my code so that value changes itself without onmouseout or onclick just when I change the value with a button

thank you cordially

Fabien

Here's a demo of updating a Fuel chart with a random value whenever you click the button:

https://codepen.io/rgraph/pen/WNMomYw

The button click event runs the update function which updates the Fuel chart.