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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An adjustable Bar chart

[No canvas support]

Here's a basic Bar chart that only has one configuration option specified: adjustable This means that the chart can be adjusted dynamically by clicking on the chart and moving your mouse up and down. The types of charts that can be adjusted are:

You can read more about adjusting and see the canvas documentation for it here.

When the browser/screen is smaller the size of the canvas is reduced, the textSize is reduced and the css float on the container is removed.

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.bar.js"></script>
Put this where you want the chart to show up:
<div style="float: right">
    <canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):
    // Quite a basic Bar chart which just has the single 'adjustable'
    // property being stipulated meaning that you dynamically adjust
    // the chart
    new RGraph.Bar({
        id: 'cvs',
        data: [8,6,4,8,9,5,3,2,5],
        options: {
            title: 'An adjustable Bar chart',
            titleBold: true,
            titleSize: 16,
            adjustable: true,
            xaxisLabels: ['Alf','Vinny','Moe','Bill','Neil','Olga','Lilly','Paul','John'],
            responsive: [
                {maxWidth: null,width: 600,height: 250,options:{textSize:16},parentCss: {'float':'right'}},
                {maxWidth: 800,width: 350,height: 200,options:{textSize:10},parentCss: {'float':'none', textAlign: 'center'}}