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 use for showing charts on your website.

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Get the latest version of RGraph (version 6.18, 1st June 2024) from the download page. You can read the changelog here. 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 (£129) commercial license available.

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Popular coding languages

[No canvas support]

This Horizontal Bar chart does not use the yaxisLabels option but instead has a minimal marginLeft setting and then uses some custom code in the draw event to manually draw some labels. It also uses the labelsAbove option to indicate the percentages for each bar.

The grow effect is employed to animate the chart.

If the draw event wasn't used and the labels were simply added after the chart had been drawn then they would disappear when the canvas is cleared for the second frame of the animation. And that happens so fast that it would seem like they just aren't being drawn.

The responsive function doesn't do much - it simply changes the width and height of the canvas tag and changes the css float that's applied to the container of the canvas.

This chart has been updated in March 2020 to add tooltips that use formatting and the highlighting color has been updated to a gradient so that the labels on the left-hand-side are unobscured.

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.tooltips.js"></script>
<script src="RGraph.hbar.js"></script>
Put this where you want the chart to show up:
<div style="float: right">
    <canvas id="cvs" width="600" height="350">[No canvas support]</canvas>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):
    // The labels for the chart are not added by giving them to the
    // chart but manually adding text to the chart.
    labels = ['PHP','Python','C#','Java','MySQL','Oracle','JSP','MS SQL Server','Ruby'];

    // Create the Horizontal Bar chart and configure it. With there
    // being no labels on the left-hand-side the margin autofit
    // will make the left margin zero
    new RGraph.HBar({
        id: 'cvs',
        data: [86,75,71,65,60,55,53,51,45],
        options: {
            textSize: 14,
            backgroundGrid: false,
            xaxis: false,
            yaxis: false,
            xaxisScale: false,
            labelsAbove: true,
            labelsAboveUnitsPost: '%',
            colors: ['green'],
            shadow: true,
            shadowColor: '#ddd',
            shadowOffsetx: 2,
            shadowOffsety: 2,
            tooltips: '<i style="position: relative; top: -5px">Usage worldwide:</i> <span style="font-size: 26pt; ">%{value}%',
            tooltipsCss: {
                fontSize: '14pt'
            highlightFill: 'Gradient(rgba(255,255,255,0):white)',
            highlightStroke: 'Gradient(rgba(255,255,255,0):white)',
            responsive: [
                {maxWidth: null,width:600,height: 350,parentCss:{'float':'right', textAlign:'none'}},
                {maxWidth: 800,width:400,height: 300,parentCss:{'float':'none', textAlign:'center'}}
    // Use the draw event to add the labels on the left-hand-side
    }).on('draw', function (obj)
        var coords = obj.coords;

        // Loop through the coordinates of the bars
        for (var i=0; i<coords.length; ++i) {
            // For each of the coordinates add a text label
            // on the left-hand-side of the bar
                object: obj,
                text:   labels[i],
                x:      coords[i][0] + 10,
                y:      coords[i][1] + (coords[i][3] / 2),
                valign: 'center',
                bold:   true,
                color:  'white',
                size: obj.get('textSize')