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.net Powerful JavaScript charts
About
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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Download
Get the latest version of RGraph (version 6.19, 28th September 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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License
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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Vertical Progress bar API reference

The Bar chart can be customised to appear as a Vertical Progress bar. This means that all of the properties that pertain to the Bar chart, such as tooltips, can be used as well. There's an example in the download archive that you can see here.

Example

<script>
    // This Bar chart becomes the background of the progress bar
    new RGraph.SVG.Bar({
        id: 'chart-container',
        data: [100],
        options: {
            colors: ['Gradient(#eee:white)'],
            marginLeft: 45,
            marginRight: 5,
            backgroundGrid: false,
            colorsStroke: '#ccc',
            marginInner: 10,
            yaxis: false,
            yaxisScale: false,
            xaxis: false,
            linewidth: .5,
            shadow: true,
            shadowOpacity: .1
        }
    }).draw();

    // This Bar chart becomes the inner bar of the progress bar
    new RGraph.SVG.Bar({
        id: 'chart-container',
        data: [73],
        options: {
            yaxisScaleMax: 100,
            yaxisScaleUnitsPost: '%',
            yaxisTextColor: '#666',
            yaxis: false,
            xaxis: false,
            shadow: true,
            shadowOffsetx: 1,
            shadowOffsety: 1,
            shadowBlur: 1,
            titleColor: '#666',
            colors: ['Gradient(red:#fcc)'],
            backgroundGrid: false,
            tooltips: ['Monday was an average day'],
            tooltipsCss: {
                backgroundColor: '#333',
                fontWeight: 'bold',
                fontSize: '14pt',
                opacity: 0.85
            },
            marginLeft: 45,
            marginRight: 5,
            marginInner: 15
        }
    }).grow();
</script>