.net Powerful JavaScript charts
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 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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AJAX functions

The RGraph svg libraries incorporate ajax functions that make it easy for you to fetch data from your server and then use it to create your charts. You can use them by simply including the file RGraph.svg.common.ajax.js in your page and then use the functions like the following example code shows.

See also:
There's also a dedicated csv reader that fetches data via ajax. The CSV reader is documented here.

    RGraph.SVG.AJAX.getJSON('/getdata.html?json', function (json)
        var bar = new RGraph.SVG.Bar({
            id: 'chart-container',
            options: {
                xaxisLabels: json.labels,
                marginInner: 5,
                backgroundGridVlines: false,
                backgroundGridBorder: false,
                yaxis: false,
                yaxisScaleMax: 100,
                marginLeft: 50,
                shadow: true,
                shadowOpacity: 0.1,
                colors: ['Gradient(orange:orange:white)']

The available functions can just fetch the desired resource or can go further, such as the getJSON function which doesn't return the string that the server provides; it returns a usable javascript object for you. Here are the functions: