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• svg
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• demos
• blog

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• about
• license
• support

RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 18 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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Version 7.20 (released in June 2026) is the latest version of RGraph and the major change in this version is an update to the default values of properties making for better looking charts without having to set any properties. Read more about this and other changes in the changelog.

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Get the latest version of RGraph (version 7.20, 9th June 2026) 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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These are the latest support forum posts that have been posted or updated.

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16th June, Rachel
I have a question about the 3D Bar chart

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12th June, Marco
Should I use SVG or canvas for the charts on my website?

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9th June, Richard
New version of RGraph: version 7.20

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3rd June, Patrick
Question about installing RGraph

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1st June, Ouja
How do I add a click event to a bar in my Bar chart?

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Support forum »

 

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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Hello,
I should draw the graph and based on the input data updating the graph with the new data, and this works but draw the new bars on top of the old ones without gradually removing the bars of the previous graph, without updating the graph. How can I solve?
Thanks

You can use the RGraph.clear() function to clear the canvas before drawing a second time. For example:

var canvas = myObject.canvas;

RGraph.clear(canvas);

PS. If you want an animated change then the Bar chart supports this by supplying the new data to the grow() function. There's an example here:

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

The code of which is this:

bar = new RGraph.Bar({
id:'cvs',
data: [8,4,6,3,5,4,2],
options: {
     yaxis:false,
     xaxis:false,
     backgroundGridVlines: false,
     backgroundGridBorder: false,
     yaxisScaleMax: 20
}
}).grow();

setInterval(function ()
{
    // count,min,max[,decimals]
    newData = RGraph.arrayRandom(7,0,20);

    bar.grow({data: newData});
}, 2000);

Richard

I tried to write:

var canvas = document.getElementById ('cvs');
RGraph.clear (canvas);

before redrawing the graph the second time but I don't update the graph.

You then need to redraw the chart with either an animation function or the draw function like this:

var canvas = document.getElementById ('cvs'); // Or myObject.canvas works too

RGraph.clear (canvas); // Clear the canvas
myObject.draw();     // Redraw the chart

I tried but don't work.
I share the whole function so that you can check where the error is:


function mostraNascondiGrafico(arrayValGraficoAsseX, arrayDateLabelAsseX, arrayLimiti) {






    if ($('#divGraph').is(':visible')) {
     $("#divGraph").hide();
     $("#buttMostrNascGrafico").text("MOSTRA GRAFICO");
     }
     else {

     $("#divGraph").show();
     $("#buttMostrNascGrafico").text("NASCONDI GRAFICO");
    


//I entered the suggested lines here, is that correct?
    var canvas =document.getElementById('cvs');
    RGraph.clear(canvas);




    
    bar = new RGraph.Bar({
        id: 'cvs',
    
        data: arrayValGraficoAsseX,


        options: {

            yaxisScaleMax: 80,
            backgroundGridVlines: false,
            backgroundGridBorder: false,
            backgroundGridColor: '#999',
            
            xaxisLabels: arrayDateLabelAsseX,

            marginLeft: 55,
            marginRight: 55,
            marginBottom: 75,

            colors: ['Gradient(#A18AC5:#D1AAF5)'],
            textColor: '#ccc',
            xaxisTickmarksCount: 0,
            xaxis: false,
            yaxis: false,
            shadowColor: 'black',
            shadowOffsetx: 0,
            shadowOffsety: 0,
            shadowBlur: 15,
            colorsStroke: 'rgba(0,0,0,0)',
            combinedEffect: 'wave',
            combinedEffectOptions: '{frames: 30}'

        }
    });


    line = new RGraph.Line({
        id: 'cvs',
        data: arrayLimiti,
        options: {
            yaxisScaleMax: 80,
            xaxis: false,
            yaxis: false,
            backgroundGrid: false,
            colors: ['#d00'],
            yaxisPosition: 'right',
            textColor: '#ccc',
            marginLeft: 45,
            marginRight: 45,
            tickmarksStyle: null,
            spline: true,
            combinedEffect: 'trace',
            textSize: 18
        }
    });

    combo = new RGraph.CombinedChart([bar, line]).draw();

    // Poiche la classe combinata disattiva le etichette del grafico a linee,
    // le riattiva
    line.set({
        yaxisScale: true
    });

    RGraph.redraw();

    // Aggiunge alcune capacita di risposta al grafico a barre
    bar.responsive([


         {maxWidth: null, width: 1400, height: 500, options: {textSize: 18, marginInner: 20}},
        {maxWidth: 1600, width: 1400, height: 500, options: {textSize: 12, marginInner: 7}}



    ]);

    
    line.responsive([
        {maxWidth: null, width: 1400, height: 500, options: {textSize: 18, marginInner: 45, linewidth: 7}},
        {maxWidth: 1600, width: 1400, height: 500, options: {textSize: 12, marginInner: 20, linewidth: 5}}

        
    ]);




    }
}

solved, I used the reset () function instead of clear ()