• DOWNLOAD
• SVG
• CANVAS
• DEMOS
• BLOG
• VIDEO
• ABOUT
• LICENSE
• SUPPORT

• download
• svg
• canvas
• demos
• blog

• video
• 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.

More »

 

Version 7.11 (released in March 2026) is the latest version of RGraph and contains just a few updates to the code which you can see on the changelog page. There's a new dumbbell variation for the Bar and Horizontal bar charts (both SVG and canvas) and the front page layout of the website has been tweaked.

Download »

 

In the April 2025 (v6.21) release a new datagrid object was added. This makes it easy to add static or dynamic data tables to your pages. It can be used whether you use the canvas or SVG libraries or entirely standalone.

Read more »

 

Get the latest version of RGraph (version 7.11, 21st March 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.

Download »

 

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.

More »

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 ()