How do I download the graph with the correct pointer value? - Official support forum

Joao Pedro · 2023-02-28T19:08:20+00:00

I try download of graph with code below: $(".test").append(`<a download href='${obj.canvas.toDataURL("image/png")}'>Test</a><br>`); but when I download the graphic it has the wrong pointer value.

About

RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 17 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

Version 7.01 released

Version 7.01 (released in October 2025) is the latest version of RGraph and now includes a new tree structure object. The accompanying Treemenu object can then turn the object into a fully dynamic tree menu. You can read the API documentation for the tree on the main API documentation page and see an example of the Treemenu feature by following this link...

New HTML datagrid

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.

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Get the latest version of RGraph (version 7.01, 8th October 2025) 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.

Is the chart showing the correct value when the button is pressed? Is there an animation involved?

Can you link to the page that the chart is on or put an example online? What happens if you put a regular, static link on the page for example:

<a href="#" onclick="location.href = myObject.canvas.toDataURL('image/png')">Test</a>

PS If the canvas is supposed to be white, try clearing it to white before drawing:

m = new RGraph.Meter({
    id: 'cvs',
    min: 0,
    max: 200,
    value: 98,
    options: {
    }
}).on('beforedraw', function (obj)
{
    RGraph.clear(obj.canvas, 'white');
}).draw();