I'm using RGraph on a Raspberry Pi and all I get is a blank page

Posted by ED on 15th January 2016

I am a complete noob on some of this stuff.  I probably have something simply wrong.  I want to use some guages to show
temperatures from sensors on a raspberry pi.  I found this site and I thought Aha!  Not so much so far, my own ignorance
for sure.  Here is the code I have

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<script src="../libraries/RGraph.common.core.js"></script>

<script src="../libraries/RGraph.gauge.js"></script>

<title>Test Guage Page!</title>

</head>

<body>

<canvas id="cvs" width="250" height="250">

        [No canvas support]

</canvas>

<script>

        window.onload = function ()

        {

                var gauge = new RGraph.Gauge({

                        id: 'cvs',

                        min: 0,

                        max: 10,

                        value: 3.2

                }).draw();

        };

</script>

</body>

</html>

My file is in /var/www/Rgraph directory.  All the other Rgraph files and folders are in this directory.  What do I have
wrong?  Can someone tell me?

Thanks

Posted by Richard on 15th January 2016

Hi,

The code is fine - the only thing that I can see may be wrong is the paths to the libraries.

If your files are in /var/www/Rgraph as you say then create a folder in there called libraries and put the libraries in
it, so the paths to them look like this:

/var/www/Rgraph/libraries/RGraph.common.core.js

/var/www/Rgraph/libraries/RGraph.gauge.js

Then in your HTML file you can refer to them like this:

<script src="./libraries/RGraph.common.core.js"></script>

<script src="./libraries/RGraph.gauge.js"></script>

Richard

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