Using RGraph on a Raspberry Pi and all I get is a blank page


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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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