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Charting Components Don't Work
Posted: 16:33, 03 Nov 2015
by deonsmt
I would like to chart data I receive back from an RFDuino. I found a great library called CanvasJS to do this. The problem is that the graphs don't render in the the EvoThings client on Apple iOS 9. I switched to my Android 4.4.2 tablet and the same thing problem occurs. The graph background is drawn, but no titles or graph information is rendered. If I touch the canvas in the vicinity of a point, the point value is displayed.
After some googling, I found a reference in the Evothings Canvas example to another library at
http://www.humblesoftware.com/flotr2That also does not work with the EvoThings client on either Apple or Android products.
Has anyone found a JS charting component that works with the EvoThings client?
[img]
Evothings.png
[/img]
Re: Charting Components Don't Work
Posted: 16:46, 03 Nov 2015
by Fredrik
Curious.
As you may know, we use use vanilla JS and the Canvas element to draw our own graphs, as seen in the TI SensorTag examples. I have a faint memory of trying and failing to get flotr to work.
If you use a static data set and drop the rfduino connection, can you make your app work in a regular web browser? Will it then also work on the phone's web browser?
If no, then you've most likely found a bug in the chart library. If yes, you'll have found a bug in our webview.
Re: Charting Components Don't Work
Posted: 16:55, 03 Nov 2015
by deonsmt
The basic charting code works in a regular browser. What I found is that the problem is caused by the css file. If I remove the EvoThings css import shown below, then the charting components (both Flotr2 and CanvasJS) work
Code: Select all
<style>
@import 'ui/css/evothings-app.css';
</style>
Not sure what that means!
Re: Charting Components Don't Work
Posted: 17:01, 03 Nov 2015
by deonsmt
I removed the style applied to the <canvas> from the css file and that fixes the problem
Removed this:
Code: Select all
canvas {
padding: 7px;
border-radius: 4px;
border: none;
background-color: #f3f3f3; /* Default color: "Arctic" */
}
Re: Charting Components Don't Work
Posted: 17:06, 03 Nov 2015
by Fredrik
The file 'evothings-app.css' is a hodgepodge of many different stylesheets. It has not been tested with anything but our unmodified example apps. It is entirely possible that our css file caused your graphs to become invisible. I suggest that you keep it removed.
If you still need the styles from it, you could copy/paste parts of it, one at a time, so you can find which part breaks the charts.
... <reads the previous post>
You're fast.
Re: Charting Components Don't Work
Posted: 17:25, 03 Nov 2015
by deonsmt
Thanks Fredrik - things are looking good now!