Work with Plotly

If you want interactive plots on some pages and are not afraid of using heavy javascript libraries, then Plotly is a nice library. The Julia wrapper PlotlyJS.jl can be used to generate Plotly plots.

Pre-requisites

Download plotly.min.js saving it to /_libs/plotly/plotly.min.js.

Then create a variable hasplotly with default value false: in your config.md write

@def hasplotly = false

Finally, in your src/_layout/head.html add

{{if hasplotly}} <script src="/libs/plotly/plotly.min.js"></script> {{end}}

Offline-generated plot

Assuming you already have the Plotly code for some plot, displaying the result on a page with Franklin is now pretty straightforward. Start by adding

@def hasplotly = true

so that the JS library will be loaded then somewhere appropriate add:

~~~
<div id="tester" style="width:600px;height:350px;"></div>

<script>
	TESTER = document.getElementById('tester');
	Plotly.plot( TESTER, [{
	x: [1, 2, 3, 4, 5],
	y: [1, 2, 4, 8, 16] }], {
	margin: { t: 0 } } );
</script>
~~~

This will give:

Live-generated plot

One step further is to use PlotlyJS to define a plot then pass the result to Franklin. Start by adding PlotlyJS and Random to your environment:

(myWebsite) pkg> add PlotlyJS Random

Then, beyond the @def hasplotly = true, add the following code:

```julia:ex1
using PlotlyJS
z =  [10     10.625  12.5  15.625  20
     5.625  6.25    8.125 11.25   15.625
     2.5    3.125   5.    8.125   12.5
     0.625  1.25    3.125 6.25    10.625
     0      0.625   2.5   5.625   10]

data   = contour(; z=z)
layout = Layout(; title="Basic Contour Plot")
plt    = plot(data, layout)

fdplotly(json(plt)) # hide
```
\textoutput{ex1}

Note: the fdplotly is a convenience function exported by Franklin; it just prints the required HTML such that a plotly object gets placed. It takes the JSON string of the plot (which you can get with json(plt)) and takes two optional keyword arguments:

  • id: to specify the name of the div the plotly object is associated to, it's randomly generated by default, and,

  • style which takes a string indicating the desired CSS for the div e.g. the default is "width:600px;height:350px".

The code block above gives:

using PlotlyJS
z =  [10     10.625  12.5  15.625  20
     5.625  6.25    8.125 11.25   15.625
     2.5    3.125   5.    8.125   12.5
     0.625  1.25    3.125 6.25    10.625
     0      0.625   2.5   5.625   10]

data   = contour(; z=z)
layout = Layout(; title="Basic Contour Plot")
plt    = plot(data, layout)