Remove all traces

šŸ“Š Plotly Python
1

Hello! Iā€™m really enjoying the new Plotly Python library, itā€™s great.

I donā€™t know if this is a daft question but I wonder if there is a function to delete all traces from my chart, to revert it to an empty FigureWidget?

Iā€™m setting up a scatterplot with several different datasets that I would like to compare. I start with an empty FigureWidget and add scatter traces using ā€˜fig.add_scatterā€™ using a dropdown list to choose which of my datasets Iā€™d like to load to compare.

What Iā€™d really like to be able to do is add a button which removes all my added traces and returns it to an empty plot so that a user can reset the chart and start over choosing traces to compare, but I canā€™t work out how to do this.

Iā€™ve tried just making a button that runs go.FigureWidget() again but this doesnā€™t do anything, my chart looks the same!

Any ideas?

Thanks

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2

Hi @KidSampson, glad youā€™re enjoying the library!

You can remove all traces for a FigureWidget by assigning an empty list the the data property

fig.data = []

You can also remove only select traces by assigning the data property to a subset of itself. So to remove the second trace, but keep the first and third trace:

fig.data = [fig.data[0], fig.data[2]]

If you need to clear the layout as well, assign an emtpy dict to the layout property

fig.layout = {}

Hope that helps!
-Jon

9 Likes
3

Thatā€™s brilliant, I thought it had to be something like that but I couldnā€™t work it out. Thank you!

1 Like
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Thanks @jmmease, That was a simple but a brilliant solution.
I was using three dropdowns to plot traces (corresponding to the selected dropdown values) in a graph object. When the dropdown values are cleared i.e when no values are selected, I wanted the graph object to remove all traces but retain the layout properties (x-axis, yaxis range, ticks etc.).

Various solutions I had tried before either removed the Graph object in its entirety or placed an empty graph object. The layout would also disappear. Aesthetics wise this was an eyesore.

So, I came across your solution. Within the callback, I initialised one graph object with valid data and the desired layout. In the next step, I removed all the traces while retaining the layout.

fig.data = []

I will further look for ways to finetune it further.
But thanks for the solution.

-Bhaskar