Remove all traces from plotly.js plot

Question

I have a page containing a plot.ly plot, that I want to write data to a few times, overwriting what was there before.

I can't find a way to remove all traces from my plotly.js plot, and just replotting adds the data without removing the old.

Answer 1

There's two ways of doing this, both listing in the plotlyjs function reference page.

Option 1 (tell plotly to delete the trace(s) in question):

Plotly.deleteTraces(graphDiv, 0);

where the second argument is the trace index of the trace to delete. Note that this second argument can also be an array of indices allowing you to delete multiple traces at once.

Option 2 (tell plotly to make a new plot with new data):

 Plotly.newPlot(graphDiv, data, layout);

where the arguments are the same as for Plotly.plot. This creates a new plot drawing only the data sent in the second argument. More precisely, Plotly.newPlot is idempotent whereas Plotly.plot isn't.

Answer 2

you can remove the last trace, and the previous one, and so one until the last one :

while(graphDiv.data.length>0)
{
      Plotly.deleteTraces(graphDiv, [0]);
}