sliders + addTraces bug

[DaanyWaay]

If I add the traces manually the slider.steps[0] looses its arguments: https://codepen.io/anon/pen/ydMLyK

[etpinard]

Hi @DaanyWaay

Using

graph.on('plotly_sliderchange', (event) => {
  console.log(event.step.args);
})

as in https://codepen.io/etpinard/pen/PreaRY?editors=1010 seems to always give the correct args list.

[etpinard]

Related: #1704

[DaanyWaay]

Please notice that
console.log(event.step.args);
returns array of args as declared in sliders.steps but:

• the first item is always "visible" string - PASS
• the 2nd item is the array of values for step 2 and 3 - PASS
• the 2nd item is empty array for step 1 - FAILED
  It is not possible to show the red line.

And this is the same code but with traces declared in newPlot, not by addTraces:
https://codepen.io/anon/pen/jjKRme?editors=1010

[etpinard]

• the 2nd item is empty array for step 1 - FAILED
  It is not possible to show the red line.

I don't understand what you're referring to here. Can I ask: what are you trying to accomplish with the slider event data?

[DaanyWaay]

What I want to accomplish is exactly what you see in that code pen. This new pen is a slightly modified version of the previous one:
https://codepen.io/anon/pen/ydMLyK
I appreciate if you could explain why I can not display the red line while scrolling the slider. The traces have to be added by addTraces.
Please check the console log while scrolling the slider:

• green: ["visible", Array(6)]
• blue: ["visible", Array(6)]
• red: ["visible", Array(0)]

This plot has exactly the same configuration and data and works OK: https://codepen.io/anon/pen/XLBGqq but I don't use addTraces there.

[etpinard]

Ah now I see it. Thanks for posting!