Cannot set colorscale in template for some trace types

In working on developing templates for plotly.py I’ve found that I’m not able to set the colorscale and colorbar properties in the template for some trace types.

This works as I expect for the heatmap trace type. The defualt colorscale of Viridis and the colorbar tick properties are both applied. Pen: https://codepen.io/jonmmease/pen/mzMeMW

var trace1 = {
  type: 'heatmap',
  z: [[1, 2, 3], [4, 5, 6]],
};

var data = [ trace1 ];

var layout = {
  template: {
    data: {
      heatmap: [{
        colorscale: 'Viridis',
        colorbar: {
          ticks: 'inside',
          ticklen: 10,
          tickcolor: 'white'
        }
      }],
    }
  }
};

Plotly.newPlot('myDiv', data, layout);

But it does not work for the scatter.marker colorscale and colorbar. Pen: https://codepen.io/jonmmease/pen/LgjpQG

var trace1 = {
  type: 'scatter',
  y: [1, 2, 3],
  marker: {
    size: 20,
    color: [1, 2, 3],
    showscale: true
  },
  mode: 'markers'
};

var data = [ trace1 ];

var layout = {
  template: {
    data: {
      scatter: [{
        marker: {
          symbol: 'square',
          colorscale: 'Viridis',
          colorbar: {
            ticks: 'inside',
            ticklen: 10,
            tickcolor: 'white'
          } 
        }
      }],
    }
  }
};

Plotly.newPlot('myDiv', data, layout);

Note that scatter.marker.symbol is being picked up from the template, so I’m pretty sure the template specification is correct, but let me know if I’m missing something.

I’ve noticed this same behavior for other colorscales and colorbars, and I can work through an exhaustive list later today if that’s helpful. Thanks!

[jonmmease]

One more issue here. Setting marker.autocolorscale: false in the template causes the colorscale to be displayed properly if the template is already in place when the scatter trace is created. But if the template is applied with relayout after the scatter trace is added, the template’s colorscale is not applied.

[etpinard]

Would react handle this case better, or would the same issues arise? I

No unfortunately. Only newPlot will behave correctly on layout.template edits.