ColorPicker

html

<span id="color">
   <SpotfireControl id="Input Filed goes here" />
</span>




ColorPicker.js

colorInput = document.querySelector("#color input")

colorInput.type="color"

Here is a use case on how to use it. 

changeColor.py

from Spotfire.Dxp.Application.Visuals import CombinationChart, CategoryKey

from System.Drawing import Color

# cast visual to combo chart

combinationChart = vis.As[CombinationChart]()

# get script parameters from doc props

category = CategoryKey("Banana") 

# get the color from the color picker doc prop
hcolor = Document.Properties["color"] #hexadecimal color

color = Color.FromArgb(int(hcolor[1:3], 16), int(hcolor[3:5], 16), int(hcolor[5:7], 16))

# change the color for the corresponding category

combinationChart.ColorAxis.Coloring.SetColorForCategory(category,color)