Just want to share sliderfill plugin, which can be used to apply background color for slider, when value is changed or thumb is moved. This supports slider with single and multiple thumb. Filling effects are not so fluid and i had to apply slider override to make it work.
You can find code here https://github.com/tomalex0/SenchaTouch-V2-SliderFill
Screenshots are available at
Please have a look into the code and do let me know if it can be written in better way :)
Works with ST2RC