Changing range slider knob to show value

I’d like to show the value of the range slider within the range knob. Something like this:


And obviously, I’d like to do this within the change event. Any js code snippet to do this would be appreciated.

(So, what goes in the function(e, range)?)

	el: '#rangeWeatherAdjust',
	label: true,
	on: {
		change: function (e, range) {