You can use on change, set and get value DA (see tab Slider DA on the example page). But you can reference item value directly, no need to set another item.
Ah thanks. I meant setting another page item based on the slider value. For instance, if the slider represents a percentage from 0 to 100 of some amount, do the math and update the other page item as the slider is sliding.
BTW looks like the jQuery slider widget is not responsive to touch events, tapping the handle and dragging doesn't work, you need to tap on the line to (imprecisely) change the slider position