javascript - jQuery Slider value undefined -


i'm trying learn how use jquery sliders. can't value slider on change/slide. how value?

$(function() {     $('.slider').slider({         value: 0,         min: 0,         max: 100,         step: 1,         change: function() {             updateval(this);         }     }); });  function updateval(bar) {     //this returns object     var selection = $('.ampsli').slider('value');     alert(selection);      //this returns 'undefined'     alert(bar.value); }

pass ui object in updateval:

    change: function (event, ui) {         updateval(ui);     }

demo: http://jsfiddle.net/lotusgodkk/gcu2d/723/


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