Fires when the value has changed.
Default: null.
Type: Function.
Parameters:
e: jQuery.Event object
arg
arg.oldValue: the gauge's old value.
arg.newValue: the value to be seted.
Code Example:
Supply a function as an option.
$("#gauge").wijgauge({
valueChanged: function(e, arg){}
})
Bind to the event by type: wijgaugevaluechanged
$("#gauge").bind("wijgaugevaluechanged", function (e, arg) {});