Check documentation for the latest version of dhtmlxSuite onChange DHTMLX Docs

onChange

fires after the slider's value was changed

void onChange(number newValue,object sliderObj);
newValuenumberslider's new value
sliderObjobjectdhtmlXSlider current instance

Example

mySlider.attachEvent("onChange", function(newValue, sliderObj) {
    alert("New value is "+newValue);
});

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