Primefaces slider <p:slider>: detect sliding - ajax

Question

Is it possible to detect the event "while sliding" in a primefaces slider?
I have a poll (every 3 seconds the sliders are updated) to update the sliders' values (as multiple clients can use the slide).
When I am sliding and a periodic ajax call is made (by <p:poll>), the slider returns to its initial position. This behavior is understandable, because the form itself is refreshed.
I need to avoid this: when I'm sliding, I want the poll to stop. When I stop sliding the ajax event "slideEnd" is called. In this event, I would return the poll refresh process normally.
Is this possible? What would I need?
Edit: I found out about onSlide and onSlideStart attributes of <p:slider>. I used something like:
<p:slider for="porta2005" minValue="0.0" maxValue="100.0" step="1" styleClass="width-100" onSlide="#{dimmerBean.slideStart()}">
<p:ajax event="slideEnd" listener="#{dimmerBean.mudaTensao2005}" update="tensao2005"/>
</p:slider>
But the method slideStart() is called on every poll request inside bean, not only when I effectively slide. Is it wrong to call a bean method inside onSlide like this?
I am using Primefaces 6.1.

Answer 1

The onSlide, onSlideStart, and onSlideEnd are client side callbacks. So if a backing bean method is put in these attributes, it will be called during render, and not during the actual event.
From the documentation:
Name Default Type Description
onSlide null String Client side callback to execute during sliding.
And a little below this:
Client Side Callbacks
Slider provides three callbacks to hook-in your custom javascript, onSlideStart, onSlide and
onSlideEnd. All of these callbacks receive two parameters; slide event and the ui object containing
information about the event.
You can stop polling by using the poll widget functions. Suppose your p:poll has a widgetVar attribute as myPoll, you can pause it during sliding as shown.
<p:slider for="porta2005" minValue="0.0" maxValue="100.0" step="1" styleClass="width-100"
onSlideStart="PF('myPoll').stop()" onSlideEnd="PF('myPoll').start()">