Help with Custom Component: Ajax and ValueChangeListener

Question

Hello,
I am trying to create a custom component that triggers an update via Ajax. However, I would also like to trigger a ValueChangeListener method from the same component, however I am unsure of how to obtain and trigger the ValueChangeEvent.
The code I have so far in the Phase Listener is:
private void handleAjaxRequest(PhaseEvent event) {
     FacesContext context = event.getFacesContext();
        HttpServletResponse response = (HttpServletResponse)context.getExternalContext().getResponse();
        Object object = context.getExternalContext().getRequest();
        if (!(object instanceof HttpServletRequest)) {
            return;
        HttpServletRequest request = (HttpServletRequest)object;
        HttpSession session =  request.getSession();
        String requestType = request.getParameter("jsflotRequestType");
        if (requestType != null && requestType.equalsIgnoreCase("jsflotchartValueChange")) {
             //Trigger valueChangeEvents
             log.info("Handling JSFlot Chart Value Change Event.");
}What I am looking for though, is some information regarding how to obtain the ValueChangeListener from the request/session objects.
The component tag is called like this:
<jsflot:flotChart id="valueTimeChart"
     value="#{chartMbean.chartSeries}"
     valueChangeListener="#{chartMbean.valueChangeListener}"Any help would be greatly appreciated!

Answer 1

The field calculation order was not in the correct order, had a devil of a time figuring out how to get to it, in Acrobat X.
My check boxes for shipping have the same name field but I don't see a tab for export value for the check boxes, and I have no idea how to implement your suggestions for a switch or if statement or what fields to attach them to. 
My amatuer attempt at a shipping formula follows, I don't know if I can use a range for event value, or where to put the script, if it is even correct.
if(event.value == "<25.01")
    nShipFee = 06;
else if(event.value == "25.01 - 75")
    nShipFee = 11.50;
else if(event.value == "75.01 - 125")
    nShipFee = 15;
else if(event.value == "125.01 - 200")
    nShipFee = 20;
else if(event.value == "200.01 - 300")
    nShipFee = 25;
else if(event.value == "300.01 - 400")
    nShipFee = 30;
else if(event.value == ">400")
    nShipFee = 50;