Question

I have a form in which I am using pimefaces calender component, now when user will select his date of birth using this component, I want to calculate his current age and need to put in a textbox. The age textbox should get automatically displayed as user will select his date of birth.

<h:outputLabel for="dobirth" value="Date of Birth (mu)" />
                <p:calendar value="#{patient.dob}" id="popupCal">
<p:ajax event="dateSelect" listener="#{patient.handleDateSelect}" />
                </p:calendar>

I am trying to calculate age by this way.

public void handleDateSelect(DateSelectEvent event) throws ParseException {

        System.out.println("inside get age");
        FacesContext facesContext = FacesContext.getCurrentInstance();
        SimpleDateFormat format = new SimpleDateFormat("d/M/yyyy");
        facesContext.addMessage(null,
                new FacesMessage(FacesMessage.SEVERITY_INFO, "Date Selected",
                        format.format(event.getDate())));
        String dd=null;
        dd=format.format(event.getDate());
        System.out.println("date dd"+dd);
        Date date = new SimpleDateFormat("MMMM d, yyyy", Locale.ENGLISH).parse(dd);
        System.out.println("date+++++++++"+date);
        Calendar birth = new GregorianCalendar();
        Calendar today = new GregorianCalendar();
        int calculatedAge = 0;
        int factor = 0;

        Date currentDate = new Date(); // current date
        System.out.println("DOB" + dob);
        birth.setTime(date);
        System.out.println("set birth" + birth);
        today.setTime(currentDate);

        if (today.get(Calendar.DAY_OF_YEAR) < birth.get(Calendar.DAY_OF_YEAR)) {
            factor = -1;

        }
        calculatedAge = today.get(Calendar.YEAR) - birth.get(Calendar.YEAR)
                + factor;
        System.out.println("age is " + calculatedAge);
    }

And I also need to display age as soon as user selects his birth using calender.

How can I display it in jsf 2.0 once I got my age.?

Answer 1

Something like this (add getter to calculatedAge property).

<h:form>
    <h:outputLabel for="dobirth" value="Date of Birth (mu)" />
    <p:calendar value="#{patient.dob}" id="popupCal">
        <p:ajax event="dateSelect" listener="#{patient.handleDateSelect}"      
               update="age" />
        </p:calendar>
    <h:outputText id="age" value="#{patient.calculatedAge}"/>
</h:form>