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Days Calculation Method (using ZK and MVVM)

Well, well, step by step i'm chaining all my doubts about ZK framework and MVVM pattern on a simple series of questions, if someone is interested:

Selected Item data from a table to textbox in ZK

Textbox Enabling in ZK

Now, with all the data correctly binded, i decided to play around with the date of my form. So the idea is when i choose a date, it calculates the days with a operation and show it in another textbox, here is the code:

.zul File

 <datebox id="" format="medium" onCreate="" value="@bind(vm.fechaIngreso)" width="100%" 
 onSelect="@command('calcularDias')" mold="rounded" readonly="true" constraint="no empty, no future"
 disabled="@load(empty vm.camaPaciente)"/>

Command on Viewmodel

@Command
@NotifyChange({"fechaIngreso"})
public void calcularDias(){
  long milisegundosPorDia = 24 * 60 * 60 * 1000;
  java.util.Date hoy = new Date();
  long tmp = (hoy.getTime() - this.getFechaRegistro().getTime())/milisegundosPorDia;
  this.setDiasEstancia((int)tmp);
}

where "hoy" = today date and getFechaRegistro = registration date, it suppose it has to calculate the number of days in another textbox, but it doesn't work. Maybe is a binding problem or a calculation problem. i appreciate any suggestion of solution to my problem. Thank you very much.

Solution

    1. I suppose your textbox is bound to the diasEstancia property? then you should let the command notify a change of that value: @NotifyChange({"diasEstancia"})

    2. You don't use the property fechaIngreso (which is bound to your datebox) to calculate the day difference, but you use this.getFechaRegistro() which is not changed as far as I see from the code posted. Therefore, the value in diasEstancia never changes (at one day).