Argthtjtr

I am trying to populate Vaadin 8 Grid and one column has the type double. I am loading the Data into the table by combining it with a bean. I did it the following way,

Tasks bean:

public class Tasks{

    private int id;

    private Double duration;



    public StakeholderTasks(int i, String string) {

        this.id = id;

        this.taskName=taskName;

        // TODO Auto-generated constructor stub

    }

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public Double getDuration() {

        return duration;

    }

    public void setDuration(Double duration) {

        this.duration = duration;

    }

}

TasksImpl:

public class stakeholderImpl extends CustomComponent {

    private Grid < Tasks > grid1;

    private Binder < Tasks > binder = new Binder < > (Tasks.class);

    cmpy = datastoreinstance.updateTaskList();

    provider1 = new ListDataProvider < > (cmpy);

    grid1 = new Grid < > ();

    grid1.addColumn(Tasks::getDuration);

    grid1.asSingleSelect().addValueChangeListener(event -> {



      form.setVisible(false);



      window = createWindow(window,

       ((MainUI)(UI.getCurrent())).getLanguageMessage("general.addnewtask"),

       event.getValue(), "EDIT", form);

     }

     catch (ClassNotFoundException e1) {

      // TODO Auto-generated catch block

      e1.printStackTrace();

     } catch (SQLException e1) {

      // TODO Auto-generated catch block

      e1.printStackTrace();

     }



 }



});



binder.forField(duration).asRequired(((MainUI)(UI.getCurrent())).getLanguageMessage("general.required"))

      .withValidator(new RegexpValidator(((MainUI)(UI.getCurrent())).getLanguageMessage("general.numerror"), DBConstants.regex))

      .bind(taskdetails -> nf_out.format(stakeholders.getDuration()),

      (taskdetails, formValue) -> 

      {

          NumberFormat nf_in = NumberFormat.getNumberInstance(Locale.GERMANY);

          double val = 0 d;

          try {

             val = nf_in.parse(formValue).doubleValue();

             taskdetails.setDuration(val);

          } catch (ParseException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

      }

  });

}

When I click on a row in the grid, then get the values from that row, load a form and then after save, show values in the grid. What I did in the binder for duration was validate the values for double based on LOCALE.GERMANY and else validate using regex(regex= "[0-9]+([.,][0-9]{1,2})?";)

The problems I am facing are:

• I am gettign . instead of , for decimal notations in the grid (in the database it has ,)



• When I click on the grid, the column Duration doubles the number of zeroes. For eg: if the value in the grid is 10.0 upon clicking on it, the value changes to 10000.00 or 1000.00. Is there a way to load the grid based on Locale for Germany?




• I know that I have not handled this correctly. Is there a better way to do this? Could someone just guide me through this. I am learning Vaadin now and I cannot get this working properly.

One alternative and simple approach would be that instead you could use the StringToDoubleConverter of the framework. By default it uses NumberFormat.getNumberInstance(locale) for number format. If you want something else than the default number format of your local, you can extend StringToDoubleConverter and override getFormat method to return customized NumberFormat.