ComboBox Converter

Vaadin 6 / 7 / 8 Framework UI
1

Hello Vaadin gurus,

I am trying to apply a converter to combobox and having extremely difficulty getting it work.

Issue #1 - When I apply a converter to a combobox Eclispse Luna flashes a warning. I read the forum for a solution and tried casting the converter and still the issues does not go away. When I execute the below code, I get a NullPointerException.

/**

  • @return the filingMonth
    */
    private ComboBox getFilingMonth() {
    if (filingMonth == null) {
    filingMonth = new ComboBox(“Filing Month”);
    filingMonth.setWidth(FilingForm.FIELD_WIDTH);
    filingMonth.setNullSelectionAllowed(false);
    filingMonth.addItems(YearMonthUtil.getMonthNames());

    filingMonth.setConverter((Converter) new MonthStringToInt());

    }
    return filingMonth;
    }

Issue #2 - My data source (model) the filing month is an integer value. However, the combobox items (view) will display the month name. Since I cannot get the bean to register, I tried extending the combobox and and override the getValue() and setValue() mehtods. That didn’t work out as well.

private void bindBeanToForm() {
if (binder == null) {
binder = new FieldGroup();
binder.setBuffered(true);
}

binder.setItemDataSource(new BeanItem(this.filing));
binder.bind(filingMonth, “filingMonth”);
}

Is my approach correct or am I not using Converter properly.

Thanks.

2

Hi,

I guess this article may help you: https://vaadin.com/wiki/-/wiki/Main/Creating+your+own+converter+for+String+-+MyType+conversion

3

The Book of Vaadin has some details that may be useful for you as well: https://vaadin.com/book/vaadin7/-/page/datamodel.properties.html

4

Thanks…I have already read both article. I can get the converters to work with textfield fine. However, I cannot get converters to work with comboboxes.