How to validate a field from a BeanItem in Vaadin?

You can't add validators to a Property directly. Validators have to be added to the Field itself (fields in a Form or a standalone TexField forexample).

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I'm trying my first Hello World with Vaadin right now and I'm stuck with my first simple validated Form. I'm using a BeanItem as the ItemDataSource for my form, and I don't know how to add a Validator for the bean property. My Problem How can I get the actual Field for the property in my bean?

I need to call addValidator() on the field, but I can only get it on the Form. HelloWorldForm package vaadinapp. Hello; import com.vaadin.data.util.

BeanItem; import com.vaadin.ui. Alignment; import com.vaadin.ui. Button; import com.vaadin.ui.

Form; import com.vaadin.ui. HorizontalLayout; import com.vaadin.ui. Label; import com.vaadin.ui.

VerticalLayout; public class HelloWorldForm extends Form { HelloWorldBean data = new HelloWorldBean(); public HelloWorldForm() { setCaption(" setDescription("This is a simple form that lets you enter your name and displays a greeting. "); setItemDataSource(new BeanItem(data)); setFooter(new VerticalLayout()); getFooter(). AddComponent( new Label("This is the footer area of the Form.

You can use any layout here. This is nice for buttons. ")); // Have a button bar in the footer.

HorizontalLayout okbar = new HorizontalLayout(); okbar. SetHeight("25px"); getFooter(). AddComponent(okbar); // Add an Ok (commit), Reset (discard), and Cancel buttons // for the form.

Button okbutton = new Button("OK", this, "commit"); okbar. AddComponent(okbutton); okbar. SetComponentAlignment(okbutton, Alignment.

TOP_RIGHT); okbar. AddComponent(new Button("Reset", this, "discard")); okbar. AddComponent(new Button("Cancel")); } } HelloWorldBean package vaadinapp.

Hello; public class HelloWorldBean { String greeting; public String getGreeting() { return greeting; } public void setGreeting(String greeting) { this. Greeting = greeting; } } validation forms form-validation vaadin link|improve this question asked Oct 7 '10 at 6:46cringe1,25511444 67% accept rate.

You can't add validators to a Property directly. Validators have to be added to the Field itself (fields in a Form or a standalone TexField forexample). Take a look at the chapter 5.17.3 in the Book of Vaadin for validating a Form: vaadin.com/book/-/page/components.form.html (Note that there is also getField(id) method in the Form you can use instead of the FieldFactory).

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