我现在正在使用Vaadin尝试我的第一个Hello World ,但我坚持使用我的第一个简单验证的 Form。我使用 a作为我的表单,但我不知道如何为 bean 属性添加验证器。BeanItem
ItemDataSource
我的问题
如何获得Field
bean 中属性的实际值?我需要addValidator()
在球场上打电话,但我只能在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("Hello World");
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"));
}
}
你好世界豆
package vaadinapp.hello;
public class HelloWorldBean {
String greeting;
public String getGreeting() {
return greeting;
}
public void setGreeting(String greeting) {
this.greeting = greeting;
}
}