Important Notice - Forums is archived
To simplify things and help our users to be more productive, we have archived the current forum and focus our efforts on helping developers on Stack Overflow. You can post new questions on Stack Overflow or join our Discord channel.

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.
FormLayout Problem
Hello,
I am trying to build a form. Everything works if i use a VerticalLayout in Form constructor
Form frm = new Form(new VerticalLayout)
but with this layout textfield labels are shown above the Textfield and i don't want that.
I want the the labels to appear on the left side.
When i use the default constructor of the Form or if i use FormLayout
Form frm = new Form()
Form frm = new Form(new FormLayout)
when my form is not visible and i get in vaadin debug console this error "ClassCastException: null"
also it tells me "com.vaadin.ui.FormLayout(NO CLIENT IMPLEMENTATION FOUND)"
any help please?
Thank you in advance.
Nick
You can try something like that:
Form form = new Form();
GridLayout grid = new Grid(2, 2);
form.setLayout(grid);
form.setItemDataSource( /* your data source - for example BeanItem */ );
//from Form
@Override
protected void attachField(Object propertyId, Field field) {
if (propertyId.equals(UserBean.Label_1)) {
layout.addComponent(new Label("left Label"), 1, 0);
} else if (propertyId.equals(UserBean.Text_1)) {
layout.addComponent(field, 1, 1);
}
}
for field-editing you should something similar to DefaultFieldFactory, creat your own or let your class extend it.
Form uses FormLayout as its default layout so you should never need to set it explicitly.
Nick Sideras: when my form is not visible and i get in vaadin debug console this error "ClassCastException: null"
also it tells me "com.vaadin.ui.FormLayout(NO CLIENT IMPLEMENTATION FOUND)"
This looks like you are using the wrong widgetset version or a widgetset that was not compiled correctly.
Check that you don't have two different Vaadin JARs on your classpath.