Vaadin: TextArea scrolling doesn't work - textarea

Question

I have something similar to this code:
TextArea textArea = new TextArea();
textArea.setSizeFull();
Panel dataPanel = new Panel("Panel", textArea);
dataPanel.setSizeFull();
textArea.setValue(... some very long text...);
The problem is that this TextArea appears without vertical scrollbar (and mouse-wheel scrolling also doesn't work), although inner text is longer than TextArea height (I can navigate lower using cursor and keyboard down arrow).
How do I enable scrolling in this component?

Answer 1

A bit weird, but as per the documentation if you disable word-wrapping in a text-area, you'll get the vertical scroll-bar:
Word Wrap
The setWordwrap() sets whether long lines are wrapped ( true - default) when the line length reaches the width of the writing area. If the word wrap is disabled (false), a vertical scrollbar will appear instead. The word wrap is only a visual feature and wrapping a long line does not insert line break characters in the field value; shortening a wrapped line will undo the wrapping.
The following code sample illustrates this behaviour with Vaadin 8.0.6. Please note my class extends Panel to match your sample but at this point you can eliminate it:
public class PanelWithScrollableTextField extends Panel {
public PanelWithScrollableTextField() {
TextArea textArea = new TextArea();
textArea.setWordWrap(false);
textArea.setSizeFull();
setContent(textArea);
setSizeFull();
StringBuffer buffer = new StringBuffer();
IntStream.range(1, 100).forEach(value -> buffer.append(value).append("\r\n"));
textArea.setValue(buffer.toString());
}
}
Result:
P.S. I know it's a bit weird to grasp, but panels are used to scroll surfaces that are larger then the panel size, so if we'd get it working, you'd be scrolling the text area itself, not its content. You can see below a sample to better understand what I mean:
public class PanelWithScrollableTextField extends Panel {
public PanelWithScrollableTextField() {
TextArea textArea = new TextArea();
textArea.setWordWrap(false);
textArea.setHeight("500px"); // fixed size with height larger than the panel
setContent(textArea);
setHeight("100px"); // fixed height smaller than the content so we get a scroll bar
StringBuffer buffer = new StringBuffer();
IntStream.range(1, 100).forEach(value -> buffer.append(value).append("\r\n"));
textArea.setValue(buffer.toString());
}
}
Result:

Answer 2

You can change it CSS also like below .
.v-textarea { overflow-y: auto ! important;}