Clear the renderer from a Grid column in Vaadin 8.1

Question

In Vaadin Framework 8.1 app, on the Grid widget, how does one clear a column renderer after setting it?

We can set a renderer on a Grid.Column by calling setRenderer. How to un-set it?

Passing null results in a null pointer exception:

java.lang.NullPointerException: Renderer can not be null

The default behavior before setting the renderer seems to be simply calling toString on the column’s objects.

➟ How get back to that default behavior?

Answer 1

There is no way to ask Vaadin to revert to default.

Before setting the new renderer, you can ask for the existing default renderer.

Renderer<?> r = this.columnInstant.getRenderer() ;

Then later re-apply it.

myGridColumn.setRenderer( r ) ;

Commonly, the default renderer is com.vaadin.ui.renderers.TextRenderer. You can instantiate a new one if that is more convenient than retaining a reference to the old one.

myGridColumn.setRenderer( new com.vaadin.ui.renderers.TextRenderer() ) ;