When a org.zkoss.zul.Grid is assigned with a model, a default renderer is assigned too (see the Model-driven Display ). The default renderer will assume that each row has only one column, and it converts the data into a string directly¹. If you want to display multiple columns or retrieve a particular field of the data, you have to implement org.zkoss.zul.RowRenderer to handle the rendering and assign it by setRowRenderer().

For example,

public class FoodGroupRenderer implements RowRenderer, java.io.Serializable {
    public void render(Row row, Object obj, int index) {
        if (row instanceof Group) {
            row.appendChild(new Label(obj.toString()));
        } else {
            User user = (User) obj;
            row.appendChild(new Label(user.getName()));
            row.appendChild(new Label(user.getDescription()));
            row.appendChild(new Label(user.getDomain()));
        }
    }
}

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Version History

Version	Date	Content
6.0.0	February 2012	The index argument was introduced.

1. If the grid is assigned a template called model, then the template will be used to render the grid. For more information, please refer to the Grid Template section. ↩