Question

I’m trying to add rows which I selected in one table to another table. I’m not sure how to dynamically append rows. The code I did so far just changes the first row.

int hr = 1;
if ( hr == 1){
    ObservableList<TableColumn<ObservableList<StringProperty>, ?>> header = tableId.getColumns();
    auswTable.getColumns().addAll(header);
    hr = 2;
}
    ObservableList<ObservableList<StringProperty>> content = 
            tableId.getSelectionModel().getSelectedItems();
    auswTable.setItems(content);

Answer 1

right now it just sends one row to table2 and exchanges its content
every time the user clicks the button. I like to add more rows in
table2 from table1.

This was happening because In your code for table2, you set selectedItems observable list as setItems ,so when ever user selected a row/rows in table 1 ,it will automatically added table2. To fix this issue define a new ObserbaleList for table2 and add values from selecteditems to it.

Sample Code :

private  ObservableList<ObservableList<StringProperty>> table2Observable =  
                                            FXCollections.observableArrayList();

private boolean init = true;

  if(init) {

      ObservableList<TableColumn<ObservableList<StringProperty>, ?>> header =  
                          tableId.getColumns();
     auswTable.getColumns().addAll(header);
     auswTable.setItems(table2Observable);
     init = false;
    }

     table2Observable.addAll(tableId.getSelectionModel().getSelectedItems());