Develop Reference

Is it possible jtable row in optionDialog box

I have a jtable.
Some of the cells contain very long strings and trying to scroll left and right through it is difficult. My question is whether it is possible to show a row from a JTable in a pop-up eg showDialog type box (ie where the selected row is organised as a column).
Even a link to a tutorial would do.
I have scoured the internet but I don't think I'm really using the correct keywords as I get a lot of right-click options.
If this is not possible are there any other suggestions for how to do this?

As shown here, the JOptionPane factory methods will display the Object passed in the message parameter. If that message is a one column JTable, you can recycle any custom renderers and editors that were applied to the original table.
In outline,
Add a ListSelectionListener to your table and get the selectedRow.
Iterate through the table's model and construct a newModel whose rows are the columns of the selectedRow.
Create a JTable newTable = new JTable(newModel).
Apply any non-default renderers and editors.
Pass a new JScrollPane(newTable) as the message parameter to your chosen JOptionPane method.
Starting from this example, the following listener displays the dialog pictured.
table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent e) {
int selectedRow = table.convertRowIndexToModel(table.getSelectedRow());
if (selectedRow > -1) {
DefaultTableModel newModel = new DefaultTableModel();
String rowName = "Row: " + selectedRow;
newModel.setColumnIdentifiers(new Object[]{rowName});
for (int i = 0; i < model.getColumnCount(); i++) {
newModel.addRow(new Object[]{model.getValueAt(selectedRow, i)});
}
JTable newTable = new JTable(newModel) {
#Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(140, 240);
}
};
// Apply any custom renderers and editors
JOptionPane.showMessageDialog(f, new JScrollPane(newTable),
rowName, JOptionPane.PLAIN_MESSAGE);
}
}
});

I want to show all the values in the row, each in their cel, organised vertically- that's what I meant by 'in a column'.
That should be in the question, not in the comment.
There is no default functionality for this but you can do it yourself.
You could create a JPanel (maybe using a GridBagLayout), with two labels in a row to represent the data in a column of the selected row of the table.
For the data in the first label you would use the getColumnName(...) method of the TableModel.
For the data in the second label you would use the getValueAt(...) method of the TableModel.
Another option is to simply display a tool tip for the cell. See the section from the Swing tutorial on Specifying ToolTips For Cells for more information.

You may use the following ListSelectionListener:
final JTable dialogTable =new JTable();
table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent event) {
int selectedRow = table.getSelectedRow();
if (selectedRow > -1) {
int columnCount = table.getModel().getColumnCount();
Object[] column = new Object[]{"Row "+(selectedRow+1)};
Object[][] data = new Object[columnCount][1];
for (int i = 0; i < columnCount; i++) {
Object obj = table.getModel().getValueAt(selectedRow, i);
data[i][0] = obj;
}
dialogTable.setModel(new DefaultTableModel(data, column));
JOptionPane.showMessageDialog(null, new JScrollPane(dialogTable));
}
}
});
This is going to show a message dialog which contains a JTable with data that is derived from the selected row. Hope this helps you.

how do I determine which columns in a JTable are visible

I'm resizing my columns according to their data with the following:
/**
* Set the widths of the columns in the table according to the data in the table.
* #param table
*/
private static void setColumnWidths(JTable table)
{
int columnCount = table.getModel().getColumnCount();
int rowCount = table.getModel().getRowCount();
TableColumnModel columnModel = table.getColumnModel();
for (int col=0; col<columnCount; col++)
{
TableColumn column = columnModel.getColumn(col);
TableCellRenderer renderer = column.getCellRenderer();
if (renderer == null)
{
renderer = new DefaultTableCellRenderer();
}
int overallColumnWidth = 0;
for (int row = 0; row < rowCount; row++)
{
Object value = table.getValueAt(row, col);
Component component = renderer.getTableCellRendererComponent(table, value, false, false, row, col);
int componentWidth = (int) component.getPreferredSize().getWidth();
overallColumnWidth = Math.max(componentWidth, overallColumnWidth);
}
column.setPreferredWidth(overallColumnWidth);
}
}
This works when all the columns are visible, but I've got code that hides some of them (JTable.removeColumn(TableColumn column)). It appears that both the JTable instance and the TableColumnModel instance have the list of data columns, i.e., all columns regardless of visibility. How can I get a list of only columns that are visible, or test whether a given column is visible?
(I've searched for this, but get longs lists of articles on how to hide the columns, and no explanation of where the visible/invisible information is kept. I thought, since I asked the JTable to hide the column, that somewhere in there it would know which columns were hidden and I could get that info.)

Check if table.convertColumnIndexToView(col) returns -1.
From the documentation:
public int convertColumnIndexToView(int modelColumnIndex)
Maps the index of the column in the table model at modelColumnIndex to
the index of the column in the view. Returns the index of the
corresponding column in the view; returns -1 if this column is not
being displayed. If modelColumnIndex is less than zero, returns
modelColumnIndex.
Source

The problem with your code if that your loops is controlled by the values returned in the TableMdoel.
Instead you should be using values from the table:
int rowCount = table.getRowCount();
int columnCount = table.getRowCount();
Then there is no need for exception logic to determine if a column is visible or not because by default it will be visible because it is the job of the view (JTable) to only display visible columns.
You need to understand the difference between the "view" and the "model".
how do I determine which columns in a JTable are visible
So the better answer is to use the methods of the JTable. Your current solution confuses the view and model.
You could also use the Table Column Adjuster to do the column adjustment for you. It provides features like dynamically resizing the column as the data changes.

How can i clear the all contents of the cell data in every row in my tableview in JAVA FX

I am finding hard to clear the table contents in my table. I have tried this code.
for ( int i = 0; i<resultTable.getItems().size(); i++) {
resultTable.getItems().clear();
}
To clarify my question, the problem I am having is that i want to delete the values in my table. This was the first code i used;
public void removeRow(){
allFiles = table.getItems(); fileSelected = table.getSelectionModel().getSelectedItems();
fileSelected.forEach(allFiles :: remove);
}
But it only removes a particular selected row. I want to clear all the rows and leave the table empty at once, without having to select any row. I tried to use this code;
public void removeAllRows(){
for ( int i = 0; i<resultTable.getItems().size(); i++) {
resultTable.getItems().clear();
}
}
but it does not clear all the rows in the table
My plan is to use this method as an action for a button.
e.g
Button btn = new ("Clear Table");
btn..setOnAction(e->{removeAllRows();});
When this button is clicked, it should delete all rows in the table at once.

tableView.getItems().clear()
Will do the trick

Try using the following: Name "tableView" to whatever your FXMLtable is called
for ( int i = 0; i<tableView.getItems().size(); i++) {
tableView.getItems().clear();
}

How to print out specific rows/columns of a JTable?

I am able to print a full JTable, but actually I would like more to print just a specific part of a JTable, for example from Row 10 to Row 50 and Column 70 to Column 150.
How to do it ?

I've faced this problem too. Solved by hiding columns before printing and restoring columns after printing:
// get column num from settings
int num = gridSettings.getColumnsOnPage();// first <num> columns of the table will be printed
final TableColumnModel model = table.getColumnModel();
// list of removed columns. After printing we add them back
final List<TableColumn> removed = new ArrayList<TableColumn>();
int columnCount = model.getColumnCount();
// hiding columns which are not used for printing
for(int i = num; i < columnCount; ++i){
TableColumn col = model.getColumn(num);
removed.add(col);
model.removeColumn(col);
}
// printing after GUI will be updated
SwingUtilities.invokeLater(new Runnable() {
public void run() {
// table printing
try {
table.print(PrintMode.FIT_WIDTH, null, null, true, hpset, true); // here can be your printing
} catch (PrinterException e) {
e.printStackTrace();
}
// columns restoring
for(TableColumn col : removed){
model.addColumn(col);
}
}
});
For printing your specific part of a JTable, just change a little bit this code.

Get cell bounds for the selected fragment and calculate desired region (Rectangle), define clip region to paint only desired region, in the printable use Graphics's translate() method to shift the rendering.

How to use hidden column data of jTable in tooltip

I am trying to display the data of hidden column as tooltip. Hiding is working perfectly using the following code:
JTable table = new JTable(model){
//Implement table cell tool tips.
public String getToolTipText(MouseEvent e) {
String tip = null;
java.awt.Point p = e.getPoint();
int rowIndex = rowAtPoint(p);
int colIndex = columnAtPoint(p);
int realColumnIndex = convertColumnIndexToModel(colIndex);
try {
tip = getValueAt(rowIndex, 8).toString();
} catch (RuntimeException e1) {
//catch null pointer exception if mouse is over an empty line
}
return tip;
}
};
TableColumnModel tcm = table.getColumnModel();
TableColumn tc;
for(int i = 1; i <= 7; i++){
tc = tcm.getColumn(8);
tcm.removeColumn(tc);
}
But the tooltip is not showing the data of hidden column (getValue function is not returning value). So do hiding the column delete the data as well ?

You do not need to for loop as you do not use the i variable ;-)
The removeColumn on the JTable does not remove the data from the model, as clearly stated in the javadoc
Removes aColumn from this JTable's array of columns. Note: this method does not remove the column of data from the model; it just removes the TableColumn that was responsible for displaying it.
There is no mention in the javadoc for the same method on the TableColumnModel, but I would assume it works the same way, but you can always give it a try to call it on the JTable instead
The real problem in your code is the use of getValueAt, which uses the row and column index of the table, and not of the model
Note: The column is specified in the table view's display order, and not in the TableModel's column order. This is an important distinction because as the user rearranges the columns in the table, the column at a given index in the view will change. Meanwhile the user's actions never affect the model's column ordering.
And since you removed that column, it simply does not exists for the table. Call the getValue method on the model instead, and do not forget to convert the row index