How to scroll a JTable to a specific value?

Question

I have a JTable displaying the contents of a log file, and the first column is a timestamp with milliseconds (e.g. 10:31:54.531). The data is already ordered by this column. I would like to allow the user to scroll to the timestamp he is interested in.

Here is a Java snippet of what I would like to do:

String myTimestamp = "10:31:54.531";
Integer myRowIndex = getRowIndexFromStringTimestamp(myTimestamp);
myJTable.getSelectionModel().setSelectionInterval(myRowIndex, myRowIndex);
myJTable.scrollRectToVisible(new Rectangle(myJTable.getCellRect(myRowIndex, 0, true)));

But how to implement getRowIndexFromStringTimestamp?

Thank you

score 3 · Answer 1 · edited May 23 '17 at 12:05

3

I think to use Filtering instead, is easiest than looping and searching in XxxTableModel or JTables view for comparing the desired value
have to set proper ColumnClass for (java.util.Date) for column contains Date(DateTime) value
otherwise have to loop and search in XxxTableModel or JTables view, with comparing the value

edited May 23 '17 at 12:05

Community

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answered Jan 21 '13 at 18:51

mKorbel

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Thank you! I shall try the filtering and get one row index (in model) after filtering, then I can remove the filtering and scroll to this row index I guess – jon Jan 21 '13 at 19:52

MadProgrammer · Accepted Answer · 2013-01-21T20:27:47.837

3

You need a reference to the table and use a combination JTable#getRowCount, JTable#getValueAt

int matchIndex = -1;
for (int rowIndex = 0; rowIndex < myJTable.getRowCount(); index++) {
    Object value = myJTable.getValueAt(rowIndex, colIndex);
    if (value.equals(timestamp)) { // Or what ever comparison you need..
        matchIndex = rowIndex;
        break;
    } 
}
return matchIndex;

The problem with this is will get slower with more data.

edited Jan 21 '13 at 20:27

answered Jan 21 '13 at 19:56

MadProgrammer

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Thanks, I'll give it a try. The users should not load more than 150k rows, which is roughly 1 day of data (it's easier for them to load the entire day and then jump at different point in time) – jon Jan 21 '13 at 20:01
1

Wouldn't a binary search be appropriate? The entries are sorted after all. – lhballoti Jan 21 '13 at 21:47
@lhballoti Assuming the data in the model was sorted, yes. – MadProgrammer Jan 21 '13 at 22:10
I just tried it (no binary search) and the performance is fast on 150k rows, so that works for me! – jon Jan 22 '13 at 10:53

How to scroll a JTable to a specific value?

2 Answers2