JavaScript: How to check if a file exists.

Hello Everybody,
Can you tell me how to check if a file exists using JavaScript and Internet Explorer.
Browsing on this website I could read about the command "f.exists()" and it was necessary to include "java.io.*".
Should I use this same command and should I include the same files? Or are there other files and other commands?
Thanks in advance.

sorry ya. there is no command to check whether a file exists using javascript. The following code says the object name and value. But it can't say whether the file exists in the harddisk or .. Javascript cannot access database and system resources. If the file exists or not can be checked through the application (ASP, CFML, ..) you are using.

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Look at the class java.io.File and the .exists() method:
http://java.sun.com/j2se/1.4/docs/api/java/io/File.html

How to check whether a file exists or not

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Haii ameen
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<%
ServletConfig cf=getServletConfig();
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SQL> declare
2   lb_file_exist boolean;
3   ln_size number;
4   ln_block_size number;
5 begin
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9    dbms_output.put_line(to_char(ln_size));
10   else
11    dbms_output.put_line('a Not Exists');
12   end if;
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14   if lb_file_exist then
15    dbms_output.put_line('b Exists');
16    dbms_output.put_line(to_char(ln_size));
17   else
18    dbms_output.put_line('b Not Exists');
19   end if;
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21   if lb_file_exist then
22    dbms_output.put_line('c Exists');
23    dbms_output.put_line(to_char(ln_size));
24   else
25    dbms_output.put_line('c Not Exists');
26   end if;
27 end;
28 /
a Exists
0
b Exists
3
c Not Exists
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if webutil_file_transfer.DB_To_Client_With_Progress
( file_path ,
'BIN_DOCS',
'DOC' ,
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How about something like the below:
Note: I have a yes/no alert to asking if they want to over-write the existing file.
DECLARE
file_path VARCHAR2(2000) := null;
over_write BOOLEAN := TRUE;
BEGIN
/** I ask where saving the file on the client machine **/
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(directory_name => null,
file_name => :bin_docs.name,
file_filter => '',
title => 'Saving file',
dialog_type => save_file, --save_file
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( file_path ,
'BIN_DOCS',
'DOC' ,
'doc_id = '||:bin_docs.doc_id,
'Downloading file',
' '||:bin_docs.name) then
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END;
cheers
Q

How to check if the file already exists in the application server directory

Hi all. I'm on devsuite 10g.
I transfer file from local machine to application server using webutil function webutil_file_transfer.client_to_as and I want to check if the file I'm transfering already exists on the server directory.
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use the text_io package and open the file in read-mode.
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declare
xFileType text_io.file_type;
begin
xFileType := text_io.fopen('c:\temp\test.txt','R'); --file on the middle tier
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text_io.fclose(xFileType);
exception
when others then
--file doesn't exist
end;
regards
Christian

How to check if a file already exists or not

javax.swing.filechooser.FileFilter filter = new FileNameExtensionFilter("CSV Files","csv");
               final JFileChooser fileSelect = new JFileChooser();
               fileSelect.addChoosableFileFilter(filter);
               int action = fileSelect.showSaveDialog(JFrame)
               try{
                    if (action == JFileChooser.CANCEL_OPTION)
                         return;
                    else if (action == JFileChooser.APPROVE_OPTION)
                         SwingUtilities.invokeLater(new Runnable()
                              public void run()
                                   file = fileSelect.getSelectedFile();
                                   JOptionPane.showMessageDialog(null,file);
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                                   final String fileName = ((BasicFileChooserUI)fileSelect.getUI()).getFileName();
                                   if(!fileName.endsWith(".csv"))
                                        //appends the file type to the fetched filename
                                        ((BasicFileChooserUI)fileSelect.getUI()).setFileName(fileName + ".csv");
                                   final String newFileName = ((BasicFileChooserUI)fileSelect.getUI()).getFileName();
                                   //replace the oldfile with filename.csv
                                   String csvFile = file.getPath().replace(file.getPath().substring(file.getPath().lastIndexOf('\\') + 1,file.getPath().length()),"");
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                                        int response = JOptionPane.showConfirmDialog (null,
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                                        if (response == JOptionPane.CANCEL_OPTION)
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                                             try
                                                  writeToFile();
                                             catch (IOException e)
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                                        try
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                                        catch (IOException e)
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Thank u very much
I got the solution for it
if(ae.getActionCommand().equals("Export"))
               data= new Vector();
               data.addAll(tabData);
               javax.swing.filechooser.FileFilter filter = new FileNameExtensionFilter("CSV Files(*.csv)","csv");
               final JFileChooser fileSelect = new JFileChooser();
               fileSelect.addChoosableFileFilter(filter);
               int action = fileSelect.showSaveDialog(MainFrame.getMainFrame());
               try{
                    if (action == JFileChooser.CANCEL_OPTION)
                         return;
                    else if (action == JFileChooser.APPROVE_OPTION)
                         SwingUtilities.invokeLater(new Runnable()
                              public void run()
                                   file = fileSelect.getSelectedFile();
                                   //fetches the file name from the file name filed in the GUI
                                   final String fileName = ((BasicFileChooserUI)fileSelect.getUI()).getFileName();
                                   if(!fileName.endsWith(".csv"))
                                        //appends the file type to the fetched filename
                                        ((BasicFileChooserUI)fileSelect.getUI()).setFileName(fileName + ".csv");
                                   final String newFileName = ((BasicFileChooserUI)fileSelect.getUI()).getFileName();
                                   //replace the oldfile with filename.csv
                                   String csvFile = file.getPath().replace(file.getPath().substring(file.getPath().lastIndexOf('\\') + 1,file.getPath().length()),"");
                                   JOptionPane.showMessageDialog(null,csvFile);
                                   if (csvFile.endsWith("\\" + "\\"))
                                        csvFile = csvFile.concat(fileName.concat("\\"));
                                   file = new File(csvFile.concat(newFileName));
                                   if(file.exists())
                                        int response = JOptionPane.showConfirmDialog (null,
                                                  "Overwrite existing file?","Confirm Overwrite",
                                                  JOptionPane.OK_CANCEL_OPTION,
                                                  JOptionPane.QUESTION_MESSAGE);
                                        if (response == JOptionPane.CANCEL_OPTION)
                                             return;
                                        else
                                             try
                                                  writeToFile();
                                             catch (IOException e)
                                                  e.printStackTrace();
                                   else
                                        try
                                             writeToFile();
                                        catch (IOException e)
                                             e.printStackTrace();
               catch(Exception e)
                    e.printStackTrace();
Message was edited by:
vijaysforum

How to check whether a file is present in the UNIX directory of app. server

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I'm trying to check if the path given by the user already exists. In case it doesn't, I'd like to create a folder with name given in the same directory.
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hi guys,
i`m new at this so im gonne prob. ask a noob`s question...
i have the same issue as in the title.
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folderexist = GetFileAttrs (name, &a, &b, &c, &d);
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MakeDir (name);
sprintf...........
else.......
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thanks
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JavaScript: How to check if a file exists.

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