Save a file using client-side javascript

[Anjana]

Hi,
I want to load a file,make changes in it and save it using client side javascript.Any
ideas/ suggetsions will be greatly helpful for me.

[Dev Ashish]

You could try some client side Automation with VBScript. Although, IMHO,
this sounds too close to being a virus type app. I would suggest asking the
user to submit the file so that you can change it server-side and
response.binarywrite it back.

-- Dev

"Anjana" <tmmet@hotmail.com> wrote in message
news:38e8eec7$1@news.devx.com...
:
: Hi,
: I want to load a file,make changes in it and save it using client side
javascript.Any
: ideas/ suggetsions will be greatly helpful for me.

[paul larmuseau]

Hi, i want to keep in touch to solve this problem


i read you search a solution for the same problem

i guess or it's something made impossible consiously

http://chart.yahoo.com/table.csv?s=3...1&amp;c=3D199=
5&amp;d=3D2&amp;e=3D2&amp;f=3D1999&amp;g=3Dm&amp;q=3Dq&amp;y=3D0&amp;z=3D=
nite&amp;x=3D.csv

i want to read these data csv data in a string

i tried the same thing as you did, but discovered the same errors

http://www.inquiry.com/techtips/js_p...ro&docID=3D37=
56

i read already something should go with HTMLscript ?

I read also it should go with java applets

Q & A - Reading from URL into String
=20

Applies to These Versions Categories =20
Version Numbers Not Applicable General
=20

-------------------------------------------------------------------------=
-
What is the maximum size of a string array I can have in my =
applet? I am trying to store some stock prices in a string array after =
reading them from a URL connection, but I get an applet exception. What =
is going wrong? Any suggestions?

I suspect you're trying to read the contents of the URL =
using URLConnection.getContent() and that this is not working for you. =
Netscape's implementation of getContent() is known to have bugs when =
it's dealing with simple text files. A better way to read the data into =
your applet is to use InputStreams.=20

For example, if your stock data were stored in a text file =
called "stock.txt" on the Web server and you wanted your applet to read =
the contents of "stock.txt" into a string using a URL, you would do the =
following:

String inputLine;
String stockData =3D "";

URL stockURL =3D new URL(getDocumentBase(), "stock.txt"));
DataInputStream s =3D new DataInputStream(stockURL.openStream());

while ((inputLine =3D s.readLine()) !=3D null) {
stockData =3D stockData + inputLine;
}

s.close();
=20
This will read the contents of "stock.txt" into a single =
String object and allocate memory for it as needed. The String will grow
=
to accommodate the amount of data in the data file. You can then use =
StringTokenizer to read the data out of the String and parse it as you =
see fit.=20

Written by inquiry.com Staff on 3/20/97.
=20
=20



or we should pass through notepad again with an applet ?

Q & A - Copy & Paste
=20

Applies to These Versions Categories =20
Version Numbers Not Applicable AWT
=20

-------------------------------------------------------------------------=
-
How can I copy the selected text from a TextArea to the =
system clipboard or paste from the system clipboard to a TextArea?=20

Java 1.1 introduced the java.awt.datatransfer package, which
=
implements the basic mechanisms for using the system clipboard. It =
defines a Clipboard class through which you can cut and paste arbitrary =
data. To access the system clipboard, you first need to get a reference =
to the default system toolkit with Toolkit.getDefaultToolkit(). Then you
=
can retrieve a Clipboard instance representing the system clipboard by =
calling getSystemClipboard(). Now that you have a reference to the =
system clipboard, all you have to do to implement a copy operation is to
=
fetch the selected text from the TextArea, and set the clipboard =
contents. TextArea selections are accessed with getSelectedText() and =
Clipboard contents are set with setContents(). As you can see, a lot of =
Java programming just involves knowing which methods to call and what =
they do. Pasting from the clipboard involves retrieving its contents =
with getContents() and inserting the text into the TextArea at the =
current cursor position. The accompanying program demonstrates how to =
perform these operations.=20

Of special note is that not all window systems posses the =
same notion of a system clipboard. The X Window system only maintains =
the concept of a current selection, without requiring a cut and paste =
operation. The instant a piece of text is selected, it becomes eligible =
for pasting. Windows 95 and the Mac require you to cut or copy a =
selection before it can be pasted. The system clipboard example program =
will only function as expected in a cut and paste window environment. In
=
the X Window system, a Java program using native peer widgets like =
java.awt.TextArea, will automatically handle selection copying through =
the native window system, and the techniques in the example become =
nonapplicable.=20


import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

public final class ClipboardExample extends Frame {
private TextArea __textArea;
private Button __copyButton, __pasteButton;
private Clipboard __systemClipboard;

public ClipboardExample() {
super("Clipboard Demo");
ActionListener copyListener, pasteListener;

__systemClipboard =3D =
Toolkit.getDefaultToolkit().getSystemClipboard();

__textArea =3D new TextArea("Start typing!");
__textArea.setColumns(30);
__textArea.setRows(20);
__textArea.setEditable(true);

__copyButton =3D new Button("Copy");
__pasteButton =3D new Button("Paste");

copyListener =3D new ActionListener() {
public void actionPerformed(ActionEvent event) {
String selection;
StringSelection stringSelection;

selection =3D __textArea.getSelectedText();
if(selection =3D=3D null)
selection =3D "";

stringSelection =3D new StringSelection(selection);
__systemClipboard.setContents(stringSelection, stringSelection);
}
};

pasteListener =3D new ActionListener() {
public void actionPerformed(ActionEvent event) {
Transferable contents;
String selection;

contents =3D __systemClipboard.getContents(null);
try {
selection =3D=20
(String)contents.getTransferData(DataFlavor.stringFlavor);
System.out.println("FOO");
System.out.println(selection);
__textArea.insert(selection, __textArea.getCaretPosition());
} catch(UnsupportedFlavorException ufe) {
ufe.printStackTrace();
} catch(java.io.IOException ioe) {
ioe.printStackTrace();
}
}
};

__copyButton.addActionListener(copyListener);
__pasteButton.addActionListener(pasteListener);

setLayout(new BorderLayout());
add(__textArea, BorderLayout.CENTER);
add(__copyButton, BorderLayout.NORTH);
add(__pasteButton, BorderLayout.SOUTH);
}

public static void main(String[] args) {
ClipboardExample example;
WindowListener exitListener;

exitListener =3D new WindowAdapter() {
public void windowClosing(WindowEvent e) {
Window window =3D e.getWindow();
window.setVisible(false);
window.dispose();
System.exit(0);
}
};

example =3D new ClipboardExample();
example.addWindowListener(exitListener);
example.pack();
example.setVisible(true);
}
}


Written by Daniel Savarese on 9/15/98.
=20
=20


------=_NextPart_001_000A_01BFA312.EF83BBF0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2516.1900" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi, i want to keep in touch to solve =
this=20
problem</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i read you search a solution for the =
same=20
problem</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i guess or it's something made =
impossible=20
consiously</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://chart.yahoo.com/table.csv?s=3Dintc&amp;amp;a=3D1&amp;amp;b=
=3D1&amp;amp;c=3D1995&amp;amp;d=3D2&amp;amp;e=3D2&amp;amp;f=3D1999&amp;am=
p;g=3Dm&amp;amp;q=3Dq&amp;amp;y=3D0&amp;amp;z=3Dnite&amp;amp;x=3D.csv">ht=
tp://chart.yahoo.com/table.csv?s=3Dintc&amp;amp;a=3D1&amp;amp;b=3D1&amp;a=
mp;c=3D1995&amp;amp;d=3D2&amp;amp;e=3D2&amp;amp;f=3D1999&amp;amp;g=3Dm&am=
p;amp;q=3Dq&amp;amp;y=3D0&amp;amp;z=3Dnite&amp;amp;x=3D.csv</A></FONT></D=
IV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i want to read these data csv data in a
=

string</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i tried the same thing as you did, but =
discovered=20
the same errors</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://www.inquiry.com/techtips/js_pro/answer.asp?pro=3Djs_pro&am=
p;docID=3D3756">http://www.inquiry.com/techtips/js_p...r.asp?pro=3Dj=
s_pro&amp;docID=3D3756</A></FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i read already something should go with
=
HTMLscript=20
?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I read also it should go with java=20
applets</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>
<TABLE border=3D0 cellPadding=3D0 cellSpacing=3D0 width=3D600>
<TBODY>
<TR>
<TD rowSpan=3D10 width=3D10></TD>
<TD vAlign=3Dtop><!-- Answer ASP Code -->
<TABLE>
<TBODY>
<TR>
<TD vAlign=3Dtop><FONT color=3D#000000 face=3DVerdana=20
size=3D4><B>Q&nbsp;&amp;&nbsp;A - Reading from URL into=20
String</B></FONT><BR><IMG border=3D0 height=3D2=20
src=3D"cid:000501bfa302$2bf34ad0$08147bd4@BEHEERDER"=20
width=3D300></TD></TR></TBODY></TABLE><BR>
<TABLE border=3D0 cellPadding=3D2 cellSpacing=3D2 width=3D450>
<TBODY>
<TR>
<TH><FONT face=3DVerdana size=3D2>Applies to These =
Versions</FONT> </TH>
<TH><FONT face=3DVerdana size=3D2>Categories</FONT> </TH></TR>
<TR>
<TD vAlign=3Dtop width=3D200>
<CENTER><I>Version Numbers Not Applicable</I> </CENTER></TD>
<TD vAlign=3Dtop width=3D200><FONT size=3D1><A=20
=
href=3D"http://www.inquiry.com/techtips/java_pro/browse.asp?pro=3Djava_pr=
o&amp;catID=3D484"><IMG=20
border=3D0 hspace=3D5 =
src=3D"cid:000601bfa302$2bf4d170$08147bd4@BEHEERDER"=20
vspace=3D1>General</A><BR></FONT></TD></TR></TBODY></TABLE>
<HR align=3Dleft color=3D#000000 SIZE=3D1 width=3D450>

<TABLE width=3D450>
<TBODY>
<TR>
<TD><FONT size=3D2>
<P><B>What is the maximum size of a string array I can have =
in my=20
applet? I am trying to store some stock prices in a string =
array=20
after reading them from a URL connection, but I get an =
applet=20
exception. What is going wrong? Any suggestions?</B></P>
<P>I suspect you're trying to read the contents of the URL =
using=20
<CODE>URLConnection.getContent()</CODE> and that this is not
=
working=20
for you. Netscape's implementation of =
<CODE>getContent()</CODE> is=20
known to have bugs when it's dealing with simple text files.
=
A=20
better way to read the data into your applet is to use=20
<CODE>InputStreams</CODE>.=20
<P>For example, if your stock data were stored in a text =
file called=20
"stock.txt" on the Web server and you wanted your applet to =
read the=20
contents of "stock.txt" into a string using a URL, you would
=
do the=20
following:<PRE> String inputLine;
String stockData =3D "";

URL stockURL =3D new URL(getDocumentBase(), "stock.txt"));
DataInputStream s =3D new DataInputStream(stockURL.openStream());

while ((inputLine =3D s.readLine()) !=3D null) {
stockData =3D stockData + inputLine;
}

s.close();
</PRE>This will read the contents of "stock.txt" into a single=20
String object and allocate memory for it as needed. The =
String will=20
grow to accommodate the amount of data in the data file. You
=
can=20
then use StringTokenizer to read the data out of the String =
and=20
parse it as you see fit.=20
<P></P>Written by inquiry.com Staff on=20
=
3/20/97.</I><BR></FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABL=
E></FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>or we should pass through notepad again
=
with an=20
applet ?</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>
<TABLE border=3D0 cellPadding=3D0 cellSpacing=3D0 width=3D600>
<TBODY>
<TR>
<TD rowSpan=3D10 width=3D10>&nbsp;</TD>
<TD vAlign=3Dtop><!-- Answer ASP Code -->
<TABLE>
<TBODY>
<TR>
<TD vAlign=3Dtop><FONT color=3D#000000 face=3DVerdana=20
size=3D4><B>Q&nbsp;&amp;&nbsp;A - Copy &amp; =
Paste</B></FONT><BR><IMG=20
border=3D0 height=3D2 =
src=3D"cid:000701bfa302$2bf4d170$08147bd4@BEHEERDER"=20
width=3D300></TD></TR></TBODY></TABLE><BR>
<TABLE border=3D0 cellPadding=3D2 cellSpacing=3D2 width=3D450>
<TBODY>
<TR>
<TH><FONT face=3DVerdana size=3D2>Applies to These =
Versions</FONT> </TH>
<TH><FONT face=3DVerdana size=3D2>Categories</FONT> </TH></TR>
<TR>
<TD vAlign=3Dtop width=3D200>
<CENTER><I>Version Numbers Not Applicable</I> </CENTER></TD>
<TD vAlign=3Dtop width=3D200><FONT size=3D1><A=20
=
href=3D"http://www.inquiry.com/techtips/java_pro/browse.asp?pro=3Djava_pr=
o&amp;catID=3D194"><IMG=20
border=3D0 hspace=3D5 =
src=3D"cid:000801bfa302$2bf65810$08147bd4@BEHEERDER"=20
vspace=3D1>AWT</A><BR></FONT></TD></TR></TBODY></TABLE>
<HR align=3Dleft color=3D#000000 SIZE=3D1 width=3D450>

<TABLE width=3D450>
<TBODY>
<TR>
<TD><FONT size=3D2>
<P><B>How can I copy the selected text from a TextArea to =
the system=20
clipboard or paste from the system clipboard to a TextArea? =
</B></P>
<P>Java 1.1 introduced the java.awt.datatransfer package, =
which=20
implements the basic mechanisms for using the system =
clipboard. It=20
defines a Clipboard class through which you can cut and =
paste=20
arbitrary data. To access the system clipboard, you first =
need to=20
get a reference to the default system toolkit with=20
Toolkit.getDefaultToolkit(). Then you can retrieve a =
Clipboard=20
instance representing the system clipboard by calling=20
getSystemClipboard(). Now that you have a reference to the =
system=20
clipboard, all you have to do to implement a copy operation =
is to=20
fetch the selected text from the TextArea, and set the =
clipboard=20
contents. TextArea selections are accessed with =
getSelectedText()=20
and Clipboard contents are set with setContents(). As you =
can see, a=20
lot of Java programming just involves knowing which methods =
to call=20
and what they do. Pasting from the clipboard involves =
retrieving its=20
contents with getContents() and inserting the text into the =
TextArea=20
at the current cursor position. The accompanying program=20
demonstrates how to perform these operations.=20
<P>Of special note is that not all window systems posses the
=
same=20
notion of a system clipboard. The X Window system only =
maintains the=20
concept of a current selection, without requiring a cut and =
paste=20
operation. The instant a piece of text is selected, it =
becomes=20
eligible for pasting. Windows 95 and the Mac require you to =
cut or=20
copy a selection before it can be pasted. The system =
clipboard=20
example program will only function as expected in a cut and =
paste=20
window environment. In the X Window system, a Java program =
using=20
native peer widgets like java.awt.TextArea, will =
automatically=20
handle selection copying through the native window system, =
and the=20
techniques in the example become nonapplicable.=20
<P><PRE>import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

public final class ClipboardExample extends Frame {
private TextArea __textArea;
private Button __copyButton, __pasteButton;
private Clipboard __systemClipboard;

public ClipboardExample() {
super("Clipboard Demo");
ActionListener copyListener, pasteListener;

__systemClipboard =3D =
Toolkit.getDefaultToolkit().getSystemClipboard();

__textArea =3D new TextArea("Start typing!");
__textArea.setColumns(30);
__textArea.setRows(20);
__textArea.setEditable(true);

__copyButton =3D new Button("Copy");
__pasteButton =3D new Button("Paste");

copyListener =3D new ActionListener() {
public void actionPerformed(ActionEvent event) {
String selection;
StringSelection stringSelection;

selection =3D __textArea.getSelectedText();
if(selection =3D=3D null)
selection =3D "";

stringSelection =3D new StringSelection(selection);
__systemClipboard.setContents(stringSelection, stringSelection);
}
};

pasteListener =3D new ActionListener() {
public void actionPerformed(ActionEvent event) {
Transferable contents;
String selection;

contents =3D __systemClipboard.getContents(null);
try {
selection =3D=20
(String)contents.getTransferData(DataFlavor.stringFlavor);
System.out.println("FOO");
System.out.println(selection);
__textArea.insert(selection, __textArea.getCaretPosition());
} catch(UnsupportedFlavorException ufe) {
ufe.printStackTrace();
} catch(java.io.IOException ioe) {
ioe.printStackTrace();
}
}
};

__copyButton.addActionListener(copyListener);
__pasteButton.addActionListener(pasteListener);

setLayout(new BorderLayout());
add(__textArea, BorderLayout.CENTER);
add(__copyButton, BorderLayout.NORTH);
add(__pasteButton, BorderLayout.SOUTH);
}

public static void main(String[] args) {
ClipboardExample example;
WindowListener exitListener;

exitListener =3D new WindowAdapter() {
public void windowClosing(WindowEvent e) {
Window window =3D e.getWindow();
window.setVisible(false);
window.dispose();
System.exit(0);
}
};

example =3D new ClipboardExample();
example.addWindowListener(exitListener);
example.pack();
example.setVisible(true);
}
}
</PRE>

[ckp21082]

I want javascript code using which i can validate whether selected file is present at client side or not.

I want to check whether file existing or not before posting form to my PHP file.

I want a code which can run on both window and Linux.

Thanx

[srajput]

Hi,
I want to load a open a notepad text file in Javascript,make changes in it and save it using client side javascript.Any
ideas/ suggetsions will be greatly helpful for me.

[Razee Marikar]

I guess my reply will be a disappointment. But it is not possible for client side JavaScript to access the file system in a web browser. It is a security breach, and will not be permitted. If such a possibility is found, it might be a browser bug and could be fixed in the future releases.

In fact, you can't even validate whether a file is present or not using JavaScript. This kind of things will have to be done at server side.

However, the good news is, signing a script gives you some of these privileges. For more details on signing a script, please refer http://www.mozilla.org/projects/secu...d-scripts.html