Archive - Javascript

"They can because they think they can." - Virgil

◄.Contents.►

Copy
Move
Delete
Rename
Message Popup
Cycle through list

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∆ Fading Function

Script Code
<script type="text/javascript">
window.onload = FadeFunction
var i = 0
function FadeFunction() {
if (i < 350) {
i=i+3
}
var d = document.body.style
d.filter = "alpha(Opacity="+i+")"
d.opacity = i/350
var num = document.all ? 5 : 350
setTimeout("FadeFunction()",num)
}

</script>

∆ Blinking Text

Script Code
<script type="text/javascript">

function done(){
var el=document.getElementById('blinker');

// IE has problems with setAttribute on 'style'
// el.setAttribute('style','color: #f00; text-decoration: none;');
// set directly
el.style.color='#f00';
el.style.textDecoration='none';
el.firstChild.nodeValue="DO NOT RESTART COMPUTER Installing Office 2010";
var t=setTimeout("countdown()",3800); //3.8 seconds
}

function countdown(){
var el=document.getElementById('blinker');
el.style.color='#88f';
el.style.textDecoration='blink';
var t=setTimeout("done()",3800); //3.8 seconds
}

// attach event after page loads
if( window.addEventListener ) {
window.addEventListener('load',countdown,false); //legacy
} else if( document.addEventListener ) {
document.addEventListener('load',countdown,false); //proper
} else if( window.attachEvent ) {
//window.attachEvent("onload", countdown); //IE only
}

</script>

∆ Suppress Key Input

Script Code
<script type="text/javascript">
function SupressRefresh(){
if (event.keyCode==116){event.returnValue=false} //116 is F5
}
document.onkeydown = SupressRefresh
</script>

∆ Gradient Color Change

Script Code
<script type="text/javascript">

//top.resizeTo(300,200);
//top.moveTo(0,0);

// Select fade-effect below:
// Set 1 if the background may fade from dark to medium
// Set 2 if the background may fade from light to medium
// Set 3 if the background may fade from very dark to very light light
// Set 4 if the background may fade from light to very light
// Set 5 if the background may fade from dark to very dark
var fade_effect=2

// What type of gradient should be applied Internet Explorer 5x or higher?
// Set "none" or "horizontal" or "vertical"
var gradient_effect="vertical"

// Speed higher=slower
var speed=40

///////////////////////////////////////////////////////////////////////////
// CONFIGURATION ENDS HERE
///////////////////////////////////////////////////////////////////////////

var browserinfos=navigator.userAgent
var ie4=document.all&&!document.getElementById
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns4=document.layers
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)
var browserok=ie4||ie5||ns4||ns6||opera

if (fade_effect==1) {
var darkmax=1
var lightmax=127
}
if (fade_effect==2) {
var darkmax=127
var lightmax=254
}
if (fade_effect==3) {
var darkmax=1
var lightmax=254
}
if (fade_effect==4) {
var darkmax=190
var lightmax=254
}
if (fade_effect==5) {
var darkmax=1
var lightmax=80
}
var hexc = new Array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F')

var newred
var newgreen
var newblue
var oldred
var oldgreen
var oldblue

var redcol_1
var redcol_2
var greencol_1
var greencol_2
var bluecol_1
var bluecol_2
var oldcolor
var newcolor
var firsttime=true

var stepred=1
var stepgreen=1
var stepblue=1

function setrandomcolor() {
var range=(lightmax-darkmax)
if (firsttime) {
newred=Math.ceil(range*Math.random())+darkmax
newgreen=Math.ceil(range*Math.random())+darkmax
newblue=Math.ceil(range*Math.random())+darkmax
firsttime=false
}

oldred=Math.ceil(range*Math.random())+darkmax
oldgreen=Math.ceil(range*Math.random())+darkmax
oldblue=Math.ceil(range*Math.random())+darkmax

stepred=newred-oldred
if (oldred>newred) {stepred=1}
else if (oldred<newred) {stepred=-1}
else {stepred=0}

stepgreen=newgreen-oldgreen
if (oldgreen>newgreen) {stepgreen=1}
else if (oldgreen<newgreen) {stepgreen=-1}
else {stepgreen=0}

stepblue=newblue-oldblue
if (oldblue>newblue) {stepblue=1}
else if (oldblue<newblue) {stepblue=-1}
else {stepblue=0}
fadebg()
}

function fadebg() {
if (newred==oldred) {stepred=0}
if (newgreen==oldgreen) {stepgreen=0}
if (newblue==oldblue) {stepblue=0}
newred+=stepred
newgreen+=stepgreen
newblue+=stepblue

if (stepred!=0 || stepgreen!=0 || stepblue!=0) {
redcol_1 = hexc[Math.floor(newred/16)];
redcol_2 = hexc[newred%16];
greencol_1 = hexc[Math.floor(newgreen/16)];
greencol_2 = hexc[newgreen%16];
bluecol_1 = hexc[Math.floor(newblue/16)];
bluecol_2 = hexc[newblue%16];
newcolor="#"+redcol_1+redcol_2+greencol_1+greencol_2+bluecol_1+bluecol_2
if (ie5 && gradient_effect!="none") {
if (gradient_effect=="horizontal") {gradient_effect=1}
if (gradient_effect=="vertical") {gradient_effect=0}
greencol_1 = hexc[Math.floor(newred/16)];
greencol_2 = hexc[newred%16];
bluecol_1 = hexc[Math.floor(newgreen/16)];
bluecol_2 = hexc[newgreen%16];
redcol_1 = hexc[Math.floor(newblue/16)];
redcol_2 = hexc[newblue%16];
var newcolorCompl="#"+redcol_1+redcol_2+greencol_1+greencol_2+bluecol_1+bluecol_2
document.body.style.filter=
"progid:DXImageTransform.Microsoft.Gradient(startColorstr="+newcolorCompl+", endColorstr="+newcolor+" GradientType="+gradient_effect+")"
}
else {
document.bgColor=newcolor
}
var timer=setTimeout("fadebg()",speed);
}
else {
clearTimeout(timer)
newred=oldred
newgreen=oldgreen
newblue=oldblue
oldcolor=newcolor
setrandomcolor()
}
}

if (browserok) {
window.onload=setrandomcolor
}
</script>

∆ Alert

Description
This method appends a name to a given path. A delimiter is added automatically. The following script will pop up the alert window below:

Script Code
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>

∆ Assign a Variable (from a text file)

Description
This method appends a name to a given path. A delimiter is added automatically. The following script will pop up the alert window below:

Script Code
<SCRIPT TYPE="text/javascript">
var txtFile = new XMLHttpRequest();
if(window.XMLHttpRequest) {
var req = new XMLHttpRequest();
try {
netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
} catch (e) {
//alert("Permission could be denied for cross-browser scripting.");
//manual support for Chrome Browser - until I can figure out something else
lines = "some default text goes here";
}
} else if(window.ActiveXObject) {
var req = new ActiveXObject("Microsoft.XMLHTTP");
}

txtFile.open("GET", "http://eddiejackson.net/data/dailybrief.txt", true);
txtFile.onreadystatechange = function() {
if (txtFile.readyState === 4) { // Makes sure the document is ready to parse.
if (txtFile.status === 200) { // Makes sure it's found the file.
allText = txtFile.responseText;

lines = "Text from your file will be placed here      " + txtFile.responseText; // Will separate each line into an array
}
}

}

txtFile.send(null);

</script>

∆ Background Color Changer

Script
<script language="JavaScript">

</script>

∆ Cycling Through List

Script Code
<script language="Javascript">

</script>

∆ Copy

Description
This method copies a source file to a destination file. If the destination file exists, it is overwritten only when overwriteFlag is true. On some systems, the destination file cannot be overwritten no matter what. Here is a script that copies test.txt from f:\ to f:\EddieJackson:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

var newpath = fso.CopyFile("f:\\test.txt", "f:\\EddieJackson\\test.txt");

-->

</SCRIPT>

∆ Copy Folder

Description
This method copies a source folder to a destination folder. If the destination folder exists, it is overwritten only when overwriteFlag is true. On some systems, the destination folder cannot be overwritten no matter what. Here is a script that copies temp from f:\ to f:\EddieJackson:

Script Code
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>

∆ Create Folder

Description
This method creates a folder called folderName. It returns the folder name. Here is a script that creates a folder new:

Script Code
<SCRIPT LANGUAGE="JavaScript">


</SCRIPT>

∆ Create File

Description
This method creates a text file called fileName. To overwrite an existing file, you need to include the optional parameter overwriteFlag and set it to true. If you don't include it, or if you set it to false, you will get the "File already exists" error message. This method returns the file object. Here is a script that creates a file new.txt, overwriting any existing file with the same name:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

var newFileObject = fso.CreateTextFile("d:\\new.txt", true);

-->

</SCRIPT>

∆ Delete File

Description
This method deletes a file called fileName. To delete a file with a read permission only, you need to include the optional parameter readPermissionFlag and set it to true. If you don't include it, or if you set it to false, you will get the "Permission denied" error message. Here is a script that deletes the file "new.txt", even if it has only read permission:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

fso.DeleteFile("d:\\new.txt", true);

-->

</SCRIPT>

∆ Delete Folder

Description
This method deletes a folder called folderName. To delete a folder with a read permission only, you need to include the optional parameter readPermissionFlag and set it to true. If you don't include it, or if you set it to false, you will get the "Permission denied" error message. On some systems, the optional parameter readPermissionFlag does not have any effect, and the folder is deleted no matter what. Here is a script that deletes the folder "new", only if it has a write permission:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

fso.DeleteFolder("d:\\new", false);

-->

</SCRIPT>

∆ Rename a File

Script Code
function ChangeFileName()
{
var fso, f;
fso = new ActiveXObject("Scripting.FileSystemObject");
f = fso.GetFile("FilePath/MyFile.txt");
f.name = "MyFile.htm";
}

∆ Check for Driver Letter

Description
This method checks whether a disk drive with the given letterDrive exists. It returns true if it exists, and false otherwise. Here is a script that checks if your PC has a "d" drive:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

hasDriveBool = fso.DriveExists("d");

-->

</SCRIPT>

∆ Check If File Exists

Description
This method checks whether a file fileName exists. It returns true if it exists, and false otherwise. Here is a script that checks if file old.txt exists:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

fileBool = fso.FileExists("d:\\old.txt");

-->

</SCRIPT>

∆ Check If Folder Exists

Description
This method checks whether a folder folderName exists. It returns true if it exists, and false otherwise. Here is a script that checks if folder old exists:

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

folderBool = fso.FolderExists("d:\\old");

-->

</SCRIPT>

∆ Return Only File Name

Description
This method returns a string containing the base name of pathName, without any extension or path. The use of this method is in applications that need to assemble file names on the basis of another file. For example, an application can name its output file using the base name of the executable (myapp.exe) and a different extenstion (myapp.out). The following script should pop up an alert box with the string myapp:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

baseName = fso.GetBaseName("f:\\EddieJackson\\js\\tips\\myapp.exe");

-->

</SCRIPT>

∆ Return File Extension

Description
This method returns the file extension name of the given path. You can use this method to determine file types, according to their extensions. The following script should pop up an alert box with the string "exe":

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

extName = fso.GetExtensionName("f:\\EddieJackson\\js\\tips\\myapp.exe");

alert(extName);

-->

</SCRIPT>

∆ Return File Name

Description
This method returns the file name of the given path. Use this method to assemble new file names on the basis of the given file. The following script should pop up an alert box with the string "myapp.exe":

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

fileName = fso.GetFileName("f:\\EddieJackson\\js\\tips\\myapp.exe");

alert(fileName);

-->

</SCRIPT>

∆ Return Parent Folder

This method returns the parent folder name of the given file or folder. A full path of the parent folder is returned. The following script should pop up an alert box with the string "f:\EddieJackson\js\tips":

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

folderName =

fso.GetParentFolderName("f:\\EddieJackson\\js\\tips\\myapp.exe");

alert(folderName);

-->

</SCRIPT>

∆ Return Special Folder

Description
This method returns one of three special folders: windows folder, system folder, or temporary folder, according to the given folderCode. The given folderCode is either 0 for a windows folder, 1 for a system folder, or 2 for a temporary folder. A full path is returned. On a typical installation, "c:\windows" is returned as the windows folder, "c:\windows\system" is returned as the system folder, and "c:\windows\temp" is returned as the temporary folder. The following script should pop up an alert box with the string "c:\windows":

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

winFolder = fso.GetSpecialFolder(0);

alert(winFolder);

-->

</SCRIPT>

∆ Create Unique Names

Description
This method returns a randomly-generated temporary file or folder. On a Windows installation, this file may start with "rad", followed by a random sequence of five alphanumeric characters. Use this method in applications where you need to create temporary files with unique names. The following script should pop up an alert box with a string that looks like "radEF98E.tmp":

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

tmpName = fso.GetTempName();

alert(tmpName);

-->

</SCRIPT>

∆ Move File

Description
This method moves a source file to a destination file. If the destination file exists, the file will not be moved and you'll get the "File already exists" error message. Here is a script that moves test.txt from d:\ to d:\EddieJackson:

MoveFile(source, destination)

Undefined

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

var newpath = fso.CopyFile("d:\\test.txt", "d:\\EddieJackson\\test.txt");

-->

</SCRIPT>

∆ Move Folder

Description
This method moves a source folder to a destination folder. If the destination folder exists, the folder will not be moved and you'll get the "File already exists" error message. Here is a script that moves new from d:\ to d:\EddieJackson:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

var newpath = fso.

File("d:\\new", "d:\\EddieJackson\\new");

-->

</SCRIPT>

∆ Open Text Stream

Description
This method opens a text stream object to the specified file, fileName, for reading and writing. The second parameter, iomode, indicates the mode of the file opening. Possible values are:

Constant	Value	Description
ForReading	1	Opens the file for reading
ForWriting	2	Opens the file for writing
ForAppending	8	Opens the file for appending

You need to set the constants yourself. JavaScript does not support them by itself. The third parameter, create, is a Boolean value indicating whether to create the file if does not exist (true) or to issue an error message if the file does not exist (false). The last parameter, format, is optional and indicates the file type. If not specified, the default file type is ASCII. The possible values of format are:

Constant	Value	Description
TristateUseDefault	-2	Opens the file using the system default
TristateTrue	-1	Opens the file as Unicode
TristateFalse	0	Opens the file as ASCII

You need to set these constants yourself. JavaScript does not set them by itself. Here is a script that opens the file f:\EddieJackson\js\tips\001122.html for writing as an ASCII. It creates the file if it does not already exist:

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var ForWriting = 2;

var TriStateFalse = 0;

var fso = new ActiveXObject("Scripting.FileSystemObject");

var newFile = fso.OpenTextFile("f:\\EddieJackson\\js\\tips\\001122.html", ForWriting, true, TriStateFalse);

-->

The file Object

∆ Return File Object

Description
This method returns the file object of the given file name. The following script should create a file object for f:\EddieJackson\js\tips\myapps.txt:

GetFile(pathName)

Object

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

fileObj = fso.GetFile("f:\\EddieJackson\\js\\tips\\myapp.txt");

-->

</SCRIPT>

Here are the file object's properties:

Property	Description
Attributes	Refers to the file attributes
DateCreated	Returns the file's creation date
DateLastAccessed	Returns the file's last-accessed date
DateLastModified	Returns the file's last-modified date
Drive	Returns the file's letter drive
Name	Returns the file name
ParentFolder	Returns the file's parent folder name
Path	Returns the file's long path
ShortPath	Returns the file's short path
Size	Returns the file size
Type	Returns the file type

Here are the file object's methods:

Method	Description
Copy()	Copies the file from one folder to another
Delete()	Removes the file
Move()	Moves the file from one folder to another
OpenAsTextStream()	Opens the file as a text stream

The Folder Object

∆ Return Folder Object

Description
This method returns the folder object of the given folder name. The following script should create a folder object for f:\EddieJackson\js\tips:

GetFolder(pathName)

Object

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

folderObj = fso.GetFolder("f:\\EddieJackson\\js\\tips");

-->

</SCRIPT>

Here are the folder object's properties:

Property	Description
Attributes	Refers to the folder attributes
DateCreated	Returns the folder's creation date
DateLastAccessed	Returns the folder's last-accessed date
DateLastModified	Returns the folder's last-modified date
Drive	Returns the folder's letter drive
Files	Returns the folder's files collection, containing all the file objects in the folder
IsRootFolder	Returns true if the folder is the root folder, false otherwise
Name	Returns the folder name
ParentFolder	Returns the folder's parent folder name
Path	Returns the folder's long path
ShortName	Returns the folder's short name
ShortPath	Returns the folder's short path
Size	Returns the folder size
SubFolder	Returns a folder's collection of all folders contained in the folder
Type	Returns the folder type

Here are the folder object's methods:

Method	Description
Copy()	Copies the folder from one folder to another
Delete()	Removes the folder
Move()	Moves the folder from one folder to another

The Drive Object

∆ Return Drive Object

Description
This method returns the drive object of the given drive name. The following script should create a drive object for f:

Drives

Collection

The drives collection holds a read-only collection of all available drives in the system. It has two properties:

Property	Description
Count	Returns the number of items in the collection
Item	Sets or returns an item from the collection that matches a specified key
DriveType	Returns the drive type

GetDrive(letterDrive)

Object

Script Code
<SCRIPT LANGUAGE="JavaScript">

<!--

var fso = new ActiveXObject("Scripting.FileSystemObject");

driveObj = fso.GetDrive("f");

-->

</SCRIPT>

The drive object does not have any methods. Here are the drive object's properties:

Property	Description
AvailableSpace	Returns the number of free bytes on the given drive
DriveLetter	Returns the drive letter of a physical local drive or a shared network
DriveType	Returns the drive type
FileSystem	Returns the file system type for the specified drive
FreeSpace	Returns the number of free bytes on the given drive
IsReady	Returns the status of the drive
Path	Returns the path of the given drive
RootFolder	Returns the folder object of the root folder
SerialNumber	Returns the unique serial number of the volume
ShareName	Returns the shared name of a network drive
TotalSize	Returns the total number of bytes on a specified drive
VolumeName	Sets or returns the volume name of the specified drive