Contents
Introduction
Properties
Methods
Events
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Introduction
- A Document object is described as what lies between the <HEAD>
and <BODY> tags
- Various components which make up a document are accessible as
properties (anchor, form and link
arrays).
The document object has many properties, and a few powerful methods.
Like the window
object, is a very important object (worth getting to know).
A document object has the following properties:
A document object has the following methods:
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Properties
The document object has the following properties, some of which
are themselves objects.
- alinkColor: specifies the color
of a link as it is active (between the mouse button being pressed,
then released). This document's active link colo(u)r is:
.
The code to print the abover is as follows:
<SCRIPT LANGUAGE="JavaScript"> document.write(document.alinkColor)
</SCRIPT>
- anchors: an array
which lists all the anchors in a document.
- bgColor: the document's background
colo(u)r. This document's background colo(u)r is:
.
The code to print the abover is as follows:
<SCRIPT LANGUAGE="JavaScript"> document.write(document.bgColor)
</SCRIPT>
- cookie: this one's got a lot to
say for itself, and it don't look like a digestive to me.
- fgColor: The foreground colo(u)r
of the document (or text colo(u)r). This document's foreground
colo(u)r is:
.
The code to print the above is as follows:
<SCRIPT LANGUAGE="JavaScript"> document.write(document.fgColor)
</SCRIPT>
- forms: an array
with all the forms in a document.
- lastModified: the date the
document was last modifed, this one was last modified on
The code to print the above is as follows:
<SCRIPT LANGUAGE="JavaScript"> document.write(document.lastModified)
</SCRIPT>
- linkColor: the color of a link.
This document's link color is
- links: an array
object of all the links in a document
- location: is the complete URL
of the document. This document's location is
- referer: is the URL of the
calling document. This document's referer is
- title: the document's title. This
document's title is
- vlinkColor: the color of a previously
viewed link. For this document it is
- anchor: an achor object. I am
not sure why this is said to be a property of the document, since
there is the anchors array to get at all
the anchors in a document.
- form: again I am not sure why
this is listed as a property of the document, the forms
array is used to get at all the forms in a document.
- history: the history object can
be used to navigate back or forwards through the user's previous
URL's
- link: this is also listed as a property
of the document. The links array is used
to get at all the links in a document.
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Methods
There aren't many methods to a document, but some are very useful.
For example the write and writeln are used extensively in this tutorial
to display example text.
(enlightening no?)
The code to produce the above is as follows:
- Define three functions, and one variable, all enclosed
in <SCRIPT> / </SCRIPT> tags:
<SCRIPT>
var wWindow
function ClearWindow() {
wWindow.document.clear()
wWindow.document.write("<TITLE> New Heading</TITLE>",
"<BODY> <H1 ALIGN=CENTER>New Heading!</H1>",
"Some new demonstration text.</P></BODY>")
}
function OpenWindow()
{
wWindow = window.open("JAVDEMO.HTM", "WindowName",
"height=150,width=250,height=200,resizable=1")
}
function CloseWindow()
{
}
</SCRIPT>
- Inside form tags, define buttons, assigning functions to
each one:
close: closes a stream opened with
document.open(). The close method stops the browser from trying
to get the rest of the document, causing the "document done"
status to be displayed in the browser's status bar.
open: opens a stream to collect the
output of write or writeln methods (see next methods). This method
has an optional parameter which specifies the mime type.
The default is "text/html".
Syntax: document.open( [ "mimeType" ]
), where the optional mimeType can be one of:
- text/html
- text/plain
- image/gif
- image/jpeg
- image/x-bitmap
- plugIn
where plugIn is a two-part (presumably that means a mime
type which is of the format name1 / name2 ?) MIME type Netscape
supports.
A typical use of this method is as follows:
- open a window object
- open a document object within that window
- write and / or writeln to the document
- close the document
- optionally open the document again to begin output again
- finally close the window
write: writes HTML expresssions to
a document object. Useful for putting last
modified dates in documents, or for generating full HTML documents
(see clear method example).
Syntax: write( expression [ , expression ... ] )
writeln: as for write, but appends
a newline character after the command is executed (that means
after all the expressions within one write statement have been
carried out). Normally HTML ignores newlines, but it can be useful
in <PRE> tags, or for script generation.
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Event Handlers
There are no event handlers for the document object. See the Window
Object's onLoad
and onUnload
event handlers for the nearest thing.
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