Page 65 - DCAP408_WEB_PROGRAMMING

Unit 2: Creating Static Web Pages

Scripts can examine and set properties of fields. They can also examine a small set of standard Notes
properties of the user agent, for instance the user’s name, the time of day, the type of user agent,
and so on.
Scripts can’t do anything that might jeopardize the user or the host machine. Scripts can’t send
messages over the network, or read or write files. The library calls that are allowed are restricted
to a very small and well defined set. These precautions are necessary for untrusted scripts.

Task It is envisaged that script interpreters will offer a much wider application
programming interface to trusted scripts, as determined on the basis of a digital signature
by a trusted third party. Analyze in group of four.

Permitted Attributes for Form

 ACTION
The ACTION attribute is a URL specifying the location to which the contents of the form
is submitted to elicit a response. If the ACTION is missing, the URL for the document itself
is assumed. The way data is submitted varies with the access protocol of the URL, and with
the values of the METHOD and ENCTYPE attributes.
 METHOD
This specifies variations in the protocol used to send the form contents. It is currently
restricted to GET (the default) or POST. The attribute was introduced to inform user agents
which HTTP methods the server supports.
 ENCTYPE

This attribute specifies the MIME content type to be used to encode the form contents.
It defaults to the string: “application/x-www-form-urlencoded”
 SCRIPT

This can be used to give a URI for a script. The scripting language and the interface with the
user agent is not part of the HTML 3.0 specification.

Self Assessment

Fill in the blanks:
13. If you do not specify a border attribute the table will be displayed without
any………………...
14. Scripts can examine and set properties of………………..

2.8 Frames

Frames divide a browser window into two or more document windows, each displaying a
different document, or a different part of the same document. Frames in an HTML document can
cause a web page to appear to be divided into multiple, scrollable regions. For each frame, you
can assign a name, a source document locator, dimensions, border alignment and decorations,
scroll and resize behaviors, loading and unloading behavior, file and topic maps, and style
sheets.

LOVELY PROFESSIONAL UNIVERSITY 59