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Mosaic for X version 2.0
―盢 soft language , 痀疭
NOTE : when writing web HTML DOCUMENT.
Actually,
( is ,
) is
~~~~~
(FORM ACTION="url") ... (/FORM)
NOTE :
Actually, ( is , ) is when writing web.
The attributes are as follows:
ACTION is
the URL of the query server
to which the form contents will be submitted;
if this attribute is absent,
then the current document URL will be used.
METHOD is the
HTTP/1.0 method used
to submit the fill-out form to a query server.
Which method you use depends on
how your particular server works;
we strongly recommend use of
(or near-term migration to) POST.
The valid choices are:
GET -- this is the default method and causes
the fill-out form contents to be appended to the URL
as if they were a normal query.
POST -- this method causes the fill-out form contents
to be sent to the server in a data body
rather than as part of the URL.
ENCTYPE specifies the encoding for the fill-out form contents.
This attribute only applies
if METHOD is set to POST
-- and even then, there is only one possible value
(the default, application/x-www-form-urlencoded) so far.
NOTE:
If you want to use the METHOD of type POST with
Inside a FORM you can have anything except another FORM.
Specifically, INPUT, SELECT, and TEXTAREA tags are used
to specify interface elements within the form.
Forms are not automatically visually differentiated from
the rest of a document.
We recommend using the HR (horizontal rule)
tag before and after
a form to cleanly differentiate it
from surrounding text and/or other forms.
The INPUT tag is used to specify a simple input element inside a FORM.
It is a ;
it does not surround anything and there is no terminating tag
-- i.e., it is used in much the same way as IMG.
In Mosaic for X, various types of INPUT tags
are instantiated as Motif widgets
(text entry fields, toggle buttons, pushbuttons,
etc.).
The attributes to INPUT are as follows:
TYPE must be one of:
"text" (text entry field; this is the default)
"password" (text entry field; entered characters are represented as asterisks)
"checkbox" (a single toggle button; on or off)
"radio" (a single toggle button; on or off; other toggles with the same NAME are grouped into "one of many" behavior)
"submit" (a pushbutton that causes the current form to be packaged up into a query URL and sent to a remote server)
"reset" (a pushbutton that causes the various input elements in the form to be reset to their default values)
NAME is the symbolic name (not a displayed name
-- normal HTML within the form is used for that)
for this input field.
This must be present for all types but "submit" and "reset",
as it is used when putting together the query string that
gets sent to the remote server
when the filled-out form is submitted.
VALUE, for a text or password entry field,
can be used to specify the default contents of the field.
For a checkbox or a
radio button,
VALUE specifies the value of the button when it is checked
(unchecked checkboxes are disregarded when
submitting queries);
the default value for a checkbox or radio button is "on".
For types "submit" and "reset", VALUE can
be used
to specify the label for the pushbutton.
CHECKED (no value needed) specifies that this checkbox or radio button is checked by default; this is only appropriate for checkboxes and radio buttons.
SIZE is the physical size of the input field in characters;
this is only appropriate for text entry fields
and password entry fields.
If this is not present, the default is 20.
Multiline text entry fields can be specified as
SIZE=width,height;
e.g. SIZE=60,12.
If (INPUT SIZE=)
NOTE :
Actually, ( is , ) is when writing web.
Note:
the SIZE attribute should not be used
to specify multiline text entry fields
now that the TEXTAREA tag is available.
MAXLENGTH is the maximum number of
characters that are accepted as input;
this is only appropriate for text entry
fields and password entry fields
(and only for single-line text entry fields at that).
If this is not present,
the default will be unlimited.
The text entry field is assumed to scroll appropriately
if MAXLENGTH is greater than SIZE.
EXAMPLES:
(FORM ACTION="/mn/10key/FORM.html")
Name
(INPUT)
(/INPUT)
(/FORM)
and
(FORM ACTION="/mn/10key/FORM.html")
Password
(INPUT VALUE=********)
(/INPUT)
(/FORM)
and
(FORM ACTION="/mn/10key/FORM.html")
Checkbox or Submit, Reset button
[showing BUTTON function only]
(a href="/mn/10key")(img src=/images/ballsq/l_red.gif)
(/a)
(/FORM)
―盢 soft language , 痀疭
NOTE : when writing web HTML DOCUMENT.
Actually,
( is ,
) is
~~~~~
NOTE :
Actually, ( is , ) is when writing web.
any number of SELECT tags are allowed,
freely intermixed with other HTML elements
(including INPUT and TEXTAREA elements)
and text (but not additional forms).
In Mosaic for X, SELECT tags are instantiated
as Motif option menus and scrolled lists.
Unlike INPUT, SELECT has both opening and closing tags.
Inside SELECT, only a sequence of OPTION tags
-- each followed by an arbitrary amount of plain text (no HTML markup) --
is allowed;
for example:
(SELECT NAME="a-menu")
(OPTION) First option.
(OPTION) Second option.
(OPTION) .....
(/SELECT)
NOTE :
Actually, ( is , ) is when writing web.
The attributes to SELECT are as follows:
NAME is the symbolic name for this SELECT element.
This must be present,
as it is used when putting together the
query string
for the submitted form.
SIZE:
if SIZE is 1 or if the SIZE attribute is missing,
by default the SELECT will be represented as
a Motif option menu.
If SIZE is 2 or more, the SELECT will be represented as
a Motif scrolled list;
the value of SIZE then determines how
many items will be visible.
MULTIPLE, if present (no value),
specifies that the SELECT should allow multiple selections
(n of many behavior).
The presence of MULTIPLE forces the SELECT to be represented
as a Motif scrolled list,
regardless of the value of SIZE.
The attributes to OPTION are as follows:
SELECTED specifies that this option is selected by default.
If the SELECT allows multiple selections
(via the MULTIPLE attribute),
multiple options can be specified as SELECTED.
NAME is the symbolic name of the text entry field.
ROWS is the number of rows (vertical height in characters) of the text entry field.
COLS is the number of columns (horizontal width in characters) of the text entry field.
TEXTAREA fields automatically have scrollbars;
any amount of text can be entered in them.
The TEXTAREA element requires both an opening and a closing tag.
A TEXTAREA with no default contents looks like this:
(TEXTAREA NAME="foo" ROWS=4 COLS=40)
(!TEXTAREA)
A TEXTAREA with default contents looks like this:
(TEXTAREA NAME="foo" ROWS=14 COLS=50)
Default contents go here.
(!TEXTAREA)
NOTE :
Actually, ( is , ) is when writing web.
NOTE :
Actually, ( is , ) is when writing web.
The default contents must be straight ASCII text.
Newlines are respected
(so in the above example there will be a newline both
before and after "Default contents go here.").
When the submit button is pressed,
the contents of the form will be assembled
into a query URL that looks like this:
action?name=value&name=value&name=value
("action" here is the URL specified by
the ACTION attribute to the FORM tag,
or the current document URL
if no ACTION attribute was specified.)
Strange characters in any of the "name"
or "value" instances will be escaped as usual;
this includes "=" and "&".
Note:
This means that instances of "=" that separate names and values,
and instances of "&" that separate name/value pairs,
are not escaped.
For text and password entry fields,
whatever the user typed in will be the value;
if the user didn't type anything,
the value will be empty but the "name=" part of the query string
will still be present.
For checkboxes and radio buttons,
the VALUE attribute specifies the value of a checkbox
or radio button when it is checked.
An unchecked checkbox is disregarded completely
when assembling the query string.
Multiple checkboxes can have the same
NAME
(and different VALUEs), if desired.
Multiple radio buttons intended
to have "one of many" behavior should have
the same NAME and different VALUEs.
For Method = POST
The contents of the form are encoded exactly
as with the GET method (above),
but rather than appending them
to the URL specified by the form's ACTION attribute as a query,
the contents are sent in a data block
as part of the POST operation.
The ACTION attribute (if any) is the URL
to which the data block is POSTed.
For METHOD="POST", use ACTION="http://hoohoo.ncsa.uiuc.edu/cgi-bin/post-query"
For METHOD="GET", use ACTION="http://hoohoo.ncsa.uiuc.edu/cgi-bin/query"
C source code for the query and post-query programs
is distributed with NCSA HTTPd,
in the cgi-src directory.
The fill-out form examples listed below
use these query servers as their back ends,
so you can see them in action
and know what to expect with your own forms.
Important note:
If you use the GET method in your form,
you will notice that the example GET server will choke
if too much data (more than a couple hundred bytes)
is submitted at a time
-- the server is passing the data to
the form-processing module via a shell command line,
and the maximum shell command line length is being exceeded.
This problem does not exist with the POST method and server.
A "submit" element is necessary in all forms
except those containing only
a single INPUT element of type TEXT
(in which case Return in the text entry area submits the form)
or at least one INPUT element of type IMAGE
(in which case a click in the image submits the form).
Mosaic has a stealth feature: if a single text field is
in a form and the NAME of the text field is "isindex",
then the submitted query will be just like
you are used to getting with ISINDEX -- "url?querystring"
(i.e., not "url?isindex=querystring").
This allows you to use simple fill-out forms in your documents
to point to existing query servers
(including Gopher and WAIS servers!).
This of course assumes
that the POST method is not specified for such forms.
There seems to be a bug under IRIX 5.1.0.1 and 5.1.1 (at least)
that causes text entry fields in forms
to only be half as (physically) big as they should be.
This is not a bug in Mosaic
-- the fields are the correct size on all other X servers
we have seen,
and this general geometry problem afflicts other programs running
under IRIX 5.1.0.1/5.1.1 also
(e.g. Marc's Epoch windows come up
half as big as they should, etc.).
There's nothing we can do until SGI fixes the bug
in their X server.
Examples:
Twelve examples are available.
All of the examples now use METHOD=POST.
We strongly, strongly recommend use of
the POST method with fill-out forms.
One reason:
with the GET method,
given the way many servers (e.g. NCSA HTTPd) pass query strings
from URLs to query server scripts,
you run an excellent chance of having the forms contents truncated
by hardcoded shell command argument lengths.
With POST (again, e.g., with NCSA HTTPd)
you should be able to do a total end run around such problems.
For details, please see in:
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