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- In <9304061648.AA02068@www3.cern.ch> Tim says
-
- > There have been a lot of improvements proposed for HTML.
-
- > - Various forms of includion of graphics
- > - Tables
- > - Forms
-
- > I think we should get some concrete proposals for an HTML2 out
- > onto this list. This would bring us closer to a DTD for the
- > new thing, which would allow everyone to go out and
- > implement it.
-
- Glad to hear you say it!
-
- > The new format should of course be a superset of HTML. The first
- > thing it should include is indefinite nesting of constructs
- > which is not allowed in HTML.
-
- Some guidelines would be useful here, e.g. can you nest OL or UL in the
- DT glossary text in a DL list, or what about OL within UL within a DL list?
- What level of nesting should browsers aim to show effectively?
-
- For formal presentation as an elective Internet standard we should aim to
- be as precise as possible, e.g. via accurate DTD's and a range of examples.
- I there enclose a DTD fragment with my proposal for forms.
-
- > To kick off the discussion, I propose for the forms part the
- > following
-
- > FIELDS
- > ======
- > <FIELD NAME="f1" FIELDTYPE=TEXT MAXLEN=40> </FIELD>
-
- Tim, er did you receive my message with a detailed suggestion for forms?
-
- My practical experience with building hypertext/forms based interfaces
- for sales staff etc. has shown the value of:
-
- o to be able to freely embed fields in other
- textural or graphical backgrounds
-
- o the need for fields with constrained types
- e.g. dates, booleans, integer ranges, free text, ...
-
- o the need to initialise fields with default values
-
- o the ability to highlight fields as being in error
-
- o the ability to disable the field to prevent further change
-
- o the need for one-from-many AND many-from-many menus
-
- o giving authors control over the realisation of such menus
- e.g. radio buttons, drop down, and permanently visible lists
-
- Fields showing derived values, (e.g. a total figure in an expenses claim),
- and arbitrary constraints between different fields can be handled by the
- server. In this way you avoid can the need for a scripting language.
-
- If the user sets a field to an incorrect value, the ability to highlight
- the field makes it practical to draw the user's attention to that field
- with the implication that its value should be changed. An accompanying
- error message can be given as part of the surrounding text.
-
- Similarly, it is often the case that given certain settings of fields, that
- other fields cannot be changed. To make this obvious you should change the
- appearence of these fields. In my browser, I show fields with a darker colour
- when they accept input and the lighter window background colour when they are
- read-only. Clicking the mouse over a read-only field has no effect.
-
- As an author I want control over how a selection menu appears. When there are
- few choices, radio buttons or lists work well. When there are lots of
- selection fields it is strongly desirable to be able to use drop-down
- selections, which appear in the body of the form as a button and a box
- showing the currently selected value(s) for that field. Clicking on the
- button causes the list of possible choices to appear, with the current
- selection highlighted in some way.
-
- Essentially we need two tags, one for input fields and one for selections.
- These should be able to be placed freely with other HTML tags, so that you
- could embed fields in a preformatted text if you need tight control over
- the appearence. You could also put input and (dropdown) selection fields in
- glossary lists.
-
-
- Input Fields:
- ============
-
- These fields have the following attributes:
-
- o field name - used to identify the field's value to the server
-
- o field type - boolean, text, date, uri, integer, float
-
- o field width (optional) giving maximum length of field value
-
- o field status (optional) ok (the default), in error, read-only
-
- o initial value (optional)
-
-
- Selection Fields:
- ================
-
- These fields have the following attributes:
-
- o field name - used to identify the field's value to the server
-
- o field type - one-from-many or many-from-many
-
- o field appearence (optional) radio, list, drop-down
-
- o field status (optional) ok (the default), in error, read-only
-
- The field appearence is a hint to the browser of how the author intends the
- field to be displayed. For a drop-down field it would also be desirable to
- be able to suggest the maximum size for displaying current selections,
- particularly with many-from-many fields.
-
- The set of possible choices can be specified as Tim points out with the
- <LI> tag without the need for a new tag.
-
- Here is my suggested DTD for the <input> and <select> tags. I prefer
- these names as they seem more verb-like and appropriate than <field>
- and <radio>.
-
- <!-- INPUT tag
-
- o The field name and type are required.
-
- o The width, status and value attributes are optional.
-
- o Boolean fields have values "yes" or "no"
-
- o Date fields have values matching:
-
- "19th January 1992"
- "19 Jan 92"
- "19 Jan 92"
- "19/1/92" with '/' or '-' as separators
- "1/19/92"
-
- o URL fields have values corresponding to existing standards
- for universal resource locators
-
- o values should be enclosed on "quotes"
-