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HTML Forms : Towards E-Comerce and Thin Client Server

From: Ross Nelson <Ross.Nelson@wizardis.com.au>
Date: Mon, 11 Jan 1999 11:44:44 +1100
Message-ID: <01BE3D57.C9381EE0@rossn.wizardis.com.au>
To: "'Frank Boumphrey'" <bckman@ix.netcom.com>
Cc: "'www-html@w3.org'" <www-html@w3.org>
After the encouraging words from Frank Boumphrey and some feedback from Braden Lake, I am posting the following Experimental RFC DRAFT which deals with a client server approach to HTML forms which I submited last October onto the list. It is attached below and can also be reached at (http://search.ietf.org/internet-drafts/draft-rfced-exp-nelson-00.txt).

 

Please read and post any feedback to list and myself. Any feedback given is appreciated and if anybody is interested in taking this area further  please let me know. I'd personally hope some general discussion about HTML Forms breaks out on this list sometime soon!

Cheers 
Ross Nelson
Senior Consultant 
Wizard Information Services
Team Leader , Business Entry Point Project Implementation




-----Original Message-----
From:	Frank Boumphrey [SMTP:bckman@ix.netcom.com]
Sent:	Sunday, 10 January 1999 11:23
To:	Ross nelson; www-html@w3.org
Subject:	Re: HTML Forms

HTML forms is something that the present HTML WG is looking at very closely,
indeed I am not giving anything away when I say that one of the directives
to the WG is to come up with a new set of forms suitable for e-commerce.

As this will probably be discussed in the near future by members of the WG,
now would be a great time for every one to put in their wish list for forms!

I f any one is interested, i can e-mail them privately my wish list for
forms.

Frank (Speaking for myself and not for the HTML WG)

Frank Boumphrey

XML and style sheet info at Http://www.hypermedic.com/style/index.htm
Author: - Professional Style Sheets for HTML and XML http://www.wrox.com
CoAuthor:  XML applications from Wrox Press, www.wrox.com
Author: Using XML on the Web (March)


----- Original Message -----
From: Ross nelson <Ross.Nelson@wizardis.com.au>
To: <www-html@w3.org>
Sent: Friday, January 08, 1999 3:10 PM
Subject: HTML Forms


Is anybody on this list interested in the progressing of HTML FORMS? Most
discussion here seems to be about XML as well as the presentation side of
HTML. Does anybody know of a list that deals with HTML FORM explicitily, or
is it just that people on this list arn't that interested in advancing this
area of HTML?

Responses please! :)

Ciao

Ross Nelson




INTERNET DRAFT		EXPIRES APR 1999		INTERNET DRAFT
                                                             R. Nelson
			                              12 October 1998
Category: EXPERIMENTAL


          	HTML REFRESH LANGUAGE (HTMLR/1.0)
		 <draft-rfced-exp-nelson-00.txt>
Status of This Memo

This document is an Internet-Draft.  Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its
areas, and its working groups.  Note that other groups may also
distribute working documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other
documents at any time.  It is inappropriate to use Internet-
Drafts as reference material or to cite them other than as
"work in progress."

To view the entire list of current Internet-Drafts, please check
the "1id-abstracts.txt" listing contained in the Internet-Drafts
Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net
(Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au
(Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu
(US West Coast).


Distribution of this document is unlimited.


Copyright Notice

   Copyright (C) Ross Nelson (1998).  All Rights Reserved.

Abstract

   This document describes HTML REFRESH, an EXPERIMENTAL language 
   and protocol for refreshing HTML pages and allowing serious 
   thin-client/server applications via HTTP [RFC2068].

1. Rationale and Scope

   HTML forms have changed little in functionality or feature since 
   the inception of the HTML standard. Whilst HTML forms allow the 
   submission of form data from visible and hidden fields up to a 
   server side CGI program (or some derivative thereof), the results 
   must come back as a complete HTML page, either in the existing 
   window/frame or in another browser window or frame.

   This is particularly tedious as the entire target page needs to 
   be redrawn, even if only certain data elements have been changed. 
   This has two very negative affects. Firstly, the bandwidth 
   requirements are increased as the entire page format must be sent 
   down to the browser again and not just the "field" data which has 
   changed. Secondly, the affect of redrawing the entire screen does 
   not allow the development of user friendly thin-client/server 
   applications (where the client is the web browser)and currently 
   leads to user disorientation.

   Various browser "add-ins", such as "Java" have been developed 
   whilst HTML forms have largely been allowed to languish. This is 
   extremely unfortunate as by far the largest number of transactions 
   over the Internet occur via HTML forms.

   This document specifies a HTML REFRESH language, which permits 
   the refreshing of the form data elements and images on a HTML 
   browser page without the redrawing of the entire page. This 
   allows serious user interfaces to be developed whilst using 
   less bandwidth to do so.

   Future versions of this protocol may include extensions for 
   refreshing non-form elements of a web page, in-line with DHTML 
   standards.

2. HTML REFRESH LANGUAGE
   The HTMLR language is built using the concepts of the HTML 
   language and is to be used in web browsers in conjuction 
   with HTML. Needless to say the main delivery method for 
   HTMLR is HTTP, with the use of a new mime-type.

2.1 HTTP Added mime-type
   The HTTP would allow the following mime-type through to the 
   browser and the web server and browser would comprehend it. 
   The mime-type is :

		text/htmlr

   which would denote the content which followed as a HTML refresh. 
   A HTML REFRESH aware browser would acknowledge the mime-type 
   and note not to redraw the target page from scratch but instead 
   integrate the results with it. 

2.2 HTMLR Language

   The HTMLR Language uses HTML like syntax to denote the refreshes 
   that are to be made to a HTML page. The following tags and 
   attributes are used to specify these refreshes. Each tag is 
   covered below with accompanying description and example.

   It is anticipated that HTMLR response pages would be generated by 
   existing CGI (or like) capable programming languages, for example 
   PERL, ASP, COLD FUSION, etc. Such languages should be easily 
   capable of generating HTMLR and also changing the response 
   mime-type.

2.3 HTMLR TAGS

2.3.1 HTMLR

   Syntax:
   <HTMLR> ... </HTMLR>

   Description:
   The HTMLR tag denotes that the all tags and text until the /HTMLR 
   tag comprise a refresh of the existing HTML page/frame as 
   displayed by the browser. This tag is equivalent in import to the 
   <HTML></HTML> tags. Upon encountering a HTMLR tag, a browser 
   should not clear the existing HTML display page/frame, but rather
   interpret the contents of the HTMLR tag and apply the relevant 
   processing to the current page.
 
   Valid tags within HTMLR tags are specified in the rest of this 
   section.

   Example:
   <HTMLR>
	..... refresh tags ....
   </HTMLR>

2.3.2 WITHFORM

   Syntax:
   <WITHFORM  NAME="form-name">....</WITHFORM>

   Description:
   The WITHFORM tag denotes which form the tags within it apply to. 
   The form-name specified with the NAME parameter must match the 
   name of an existing form on the currently displayed page. The 
   browser should treat all tags encountered within the WITHFORM 
   screen as dealing with the specified form where applicable.
   
   Tags which are affected by the WITHFORM tag are SETINPUT,
   SETTEXTAREA,CLEARINPUT,WITHSELECT.

   If  WITHFORM does not enclose these tags, they are deemed to be 
   relating to the first form on the current page.

   Example:
	<HTMLR>
		<WITHFORM NAME="Person">
		.... refresh tags for person form .....
		</WITHFORM>
	</HTMLR>


2.3.3 CLEARINPUT
   Syntax:
   <CLEARINPUT {EMPTY|DEFAULT}>

   Description:
   The CLEARINPUT tag clears all fields/checkboxes/radiobuttons/
   textareas/buttons in the currently targeted form and resets them 
   to either empty or their default values. The targeted form is the 
   one specified in the enclosing WITHFORM tag, or in the absence 
   of this, the first form on the page. This should be processed in 
   sequence by the browser, thus any subsequent SETINPUT tags would 
   set the fields away from their default or empty values.

   The EMPTY attribute sets the fields to empty whilst the DEFAULT 
   attribute set the fields to the original default value as 
   specified in the original HTML page.

   Example:
   <HTMLR>
	<WITHFORM NAME="PERSON">
		<CLEARINPUT EMPTY>
	</WITHFORM>
	<STATUS VALUE="Person Record Added">
   </HTMLR>


2.3.4 SETINPUT

   Syntax:
   <SETINPUT NAME="field-name" VALUE="new-value" {CHECKED|UNCHECKED} 
        {DISABLED|ENABLED}>

   Description:
   The SETINPUT tag sets the input-field to the new-value specified 
   in the VALUE parameter. For radio button and checkbox fields, the 
   CHECKED/UNCHECKED parameter can be specified to alter the field 
   appearance. The field-name, specified in the NAME parameter must 
   match the name of a field (hidden/text/radio/checkbox/button) in 
   the targeted form on the current page. The targeted form is the 
   one specified in the enclosing WITHFORM tag, or in the absence 
   of this, the first form on the page.  For radio button fields, 
   the new-value must also match the existing value of the named 
   field in the current form.

   The HTML 3.0 proposed (but not widely implemented) DISABLED 
   parameter could also be used in SETINPUT, along with ENABLED to 
   dynamically enable/disable the input field.

   Example:
   <HTMLR>
	<WITHFORM NAME="Person">
	<SETINPUT NAME="Name" VALUE="Fred Jones">
	<SETINPUT NAME="Dob" VALUE="26/Jan/1971">
	<SETINPUT NAME="Address" VALUE="35 Fred Street, Springfield">
	<SETINPUT NAME="Sex" Value="MALE" CHECKED>
	</WITHFORM>
   </HTMLR>

2.3.5	SETTEXTAREA
   Syntax:
   <SETTEXTAREA NAME="field-name" {ENABLED|DISABLED}
			>new-value</SETTEXTAREA>

   Description:
   The SETTEXTAREA tag sets the input-field to the new-value 
   specified before the closing /TEXTAREA tag. The field-name, 
   specified in the NAME parameter must match the name 
   of a textarea field in the targeted form on the current page. 
   The targeted form is the one specified in the enclosing WITHFORM 
   tag, or in the absence of this, the first form on the page.  

   The HTML 3.0 proposed (but not implemented) DISABLED parameter 
   could also be used in SETTEXTAREA, along with ENABLED to 
   dynamically enable/disable the textarea.

   Example:
   <HTMLR>
	<WITHFORM NAME="Person">
		<SETTEXTAREA NAME="Comments">
		The comments for this record are these
		</SETTEXTAREA>
	</WITHFORM>
   </HTMLR>

2.3.6	SETFOCUS
   Syntax:
   <SETFOCUS FORM="form-name" FIELD="field-name">

   Description:
   The SETFOCUS tag set the input focus the field/textarea/selectlist
   /checkbox/radiobutton-set/button with the name specified by the FIELD 
   parameter. The form the field is in is specified by the FORM 
   parameter. This tag is not affected by the WITHFORM tag as it 
   must set a definitive focus for the entire page, regardless of 
   how many forms are present.

   Example:
   <HTMLR>
	<MSGBOX>You must enter an Name</MSGBOX>
	<SETFOCUS FORM="Person" FIELD="Name">
   </HTMLR>

2.3.7	WITHSELECT
   Syntax:
   <WITHSELECT NAME="field-name"  {DESELECTALL} {REMOVEALL} 
		{ENABLED|DISABLED}></WITHSELECT>

   Description:
   The WITHSELECT tag is used to choose and set a select list 
   object in the current form. The field-name, specified in the 
   NAME parameter must match the name of a select list object  
   in the targeted form on the current page. The targeted form is 
   the one specified in the enclosing WITHFORM tag, or in the absence 
   of this, the first form on the page. 

   The DESELECTALL parameter immediately de-selects all existing 
   items in the select list. The REMOVEALL parameter immediately 
   removes all items from the select list.

   The HTML 3.0 proposed (but seldom implemented) DISABLED parameter 
   could also be used in WITHSELECT, along with ENABLED to 
   dynamically enable/disable the SELECT list.

   Example:

   <HTMLR>
   <WITHSELECT NAME="Continent" CLEARALL ENABLED>
	<SETOPTION SELECTED>Asia</A>
   </WITHSELECT>
   </HTMLR>

2.3.8	SETOPTION
   Syntax:
   <SETOPTION {ADD|DELETE} SELECTED|DESELECTED 
         VALUE="return-value">display-value</OPTION>

   Description:
   The SETOPTION tag is used to add, alter, or delete a select 
   list item of the current SELECT list object. The current select 
   list is the select list named by the last WITHSELECT within the 
   currently targeted form. The SETOPTION tag is invalid outside of a 
   WITHSELECT. The targeted form is the one specified in the 
   enclosing WITHFORM tag, or in the absence of this, the first form 
   on the page.  

   The ADD/DELETE parameter is used to add and delete items 
   respectively from the SELECT list. The SELECTED/DESELECTED 
   parameter is used to select/deselect an item after it has been 
   created, or if it already exists, to alter it.

   Example:
   See WITHSELECT tag example

2.3.9	MSGBOX
   Syntax:
   <MSGBOX {TITLE="title"}>message</MSGBOX>

   Description:
   The MSGBOX tag displays a centered message box to the user with 
   message supplied before the </MSGBOX> parameter enclosed in it. 
   The message box must be modal and have an 'OK' button to allow 
   the user to proceed. The browser should process the MSGBOX tag 
   immediately before parsing/processing any more of the HTMLREFRESH.
   The optional TITLE parameter specfies a title for the messagebox 
   window. 

   The text between MSGBOX and /MSGBOX tags should not contain HTML 
   formating and browsers may wrap the text as well as obey CRLF 
   combinations found in the text.

   The MSGBOX tag allows for easy server generated intrusive messages 
   without affecting the browser page display.

   Example:
   <HTMLR>
	<MSGBOX TITLE="Update Successful"
                >The Record has been updated.</MSGBOX>
   </HTMLR>

2.3.10	STATUS
   Syntax:
   <STATUS VALUE="status-line-value">

   Description:
   The STATUS tag is used to place the value specified in the VALUE 
   parameter into the status line at the bottom of the browser 
   window.

   The STATUS tag allows for another form of easy server generated 
   intrusive messages without affecting the browser page display.


   Example:
   <HTMLR>
	<STATUS VALUE="Please correct the value in the Age Field.">
	<BELL>
   </HTMLR>

2.3.11 PRINT and PRINTURL
   Syntax:
   <PRINT {TO=printer-name} {ORIENT=orientation} {TRAY=traynumber} 
	   {COPIES=copy-count}>....</PRINT>
   <PRINTURL {TO=printer-name} {ORIENT=orientation} 
         {TRAY=traynumber} {COPIES=copy-count} SRC="url">


   Description:
   The PRINT tag is used to print HTML to the specified printer. 
   The HTML to print is supplied between the PRINT and /PRINT tags. 
   The print is sent to the printer specified by the optional TO 
   parameter. If no TO parameter is specified, a printer dialog 
   should be displayed for the user to select a target printer 
   from. Printing should occur in parallel to any other browser 
   processing. The TO option is of most value in an intranet 
   environment.

   The ORIENT, TRAY and COPIES parameters are all options which 
   allow control over the printing process. The ORIENT parameter 
   can be used to specify "landscape" or "portrait" printing. The 
   TRAY parameter can be used to select a paper source. The COPIES 
   parameter can be user specify an number of copies to print. All 
   are optional and are most suited to intranet systems.

   The PRINTURL tag functions the same as the PRINT tag in terms of 
   parameters, except that the content to print is supplied by the 
   url specified in the SRC parameter. The browser should open the 
   specified url and print the resultant stream as requested. The
   printing method should be dictated by the mime-type returned.

   Browsers should aim to support multiple PRINT requests in a 
   single HTML REFRESH stream.

   The HTML allowable between the PRINT and /PRINT tags should be 
   of the same conformance level as the normal HTML supported by 
   the browser and print exactly the same as a user activated print 
   of a normal web page.

   Example:
   <HTMLR>
	<MSGBOX>The person record will now be printed to your 
              "HP" printer.</MSGBOX>
	<PRINT TO="hp01" ORIENT="portrait" TRAY="3" COPIES="1">
		<HTML>
			<HEAD>
				<TITLE>Person Record 123321</TITLE>
			</HEAD>
			<BODY>
				<H2>Person Record 123321</H2>
				<B>Name:</B> John Smith<BR>
				<B>DoB: </B>  14/Mar/1969<BR>
				<B>Address: </B> 14 James St Smithville<BR>
				<HR>
			</BODY>
		</HTML>
	</PRINT>
   </HTMLR>

2.3.12	BELL
   Syntax:
   <BELL>
   Description:
   The BELL tag makes the browser produce an audible or visible bell.

   Example:
   <HTMLR>
	<BELL>
	<MSGBOX>The server has detected an error.</MSGBOX>
   </HTMLR>

2.3.13	SETIMG
   Syntax:
   <SETIMG NAME="image-name" SRC="url">
   Description:
   The SETIMG tag is used to set images to new images based on a new 
   URL. The "image-name" given in the NAME parameter must match the 
   name of an image on the current HTML page. The new image is loaded 
   into the same screen area as specified by the original IMG tag on 
   the original HTML page.

   The browser will place the new image on the page in the same 
   location as the old image, with the same dimensions to avoid 
   page resizing.

   Example:
   <HTMLR>
	<SETIMG NAME="EmployeePic" SRC="/images/employee/002012.jpg">
   </HTMLR>


3. Operational Constraints and Implications

3.1 Web Servers
   Web servers may require configuration to allow the text/htmlr 
   mime-type to be transmitted from the CGI program.

3.2 Web Browsers
   Web browsers will naturally be required to support the protocol 
   with substantial internal changes. On reciept of a HTML REFRESH 
   of a given page, the page will not be redrawn but instead the 
   fields altered as required. The refresh should NOT be placed in
   any history or "BACK" button cache as this does not make sense.

3.3 Javascript/VBscript Implications
   Javascript/VBscript browser implementations could possibly be 
   extended to support an "OnRefresh" event in a similar manner 
   as the existing "OnLoad" event. This event would be triggered 
   upon receipt and application of a HTML REFRESH to the page. 
   Appropriate extensions to the HTML BODY tag syntax would need to 
   be made to support the "OnRefresh".

3.4	CGI Programs
   CGI program authors would gain the freedom to write serious 
   thin-client/server applications with HTML REFRESH. For example, 
   a HTML page could have buttons to move forward and backward
   though records in a database. Upon pressing either button, a 
   submission would be sent to the appropriate Web Server/CGI 
   program. It would navigate the the next/previous database row and
   return new data for the HTML form fields using a HTML REFRESH. 

   This refresh would only alter the values in the HTML FORM fields 
   on the page, thus lessening bandwidth requirents, aiding 
   usability and removing redundant page redraws.

3.5 Security
  HTML REFRESH pages would travel under HTTPS the same as HTML and 
   therefore enjoy the same security benefits.

4. Acknowledgements

   Thanks in particular to Steve Aldred, Nigel Williams and last but 
   not least Joanna Ladon for encouragement and review.

5. References

   [RFC2068] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., and T.
   Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2068,
   January 1997.


6. Author's Address

   Ross Nelson
   Wizard Information Services
   15 Barry Drive
   TURNER ACT 2612
   Australia

   EMail: Ross.Nelson@wizardis.com.au


INTERNET DRAFT		EXPIRES APR 1999		INTERNET DRAFT
Received on Sunday, 10 January 1999 19:48:42 GMT

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