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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"

"http://www.w3.org/TR/REC-html40/loose.dtd">

<HTML>

<HEAD>

<TITLE>A document with anchors with specific targets</TITLE>

</HEAD>

<BODY>

...beginning of the document...

<P>Now you may advance to

<A href="slide2.html" target="dynamic">slide 2.</A>

...more document...

<P>You're doing great. Now on to

<A href="slide3.html" target="dynamic">slide 3.</A>

</BODY>

</HTML>

Activating either link opens a new document in the frame named "dynamic" while the other frame,

"fixed", maintains its initial contents.

Note. A frameset definition never changes, but the contents of one of its frames can. Once the initial

contents of a frame change, the frameset definition no longer reflects the current state of its frames.

There is currently no way to encode the entire state of a frameset in a URI. Therefore, many user agents

do not allow users to assign a bookmark to a frameset.

Framesets may make navigation forward and backward through your user agent's history more difficult

for users.

16.3.1 Setting the default target for links

When many links in the same document designate the same target, it is possible to specify the target once

and dispense with the target attribute of each element. This is done by setting the target attribute of

the BASE element.

We return to the previous example, this time factorizing the target information by defining it in the BASE

element and removing it from the A elements.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"

"http://www.w3.org/TR/REC-html40/loose.dtd">

<HTML>

<HEAD>

<TITLE>A document with BASE with a specific target</TITLE>

</HEAD>

<BODY>

...beginning of the document...

<P>Now you may advance to <A href="slide2.html">slide 2.</A>

...more document...

<P>You're doing great. Now on to

<A href="slide3.html">slide 3.</A>

</BODY>

</HTML>

201

16.3.1 Setting the default target for links

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16.3.2 Target semantics

User agents should determine the target frame in which to load a linked resource according to the

following precedences (highest priority to lowest):

1. If an element has its target attribute set to a known frame, when the element is activated (i.e., a

link is followed or a form is processed), the resource designated by the element should be loaded into

the target frame.

2. If an element does not have the target attribute set but the BASE element does, the BASE

element's target attribute determines the frame.

3. If neither the element nor the BASE element refers to a target, the resource designated by the element

should be loaded into the frame containing the element.

4. If any target attribute refers to an unknown frame F, the user agent should create a new window

and frame, assign the name F to the frame, and load the resource designated by the element in the

new frame.

User agents may provide users with a mechanism to override the target attribute.

16.4 Alternate content

Authors should supply alternate content for those user agents that do not support frames or are configured

not to display frames.

16.4.1 The NOFRAMES element

<![ %HTML.Frameset; [

<!ENTITY % noframes.content "(BODY) -(NOFRAMES)">

]]>

<!ENTITY % noframes.content "(%flow;)*">

<!ELEMENT NOFRAMES - - %noframes.content;

-- alternate content container for non frame-based rendering -->

<!ATTLIST NOFRAMES

%attrs; -- %coreattrs, %i18n, %events --

The NOFRAMES element specifies content that should be displayed only when frames are not being

displayed. User agents that support frames must only display the contents of a NOFRAMES declaration

when configured not to display frames. User agents that do not support frames must display the contents

of NOFRAMES in any case.

NOFRAMES can be used in the FRAMESET section of a frameset document.

For example:

202

16.4 Alternate content

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"

"http://www.w3.org/TR/REC-html40">

<HTML>

<HEAD>

<TITLE>A frameset document with NOFRAMES</TITLE>

</HEAD>

non-frame based version of the document.</A>

</NOFRAMES>

</FRAMESET>

</HTML>

16.4.2 Long descriptions of frames

The longdesc attribute allows authors to make frame documents more accessible to people using

non-visual user agents. This attribute designates a resource that provides a long description of the frame.

Authors should note that long descriptions associated with frames are attached to the frame, not the

frame's contents. Since the contents may vary over time, the initial long description is likely to become

inappropriate for the frame's later contents. In particular, authors should not include an image as the sole

content of a frame.

The following frameset document describes two frames. The left frame contains a table of contents and

the right frame initially contains an image of an ostrich:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"

"http://www.w3.org/TR/REC-html40">

<HTML>

<HEAD>

<TITLE>A poorly-designed frameset document</TITLE>

</HEAD>

</FRAMESET>

</HTML>

Note that the image has been included in the frame independently of any HTML element, so the author

has no means of specifying alternate text other than via the longdesc attribute. If the contents of the

right frame change (e.g., the user selects a rattlesnake from the table of contents), users will have no

textual access to the frame's new content.

Thus, authors should not put an image directly in a frame. Instead, the image should be specified in a

separate HTML document, and therein annotated with the appropriate alternate text:

203

16.4.2 Long descriptions of frames

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"

"http://www.w3.org/TR/REC-html40">

<HTML>

<HEAD>

<TITLE>A well-designed frameset document</TITLE>

</HEAD>

</FRAMESET>

</HTML>

<HTML>

<HEAD>

<TITLE>The fast and powerful ostrich</TITLE>

</HEAD>

<P>

These ostriches sure taste good!

</OBJECT>

</HTML>

16.5 Inline frames: the IFRAME element

<!ELEMENT IFRAME - - (%flow;)* -- inline subwindow -->

<!ATTLIST IFRAME

%coreattrs; -- id, class, style, title --

longdesc %URI; #IMPLIED -- link to long description

(complements title) --

name CDATA #IMPLIED -- name of frame for targetting --

src %URI; #IMPLIED -- source of frame content --

frameborder (1|0) 1 -- request frame borders? --

marginwidth %Pixels; #IMPLIED -- margin widths in pixels --

marginheight %Pixels; #IMPLIED -- margin height in pixels --

scrolling (yes|no|auto) auto -- scrollbar or none --

align %IAlign; #IMPLIED -- vertical or horizontal alignment --

height %Length; #IMPLIED -- frame height --

width %Length; #IMPLIED -- frame width --

Attribute definitions

longdesc = uri [p.44] [CT] [p.43]

This attribute specifies a link to a long description of the frame. This description should supplement

the short description provided using the title attribute, and is particularly useful for non-visual

user agents.

name = cdata [p.44] [CI] [p.43]

This attribute assigns a name to the current frame. This name may be used as the target of subsequent

links.

width = length [p.46] [CN] [p.43]

The width of the inline frame.

204

16.5 Inline frames: the IFRAME element

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height = length [p.46] [CN] [p.43]

The height of the inline frame.

Attributes defined elsewhere

id, class (document-wide identifiers [p.65] )

title (element title [p.57] )

style (inline style information [p.174] )

name, src, frameborder, marginwidth, marginheight, scrolling (frame controls and

decoration [p.197] )

target (target frame information [p.200] )

align (alignment [p.183] )

The IFRAME element allows authors to insert a frame within a block of text. Inserting an inline frame

within a section of text is much like inserting an object via the OBJECT element: they both allow you to

insert an HTML document in the middle of another, they may both be aligned with surrounding text, etc.

The information to be inserted inline is designated by the src attribute of this element. The contents of

the IFRAME element, on the other hand, should only be displayed by user agents that do not support

frames or are configured not to display frames.

For user agents that support frames, the following example will place an inline frame surrounded by a

border in the middle of the text.

<IFRAME src="foo.html" width="400" height="500"

scrolling="auto" frameborder="1">

[Your user agent does not support frames or is currently configured

not to display frames. However, you may visit

<A href="foo.html">the related document.</A>]

</IFRAME>

Inline frames may not be resized (and thus, they do not take the noresize attribute).

Note. HTML documents may also be embedded in other HTML documents with the

OBJECT

element. See

the section on embedded documents [p.162] for details.

205

16.5 Inline frames: the IFRAME element

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206

16.5 Inline frames: the IFRAME element

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17 Forms

Contents

207

1. Introduction to forms

208

2. Controls

208

1. Control types

210

3. The FORM element

211

4. The INPUT element

213

1. Control types created with INPUT

214

2. Examples of forms containing INPUT controls

215

5. The BUTTON element

217

6. The SELECT, OPTGROUP, and OPTION elements

218

1. Preselected options

221

7. The TEXTAREA element

223

8. The ISINDEX element

223

9. Labels

224

1. The LABEL element

225

10. Adding structure to forms: the FIELDSET and LEGEND elements

227

11. Giving focus to an element

228

1. Tabbing navigation

229

2. Access keys

230

12. Disabled and read-only controls

230

1. Disabled controls

231

2. Read-only controls

231

13. Form submission

231

1. Form submission method

232

2. Successful controls

233

3. Processing form data

233

Step one: Identify the successful controls

233

Step two: Build a form data set

233

Step three: Encode the form data set

233

Step four: Submit the encoded form data set

234

4. Form content types

234

application/x-www-form-urlencoded

234

multipart/form-data

17.1 Introduction to forms

An HTML form is a section of a document containing normal content, markup, special elements called

controls [p.208] (checkboxes, radio buttons, menus, etc.), and labels on those controls. Users generally

"complete" a form by modifying its controls (entering text selecting menu items, etc.), before submitting

the form to an agent for processing (e.g., to a Web server, to a mail server, etc.)

207

17 Forms

Here's a simple form that includes labels, radio buttons, and push buttons (reset the form or submit it):

<P>

<LABEL for="firstname">First name: </LABEL>

<LABEL for="email">email: </LABEL>

<INPUT type="radio" name="sex" value="Female"> Female<BR>

</P>

</FORM>

Note. This specification includes more detailed information about forms in the subsections on form

display issues [p.322] .

17.2 Controls

Users interact with forms through named controls.

A control's "control name" is given by its name attribute. The scope of the name attribute for a control

within a FORM element is the FORM element.

Each control has both an initial value and a current value, both of which are character strings. Please

consult the definition of each control for information about initial values and possible constraints on

values imposed by the control. In general, a control's "initial value" may be specified with the control

element's value attribute. However, the initial value of a TEXTAREA element is given by its contents,

and the initial value of an OBJECT element in a form is determined by the object implementation (i.e., it

lies outside the scope of this specification).

The control's "current value" is first set to the initial value. Thereafter, the control's current value may be

modified through user interaction and scripts. [p.237]

A control's initial value does not change. Thus, when a form is reset, each control's current value is reset

to its initial value. If a control does not have an initial value, the effect of a form reset on that control is

undefined.

When a form is submitted for processing, some controls have their name paired with their current value

and these pairs are submitted [p.231] with the form. Those controls for which name/value pairs are

submitted are called successful controls [p.232] .

17.2.1 Control types

HTML defines the following control types:

208

17.2 Controls

buttons

Authors may create three types of buttons:

submit buttons: When activated, a submit button submits a form. [p.231] A form may contain

more than one submit button.

reset buttons: When activated, a reset button resets all controls to their initial values. [p.208]

push buttons: Push buttons have no default behavior. Each push button may have client-side

scripts [p.237] associated with the element's event [p.240] attributes. When an event occurs

(e.g., the user presses the button, releases it, etc.), the associated script is triggered.

Authors should specify the scripting language of a push button script through a default script

declaration [p.239] (with the META element).

Authors create buttons with the BUTTON element or the INPUT element. Please consult the

definitions of these elements for details about specifying different button types.

Note. Authors should note that the

BUTTON

element offers richer rendering capabilities than the

INPUT

element.

checkboxes

Checkboxes (and radio buttons) are on/off switches that may be toggled by the user. A switch is "on"

when the control element's selected attribute is set.

When a form is submitted, only "on" checkbox controls can become successful [p.232] . Several

checkboxes in a form may share the same control name. [p.208] Thus, for example, checkboxes

allow users to select several values for the same property. The INPUT element is used to create a

checkbox control.

radio buttons

Radio buttons are like checkboxes except that when several share the same control name [p.208] ,

they are mutually exclusive: when one is switched "on", all others with the same name are switched

"off". The INPUT element is used to create a radio button control.

menus

Menus offer users options from which to choose. The SELECT element creates a menu, in

combination with the OPTGROUP and OPTION elements.

text input

Authors may create two types of controls that allow users to input text. The INPUT element creates a

single-line input control and the TEXTAREA element creates a multi-line input control. In both cases,

the input text becomes the control's current value [p.208] .

file select

This control type allows the user to select files so that their contents may be submitted with a form.

The INPUT element is used to create a file select control.

hidden controls

Authors may create controls that are not rendered but whose values are submitted with a form.

Authors generally use this control type to store information between client/server exchanges that

would otherwise be lost due to the stateless nature of HTTP (see [RFC2068] [p.328] ). The INPUT

element is used to create a hidden control.

object controls

Authors may insert generic objects in forms such that associated values are submitted along with

other controls. Authors create object controls with the OBJECT element.

209

17.2.1 Control types

The elements used to create controls generally appear inside a FORM element, but may also appear outside

of a FORM element declaration when they are used to build user interfaces. This is discussed in the section

on intrinsic events. [p.240] Note that controls outside a form cannot be successful controls [p.232] .

17.3 The FORM element

<!ELEMENT FORM - - (%block;|SCRIPT)+ -(FORM) -- interactive form -->

<!ATTLIST FORM

%attrs; -- %coreattrs, %i18n, %events --

action %URI; #REQUIRED -- server-side form handler --

method (GET|POST) GET -- HTTP method used to submit the form--

enctype %ContentType; "application/x-www-form-urlencoded"

onsubmit %Script; #IMPLIED -- the form was submitted --

onreset %Script; #IMPLIED -- the form was reset --

accept-charset %Charsets; #IMPLIED -- list of supported charsets --

Start tag: required, End tag: required

Attribute definitions

action = uri [p.44] [CT] [p.43]

This attribute specifies a form processing agent. For example, the value might be a HTTP URI (to

submit the form to a program) or a mailto URI (to email the form).

method = get|post [CI] [p.43]

This attribute specifies which HTTP method will be used to submit the form data set [p.233] .

Possible (case-insensitive) values are "get" (the default) and "post". See the section on form

submission [p.231] for usage information.

enctype = content-type [p.46] [CI] [p.43]

This attribute specifies the content type [p.234] used to submit the form to the server (when the value

of method is "post"). The default value for this attribute is "application/x-www-form-urlencoded".

The value "multipart/form-data" should be used in combination with the INPUT element,

type="file".

accept-charset = charset list [p.47] [CI] [p.43]

This attribute specifies the list of character encodings [p.37] for input data that must be accepted by

the server processing this form. The value is a space- and/or comma-delimited list of charset [p.47]

values. The server must interpret this list as an exclusive-or list, i.e., the server must be able to accept

any single character encoding per entity received.

The default value for this attribute is the reserved string "UNKNOWN". User agents may interpret

this value as the character encoding that was used to transmit the document containing this FORM

element.

accept = content-type-list [p.46] [CI] [p.43]

This attribute specifies a comma-separated list of content types that a server processing this form will

handle correctly. User agents may use this information to filter out non-conforming files when

prompting a user to select files to be sent to the server (cf. the INPUT element when type="file").

210

17.3 The FORM element

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