字段组

类别: 选择
令牌: comp.field-group
层级: 基础
用于: Checkbox group, Radio group

概览

Web: tanrei-field-group; schedule
SwiftUI: TanreiFieldGroup; radio_button_unchecked
Jetpack Compose: TanreiFieldGroup; radio_button_unchecked
Flutter: TanreiFieldGroup; radio_button_unchecked
React Native: FieldGroup; radio_button_unchecked

生成自 docs/status/status.json, specs/field-group.spec.json

一组复选框，带有名称、描述和必填标记

有些问题要用几个控件来回答：选其中哪几项、这几项设置、分成五个字段的地址。字段组给这一组控件一个名称、一行说明该怎么回答的文字、一个说明是否必须回答的词，以及回答被拒绝时的一条原因。它是一个以一组控件为控件的字段。

字段组框住这一组控件并为它们布局。它不选择任何东西，不保存值，不移动焦点，也不处理任何按键：这些都由每个控件自己负责。

在 Web 上它是 <tanrei-field-group>。其他平台尚未实现。

用法

<tanrei-field-group label="通知方式" supporting-text="可多选。" required required-text="必填"
                    error error-text="请至少选择一种通知方式。">
  <tanrei-checkbox name="notify" value="email" label="邮件"></tanrei-checkbox>
  <tanrei-checkbox name="notify" value="text" label="短信"></tanrei-checkbox>
  <tanrei-checkbox name="notify" value="push" label="推送通知"></tanrei-checkbox>
</tanrei-field-group>

<!-- 相互关联的字段。 -->
<tanrei-field-group label="收货地址" spacing="fields">
  <tanrei-text-field label="街道地址" required required-text="必填"></tanrei-text-field>
  <tanrei-text-field label="城市" required required-text="必填"></tanrei-text-field>
</tanrei-field-group>

<script type="module">
  import '@tanrei/web/components/field-group';
</script>

import { Checkbox, FieldGroup } from '@tanrei/react';

<FieldGroup label="通知方式" supportingText="可多选。" error={none} errorText="请至少选择一种通知方式。">
  <Checkbox label="邮件" checked={email} onChange={(event) => setEmail(event.detail.checked)} />
  <Checkbox label="短信" checked={text} onChange={(event) => setText(event.detail.checked)} />
</FieldGroup>

规格

针对整组的错误、排成一行、开关，以及相互关联的字段

构成

部件	说明
1 `label`	Names the set (a legend on the web): above the controls, from the start edge, in the style of a field's label, and never cut. The requirement mark follows it.
2 `requirement-label` · 可选	After the label: the Tag component at its small size, drawn as every small tag is and never a control, saying the set is required or optional; or, for required, an asterisk after the label.
3 `supporting-text` · 可选	The description: a line under the label, before the controls, that says how to answer. It stays while the group is in error.
4 `controls`	The controls of the set, in the order given, in a column or in a row that wraps: checkboxes or switches, each with its own label beside it, the radio buttons of one group while kind is radio-group, or fields (a radio group or a checkbox group among them is one member, as a field is). Each keeps its own tokens, states, keyboard, events and value.
5 `error-text` · 可选	The reason the set as a whole was refused, below the last control, where a field's error text is.

属性

属性	类型	默认值	说明
`label`	`string`	`""`	Names the set, visibly and to assistive technology: the question its controls answer ("Notify me by"). Required.
`labelHidden`	`boolean`	`false`	Does not draw the label, which stays the accessible name of the group. For a set whose visible heading is elsewhere.
`supportingText`	`string`	`""`	The description: how to answer ("Choose all that apply"), drawn under the label and given to assistive technology as the group's description.
`errorText`	`string`	`""`	What is wrong with the set as a whole and how to put it right ("Choose at least one"), drawn below the controls while error is true.
`error`	`boolean`	`false`	Puts the set in the error condition: the error text is drawn, and each selection control that has an error condition of its own (a checkbox, a radio button) is drawn in it. What an answer means is the product's to validate; the group never sets this itself. One control of a valid group may still be in error by itself.
`disabled`	`boolean`	`false`	Disables every control of the set and draws the frame as disabled.
`required`	`boolean`	`false`	What the form asks of the set: true exposes it as required and draws the required mark beside the label. It never validates: a missing answer is the product's to report with error.
`optional`	`boolean`	`false`	Draws the optional tag after the label and adds optionalText to the group's description, because assistive technology has no state for it. Ignored while required is true: a set is never both.
`requiredMark`	`auto` \| `tag` \| `asterisk` \| `none`	`"auto"`	How this set shows that it is required: tag is a small filled Tag with requiredText, asterisk is "*" after the label, none draws nothing and keeps the semantics. Auto takes comp.field-group.requirement.mark, which follows sys.behavior.requirement-mark, the system's one answer. Ignored unless required is true.
`requiredText`	`string`	`""`	The text of the required tag, in the product's language ("Required", "必須"). The product's: Tanrei has no word for it. Empty reads the product's words; with neither, FGR-24 says what is drawn.
`optionalText`	`string`	`""`	The text of the optional tag, in the product's language ("Optional", "任意"); also read to assistive technology as part of the description. The product's: Tanrei has no word for it. Empty reads the product's words.
`orientation`	`vertical` \| `horizontal`	`"vertical"`	vertical stacks the controls in one column, the default and the form to prefer: every label starts on one edge and is read down. horizontal lays them out in a row that wraps, for two or three short options or a row of fields.
`spacing`	`controls` \| `fields`	`"controls"`	What the set holds, which decides the distance between its members. controls: checkboxes or switches, a touch target apart. fields: text fields and other fields that belong together (an address, a date in parts), the distance a form keeps between two fields. A design system may add values.
`kind`	`group` \| `radio-group`	`"group"`	What the set is to assistive technology. group: a named group of controls that each answer for themselves. radio-group: the radio group of the radio buttons it holds, which is required and invalid as a whole and says its orientation. It changes what is exposed and nothing that is drawn, and the field group still holds no value: the radio buttons keep their selection, their arrow keys and their tab stop, which their own group gives them — the Radio group they stand in, or their name. The Radio group sets it; a product sets it where it writes that set by hand.

条目

该组件重复排列的条目种类。测试样例按顺序列出条目；各平台以各自的惯用方式为每个种类命名。

`checkbox`

A Checkbox of the set: the checkbox component with its own label, placed and spaced by the group, put in its error condition and disabled with the group, otherwise drawn and behaving as it does anywhere.

属性	类型	默认值	说明
`checked`	`boolean`	`false`	Whether it is on, as the Checkbox's checked.
`label`	`string`	`""`	Its own label, as the Checkbox's label.
`disabled`	`boolean`	`false`	As the Checkbox's disabled: one control of an enabled group may be disabled by itself.
`indeterminate`	`boolean`	`false`	As the Checkbox's indeterminate: a parent checkbox written by hand over a set that is partly checked.

规格	Web	SwiftUI	Jetpack Compose	Flutter	React Native
条目	`tanrei-checkbox`	`TanreiCheckbox`	`TanreiCheckbox`	`TanreiCheckbox`	`Checkbox`
`checked` · 属性	`checked`	`isOn`	`checked`	`value`	`value`
`label` · 属性	`label`	`title`	`label`	`label`	`label`
`disabled` · 属性	`disabled`	`disabled`	`enabled`	`onChanged`	`disabled`
`indeterminate` · 属性	`indeterminate`	`isIndeterminate`	`state`	`tristate`	`indeterminate`

`switch`

A Switch of the set: the switch component with its own label, placed, spaced and disabled by the group.

属性	类型	默认值	说明
`checked`	`boolean`	`false`	Whether it is on, as the Switch's checked.
`label`	`string`	`""`	Its own label, as the Switch's label.
`disabled`	`boolean`	`false`	As the Switch's disabled.

规格	Web	SwiftUI	Jetpack Compose	Flutter	React Native
条目	`tanrei-switch`	`TanreiSwitch`	`TanreiSwitch`	`TanreiSwitch`	`Switch`
`checked` · 属性	`checked`	`isOn`	`checked`	`value`	`value`
`label` · 属性	`label`	`title`	`label`	`label`	`label`
`disabled` · 属性	`disabled`	`disabled`	`enabled`	`onChanged`	`disabled`

`text-field`

A Text field of the set, with its own label, help and error: the group places it, spaces it as a field and disables it, and leaves its error to it.

属性	类型	默认值	说明
`label`	`string`	`""`	Its own label, as the Text field's label.
`value`	`string`	`""`	Its value, as the Text field's value.
`supportingText`	`string`	`""`	Its own help, as the Text field's supportingText.
`required`	`boolean`	`false`	As the Text field's required.
`optional`	`boolean`	`false`	As the Text field's optional.
`requiredText`	`string`	`""`	The Text field's requiredText: the words of its requirement tag, the product's.
`optionalText`	`string`	`""`	The Text field's optionalText: the words of its requirement tag, the product's.

规格	Web	SwiftUI	Jetpack Compose	Flutter	React Native
条目	`tanrei-text-field`	`TanreiTextField`	`TanreiTextField`	`TanreiTextField`	`TextField`
`label` · 属性	`label`	`label`	`label`	`labelText`	`label`
`value` · 属性	`value`	`text`	`value`	`controller`	`value`
`supportingText` · 属性	`supportingText`	`supportingText`	`supportingText`	`helperText`	`supportingText`
`required` · 属性	`required`	`isRequired`	`required`	`required`	`required`
`optional` · 属性	`optional`	`isOptional`	`optional`	`optional`	`optional`
`requiredText` · 属性	`requiredText`	`requiredText`	`requiredText`	`requiredText`	`requiredText`
`optionalText` · 属性	`optionalText`	`optionalText`	`optionalText`	`optionalText`	`optionalText`

`radio-button`

A Radio button of the set, while kind is radio-group: the radio button component with its own label, placed, spaced and disabled by the group. Its selection, its arrow keys, its tab stop and its position stay its own group's — the Radio group it stands in, or its name.

属性	类型	默认值	说明
`checked`	`boolean`	`false`	Whether it is the chosen one, as the Radio button's checked.
`value`	`string`	`""`	What it stands for, as the Radio button's value.
`name`	`string`	`""`	The group it belongs to, as the Radio button's name. Every radio button of one field group carries one name; inside a Radio group it carries none.
`label`	`string`	`""`	Its own label, as the Radio button's label.
`disabled`	`boolean`	`false`	As the Radio button's disabled: one option of an enabled group may be disabled by itself.

规格	Web	SwiftUI	Jetpack Compose	Flutter	React Native
条目	`tanrei-radio-button`	`TanreiRadioButton`	`TanreiRadioButton`	`TanreiRadioButton`	`RadioButton`
`checked` · 属性	`checked`	`selection`	`selected`	`groupValue`	`selected`
`value` · 属性	`value`	`value`	`onClick`	`value`	`value`
`name` · 属性	`name`	`TanreiRadioGroup`	`selectableGroup`	`TanreiRadioGroup`	`RadioGroup`
`label` · 属性	`label`	`title`	`label`	`label`	`label`
`disabled` · 属性	`disabled`	`disabled`	`enabled`	`enabled`	`disabled`

状态

行为

以 EARS 形式写成的需求。每个平台的实现都按这些 ID 逐条测试。需求原文取自规格文件，原样以英文呈现。

ID	需求
`FGR-1`	THE field group SHALL lay out, from top to bottom and from its start edge: its label row (FGR-2), its description (FGR-7) comp.field-group.supporting-text.gap below the last line of the label row, its controls (FGR-3, FGR-13) comp.field-group.label.gap below whichever of the two is drawn last, and its error text (FGR-8) comp.field-group.error-text.gap below the last control. It SHALL be as wide as its layout gives it and as tall as its rows and its controls together, SHALL draw no container, edge, fill or elevation of its own, SHALL add no padding around its rows, and SHALL place each control by the control's own bounds: it SHALL NOT shift, restyle or change the behaviour of a control.
`FGR-2`	WHILE label is not empty and labelHidden is false THE field group SHALL draw label above its controls, from the group's start edge, in comp.field-group.label.typescale and comp.field-group.standard.label.color (comp.field-group.standard.error.label.color WHILE error is true). The label SHALL wrap onto as many lines as it needs, and SHALL never be cut with an ellipsis or drawn over a control, because text enlarged to 200% must lose no content. WHILE labelHidden is true or label is empty THE field group SHALL draw neither the label row nor a gap below it, and SHALL draw no requirement mark (FGR-6).
`FGR-3`	WHILE orientation is vertical THE field group SHALL lay out its controls in one column in the order given, each from the group's start edge and given the group's whole width to lay itself out in — a field fills it; a checkbox, a radio button or a switch takes what its mark and its label need and wraps its label inside it — comp.field-group.gap.controls apart WHILE spacing is controls and comp.field-group.gap.fields apart WHILE spacing is fields.
`FGR-4`	THE field group SHALL take from required and optional what the form asks of the set: WHILE required is true it draws the required mark (FGR-5, FGR-6) and exposes the requirement (FGR-10, FGR-11); WHILE optional is true it draws the optional tag (FGR-5) and adds optionalText to the group's description (FGR-11), because assistive technology has no state for it; WHILE both are false it says nothing and draws nothing. THE field group SHALL NOT validate because of required: it SHALL NOT set the error condition for a missing answer or show an error text of its own; what a missing answer means is the product's to say with error and errorText. WHILE disabled is true THE field group SHALL keep its mark: an asterisk drawn from the group's disabled tokens (FGR-14), a requirement tag drawn as a tag inside something disabled (FGR-5, TAG-21).
`FGR-5`	WHILE the label is drawn and optional is true, or required is true and the required mark is tag (FGR-6), THE field group SHALL draw after the label's text, comp.field-group.requirement.gap from it and centred on the label's last line, a requirement tag: the Tag component, drawn as every tag is — size small, variant filled for required and tonal for optional, status default, no glyph and no dot, its label requiredText or optionalText on one line (TAG-1, TAG-2, TAG-5) — from the Tag's own tokens (comp.tag.container.height.small, comp.tag.label.typescale.small, comp.tag.filled.container.color, comp.tag.tonal.container.color and the others those sentences name). THE field group SHALL have no token for the requirement tag's fill, lettering, text style, paddings or corners and SHALL set none of the Tag's for it, so that a design system or a product that restyles its small tags restyles the requirement tag with them and nothing restyles the requirement tag alone. THE field group SHALL draw the requirement tag the same at rest and WHILE error is true, because a tag has no states (TAG-9) and what the form asks has not changed; WHILE disabled is true THE field group SHALL have it drawn as a tag inside something disabled (TAG-21), from the Tag's own disabled tokens, so that it fades with the label it follows. The requirement tag is text, never a control: it SHALL take no focus and no hover, focus or press answer of its own (FGR-12). It SHALL NOT make the label's row taller: where it is taller than the label's line it SHALL reach equally above and below that line. WHEN the label and the requirement tag do not fit on one line THE field group SHALL wrap the label (FGR-2) and move the tag whole to a line of its own after the label's last line, never cutting or splitting it. WHILE requiredText or optionalText is empty THE field group SHALL NOT draw the tag of that kind and in debug builds SHALL report it. THE field group SHALL keep both tags from assistive technology as drawn parts: what they say reaches it as FGR-10 and FGR-11 say.
`FGR-6`	WHILE required is true and the label is drawn THE field group SHALL draw the required mark that requiredMark names — tag (FGR-5), asterisk or none — and WHILE requiredMark is auto, the one comp.field-group.requirement.mark names: that token follows sys.behavior.requirement-mark, the design system's one answer for every field and every set of controls, unless a layer gives comp.field-group.requirement.mark a value of its own. As asterisk it SHALL draw the character "*" after the label's text, comp.field-group.requirement.asterisk-gap from it, in the label's text style, in comp.field-group.standard.required-asterisk.color (comp.field-group.standard.error.required-asterisk.color WHILE error is true), and SHALL keep it from assistive technology; as none it SHALL draw no mark. Whichever mark is drawn, and WHILE the label is not drawn, THE field group SHALL still expose the requirement (FGR-10, FGR-11).
`FGR-7`	WHILE supportingText is not empty THE field group SHALL draw it below the label row — at the group's top WHILE the label is not drawn — and above the controls, from the start edge, in comp.field-group.supporting-text.typescale and comp.field-group.standard.supporting-text.color (comp.field-group.standard.error.supporting-text.color WHILE error is true), wrapping onto as many lines as it needs and never cut. It SHALL keep its place and its words WHILE error is true, because it says how to answer; WHILE supportingText is empty THE field group SHALL draw neither the row nor its gap.
`FGR-8`	WHILE error is true THE field group SHALL draw errorText, WHILE it is not empty, in a row below its last control, from the start edge, in comp.field-group.supporting-text.typescale and comp.field-group.standard.error-text.color, wrapping and never cut; SHALL draw its label, its asterisk and its description from the error parts of its tokens (FGR-2, FGR-6, FGR-7); and SHALL put each selection control it holds in that control's own error condition where the control has one (a checkbox's error, CHK-4; a radio button's error form, RAD-26), so that the controls themselves are marked and not only the text. A control with no error condition (a switch) SHALL stay as it is drawn, and a control that reports its own errors in words (a text field, a field) SHALL keep the error the product gave it. WHILE error is false THE field group SHALL draw no error row and keep no room for it, and SHALL leave each control the error condition the product gave it: one control of a valid group may be in error by itself. THE field group SHALL never set error itself.
`FGR-9`	WHEN error becomes true, or errorText changes while error is true, and focus is inside the field group THE field group SHALL have assistive technology announce errorText once, politely; an error set while focus is elsewhere SHALL be read as part of the group's description when focus next enters the group (FGR-11). THE field group SHALL NOT move focus because of an error, and SHALL announce no other change of its texts.
`FGR-10`	THE field group SHALL expose itself to assistive technology as a group that contains its controls and is named by label, whether or not the label is drawn. WHILE kind is radio-group it SHALL be exposed as a radio group in that group's place, with a radio group's states (FGR-25). WHILE kind is group the group has neither a required nor an invalid state: each checkbox the field group put in its error condition (FGR-8) is exposed as invalid by that checkbox, and the requirement is given in words (FGR-11). WHILE label is empty THE field group SHALL still render and in debug builds report that the set has no accessible name.
`FGR-11`	THE field group SHALL make these the description of the group, in this order: supportingText; errorText WHILE error is true; requiredText WHILE required is true and kind is group, because a group has no required state to carry it and a radio group has one; optionalText WHILE optional is true. WHILE error is true it SHALL also make errorText part of the description of each control it put in its error condition (FGR-8) that is exposed as invalid by itself (a checkbox), after any description the control has of its own, so that a control exposed as invalid says why; a radio button in its error form SHALL be given neither the state nor the words, because its radio group carries both (FGR-25, RAD-26). WHEN one of these texts changes THE field group SHALL expose the new text at once. The requirement tag and the asterisk SHALL NOT be exposed as drawn parts.
`FGR-12`	THE field group SHALL NOT answer a press: a press on its label, its requirement mark, its description or its error text SHALL do nothing, and SHALL NOT move focus, because a set has no one control to receive it. THE field group SHALL add no stop to the focus order and handle no key: Tab reaches its controls as it would outside the group, and each control's keys are that control's.
`FGR-13`	WHILE orientation is horizontal THE field group SHALL lay out its controls in a row from the start edge in the order given, comp.field-group.gap-inline apart, their first lines aligned — each selection control as wide as its mark and its label need WHILE spacing is controls; each field given an equal share of the row, never less than comp.field-group.field.min-width nor than its content needs, WHILE spacing is fields, the fields aligned at their tops so that their labels start on one line. WHEN the controls do not fit in one row THE field group SHALL wrap the row onto further lines, comp.field-group.gap.controls apart WHILE spacing is controls and comp.field-group.gap.fields apart WHILE spacing is fields, and SHALL NOT cut, scroll or narrow a control below what its content needs; a control wider than the group SHALL take a line of its own and wrap its own label.
`FGR-14`	WHILE disabled is true THE field group SHALL draw its label, its asterisk, its description and its error text from its disabled tokens and its requirement tag as a tag inside something disabled (FGR-5, TAG-21), SHALL make every control it holds disabled as that control's own disabled does — not focusable, not operable, exposed as disabled — and SHALL expose the group as disabled where the platform has that state for a group; WHILE disabled is false THE field group SHALL NOT enable a control the product disabled itself. A disabled group SHALL keep its texts readable by assistive technology.
`FGR-15`	IF the field group holds radio buttons WHILE kind is group THEN THE field group SHALL frame them as it frames any control and SHALL add nothing that a set of radio buttons needs — no value, no required or invalid state, no radio group for assistive technology — and in debug builds SHALL report that a set of radio buttons is a radio group (RGP-1), or, written by hand, a field group whose kind is radio-group (FGR-25). WHERE a control it holds is a radio group or a checkbox group THE field group SHALL treat it as one member, as it treats a field group inside it (FGR-20): place and space it as a field, pass it disabled (FGR-14), and pass it neither its error nor its requirement. THE field group SHALL select nothing, hold no value, move no focus and emit no event.
`FGR-16`	WHILE the text size is enlarged THE field group SHALL grow with its texts: the label, the description and the error text wrap and never clip, the requirement tag grows with its text and keeps its paddings, a horizontal row wraps (FGR-13), and the rows keep their order and their gaps; at 200% no text SHALL be lost, lie over another part or need scrolling in two directions.
`FGR-17`	WHERE the platform draws with a person's own forced colors (the web's forced-colors mode, and a platform's equivalent where it has one) THE field group SHALL draw its label, its asterisk, its description and its error text in the platform's text color and its requirement tag as a tag is drawn there (an edge and a label in the text color, TAG-14), and SHALL rely on no color of its own to show an error: the error is carried by the words of errorText, by the invalid state (FGR-10) and by each control's own error condition.
`FGR-18`	WHERE the layout direction is right-to-left THE field group SHALL mirror its layout: the label row, the description, the controls and the error text start at the right edge, the requirement mark stands at the left of the label, and a horizontal row runs from right to left, the first control at the right. A column keeps its order from top to bottom in either direction.
`FGR-19`	THE field group SHALL take its layout direction from where it is used — the direction of the nearest ancestor that sets one, and the platform's own where none does — and SHALL have no direction setting of its own; WHEN that direction changes while the field group is shown THE field group SHALL draw itself for the new direction at once, without a motion of its own, keeping its controls, with their values, their selection and their focus.
`FGR-20`	IF the field group holds no control THE field group SHALL draw its rows without one and in debug builds report it. WHERE a control it holds is itself a field group THE field group SHALL treat it as one member: place and space it as a field, expose it as a group inside the group, pass it disabled (FGR-14), and pass it nothing else — neither its error nor its requirement.
`FGR-21`	THE field group SHALL lay out its label, its description, its error text and the text of its requirement tag as text of its own direction, isolated from the text around it: each takes the base direction of its first strong character, or the layout direction where it has none, so that a left-to-right word, a number with its sign or unit, a telephone number and an address keep their own order in a right-to-left layout and reorder nothing beside them; THE field group SHALL still place each and align its lines by the layout direction, not by the text's own.
`FGR-22`	WHEN requiredMark, orientation or kind names a value it does not know THE field group SHALL render with that prop's default (auto, vertical, group); WHEN spacing names a value that the active design system does not have THE field group SHALL render with the default value's tokens; and in debug builds THE field group SHALL report the unknown value.
`FGR-23`	THE field group SHALL leave its controls what they are: each keeps its own tokens, states, keyboard, events, value and place in a form, and THE field group SHALL emit no event, hold no value and take no part in form submission. WHEN a control is added, removed or moved while the group is shown THE field group SHALL lay out its controls again at once, without a motion, give the error condition and the disabled state it holds (FGR-8, FGR-14) to a control that came, take back from one that left everything it gave it, and leave focus on the control that has it.
`FGR-24`	THE field group SHALL have no words of its own: it SHALL take requiredText and optionalText from the instance's prop and, WHILE that is empty, from the product's words of the same name — the words a product sets once for all its components — and from nowhere else. IF neither gives requiredText WHILE required is true THE field group SHALL draw the asterisk of FGR-6 in the tag's place WHILE the required mark is tag, so that the requirement is still shown without a word, SHALL say nothing of the requirement to assistive technology WHILE kind is group, because a group has no required state and FGR-11 has no words to give it, whichever mark is drawn — WHILE kind is radio-group the required state says it without a word (FGR-25) — and in debug builds SHALL report the missing words once. IF neither gives optionalText WHILE optional is true THE field group SHALL draw no tag, SHALL add nothing to the description for it, and in debug builds SHALL report the missing words once.
`FGR-25`	WHILE kind is radio-group THE field group SHALL be exposed to assistive technology as one radio group in the place of the group of FGR-10 — never a radio group inside a group, nor a group inside a radio group — that contains its radio buttons: named by label, whether or not the label is drawn; required WHILE required is true; invalid WHILE error is true; disabled WHILE disabled is true (FGR-14); saying its orientation where the platform's radio group has one; and described as FGR-11 says, without requiredText, because the required state carries it. It SHALL change nothing that is drawn: its rows, its tokens, its measures and its layout are those of the same field group whose kind is group (FGR-1 to FGR-8, FGR-13). It SHALL hold the radio buttons of one group and no other control, and in debug builds SHALL report another control, radio buttons of more than one group, and a spacing other than controls. The radio buttons SHALL keep what their own group gives them — exclusion, the arrow keys, the single tab stop and each one's position in the set (RAD-3, RAD-4, RAD-5, RAD-16), from the radio group they stand in (RGP-3 to RGP-6) or, written by hand, from their name (RAD-25) — and THE field group SHALL still select nothing, hold no value, move no focus, handle no key and emit no event (FGR-12, FGR-15). WHERE the platform forms a radio group with a container of its own THE field group SHALL be the frame of that container and SHALL NOT expose a second group around it.
`FGR-26`	IF required and optional are both true THEN THE field group SHALL behave as WHILE required alone is true — it draws the required mark and no optional tag, and says no optionalText — and in debug builds SHALL report that optional is ignored, because a set is never both required and optional.
`FGR-27`	WHERE the platform has ARIA attributes (the web), WHEN the product sets an aria- attribute on the host, by the attribute or by the ARIA property that reflects it, THE field group SHALL move it to the data-aria- attribute of the same name, so that the host is no second node with its name, description or state, and SHALL expose it on the element that carries its role, its group (its radio group WHILE kind is radio-group) — an id reference by the elements it names in the host's tree or a tree around it, a description after its own — except those the field group owns (aria-label, aria-labelledby, aria-disabled, aria-required, aria-invalid, aria-errormessage), which it SHALL move and not expose: its name is label (FGR-10), its disabled, required and invalid states are its props (FGR-14, FGR-25) and its error message is errorText. WHEN the product removes the aria- attribute or its data-aria- twin, or sets the ARIA property that reflects it (ariaLabel, ariaDescribedByElements…) to null, THE field group SHALL take it off that element. WHEN the product sets an aria- attribute the field group owns THE field group SHALL report it in debug builds.

各平台名称对照

对等并不意味着 API 完全相同。同一份契约，由各平台以自己的惯用方式表达。

规格	Web	SwiftUI	Jetpack Compose	Flutter	React Native
组件	`tanrei-field-group`	`TanreiFieldGroup`	`TanreiFieldGroup`	`TanreiFieldGroup`	`FieldGroup`
`label` · 属性	`label`	`label`	`label`	`labelText`	`label`
`labelHidden` · 属性	`labelHidden`	`labelsHidden`	`labelHidden`	`labelHidden`	`labelHidden`
`supportingText` · 属性	`supportingText`	`supportingText`	`supportingText`	`helperText`	`supportingText`
`errorText` · 属性	`errorText`	`errorText`	`errorText`	`errorText`	`errorText`
`error` · 属性	`error`	`error`	`isError`	`isError`	`error`
`disabled` · 属性	`disabled`	`disabled`	`enabled`	`enabled`	`disabled`
`required` · 属性	`required`	`isRequired`	`required`	`required`	`required`
`optional` · 属性	`optional`	`isOptional`	`optional`	`optional`	`optional`
`requiredMark` · 属性	`requiredMark`	`requiredMark`	`requiredMark`	`requiredMark`	`requiredMark`
`requiredText` · 属性	`requiredText`	`requiredText`	`requiredText`	`requiredText`	`requiredText`
`optionalText` · 属性	`optionalText`	`optionalText`	`optionalText`	`optionalText`	`optionalText`
`orientation` · 属性	`orientation`	`orientation`	`orientation`	`orientation`	`orientation`
`spacing` · 属性	`spacing`	`spacing`	`spacing`	`spacing`	`spacing`
`kind` · 属性	`kind`	`kind`	`kind`	`kind`	`kind`
备注	`<tanrei-field-group label="Notify me by"><tanrei-checkbox label="Email"></tanrei-checkbox>…</tanrei-field-group>`: the controls are the elements of the default slot. They stay in the product's light DOM, so each keeps its place in a `<form>`, its `name` and `value` and its events; the group is not form-associated and holds no value. The shadow root holds a `<fieldset>` with a `<legend>` around the slot — the accessibility tree is built from the flattened tree, so the slotted controls are inside the group it names; every id it refers to is in the same shadow root. The description and the error text are referenced by `aria-describedby` on the fieldset, with visually hidden text for `requiredText` or `optionalText` where FGR-11 asks for them; `labelHidden` hides the legend visually and keeps it as the name. A `disabled` attribute on a fieldset in a shadow root does not reach slotted controls, so the group gives `disabled`, the error condition and the error text to each control itself: a Tanrei control asks for them with the composed `tanrei-field-connect` event a field answers, and any other element receives `disabled`, `aria-invalid` and `aria-description`; the group removes exactly what it set when an element leaves the slot (`slotchange`, FGR-23). The announcement of FGR-9 is a visually hidden `aria-live="polite"` element in the shadow root, written only while `:focus-within` holds. The controls are laid out by a flex container with `gap`, `flex-direction` by `orientation` and `flex-wrap: wrap` in a row. Attributes are kebab-case: `label-hidden`, `supporting-text`, `error-text`, `required-mark`, `required-text`, `optional-text`. The requirement tag is a `<tanrei-tag size="small">`, `filled` or `tonal`, with nothing set on it: it reads the Tag's tokens as every tag where the group stands does. The host is `display: block`. Words: the element has no words of its own. `required-text` and `optional-text` left empty read the product's words, set once with `setWords()` from `@tanrei/web`; the element draws again when they change. While `kind="radio-group"` the element that is the group — the same `fieldset`, with its `legend` — carries `role="radiogroup"`, `aria-labelledby` the legend (which stays in the tree while `label-hidden`), `aria-required` while `required`, `aria-invalid` while `error`, and `aria-orientation` as `orientation` says; the hidden text for `requiredText` is left out of `aria-describedby`. The states are attributes on that element and not ElementInternals, which the accessibility checks cannot see. Nothing else in the shadow root differs, so the two kinds are the same picture; whether an engine takes the role on a `fieldset`, or the build puts a `div` in its place for this kind, is held by the test that reads one radio group in the accessibility tree in three engines. `kind` is reflected. The radio buttons are slotted as any control: those of a `tanrei-radio-group` around the field group reach it through that element's slot, and those a product writes by hand carry one `name` (RAD-25). A `tanrei-radio-button` asks the group as a checkbox does and says that it draws an error condition; while `error` the group gives it `invalid` and nothing else — no description — and the radio button draws its error form and writes no `aria-invalid` (FGR-8, FGR-11, RAD-26). The radio group's `aria-invalid` stays on the `fieldset`. The tag's element carries no custom property and is centred on the label's line without its height being read; `required-mark` takes `tag`; and `--tanrei-comp-field-group-requirement-mark` is `var(--tanrei-sys-behavior-requirement-mark)` until a layer sets it.	`TanreiFieldGroup("Notify me by", supportingText:, errorText:, error:, required:, optional:, orientation:, spacing:) { TanreiCheckbox(…) … }`. `labelHidden` follows the `.labelsHidden()` environment and `disabled` follows `.disabled(_:)`, which disables the content. The content is laid out by a custom `Layout` (a column, or a row that wraps); the container is `.accessibilityElement(children: .contain)` with the label and the description as its label and hint, and the error condition reaches the controls through the environment (`\.tanreiField`). The product's words are read from the `\.tanreiWords` environment value. `kind: .radioGroup` makes the same container the radio group of the `TanreiRadioButton`s in it: iOS has no radio group trait, so the container keeps `.accessibilityElement(children: .contain)` with the label and the description, and required and invalid are added to its hint in words (FGR-25). Not built on this platform yet: in error it also puts each `TanreiRadioButton` it holds in its error form (FGR-8, RAD-26). Not built on this platform yet: the requirement tag as this platform's Tag at its small size with nothing of the field group's set on it (FGR-5); generated tokens with none of the field group's values for it and with the system's choice of mark, which the field group's own token follows (FGR-6); the first mark named tag.	`TanreiFieldGroup(label = "Notify me by", supportingText = …, isError = …, required = …, optional = …, orientation = …, spacing = …) { TanreiCheckbox(…) … }`. `enabled` is the inverse flag and reaches the content through `LocalTanreiFieldState`, with `isError` and the error text. A `Column` or a `FlowRow`; the container sets `semantics { contentDescription; stateDescription }` without merging its descendants. The product's words are read from `LocalTanreiWords`. `kind = TanreiFieldGroupKind.RadioGroup` applies `Modifier.selectableGroup()` to the container and adds the error to its semantics (FGR-25); the bare `TanreiRadioButton(selected, onClick)` is what stands in it one level down. Not built on this platform yet: in error it also puts each `TanreiRadioButton` it holds in its error form (FGR-8, RAD-26). Not built on this platform yet: the requirement tag as this platform's Tag at its small size with nothing of the field group's set on it (FGR-5); generated tokens with none of the field group's values for it and with the system's choice of mark, which the field group's own token follows (FGR-6); the first mark named tag.	`TanreiFieldGroup(labelText: 'Notify me by', helperText: …, errorText: …, isError: …, required: …, optional: …, orientation: …, spacing: …, children: […])`. `enabled` is the inverse flag. A `Column` or a `Wrap`; a `Semantics(container: true, label:, hint:)` node around the children, and an inherited `TanreiFieldScope` that gives the children the error condition and the disabled state. The product's words are read from the `TanreiWords` inherited widget, which the app fills from its own localizations. `kind: TanreiFieldGroupKind.radioGroup` makes the `Semantics` node the radio group of the radio buttons in it (FGR-25). Not built on this platform yet: in error it also puts each `TanreiRadioButton` it holds in its error form (FGR-8, RAD-26). Not built on this platform yet: the requirement tag as this platform's Tag at its small size with nothing of the field group's set on it (FGR-5); generated tokens with none of the field group's values for it and with the system's choice of mark, which the field group's own token follows (FGR-6); the first mark named tag.	`<FieldGroup label="Notify me by" supportingText="…">{children}</FieldGroup>`. A `View` with no role (React Native has no group role on iOS; the label is read as a header before the controls), `accessibilityLabel` and `accessibilityHint`; the children receive the error condition and the disabled state through `FieldContext`. A column, or a row with `flexWrap`. Follows the app's direction where an ancestor's is not known. The product's words are read from the `TanreiWordsProvider` context. `kind="radio-group"` gives the `View` `accessibilityRole="radiogroup"`; required and invalid are said in the hint, because React Native has neither state for a group (FGR-25). Not built on this platform yet: in error it also puts each `RadioButton` it holds in its error form (FGR-8, RAD-26). Not built on this platform yet: the requirement tag as this platform's Tag at its small size with nothing of the field group's set on it (FGR-5); generated tokens with none of the field group's values for it and with the system's choice of mark, which the field group's own token follows (FGR-6); the first mark named tag.

令牌

令牌	引用	解析值（浅色）
`--tanrei-comp-field-group-error-text-gap`	`sys.space.space50`	4px
`--tanrei-comp-field-group-field-min-width`	—	144px
`--tanrei-comp-field-group-gap-inline`	`sys.space.space200`	16px
`--tanrei-comp-field-group-gap-controls`	`sys.space.space100`	8px
`--tanrei-comp-field-group-gap-fields`	`sys.space.space300`	24px
`--tanrei-comp-field-group-label-gap`	`sys.space.space100`	8px
`--tanrei-comp-field-group-requirement-asterisk-gap`	`sys.space.space25`	2px
`--tanrei-comp-field-group-requirement-gap`	`sys.space.space100`	8px
`--tanrei-comp-field-group-requirement-mark`	`sys.behavior.requirement-mark`	0
`--tanrei-comp-field-group-standard-disabled-error-text-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-error-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-error-required-asterisk-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-error-supporting-text-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-required-asterisk-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-disabled-supporting-text-color`	—	#1b1b1b · 38%
`--tanrei-comp-field-group-standard-error-text-color`	`sys.color.error`	#cd262f
`--tanrei-comp-field-group-standard-error-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-field-group-standard-error-required-asterisk-color`	`sys.color.primary`	#1b1b1b
`--tanrei-comp-field-group-standard-error-supporting-text-color`	`sys.color.on-surface-variant`	#4b4b4b
`--tanrei-comp-field-group-standard-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-field-group-standard-required-asterisk-color`	`sys.color.primary`	#1b1b1b
`--tanrei-comp-field-group-standard-supporting-text-color`	`sys.color.on-surface-variant`	#4b4b4b
`--tanrei-comp-field-group-supporting-text-gap`	`sys.space.space50`	4px
`--tanrei-comp-field-group-label-typescale`	`sys.typescale.label`	500 14px/1.4286
`--tanrei-comp-field-group-supporting-text-typescale`	`sys.typescale.label-small`	500 12px/1.3333

测试样例

作为基准的渲染结果。所有平台都以相同的 ID 为每个样例截取快照，以便相互比较。

`spacing: controls` (43)

checkboxes

label: Notify me by items: 3

checkboxes-supporting

label: Notify me by supportingText: Choose all that apply. items: 3

checkboxes-required

label: Notify me by supportingText: Choose all that apply. required: true requiredText: Required items: 3

checkboxes-optional

label: Notify me by optional: true optionalText: Optional items: 3

checkboxes-required-asterisk

label: Notify me by required: true requiredMark: asterisk requiredText: Required items: 3

checkboxes-error

label: Notify me by supportingText: Choose all that apply. errorText: Choose at least one way to reach you. error: true required: true requiredText: Required items: 3

checkboxes-horizontal

label: Notify me by orientation: horizontal items: 3

checkboxes-horizontal-many

label: Days supportingText: The days the report is sent. orientation: horizontal items: 10

checkboxes-disabled

label: Notify me by supportingText: Choose all that apply. disabled: true required: true requiredText: Required items: 3

checkboxes-one-disabled

label: Notify me by items: 3

checkboxes-label-hidden

label: Notify me by labelHidden: true supportingText: Choose all that apply. items: 3

switches

label: Privacy supportingText: These apply to this device only. items: 3

switches-optional

label: Privacy optional: true optionalText: Optional items: 2

long-label

label: Which of these ways may we use to reach… supportingText: Choose all that apply. We use the first… errorText: Choose at least one way to reach you, or… error: true required: true requiredText: Required items: 3

checkboxes-required-ja

label: 連絡方法 supportingText: 当てはまるものをすべて選んでください。 required: true requiredText: 必須 items: 3

checkboxes-rtl

label: طرق الإشعار supportingText: اختر كل ما ينطبق. required: true requiredText: مطلوب direction: rtl items: 3

checkboxes-horizontal-rtl

label: ימים errorText: יש לבחור יום אחד לפחות. error: true orientation: horizontal direction: rtl items: 3

ltr-label-rtl

label: Wi-Fi 6E supportingText: 2.4 GHz, 5 GHz, 6 GHz direction: rtl items: 3

checkboxes-error-selected

label: Notify me by supportingText: Choose all that apply. errorText: This number cannot receive text messages… error: true required: true requiredText: Required items: 3

checkboxes-parent-none

label: Notify me by items: 4

checkboxes-parent-some

label: Notify me by items: 4

checkboxes-parent-all

label: Notify me by items: 4

checkboxes-parent-one-disabled

label: Notify me by items: 4

radio-buttons-default

label: Delivery kind: radio-group items: 3

radio-buttons-none-selected

label: Delivery kind: radio-group items: 3

radio-buttons-supporting

label: Delivery supportingText: You can change this until the order ship… kind: radio-group items: 3

radio-buttons-label-hidden

label: Delivery labelHidden: true supportingText: You can change this until the order ship… kind: radio-group items: 3

radio-buttons-required

label: Delivery supportingText: You can change this until the order ship… required: true requiredText: Required kind: radio-group items: 3

radio-buttons-optional

label: Delivery optional: true optionalText: Optional kind: radio-group items: 3

radio-buttons-required-asterisk

label: Delivery required: true requiredMark: asterisk kind: radio-group items: 3

radio-buttons-required-error

label: Delivery errorText: Choose how the order reaches you. error: true required: true requiredText: Required kind: radio-group items: 3

radio-buttons-error-selected

label: Delivery supportingText: You can change this until the order ship… errorText: Express delivery does not reach this add… error: true required: true requiredText: Required kind: radio-group items: 3

radio-buttons-error-one-disabled

radio-buttons-horizontal

label: Size orientation: horizontal kind: radio-group items: 3

radio-buttons-horizontal-many

label: Send the report supportingText: One report, on the day you choose. orientation: horizontal kind: radio-group items: 9

radio-buttons-disabled

label: Delivery supportingText: You can change this until the order ship… disabled: true required: true requiredText: Required kind: radio-group items: 3

radio-buttons-one-disabled

label: Delivery kind: radio-group items: 3

radio-buttons-long-label

label: How should we deliver the parts of this… supportingText: You can change this until the first parc… errorText: Choose how the order reaches you, or go… error: true required: true requiredText: Required kind: radio-group items: 3

radio-buttons-required-ja

label: 配送方法 supportingText: 発送されるまで変更できます。 required: true requiredText: 必須 kind: radio-group items: 3

radio-buttons-error-ja

label: 配送方法 errorText: 配送方法を選んでください。 error: true required: true requiredText: 必須 kind: radio-group items: 3

radio-buttons-rtl

label: طريقة التوصيل supportingText: يمكنك تغيير هذا حتى يُشحن الطلب. required: true requiredText: مطلوب kind: radio-group direction: rtl items: 3

radio-buttons-horizontal-rtl

label: גודל errorText: יש לבחור גודל. error: true required: true requiredText: חובה orientation: horizontal kind: radio-group direction: rtl items: 3

radio-buttons-ltr-label-rtl

label: Wi-Fi 6E supportingText: 2.4 GHz, 5 GHz, 6 GHz kind: radio-group direction: rtl items: 3

`spacing: fields` (4)

fields

label: Shipping address spacing: fields items: 3

fields-horizontal

label: City and postal code orientation: horizontal spacing: fields items: 2

fields-supporting

label: Billing address supportingText: Where the invoice is sent. optional: true optionalText: Optional spacing: fields items: 2

fields-optional-ja

label: お届け先 optional: true optionalText: 任意 spacing: fields items: 2

生成自 specs/field-group.spec.json, tokens/comp/field-group.tokens.json, design/tokens/

指南

字段组的用途

这一组控件	使用
回答同一个问题的复选框，或者同属一组设置的开关	字段组。
相互关联的字段：地址、分成几部分的日期	带 `spacing="fields"` 的字段组。
单选按钮	单选组，它就是包住这些单选按钮、同时保存它们那一个值的字段组。手写时，用 `kind="radio-group"` 的字段组（见下文）。
单个控件	字段。

一组单选按钮：`kind`

组既没有必填状态，也没有无效状态，所以字段组用文字说明必填与否，并把它的复选框逐个标记为无效。一组单选按钮则不同：它是作为一个整体必填、作为一个整体无效的。kind="radio-group" 告诉字段组，它的这一组是同一个组的单选按钮；这时对辅助技术来说，它就是这些单选按钮的单选组——设置了 required 时必填，error 为 true 时无效，并说出自己的方向——而 requiredText 不再是它描述的一部分，因为状态已经说明了这一点。

<tanrei-field-group kind="radio-group" label="配送方式" required required-text="必填">
  <tanrei-radio-button name="delivery" value="standard" label="标准配送（3–5 天）" checked></tanrei-radio-button>
  <tanrei-radio-button name="delivery" value="express" label="加急配送（次日达）"></tanrei-radio-button>
</tanrei-field-group>

种类为 radio-group 的字段组，包着同一个 name 的单选按钮

kind 改变的是暴露出来的内容，画出来的东西一点不变；字段组仍然不保存值，不移动焦点，也不处理任何按键：单选按钮凭它们的 name 保持自己的选择、自己的方向键和自己的那一个停靠点。这就是下一层的单选组。除非你需要以单选组没有的方式排布这一组，否则请使用单选组：它加上了那一个值、一个 change，以及作为一个控件在表单中的位置。

在这个种类下，组里放的是同一个组的单选按钮，没有其他可以操作的东西，spacing 保持为 controls。有别的控件、单选按钮用了两个 name，或者用了别的 spacing，调试构建都会报告。

它与字段的区别

一组控件比较高，要从上往下读，所以有两样东西的位置与字段不同：

描述位于标签下方、控件之前，并且在字段组处于错误状态时仍然保留。“可多选”必须在选项之前读到，回答被拒绝时，用户需要再看一遍的也正是它。
错误文本单独占一行，位于最后一个控件下方。

标签、必填和选填小标签，以及星号，都与字段的相同。说明表单要求的 required 和 optional 也一样：两者都设置时，这一组是必填的。

布局

orientation="vertical"（默认）把控件叠成一列。优先使用它：每个标签都从同一条边开始，从上往下读。
orientation="horizontal" 把控件排成一行，放不下时换行。只把它用于两三个简短的选项，或者要作为一行来读的字段，例如城市和它的邮政编码。换了行之后，就看不出哪个标签属于哪个标记了。
排成一行的字段平分这一行，且绝不窄于 comp.field-group.field.min-width（默认系统中为 144）：窗口较窄时，下一个字段会换到自己的一行，而不是被挤压到连输入的内容都被截断。字段需要更宽时，请设置这个令牌。
spacing 说明这一组里放的是什么。controls 让复选框和开关之间相隔一个触摸目标的距离；fields 让字段之间相隔表单中两个字段之间的距离，并让每个字段占满宽度。设计系统可以添加其他取值。

复选框或开关的标记位于它自己的容器里面，所以它的起点比字段组的标签略微靠里。字段组不会把它往外拉：控件正是在这个容器上绘制悬停和焦点环的。

错误

error 让这一组进入错误状态：绘制错误文本，每个复选框以自己的错误形态绘制，并暴露为无效，每个单选按钮也以它的错误形态绘制。单选按钮不会暴露为无效：它的角色没有这种状态，这一点由单选组来说明。开关没有错误形态，保持原样。字段组里的字段保留你给它的错误：每个字段用文字说明自己的错误，而字段组的错误针对的是整组（“请至少选择一项”）。

字段组有效时，其中的某一个控件仍然可以单独处于错误状态。

避免

不要不加说明就把单选按钮放进字段组：请使用单选组，或者设置 kind="radio-group"。在普通的组里，它们没有必填状态，也没有无效状态，调试构建会报告这一点。
不要只为了布局而使用字段组。没有共同的名称时，请自己为这些字段布局，并使用同一个间距令牌（comp.field-group.gap.fields）。
字段组的嵌套不要超过一层。组里的组是它的一个成员，会被读作组中之组。

无障碍

角色: group
标注: label names the group, drawn or not (labelHidden). Each control keeps its own name, its own label beside it. The group's description is supportingText, then errorText while error is true, then requiredText while the group is required, then optionalText while it is optional. A checkbox the group put in its error condition is exposed as invalid by itself and is described by errorText; a radio button is drawn in its error form and says neither, because the radio group it is in says both. The requirement tag and the asterisk are hidden. While kind is radio-group the group is a radio group: it carries the required and the invalid state itself, so requiredText is not said in its description (FGR-25).
最小目标: 即使外观尺寸更小，点击区域也满足最小目标尺寸。 minimum 32px · pointer 44px · spacing 8px · touch 48px

键盘操作

按键	动作
`Tab / Shift+Tab`	Moves focus to each enabled control of the set in the order given, and once into a radio group it holds and out of it (RGP-6). The group itself is not a stop.
`Space, the arrow keys and every other key`	The focused control's own, as its spec says: the group handles none (FGR-12, FGR-15).

备注

Not interactive by itself: the group takes no focus, no key and no press (FGR-12), so it has no target of its own and minimumTarget holds through its controls. The distance between two selection controls (FGR-3) leaves each a whole touch target.
The frame is the field's, for a set: the label (FGR-2), the requirement (FGR-4 to FGR-6) and the error (FGR-8, FGR-9) carry the numbers and the token names of FLD-2, FLD-4 to FLD-6, FLD-8 and FLD-9, with the same values. Two things differ, and both because a set is tall and is read from the top: the description stands under the label, before the controls, and stays while the group is in error; and the error text is a row of its own below the controls.
On the web the group is a `fieldset` with a `legend`. A group role has no required and no invalid state, which is why the group says requiredText in its description and marks its checkboxes invalid one by one. A set of radio buttons has both states: kind radio-group makes the same element their radio group (FGR-25). It also has a value, which a field group never holds: the Radio group does.
A set of radio buttons is the Radio group component: this field group in its radio-group kind, around the radio buttons, with what a frame cannot have added — the chosen value, one change event, the arrow keys and the single tab stop kept for the set, and a place in a form as one control (RGP-3 to RGP-9). The same set written by hand, one level down, is a field group whose kind is radio-group around radio buttons of one name: the same picture and the same radio group, without the value (FGR-25). A radio group may stand in a field group among fields, as one member (FGR-15). A set of checkboxes that is one answer under one name is a checkbox group, which holds the list of what is checked (CKG-1); checkboxes that each have a name of their own, and switches, need none of that and are a field group.
Prefer a column. A row of options is read across and then down once it wraps, and a wrapped row hides which label belongs to which mark; keep horizontal for two or three short options and for fields that are read as one line (a city and its postal code).
Errors are words (WCAG 3.3.1, 1.4.1): errorText says what is wrong with the set and how to put it right. It is announced when it appears under the person's focus and is otherwise read with the group and with each control marked invalid (FGR-9, FGR-11); it never takes focus away. A summary of every refused answer above the form is a live Callout in its error status, built by the product.
A group of fields (spacing fields) gives the fields a shared name — "Shipping address" before "Street" — which matters where two sets repeat the same labels. It passes them no error: each field says its own.
Heights are the texts' and the controls': at 200% text size every text wraps, a row becomes a column, and nothing is cut (WCAG 1.4.4, 1.4.10).
How a state looks is a value decision of the active design system; components read the state's tokens and never compute the effect themselves.

生成自 specs/field-group.spec.json, tokens/sys/measure.tokens.json

组件负责的部分

在 Web 上，字段组是一个带 legend 的 fieldset：一个包含其控件的组，由 label 命名，无论它是画出来的，还是用 labelHidden 隐藏的。
字段组的描述是 supportingText；error 为 true 时，后面接 errorText；再后面是 requiredText 或 optionalText。组没有必填状态，也没有无效状态，所以必填和选填要用文字说明。
被字段组置于错误状态的每个复选框，各自暴露为无效，并以错误文本作为描述。
设置 kind="radio-group" 后，同一个元素就是一个单选组：必填状态、无效状态和方向都由它自己带着，requiredText 不进入它的描述。在 Web 上它仍是同一个 fieldset，带着单选组的角色。
disabled 会禁用每一个控件，并把字段组暴露为禁用。启用的字段组绝不会启用你自己禁用的控件。
焦点位于字段组内时出现或改了措辞的错误，会以礼貌（polite）的方式朗读一次。焦点绝不会因为错误而移动。
字段组不是焦点顺序中的停靠点，不接收任何按键，也不响应按下：Tab 按给定的顺序到达每一个启用的控件。
必填和选填小标签以及星号对辅助技术隐藏。
文本放大到 200% 时，所有文本都会换行，排成一行的控件变成一列，不会有任何内容被截断。
在强制颜色模式下，所有文本都采用系统的文本颜色，必填和选填小标签会多出一道边线。
在从右到左的布局中，各行从右侧开始，排成一行的控件从右侧排起，每段文本保持自己的方向。
kind 为 group 的字段组里有单选按钮、字段组里没有控件，以及字段组没有标签，都会在调试构建中报告。

Web 上的已知差距：

复选框的描述是用 aria-description 提供的，它还没有在每一种屏幕阅读器上验证过。
在元素定义之前，控件出现在页面上时没有字段组的标签、描述和布局。

需要你做的事

为字段组提供 label。
自己校验回答，设置 error，并编写说明如何改正的 errorText。
给出必填和选填的文字：把 required-text 和 optional-text 写在字段组上，或者用 setWords({ requiredText, optionalText }) 为整个产品只给一次。它们会作为字段组描述的一部分被朗读，而组没有必填状态：没有 requiredText，就没有任何东西告诉辅助技术这里必须回答。Tanrei 不自带任何文字；缺少的文字会在开发时报告。参见产品的文字。
提交失败之后，还要在表单上方说明哪些内容被拒绝，并逐一链接到各个控件：使用一个带 live、处于错误语义状态的提示块。

GitHub 上的源码与 Issue

概览

用法

规格

构成

属性

条目

checkbox

switch

text-field

radio-button

状态

行为

各平台名称对照

令牌

测试样例

spacing: controls (43)

spacing: fields (4)

指南

字段组的用途

一组单选按钮：kind

它与字段的区别

布局

错误

推荐

避免

无障碍

键盘操作

备注

组件负责的部分

需要你做的事

`checkbox`

`switch`

`text-field`

`radio-button`

`spacing: controls` (43)

`spacing: fields` (4)

一组单选按钮：`kind`