セレクトフィールド

概要

link

Web

tanrei-select-field

schedule

SwiftUI

TanreiSelectField

radio_button_unchecked

Jetpack Compose

TanreiSelectField

radio_button_unchecked

Flutter

TanreiSelectField

radio_button_unchecked

React Native

SelectField

radio_button_unchecked

提供しないバリアント

tanrei: filled, outlined

生成元 docs/status/status.json, specs/select-field.spec.json

必須のセレクトフィールドと、グループに分けてフィールドを表すグリフを置いたもの

カナダフランス日本ケニアニュージーランドpublic東京ソウルリスボンベルリン

セレクトフィールドは、フォームの中で、あらかじめ決まっていて、ほかの値を受け付けないリストから 1 つの値を選ぶときに使います。国、タイムゾーン、プランなどです。ラベル、選ばれているオプションを表示してリストを開くボックス、補足の 1 行、値を受け付けなかったときの言葉という、いつもの組み合わせが、そのまま使える形でそろっています。

構成要素は、フィールドとセレクトです。フィールドは枠で、ラベル、必須または任意の印、補足、エラーを受け持ちます。セレクトはコントロールで、トリガーとリスト、その中でユーザーが行うすべてを受け持ちます。セレクトフィールドが自分で描くものはなく、トークンもありません。プロパティはどれも 2 つのどちらかのもので、そのまま渡されます。渡したオプションは、中のセレクトのオプションになります。

幅は置かれた場所に合わせて広がり、ボックスはその幅いっぱいに広がります。ボックスを狭くするには、置く場所を狭くします。

Web では、<tanrei-option> を子に持つ <tanrei-select-field> です。ほかのプラットフォームはまだ実装していません。

使い方

link

オプションはセレクトフィールドの子で、それぞれが値とラベルを持ちます。選ばれているオプションは value で指定します。change と toggle はセレクトのイベントで、どちらかを受け取った時点で、フィールドの value と open はすでに新しい値になっています。

<form>
  <tanrei-select-field name="country" label="国" value="jp" required required-text="必須"
    supporting-text="請求書の宛先になります。">
    <tanrei-option value="ca">カナダ</tanrei-option>
    <tanrei-option value="jp">日本</tanrei-option>
  </tanrei-select-field>
</form>

<!-- グループに分け、ラベルの下に 1 行を添え、フィールドを表すグリフを置いた例。 -->
<tanrei-select-field label="タイムゾーン" value="Europe/Lisbon">
  <span slot="leading-icon">public</span>
  <tanrei-option-group label="アジア">
    <tanrei-option value="Asia/Tokyo" supporting-text="UTC+9">東京</tanrei-option>
  </tanrei-option-group>
  <tanrei-option-group label="ヨーロッパ">
    <tanrei-option value="Europe/Lisbon" supporting-text="UTC+0">リスボン</tanrei-option>
  </tanrei-option-group>
</tanrei-select-field>

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

  const country = document.querySelector('[name="country"]');
  // ユーザーが別のオプションを選びました。value はすでに新しい値です。
  country.addEventListener('change', () => save(country.value));
  // ユーザーが開いたか、閉じました。閉じたときは理由が付きます。
  country.addEventListener('toggle', (e) => console.log(e.detail.open, e.detail.reason));
  // 検証は利用者側で行います。セレクトフィールドが自分で error を設定することはありません。
  country.error = submitted && !ships(country.value);
  country.errorText = 'この国にはまだ発送できません。別の国を選んでください。';
</script>

import { Option, SelectField } from '@tanrei/react';

<SelectField label="国" value={country} required requiredText="必須" onChange={(event) => setCountry(event.currentTarget.value)}>
  <Option value="ca">カナダ</Option>
  <Option value="jp">日本</Option>
</SelectField>

1 つ下の階層

link

同じフィールドを 2 つの構成要素から自分で書いても、見た目は同じで、支援技術にとっても同じコントロールになります。

<tanrei-field label="国" required required-text="必須"
  supporting-text="請求書の宛先になります。">
  <tanrei-select name="country" placeholder="国を選択">
    <tanrei-option value="jp">日本</tanrei-option>
    <tanrei-option value="ke">ケニア</tanrei-option>
  </tanrei-select>
</tanrei-field>

同じフィールドを自分で書いたもの。フィールドの中にセレクトがあります

日本ケニア

セレクトフィールドにない並べ方が必要なときに、1 つ下の階層で書きます。

必要なもの	使うもの
ラベル、ボックス、補足、エラー	セレクトフィールド
枠の中、ボックスの横や下に置く自分の要素	フィールドに、セレクトと自分の要素を入れる
ボックスだけ。ラベルは別の場所にある（バーに置くテーマ、ツールバーに置く並び順、テーブルのセル）	セレクトを単独で使い、セレクトの label で名前を付ける
スクロールするより入力したくなるほど長いリスト	コンボボックス

1 つ下の階層で変わるのは、何をどこに指定するかです。name、value、オプションはセレクトに指定し、フォームに加わるコントロールもイベントが届く先もセレクトになります。label、error、disabled はフィールドに指定したままにします。フィールドがコントロールに伝えるので、セレクトの側には指定しません。

仕様

link

補足テキストと無効なオプション、任意、エラー、読み取り専用、無効

フリーチームエンタープライズヨーロッパ、中東、アフリカアジア太平洋日本ケニア日本ケニア日本ケニア

Filled と Outlined。フィールドのラベルがセレクトのボックスの中で浮き上がり、必須のフィールドにはアスタリスクが付きます

日本ケニア日本ケニア

m3-like で表示

それぞれの構成要素が受け持つもの

link

観点	フィールドから	セレクトから
プロパティ	label、labelHidden、supportingText、errorText、error、disabled、required、optional、requiredMark、requiredText、optionalText	variant、size、value、placeholder、readOnly、open、separation、iconSpace、status、statusText、emptyText
イベント	—	change、toggle
スロット	label-icon	leading-icon と、オプション
トークン	comp.field.*	ボックスは comp.input-box.*（すべての入力ボックスが読みます）。リストは comp.select.*

セレクトは、自分の label、labelHidden、error、disabled を持っています。これらはセレクトフィールドのプロパティではありません。フィールドの label がコントロールに名前を付け、error がボックスをエラーの状態にし、disabled がボックスを無効にします。そのため、どれもセレクトフィールドに 1 回指定すればよく、ラベルもコントロールと一緒に変わります。

stacked では、ラベルはボックスの上にあるフィールドの行です。filled と outlined では、同じラベルをセレクトがボックスの中で浮き上がるラベルとして描き、フィールドはラベルの行を描きません。このとき必須のフィールドは、デザインシステムがどの印を指定していても、ラベルの後のアスタリスクで示されます。補足は、先頭のアイコンを過ぎた、値の始まる位置から始まります。リストが開いている間は、ボックスと同じように、ラベルと補足もフォーカスされた状態で描かれます。

トリガーとリストの動き（開く、矢印キー、文字の入力、選ぶ、グループ）はセレクトのページに、枠の動き（必須の印、補足、エラーとその読み上げ）はフィールドのページにあります。

1 つのフィールドだけを変える

link

セレクトフィールドに自分のトークンはありません。枠はフィールドのトークンを、ボックスとリストはセレクトのトークンを、どこで設定されていても読みます。1 つだけ変えるには、構成要素のトークンをその要素に設定します。

<tanrei-select-field label="国"
  style="--tanrei-comp-field-label-gap: 12px"></tanrei-select-field>

構成要素

構成要素

Web パッケージが描くフィクスチャ stacked-empty の上に描いています。

パーツ	説明
1 field	The Field: the label row with its glyph and its requirement mark, and the supporting row with the help and the error text. In a look whose select floats the label it draws no label row.
2 select	The select, as the Field's one control: the trigger with the value it shows, its leading icon and its chevron, the label that floats in it in the looks that float one, and the list of options that opens from it.

プロパティ

プロパティ	型	既定値	説明
variant	stacked | filled | outlined	"stacked"	The text input's three looks, so that a select is drawn as the text inputs beside it. Stacked is a filled box that shows focus and error with a line inside its edge and draws no label: the label of the Field that frames it stands above it. Filled and outlined float the label inside the box. Use one style per form. A design system may leave some out (the Tanrei system ships stacked only) or add values. — Select
size	small | medium | large	"medium"	Minimum height of the container: stacked 32 / 40 / 56, as tall as a Button of the same size, so that the box and a Button side by side in one row stand as tall as each other; filled and outlined 40 / 48 / 56, which hold the label that floats inside them. The text input's three sizes: medium and large for forms, small for a select in an app bar, a toolbar or a dense row of controls, where nothing frames it. The hit area always meets the minimum target. A design system may add values. — Select
value	string	""	The value of the chosen option. The select shows that option's label; while value names no option it shows the placeholder. An option whose value is the empty string is a choice like any other ("None", "Any") and is the chosen one while value is empty. — Select
label	string	""	Names the control, visibly and to assistive technology. Required, unless the control names itself (a checkbox or a switch with its own label): then leave it empty and the field adds only help and an error. — Field Names the select. In a filled or outlined look the select draws it, floating in its box, and the Field draws no label row (FLD-25, SEL-15).
labelHidden	boolean	false	Does not draw the label, which stays the accessible name. For a control whose visible label is elsewhere (a table column, a toolbar). — Field Hides the label wherever it would be drawn: the Field's row, or the select's floating label (FLD-25).
placeholder	string	""	A hint shown while nothing is chosen and the label is not in the line ("Choose a country"). Never a replacement for label, and never a choice. — Select
supportingText	string	""	Help shown below the control and given to assistive technology as the control's description. While the field is in error it gives way to errorText, unless the design system keeps both (comp.field.error-text.placement append). — Field
errorText	string	""	Shown while error is true, in supportingText's place — or below it, which then stays, where the design system's comp.field.error-text.placement is append: what is wrong and how to put it right, in words. — Field
error	boolean	false	Puts the field in the error condition: the error text is drawn, the control is exposed as invalid and, where it has an error condition of its own, drawn in it. What a value means is the product's to validate; the field never sets this itself. — Field The Field puts its select in the select's own error condition (FLD-8, SEL-9).
disabled	boolean	false	Disables the control and draws the frame as disabled. Disable a framed control here, not on the control, so that its label follows. — Field The Field disables its select (FLD-14, SEL-46); the select field is then left out of its form (SEF-2).
readOnly	boolean	false	The value is shown, can be focused and is submitted, but cannot be changed: the list does not open and no chevron is drawn. — Select
required	boolean	false	What the form asks of the control: 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. — Field The Field exposes its select as required (FLD-10, SEL-11).
optional	boolean	false	Draws the optional tag after the label and adds optionalText to the control's description, because assistive technology has no state for it. Ignored while required is true: a control is never both. — Field
requiredMark	auto | tag | asterisk | none	"auto"	How this control 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.requirement.mark, which follows sys.behavior.requirement-mark, the system's one answer. Ignored unless required is true. — Field
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, FLD-24 says what is drawn. — Field
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. — Field
open	boolean	false	Whether the list is shown. The select opens and closes itself and emits toggle; the product may also set it. Ignored while the select is disabled or read-only or has nothing to show: no option, no status row and no empty text (SEL-61). — Select
separation	auto | divider | gap	"auto"	How a group of options is told from what is next to it. divider: a line between them. gap: empty space and no line. Auto takes comp.select.separation, which follows the design system's choice. — Select
iconSpace	auto | always | never	"auto"	Whether an option keeps the room of the leading icon column where it has no icon, so that the labels of a section start on one line — a section being an option group, or a run of adjacent options outside any group. auto: an option keeps the column while another option of its section has a leading icon, so that a section without icons starts its labels where the row's content starts. always: every option keeps it. never: only an option that has an icon has the column. The menu's iconSpace, with the same values and default (SEL-66). — Select
density	regular | compact	"regular"	How much room an option of the list takes: its least height, its paddings, the gap between its columns and the size of its glyphs (the leading icon, the check), and never its text style. regular (a 48 row in the default system) is for a product used by touch as well as by pointer; compact (a 32 row with 20 glyphs, the menu's compact row) is for a tool used with a pointer, whose lists are long. For touch an option is never lower than the touch target in either (SEL-37). The field's own box is not changed: its height is size's. A design system may add values. — Select
status	idle | loading | error	"idle"	What the product's source of options is doing, which the product sets: idle (the options given are final), loading (options are on their way: the status row shows a loading indicator and the list is marked busy) or error (the source failed: the status row shows statusText in the error color, announced at once). The combobox's and the search's values, with the same meaning. The select never loads anything itself. — Select
statusText	string	""	The status row's text, in the product's language, read to assistive technology when the list opens and when it changes: a count ("20 of 340 projects shown"), that loading failed ("Projects could not be loaded"), or, while status is loading, the loading indicator's name ("Loading projects"). Empty draws no status row unless status is loading. — Select
emptyText	string	""	Shown in the list while the select holds no option, status is idle and statusText is empty, in the product's language ("No projects yet"), so that the select still opens and says why there is nothing to choose. The product's: Tanrei has no words for it. Empty reads the product's words (noOptionsText); with neither, the select has nothing to show and does not open (SEL-61), and it is reported. — Select

スロット

スロット	説明
leading-icon	A glyph at the start of the container that stands for the field whatever is chosen (a globe before a language). It takes the place of the chosen option's own glyph. — Select
label-icon	A glyph before the label. — Field

イベント

イベント	説明
change	The person chose an option whose value differs from the select's; carries the new value. Not emitted when the product sets value, when the chosen option is chosen again, or while the person only moves through the list. — Select
toggle	The list was opened or closed by the person; carries the new open and, for a close, the reason: select, escape, back, outside, focus-out, anchor-hidden, press or tab (in the platform's casing). After a choice it follows change. — Select

アイテム

このコンポーネントが繰り返すアイテムの種類です。フィクスチャはアイテムを順に並べ、各プラットフォームはそれぞれの流儀で種類ごとに名前を付けます。

option

One choice of the select: a label, the value it stands for, and optionally a supporting line and a glyph.

プロパティ	型	既定値	説明
label	string	""	The option's text and its accessible name; the container shows it once the option is chosen. Required.
value	string	""	Identifies the choice: the option is the chosen one while the select's value equals it. Unique within the select. The empty string is a value like any other, for an option that stands for no choice ("None").
supportingText	string	""	A line below the label that says more about the choice. Shown in the list, not in the container.
leadingIcon	string	""	The name of an icon (a glyph of the system's icon set) before the label; the container shows it too while the option is chosen and the select has no leading icon of its own.
disabled	boolean	false	Prevents the option from being chosen. It stays reachable with the arrow keys.

仕様	Web	SwiftUI	Jetpack Compose	Flutter	React Native
アイテム	tanrei-option	TanreiSelectOption	TanreiSelectOption	TanreiSelectOption	SelectOption
label · プロパティ	label	title	text	label	label
value · プロパティ	value	tag	value	value	value
supportingText · プロパティ	supportingText	supportingText	supportingText	supportingText	supportingText
leadingIcon · プロパティ	leadingIcon	leadingIcon	leadingIcon	leadingIcon	leadingIcon
disabled · プロパティ	disabled	disabled	enabled	enabled	disabled
備考	<tanrei-option> children of <tanrei-select-field>, exactly as of <tanrei-select>: the product's elements in the light DOM, passed to the select inside through the default slot and read by it as data (web-options.md).	The select's own option, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option, under the same name: the select field passes it to its select and reads nothing of it.

option-group · グループ — アイテムを含む

A run of related options, optionally titled. The select separates a group from what is next to it by a divider or a gap.

プロパティ	型	既定値	説明
title	string	""	A short heading drawn above the group's options, which also names the group; empty draws none and leaves the group unnamed.

仕様	Web	SwiftUI	Jetpack Compose	Flutter	React Native
アイテム	tanrei-option-group	TanreiSelectSection	TanreiSelectGroup	TanreiSelectGroup	SelectOptionGroup
title · プロパティ	label	title	title	title	title
備考	As the option: the same element, the product's child, with its options inside it.	The select's own option group, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option group, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option group, under the same name: the select field passes it to its select and reads nothing of it.	The select's own option group, under the same name: the select field passes it to its select and reads nothing of it.

状態

振る舞い

EARS 記法による要件です。各プラットフォームの実装は、この ID に対応するテストで検証されます。要件の原文は仕様ファイルのものをそのまま掲載しています。

ID	要件
SEF-1	THE select field SHALL be a Field that frames one select, and nothing else. It SHALL give label, labelHidden, supportingText, errorText, error, disabled, required, optional, requiredMark, requiredText and optionalText to its Field and every other prop to its select, each unchanged; SHALL hold the label-icon slot for its Field and the leading-icon slot for its select; SHALL give its select every option and option group the product gives it, in the order given, as that select's own items, read, drawn and chosen by the select (SEL-17, SEL-31 to SEL-45); and SHALL emit its select's events as its own, each once. It SHALL draw no part of its own, hold no state of its own and have no token of its own: what it shows, how it behaves and what it exposes to assistive technology SHALL be exactly what that Field and that select do when a product places the one in the other (FLD-1 to FLD-28; SEL-1 to SEL-64) — the label row and its requirement mark (FLD-2 to FLD-6), or the label that floats in the box with the Field's row left out (FLD-25, SEL-15, SEL-7); the supporting row and the error, started where the value starts (FLD-7 to FLD-9, FLD-26); the rows drawn focused while the list is open (FLD-13, SEL-20); the name, the description and the states (FLD-10, FLD-11, FLD-14, SEL-11); and the width, which is the Field's and which the select fills (FLD-1, SEL-49).
SEF-2	WHERE the platform has forms (the web) THE select field SHALL be the one control the form sees: it SHALL take name, submit its select's value, reset to the value it was first given, restore it on navigation, report to the form's constraint validation exactly what its select would report there (SEL-11), be submitted WHILE readOnly is true (SEL-47), and be left out WHILE disabled is true or a disabled group of the form holds it (SEL-46); its select and its Field SHALL take no part in the form themselves.
SEF-3	WHEN the select field is given focus — by the product, by a press on its label row (FLD-12), or by a form that reports its validity — THE select field SHALL pass the focus to its select's container and SHALL add no stop to the focus order: the one stop inside it is its select's (SEL-13). WHILE focus is anywhere inside it, or its select's list is open, THE select field SHALL count as focused for its Field (FLD-13).
SEF-4	IF the select field is placed in a Field THE select field SHALL in debug builds report that it is a field already and that the bare control is the select, and both SHALL still render (FLD-15). WHILE it stands in a field group THE select field SHALL follow that group's disabled, through its own Field, and take nothing else from the group (FGR-20).
SEF-5	THE select field SHALL have no words of its own and SHALL read none: requiredText and optionalText are read by its Field (FLD-24), emptyText by its select (SEL-62), each from the instance's prop and then from the product's words.
SEF-6	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 select field 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 — an id reference by the elements it names in the host's tree or a tree around it, an error message as part of the description while the select field is invalid — except those the select field owns (aria-label, aria-labelledby, aria-disabled, aria-haspopup, aria-expanded, aria-controls), which it SHALL move and not expose: its name is label (SEF-1). 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 select field SHALL take it off that element. WHEN the product sets an aria- attribute the select field owns THE select field SHALL report it in debug builds.

プラットフォーム別の名前対応

パリティは API が同一であることを意味しません。同じ契約を、各プラットフォームの流儀で表現します。

仕様	Web	SwiftUI	Jetpack Compose	Flutter	React Native
コンポーネント	tanrei-select-field	TanreiSelectField	TanreiSelectField	TanreiSelectField	SelectField
variant · プロパティ	variant	variant	variant	variant	variant
size · プロパティ	size	size	size	size	size
value · プロパティ	value	selection	value	value	value
label · プロパティ	label	label	label	labelText	label
labelHidden · プロパティ	labelHidden	labelsHidden	labelHidden	labelHidden	labelHidden
placeholder · プロパティ	placeholder	prompt	placeholder	hintText	placeholder
supportingText · プロパティ	supportingText	supportingText	supportingText	helperText	supportingText
errorText · プロパティ	errorText	errorText	errorText	errorText	errorText
error · プロパティ	error	error	isError	isError	error
disabled · プロパティ	disabled	disabled	enabled	enabled	disabled
readOnly · プロパティ	readOnly	readOnly	readOnly	readOnly	readOnly
required · プロパティ	required	isRequired	required	required	required
optional · プロパティ	optional	isOptional	optional	optional	optional
requiredMark · プロパティ	requiredMark	requiredMark	requiredMark	requiredMark	requiredMark
requiredText · プロパティ	requiredText	requiredText	requiredText	requiredText	requiredText
optionalText · プロパティ	optionalText	optionalText	optionalText	optionalText	optionalText
open · プロパティ	open	isPresented	expanded	controller	open
separation · プロパティ	separation	separation	separation	separation	separation
iconSpace · プロパティ	iconSpace	iconSpace	iconSpace	iconSpace	iconSpace
density · プロパティ	density	density	density	density	density
status · プロパティ	status	status	status	status	status
statusText · プロパティ	statusText	statusText	statusText	statusText	statusText
emptyText · プロパティ	emptyText	emptyText	emptyText	emptyText	emptyText
change · イベント	change	selection	onValueChange	onChanged	onValueChange
toggle · イベント	toggle	isPresented	onExpandedChange	onOpenChanged	onOpenChange
備考	The tag tanrei-select-field, the class TanreiSelectField, the React name SelectField. It takes every attribute, property, event and child of the select and of its Field, under the same names. The element is composed as every field element is; what follows is what is particular to it. Members: <tanrei-field> holding one <tanrei-select> in its default slot; the product places none, and gives the options. The host is display: block, as the Field is. Value member: tanrei-select. The host is the form's element — name, the value and its state, validity anchored on the select's trigger, reset to the value attribute, restore, form, a disabled fieldset — and the select inside has no name. Props, set as properties on the member each is from. On the Field: label, labelHidden, supportingText, errorText, error, disabled, required, optional, requiredMark, requiredText, optionalText. On the select: variant, size, value, placeholder, readOnly, open, separation, iconSpace, status, statusText, emptyText, and inline, the select's attribute for tests and fixtures, which is no prop of the spec and is passed on so that an open fixture and its twin are staged alike. Attributes are the members' own: kebab-case, except readonly. Props of one name on both members — label, labelHidden, error, disabled — are the Field's; the select's are never set by the element and reach the select through the connection. Events: change is the select's own composed, bubbling Event and leaves by itself with the host as its target. toggle is the select's CustomEvent, composed and not bubbling: it is heard on the host, as on any shadow host, and by no ancestor. Two props are the select's at every moment and are read through to it, never copied — value (the element's value is its value member's) and open, by the same accessor, as the combobox field reads its three — so each is already new in every listener of change and of toggle, capturing or bubbling, and when open is taken back with no event. No listener of the element's takes either. None is stopped and none is copied. Slots: label-icon is passed to the Field and leading-icon to the select, each by a slot element of the same name rendered only while the host has a child for it. The default slot is passed to the select — <tanrei-select><slot></slot></tanrei-select> — and is always rendered, where a field element otherwise has no default slot: the product's <tanrei-option> and <tanrei-option-group> children are assigned to it, and the select reads them through it. A child that is neither, and has no slot name the element has, is not rendered and is reported in a debug build. Parts: the member hosts are field and select. Exported from the Field: label, label-icon, requirement-label, supporting-text, counter (never drawn here). Exported from the select: container, outline, active-indicator, label, requirement-label, value, placeholder, leading-icon, chevron, list, option, option-label, option-supporting-text, option-leading-icon, mark, group, group-title, divider, status. Two names collide, label and requirement-label. Each is exported with its member's name before it, always (field-label, select-label, field-requirement-label, select-requirement-label), and under the bare name from both members as well, because the two are one thing to a person and are never drawn at once: FLD-25 is the sentence that holds it. Focus: the shadow root does not delegate. focus() and blur() call the select's; a press on the label row focuses the trigger by FLD-12 and opens nothing, a press on the trigger opens the list, and a press on the help does nothing. The list is the select's own popover in the top layer: it is placed against the trigger, both in the select's shadow tree, and a press on the Field's rows is a press outside it (SEL-27). The connection is the Field's with its control, with one value more upward, drawnFocused (SEL-63, FLD-13), the same value the combobox says; the element takes no part in it. Parts and tokens of its own: none. The element writes no custom property: --tanrei-comp-field-*, --tanrei-comp-input-box-* and --tanrei-comp-select-* reach the members by inheritance, and one select field is set apart by setting any of them on the element. What its twin cannot do that it does: nothing. The twin: <tanrei-field label="Country" required supporting-text="Where your invoices are addressed."><tanrei-select name="country" value="jp"><tanrei-option value="jp">Japan</tanrei-option></tanrei-select></tanrei-field>. Before the element is defined its options are running text in the page, as a select's are: hide tanrei-select-field:not(:defined) > * and reserve the block size. Words: none of its own; required-text and optional-text left empty are read by the Field from the product's words.	TanreiSelectField("Country", selection: $country, supportingText: "…") { TanreiSelectOption("Japan").tag("jp") … }: a view whose body is TanreiField(…) { TanreiSelect(selection:) { options } } with each argument passed to the member it is from, and nothing else. The option content is the select's own, passed through as a view builder. labelHidden follows .labelsHidden() and disabled follows .disabled(_:), both read by the Field. The product's words are read by the Field from the \.tanreiWords environment value. Not built on this platform yet, nor is the select itself.	TanreiSelectField(value, onValueChange, label, supportingText = …) { TanreiSelectOption("Japan", "jp") … }: a composable that calls TanreiField(…) { TanreiSelect(…) { content() } } with each argument passed to the member it is from, and nothing else; the content lambda is the select's. enabled is the inverse flag and isError keeps Compose's name, both the Field's. The product's words are read by the Field from LocalTanreiWords. Not built on this platform yet, nor is the select itself.	TanreiSelectField(value:, onChanged:, labelText:, helperText:, options: […]): a widget that builds TanreiField(child: TanreiSelect(…)) with each argument passed to the member it is from, and nothing else; labelText, hintText, helperText, errorText and enabled keep InputDecoration's names. TanreiSelectFormField wraps it as a FormField<String> (validator, onSaved, autovalidateMode), which is how a Flutter form takes part, and its errorText is the Field's. The product's words are read by the Field from the TanreiWords inherited widget. Not built on this platform yet, nor is the select itself.	<SelectField label="Country" value={value} onValueChange={setValue} supportingText="…" options={[…]} />: a component that renders <Field …><Select … /></Field> with each prop passed to the member it is from, and nothing else; options is the select's array. The product's words are read by the Field from the TanreiWordsProvider context. Not built on this platform yet, nor is the select itself.

トークン

トークン	参照先	解決値（ライト）
--tanrei-comp-field-counter-gap	sys.space.space200	16px
--tanrei-comp-field-error-text-gap	sys.space.space50	4px
--tanrei-comp-field-error-text-placement	—	0
--tanrei-comp-field-label-icon-gap	sys.space.space100	8px
--tanrei-comp-field-label-icon-size	sys.icon.small	20px
--tanrei-comp-field-label-gap	sys.space.space100	8px
--tanrei-comp-field-motion-state-duration	sys.motion.role.state.default	250ms
--tanrei-comp-field-motion-state-easing	sys.motion.easing.state	cubic-bezier(0.2, 0, 0, 1)
--tanrei-comp-field-requirement-asterisk-gap	sys.space.space25	2px
--tanrei-comp-field-requirement-gap	sys.space.space100	8px
--tanrei-comp-field-requirement-mark	sys.behavior.requirement-mark	0
--tanrei-comp-field-standard-counter-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-disabled-counter-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-text-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-counter-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-label-icon-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-label-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-required-asterisk-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-supporting-text-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-error-value-text-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-label-icon-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-label-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-required-asterisk-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-supporting-text-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-disabled-value-text-color	—	#1b1b1b · 38%
--tanrei-comp-field-standard-error-text-color	sys.color.error	#cd262f
--tanrei-comp-field-standard-error-counter-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-error-label-icon-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-error-label-color	sys.color.on-surface	#1b1b1b
--tanrei-comp-field-standard-error-required-asterisk-color	sys.color.primary	#1b1b1b
--tanrei-comp-field-standard-error-supporting-text-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-error-value-text-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-focused-counter-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-error-text-color	—	#cd262f
--tanrei-comp-field-standard-focused-error-counter-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-error-label-icon-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-error-label-color	—	#1b1b1b
--tanrei-comp-field-standard-focused-error-required-asterisk-color	—	#1b1b1b
--tanrei-comp-field-standard-focused-error-supporting-text-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-error-value-text-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-label-icon-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-label-color	—	#1b1b1b
--tanrei-comp-field-standard-focused-required-asterisk-color	—	#1b1b1b
--tanrei-comp-field-standard-focused-supporting-text-color	—	#4b4b4b
--tanrei-comp-field-standard-focused-value-text-color	—	#4b4b4b
--tanrei-comp-field-standard-label-icon-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-label-color	sys.color.on-surface	#1b1b1b
--tanrei-comp-field-standard-required-asterisk-color	sys.color.primary	#1b1b1b
--tanrei-comp-field-standard-supporting-text-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-standard-value-text-color	sys.color.on-surface-variant	#4b4b4b
--tanrei-comp-field-supporting-text-gap	sys.space.space50	4px
--tanrei-comp-field-value-text-gap	sys.space.space200	16px
--tanrei-comp-field-label-typescale	sys.typescale.label	500 14px/1.4286
--tanrei-comp-field-supporting-text-typescale	sys.typescale.label-small	500 12px/1.3333
--tanrei-comp-field-value-text-typescale	sys.typescale.label	500 14px/1.4286

フィクスチャ

基準となる描画パターンです。全プラットフォームが同じ ID でスナップショットを撮り、結果を比較できるようにしています。

variant: stacked (41)

stacked-empty

variant: stacked label: Country items: 5

stacked-value

variant: stacked value: jp label: Country items: 5

stacked-open

variant: stacked value: jp label: Country open: true items: 5 312 × 472 のウィンドウに単独で描画

stacked-large

variant: stacked size: large value: jp label: Country items: 5

stacked-small

variant: stacked size: small value: jp label: Country items: 5

stacked-error

variant: stacked label: Country errorText: Choose a country. error: true items: 5

stacked-disabled

variant: stacked value: jp label: Country disabled: true items: 5

stacked-placeholder

label: Country placeholder: Choose a country items: 5

stacked-open-none-chosen

label: Country placeholder: Choose a country open: true items: 5 312 × 473 のウィンドウに単独で描画

stacked-label-hidden

value: fr label: Country labelHidden: true items: 5

stacked-supporting

value: jp label: Country supportingText: Where your invoices are addressed. items: 5

stacked-error-value

value: ke label: Country errorText: We cannot ship there yet. error: true items: 5

stacked-read-only

value: jp label: Country readOnly: true items: 5

stacked-required

label: Country required: true requiredText: Required items: 5

stacked-optional

label: Country placeholder: Choose a country optional: true optionalText: Optional items: 5

stacked-required-asterisk

label: Country required: true requiredMark: asterisk items: 5

stacked-required-disabled

value: jp label: Country disabled: true required: true requiredText: Required items: 5

stacked-required-error

label: Country errorText: Choose a country. error: true required: true requiredText: Required items: 5

stacked-required-ja

label: 国 placeholder: 国を選択 required: true requiredText: 必須 items: 3

stacked-optional-ja

value: jp label: 国 optional: true optionalText: 任意 items: 3

stacked-label-icon

value: Asia/Tokyo label: Time zone items: 3 slots: label-icon

stacked-option-icon

value: dark label: Theme items: 3

stacked-leading-icon

value: ja label: Language items: 2 slots: leading-icon

open-icons

value: dark label: Theme open: true items: 3 312 × 473 のウィンドウに単独で描画

open-supporting-text

value: team label: Plan open: true items: 3 312 × 473 のウィンドウに単独で描画

open-disabled-chosen

value: enterprise label: Plan open: true items: 3 312 × 473 のウィンドウに単独で描画

open-groups

value: Europe/Lisbon label: Time zone open: true items: 3 312 × 473 のウィンドウに単独で描画

open-groups-divider

value: Europe/Lisbon label: Time zone open: true separation: divider items: 3 312 × 473 のウィンドウに単独で描画

open-groups-gap

value: Europe/Lisbon label: Time zone open: true separation: gap items: 3 312 × 473 のウィンドウに単独で描画

open-many

value: corner.small label: Token open: true items: 24 312 × 473 のウィンドウに単独で描画

open-long-options

value: weekly label: Email me open: true items: 3 312 × 473 のウィンドウに単独で描画

long-value

value: all label: Email me items: 3

empty-value-option

value: label: Contrast items: 3

small-label-hidden

size: small value: high label: Contrast labelHidden: true items: 3

small-label-hidden-icons

size: small value: light label: Theme labelHidden: true items: 3

small-label-hidden-leading-icon

size: small value: en label: Language labelHidden: true items: 2 slots: leading-icon

small-label-hidden-open

size: small value: light label: Theme labelHidden: true open: true items: 3 312 × 473 のウィンドウに単独で描画

small-open

size: small value: jp label: Country open: true items: 5 312 × 473 のウィンドウに単独で描画

stacked-required-rtl

value: Asia/Tokyo label: المنطقة الزمنية supportingText: تُعرض المواعيد بهذا التوقيت. required: true requiredText: مطلوب direction: rtl items: 2 slots: label-icon

open-rtl

value: Asia/Tokyo label: المنطقة الزمنية open: true direction: rtl items: 2 312 × 473 のウィンドウに単独で描画

long-value-rtl

value: all label: Email me direction: rtl items: 3

variant: filled (7)

filled-empty

variant: filled label: Country items: 5

filled-value

variant: filled value: jp label: Country items: 5

filled-open

variant: filled value: jp label: Country open: true items: 5 312 × 473 のウィンドウに単独で描画

filled-large

variant: filled size: large value: jp label: Country items: 5

filled-small

variant: filled size: small value: jp label: Country items: 5

filled-error

variant: filled label: Country errorText: Choose a country. error: true items: 5

filled-disabled

variant: filled value: jp label: Country disabled: true items: 5

variant: outlined (9)

outlined-empty

variant: outlined label: Country items: 5

outlined-value

variant: outlined value: jp label: Country items: 5

outlined-open

variant: outlined value: jp label: Country open: true items: 5 312 × 473 のウィンドウに単独で描画

outlined-large

variant: outlined size: large value: jp label: Country items: 5

outlined-small

variant: outlined size: small value: jp label: Country items: 5

outlined-error

variant: outlined label: Country errorText: Choose a country. error: true items: 5

outlined-disabled

variant: outlined value: jp label: Country disabled: true items: 5

outlined-required

variant: outlined label: Country required: true requiredText: Required items: 5

outlined-rtl

variant: outlined value: Europe/Lisbon label: المنطقة الزمنية direction: rtl items: 2

生成元 specs/select-field.spec.json, tokens/comp/field.tokens.json, design/tokens/

Web での描き方の違い

link

• 要素のシャドウルートにあるのは、<tanrei-select> を入れた <tanrei-field> だけです。要素をインポートすると、2 つとも定義されます。
• オプションは、<tanrei-select-field> の子のままです。移動も複製もされません。スロットを通して中のセレクトに届き、変わるたびにセレクトが読み直します。replaceChildren() で入れ替えても、セレクトのときと同じように動きます。
• 要素はフォームに関連付けられます。name と form を受け取り、値だけを送信します（無効の間は何も送信せず、読み取り専用の間は送信します）。リセットすると value 属性の値に戻り、無効な <fieldset> に従い、required が設定されていて値が空の間は、値がないことを報告します。2 つの構成要素がフォームに項目を加えることはありません。
• change は、composed でバブルする、セレクトのイベントです。toggle は、detail.open と detail.reason を持つ、セレクトの CustomEvent です。composed ですがバブルしないので、この要素では受け取れますが、<details> のような祖先には届きません。イベントのターゲットはこの要素で、どのリスナーでも event.target.value と event.target.open は新しい値です。
• パーツ: field と select が 2 つの構成要素です。構成要素のパーツは、1 つ下の階層と同じ名前です。label-icon、supporting-text と、container、outline、active-indicator、value、placeholder、leading-icon、chevron、list、option、option-label、option-supporting-text、option-leading-icon、mark、group、group-title、divider、status です。label と requirement-label は、2 つのうち描かれているほう（フィールドの行か、セレクトの浮き上がるラベル）を指します。field-label、select-label、field-requirement-label、select-requirement-label は、どちらか一方だけを指します。
• 要素そのものはフォーカスを受け取りません。focus() はトリガーに移り、ページの <label for> もフォーカスをトリガーに移します。ラベルの行を押すと、トリガーにフォーカスが移るだけで、何も開きません。トリガーを押すとリストが開き、補足を押しても何も起こりません。
• 要素にロールはありません。名前は label で付けます。ラベルが別の場所に描かれているときは label-hidden を併せて指定します。aria-label はここでは何にも名前を付けないので、使いません。
• 属性は構成要素のものと同じです。label-hidden、supporting-text、error-text、required-mark、required-text、optional-text、readonly です。
• オプションでも、オプションのグループでも、label-icon や leading-icon に入れるグリフでもない子は、描かれません。デバッグビルドはそのことを伝えます。
• 要素が定義されるまでの間、オプションはふつうのテキストとして表示されます。tanrei-select-field:not(:defined) > * を隠し、高さを確保しておいてください。スクリプトなしで動く必要があるページでは、<label> を付けた素の <select> を使います。

ガイドライン

link

推奨

link

• ラベルには、何を選ぶのかを書き、フォームの中では見える状態にしておきます。
• オプションは、ユーザーが探す順に並べます。五十音順やアルファベット順、数の順、またはよく選ばれるものを先にした順です。
• 長いリストはグループに分け、それぞれに短いタイトルを付けます。
• あらかじめ値を選んでおくのは、ほとんどの人がその値を選ぶ場合だけにします。
• フィールドの幅は、置く場所（フォームの列）で決めます。ボックスはその幅いっぱいに広がります。

非推奨

link

• バーやツールバーで、labelHidden を付けたセレクトフィールドを使わない。それは、自身の label で名前を付けた単独のセレクトです。
• プレースホルダーをラベルの代わりにしない。何かを選ぶと消えてしまいます。
• 断りなく、change でページの移動、送信、削除をしない。ユーザーは、読むためにリストの中を移動します。
• セレクトフィールドをフィールドの中に入れない。すでにフィールドです。デバッグビルドがそのことを伝えます。フィールドが囲むコントロールは、セレクトです。
• aria-label で名前を付けない。ラベルを描かないときは、label と labelHidden を指定します。

アクセシビリティ

link

ロール

combobox

ラベル付け

The select field adds nothing to what its members expose and coordinates nothing: the Field gives the select its name, its description and its required, invalid and disabled states (FLD-8, FLD-10, FLD-11, FLD-14), and the select carries them on its own trigger and names its list by the same name (SEL-11, SEL-48). Assistive technology meets one control that opens a list of choices, named by label, with the chosen option's label as its value — exactly as it meets a Field around a select written by hand.

最小ターゲット

見た目のサイズが小さくても、ヒット領域は最小ターゲットサイズを満たします。 minimum 32px · pointer 44px · spacing 8px · touch 48px

キーボード操作

キー	動作
Every key	The select's (its accessibility block; SEL-23, SEL-27, SEL-28, SEL-31, SEL-33, SEL-34). The select field handles no key and adds no focus stop (SEF-3).

備考

• One level down is the same thing: a Field with a select in it, holding the same options. Every fixture has that pair as its twin, and the accessibility tree of the two is the same (SEF-1).
• On the web the two members stand in the select field's own shadow root, so the form meets the select field and not the select (SEF-2), focus passes through to the trigger (SEF-3), and the options, which stay the product's children, reach the select through a slot and are read by it as data.
• A select with no visible label of its own — in a header, a toolbar, a column of a table — is the bare select, named by its own label, not a select field with labelHidden.

生成元 specs/select-field.spec.json, tokens/sys/measure.tokens.json

コンポーネントが担うこと

link

• 1 つの、編集できないコンボボックスです。これはセレクトのものです。名前は label で、描かれていてもいなくても変わりません。説明は、表示している補足テキストまたはエラーテキストで、フィールドが任意の間は任意であることを伝えるテキストも加わります。
• error が true の間は invalid であることを、required が設定されている間は必須であることを、disabled が true の間は無効であることを、readOnly が true の間は読み取り専用であることを、リストが開いている間は展開されていることを伝えます。
• 名前、説明、状態は、フィールドが囲んだコントロールに結び付けるのとまったく同じ方法で結び付けられます。1 つ下の階層で自分で書いたフィールドも、同じコントロールになります。
• 描かれたラベル、必須・任意の印、グリフが、もう一度伝わることはありません。
• Tab キーで止まる位置は 1 つです。ラベルを押すとトリガーにフォーカスが移り、何も開きません。補足を押しても何も起こりません。
• セレクトフィールドの中にフォーカスがある間に現れたエラーは、構成要素のフィールドが 1 度だけ、控えめに読み上げます。
• リストの中のこと（アクティブなオプション、オプションの名前と説明と状態、グループ）は、すべてセレクトのものです。セレクトのページにあります。
• 文字の方向、拡大したテキスト、強制カラーモードへの対応は、それぞれの構成要素が受け持ちます。
• 自分の言葉は持ちません。requiredText と optionalText が空のときは、フィールドがプロダクトの言葉から読みます。

Web での既知の制約は、構成要素のものです。グループの間の区切り線はセパレーターとしては伝わりません。入力した文字とラベルは JavaScript のやり方で比べます。要素が定義されるまでの間は、テキストとしてのオプションのほかに何も描かれません。

利用者側で行うこと

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• すべてのセレクトフィールドに label を、すべてのオプションにラベルを付けます。
• 値は利用者側で検証して error を設定し、どう直せばよいかが分かる errorText を書きます。
• 必須・任意の言葉を渡します。required-text と optional-text をセレクトフィールドに書くか、setWords({ requiredText, optionalText }) でプロダクト全体に一度だけ渡します。Tanrei は言葉を同梱しません。requiredText がなければタグの位置にアスタリスクを描き、optionalText がなければタグを描かず、何も伝えません。プロダクトの言葉を参照してください。
• オプションの値は、1 つのセレクトフィールドの中で重複させません。