Campo de selección

Descripción general

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

Variantes que no se incluyen en

tanrei: filled, outlined

Generado a partir de docs/status/status.json, specs/select-field.spec.json

Un campo de selección obligatorio, y otro agrupado con un glifo que representa al campo

CanadáFranciaJapónKeniaNueva ZelandapublicTokioSeúlLisboaBerlín

Usa un campo de selección en un formulario para elegir un valor de una lista conocida y cerrada: un país, una zona horaria, un plan. Es el caso corriente, listo para usarse: una etiqueta, la caja que muestra la opción elegida y abre la lista, una línea de ayuda y las palabras para un valor que se rechazó.

Se compone de un campo y un select. El campo es el marco: la etiqueta, la marca de obligatorio o de opcional, la ayuda y el error. El select es el control: el activador, la lista y todo lo que la persona hace en ellos. El campo de selección no dibuja nada propio y no tiene ningún token: cada propiedad que tiene es una propiedad de uno de los dos, que recibe sin cambios, y las opciones que le das son las de su select.

Es tan ancho como el lugar en el que se pone, y su caja lo llena. Para una caja más estrecha, dale un lugar más estrecho.

En la web es <tanrei-select-field>, con elementos <tanrei-option> como hijos. Las demás plataformas todavía no lo han implementado.

Uso

link

Las opciones son hijos del campo de selección: cada una tiene un valor y una etiqueta. value dice cuál es la elegida. change y toggle son los eventos del propio select, y cuando se oye cualquiera de los dos, el value y el open del campo ya son los nuevos.

<form>
  <tanrei-select-field name="country" label="País" value="jp" required required-text="Obligatorio"
    supporting-text="El país al que van dirigidas tus facturas.">
    <tanrei-option value="ca">Canadá</tanrei-option>
    <tanrei-option value="jp">Japón</tanrei-option>
  </tanrei-select-field>
</form>

<!-- Agrupado, con una línea debajo de una etiqueta y un glifo que representa al campo. -->
<tanrei-select-field label="Zona horaria" value="Europe/Lisbon">
  <span slot="leading-icon">public</span>
  <tanrei-option-group label="Asia">
    <tanrei-option value="Asia/Tokyo" supporting-text="UTC+9">Tokio</tanrei-option>
  </tanrei-option-group>
  <tanrei-option-group label="Europa">
    <tanrei-option value="Europe/Lisbon" supporting-text="UTC+0">Lisboa</tanrei-option>
  </tanrei-option-group>
</tanrei-select-field>

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

  const country = document.querySelector('[name="country"]');
  // La persona eligió otra opción. El valor ya es el nuevo.
  country.addEventListener('change', () => save(country.value));
  // La persona abrió o cerró la lista; un cierre dice por qué.
  country.addEventListener('toggle', (e) => console.log(e.detail.open, e.detail.reason));
  // La validación es tuya: el campo de selección nunca define error por sí mismo.
  country.error = submitted && !ships(country.value);
  country.errorText = 'Todavía no hacemos envíos a ese país. Elige otro país.';
</script>

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

<SelectField label="País" value={country} required requiredText="Obligatorio" onChange={(event) => setCountry(event.currentTarget.value)}>
  <Option value="ca">Canadá</Option>
  <Option value="jp">Japón</Option>
</SelectField>

Un nivel más abajo

link

El mismo campo, escrito a mano con sus dos miembros, es la misma imagen y el mismo control para la tecnología de apoyo:

<tanrei-field label="País" required required-text="Obligatorio"
  supporting-text="El país al que van dirigidas tus facturas.">
  <tanrei-select name="country" placeholder="Elige un país">
    <tanrei-option value="jp">Japón</tanrei-option>
    <tanrei-option value="ke">Kenia</tanrei-option>
  </tanrei-select>
</tanrei-field>

El mismo campo escrito a mano: un campo con un select dentro

JapónKenia

Baja a ese nivel cuando necesites una organización que el campo de selección no ofrezca:

Necesitas	Usa
Una etiqueta, la caja, ayuda y un error	El campo de selección
Algo tuyo dentro del marco, junto a la caja o debajo de ella	Un campo con un select y tu propio elemento dentro
La caja sin nada más, donde su etiqueta está en otro lugar: un tema en una barra, un criterio de ordenación en una barra de herramientas, una celda de una tabla	El select sin nada más, con su propio label como nombre
Una lista tan larga que las personas prefieren escribir a desplazarse	Un cuadro combinado

Lo que cambia un nivel más abajo es dónde se dicen las cosas. name, value y las opciones están en el select, que es entonces el control que encuentra el formulario, y sus eventos se oyen en él. label, error y disabled se quedan en el campo, que los pasa al control: no definas los del propio select.

Especificaciones

link

Texto de apoyo con una opción deshabilitada, opcional, un error, de solo lectura y deshabilitado

GratisEquipoEmpresaEuropa, Oriente Medio y ÁfricaAsia y el PacíficoJapónKeniaJapónKeniaJapónKenia

Filled y outlined: la etiqueta del campo flota en la caja del select, con un asterisco para un campo obligatorio

JapónKeniaJapónKenia

Con m3-like

Qué aporta cada miembro

link

Aspecto	Del campo	Del select
Propiedades	label, labelHidden, supportingText, errorText, error, disabled, required, optional, requiredMark, requiredText, optionalText	variant, size, value, placeholder, readOnly, open, separation, iconSpace, status, statusText, emptyText
Eventos	—	change, toggle
Slots	label-icon	leading-icon, y las opciones
Tokens	comp.field.*	comp.input-box.* para la caja, que leen todas las cajas de entrada; comp.select.* para la lista

El select tiene un label, un labelHidden, un error y un disabled propios. No son propiedades del campo de selección: el label del campo da nombre al control, su error pone la caja en su estado de error y su disabled la deshabilita. Así, defines cada uno una sola vez, en el campo de selección, y su etiqueta cambia con el control.

En el aspecto stacked, la etiqueta es la fila del campo situada sobre la caja. En los aspectos filled y outlined, el select dibuja él mismo esa etiqueta, flotando en su caja, y el campo no dibuja ninguna fila de etiqueta; un campo obligatorio se marca entonces con un asterisco después de la etiqueta, sea cual sea la marca que indique el sistema de diseño. La ayuda empieza donde empieza el valor, después de un icono inicial. Mientras la lista está abierta, la etiqueta y la ayuda se dibujan con foco, igual que la caja.

Lo que hacen el activador y la lista (abrirse, las teclas de flecha, la escritura, la elección, los grupos) está en la página del select. Lo que hace el marco (la marca de obligatorio, la ayuda, el error y cómo se anuncia) está en la página del campo.

Diferenciar un solo campo

link

El campo de selección no tiene ningún token propio. Su marco lee los tokens del campo, y su caja y su lista leen los del select, se definan donde se definan. Para cambiar una sola instancia, define en ella el token del miembro:

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

Anatomía

Anatomía

Dibujado sobre el fixture stacked-empty, tal como lo dibuja el paquete web.

Parte	Descripción
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.

Propiedades

Propiedad	Tipo	Valor predeterminado	Descripción
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

Slots

Slot	Descripción
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

Eventos

Evento	Descripción
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

Elementos

Los tipos de elemento que el componente repite. Un fixture enumera sus elementos en orden; cada plataforma nombra cada tipo según su propio estilo.

option

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

Propiedad	Tipo	Valor predeterminado	Descripción
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.

Especificación	Web	SwiftUI	Jetpack Compose	Flutter	React Native
Elemento	tanrei-option	TanreiSelectOption	TanreiSelectOption	TanreiSelectOption	SelectOption
label · Propiedad	label	title	text	label	label
value · Propiedad	value	tag	value	value	value
supportingText · Propiedad	supportingText	supportingText	supportingText	supportingText	supportingText
leadingIcon · Propiedad	leadingIcon	leadingIcon	leadingIcon	leadingIcon	leadingIcon
disabled · Propiedad	disabled	disabled	enabled	enabled	disabled
Notas	<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 · grupo: contiene elementos

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

Propiedad	Tipo	Valor predeterminado	Descripción
title	string	""	A short heading drawn above the group's options, which also names the group; empty draws none and leaves the group unnamed.

Especificación	Web	SwiftUI	Jetpack Compose	Flutter	React Native
Elemento	tanrei-option-group	TanreiSelectSection	TanreiSelectGroup	TanreiSelectGroup	SelectOptionGroup
title · Propiedad	label	title	title	title	title
Notas	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.

Estados

Comportamiento

Requisitos en formato EARS. Cada implementación de plataforma se prueba contra estos identificadores. El texto de los requisitos se muestra tal como está en la especificación, en inglés.

ID	Requisito
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.

Correspondencia de nombres por plataforma

Paridad no significa API idénticas. Cada plataforma expresa el mismo contrato con su propio estilo.

Especificación	Web	SwiftUI	Jetpack Compose	Flutter	React Native
Componente	tanrei-select-field	TanreiSelectField	TanreiSelectField	TanreiSelectField	SelectField
variant · Propiedad	variant	variant	variant	variant	variant
size · Propiedad	size	size	size	size	size
value · Propiedad	value	selection	value	value	value
label · Propiedad	label	label	label	labelText	label
labelHidden · Propiedad	labelHidden	labelsHidden	labelHidden	labelHidden	labelHidden
placeholder · Propiedad	placeholder	prompt	placeholder	hintText	placeholder
supportingText · Propiedad	supportingText	supportingText	supportingText	helperText	supportingText
errorText · Propiedad	errorText	errorText	errorText	errorText	errorText
error · Propiedad	error	error	isError	isError	error
disabled · Propiedad	disabled	disabled	enabled	enabled	disabled
readOnly · Propiedad	readOnly	readOnly	readOnly	readOnly	readOnly
required · Propiedad	required	isRequired	required	required	required
optional · Propiedad	optional	isOptional	optional	optional	optional
requiredMark · Propiedad	requiredMark	requiredMark	requiredMark	requiredMark	requiredMark
requiredText · Propiedad	requiredText	requiredText	requiredText	requiredText	requiredText
optionalText · Propiedad	optionalText	optionalText	optionalText	optionalText	optionalText
open · Propiedad	open	isPresented	expanded	controller	open
separation · Propiedad	separation	separation	separation	separation	separation
iconSpace · Propiedad	iconSpace	iconSpace	iconSpace	iconSpace	iconSpace
density · Propiedad	density	density	density	density	density
status · Propiedad	status	status	status	status	status
statusText · Propiedad	statusText	statusText	statusText	statusText	statusText
emptyText · Propiedad	emptyText	emptyText	emptyText	emptyText	emptyText
change · Evento	change	selection	onValueChange	onChanged	onValueChange
toggle · Evento	toggle	isPresented	onExpandedChange	onOpenChanged	onOpenChange
Notas	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.

Tokens

Token	Alias de	Valor resuelto (claro)
--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

Fixtures

Representaciones canónicas. Todas las plataformas capturan cada fixture con el mismo identificador para poder comparar los resultados.

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 Dibujado por separado en una ventana de 312 × 472

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 Dibujado por separado en una ventana de 312 × 473

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 Dibujado por separado en una ventana de 312 × 473

open-supporting-text

value: team label: Plan open: true items: 3 Dibujado por separado en una ventana de 312 × 473

open-disabled-chosen

value: enterprise label: Plan open: true items: 3 Dibujado por separado en una ventana de 312 × 473

open-groups

value: Europe/Lisbon label: Time zone open: true items: 3 Dibujado por separado en una ventana de 312 × 473

open-groups-divider

value: Europe/Lisbon label: Time zone open: true separation: divider items: 3 Dibujado por separado en una ventana de 312 × 473

open-groups-gap

value: Europe/Lisbon label: Time zone open: true separation: gap items: 3 Dibujado por separado en una ventana de 312 × 473

open-many

value: corner.small label: Token open: true items: 24 Dibujado por separado en una ventana de 312 × 473

open-long-options

value: weekly label: Email me open: true items: 3 Dibujado por separado en una ventana de 312 × 473

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 Dibujado por separado en una ventana de 312 × 473

small-open

size: small value: jp label: Country open: true items: 5 Dibujado por separado en una ventana de 312 × 473

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 Dibujado por separado en una ventana de 312 × 473

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 Dibujado por separado en una ventana de 312 × 473

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 Dibujado por separado en una ventana de 312 × 473

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

Generado a partir de specs/select-field.spec.json, tokens/comp/field.tokens.json, design/tokens/

Qué dibuja la web de otra manera

link

• El shadow root del elemento contiene un <tanrei-field> con un <tanrei-select> dentro, y nada más. Importar el elemento define los dos.
• Las opciones siguen siendo tus hijos de <tanrei-select-field>. Nunca se mueven ni se copian: llegan al select de dentro a través de un slot, y el select las vuelve a leer cuando cambian. Sustituirlas a mano (replaceChildren()) funciona como en un select.
• El elemento está asociado a formularios. Recibe name y form, envía solo el valor (nada mientras está deshabilitado, y lo sigue enviando mientras es de solo lectura), se restablece al valor del atributo value, sigue a un <fieldset> deshabilitado y notifica que falta un valor mientras required está activado y el valor está vacío. Sus dos miembros no añaden ninguna entrada al formulario.
• change es el evento del select, compuesto y que se propaga. toggle es el CustomEvent del select, con detail.open y detail.reason: es compuesto y no se propaga, de modo que se oye en el elemento y nunca en un ancestro como un <details>. El destino de los dos es el elemento, y event.target.value y event.target.open son los nuevos en todos los listeners.
• Partes: field y select son los dos miembros. Sus propias partes tienen aquí los mismos nombres que un nivel más abajo: label-icon, supporting-text; 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. label y requirement-label son la que se dibuja de las dos (la fila del campo, o la etiqueta flotante del select), y field-label, select-label, field-requirement-label y select-requirement-label nombran la de un solo miembro.
• El elemento no puede recibir el foco por sí mismo: focus() va al activador, y un <label for> propio de la página lleva el foco allí. Una pulsación en la fila de etiqueta da el foco al activador y no abre nada; una pulsación en el activador abre la lista; una pulsación en la ayuda no hace nada.
• El elemento no tiene rol. Dale nombre con label —con label-hidden donde la etiqueta se dibuja en otro lugar— y nunca con aria-label, que aquí no nombra nada.
• Los atributos son los de los propios miembros: label-hidden, supporting-text, error-text, required-mark, required-text, optional-text, readonly.
• Un hijo que no es una opción, ni un grupo de opciones, ni un glifo para label-icon o leading-icon no se dibuja; una compilación de depuración lo dice.
• Antes de que el elemento esté definido, sus opciones son texto corrido. Oculta tanrei-select-field:not(:defined) > * y reserva la altura. Una página que deba funcionar sin script usa un <select> nativo con su propio <label>.

Pautas

link

Recomendado

link

• Escribe una etiqueta que nombre lo que se elige, y mantenla visible en un formulario.
• Ordena las opciones como las buscan las personas: por orden alfabético, por número o con las más habituales primero.
• Agrupa una lista larga y da a cada grupo un título corto.
• Preselecciona un valor solo donde la mayoría de las personas lo elegiría.
• Da al campo un ancho con el lugar que ocupa: una columna de un formulario. La caja lo llena.

Evita

link

• No uses un campo de selección con labelHidden en una barra o en una barra de herramientas. Eso es el select sin nada más, con su propio label como nombre.
• No uses el marcador de posición como etiqueta. Desaparece en cuanto se elige algo.
• No navegues, envíes ni elimines en change sin decirlo. Las personas recorren una lista para leerla.
• No pongas un campo de selección dentro de un campo. Ya es un campo; una compilación de depuración lo dice. El control que un campo enmarca es el select.
• No le des nombre con aria-label. Donde no deba dibujarse ninguna etiqueta, da label y labelHidden.

Accesibilidad

link

Rol

combobox

Etiquetado

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.

Objetivo mínimo

El área de pulsación cumple el tamaño mínimo de objetivo aunque el tamaño visual sea menor. minimum 32px · pointer 44px · spacing 8px · touch 48px

Teclado

Teclas	Acción
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).

Notas

• 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.

Generado a partir de specs/select-field.spec.json, tokens/sys/measure.tokens.json

De qué se encarga el componente

link

• Es un solo cuadro combinado no editable, el del select. Su nombre es label, se dibuje o no; su descripción es el texto de apoyo o de error que se muestra, con el texto de opcional mientras el campo es opcional.
• Se expone como no válido mientras error es true, como obligatorio mientras required está activado, como deshabilitado mientras disabled es true, como de solo lectura mientras readOnly es true y como expandido mientras su lista está abierta.
• El nombre, la descripción y los estados se vinculan exactamente como un campo los vincula a cualquier control que enmarca. El campo escrito a mano, un nivel más abajo, es el mismo control.
• La etiqueta dibujada, la marca de obligatoriedad y los glifos no se exponen una segunda vez.
• Es una sola parada para la tecla Tab. Una pulsación en la etiqueta lleva el foco al activador y no abre nada; una pulsación en la ayuda no hace nada.
• Un error que aparece mientras el foco está en el campo de selección lo anuncia una vez, de forma cortés, su miembro campo.
• Todo lo que hay en la lista (la opción activa, los nombres, las descripciones y los estados de las opciones, los grupos) es del select, como en la página del select.
• La dirección, el texto ampliado y los colores forzados los resuelve cada miembro por su cuenta.
• No tiene textos propios. requiredText y optionalText, si se dejan vacíos, los lee el campo de los textos del producto.

Las carencias conocidas en la web son las de sus miembros: el divisor entre dos grupos no se expone como separador, la escritura compara las etiquetas como lo hace JavaScript, y antes de que el elemento esté definido no se dibuja nada más que las opciones como texto.

Qué debes hacer tú

link

• Da un label a cada campo de selección, y una etiqueta a cada opción.
• Valida tú el valor, activa error y escribe errorText de modo que diga cómo corregir la respuesta.
• Da las palabras de la obligatoriedad: required-text y optional-text en el campo de selección, o una sola vez para todo el producto con setWords({ requiredText, optionalText }). Tanrei no incluye ninguna: sin requiredText, un asterisco ocupa el lugar del tag, y sin optionalText no se dibuja ningún tag y no se dice nada. Consulta Los textos del producto.
• Mantén únicos los valores de las opciones dentro de un campo de selección.