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バージョン: v7

ion-radio

shadow

Radios should be used inside of a radio group. Pressing a radio will check it and uncheck the previously selected radio, if there is one. They can also be checked programmatically by setting the value property of the parent radio group to the value of the radio.

When radios are inside of a radio group, only one radio will be checked at any time. If more than one item should be selected, checkboxes should be used instead. Radios can be disabled within a group to prevent interaction with them.

Basic Usage

Label Placement

Developers can use the labelPlacement property to control how the label is placed relative to the control. This property mirrors the flexbox flex-direction property.

Alignment

Developers can use the alignment property to control how the label and control are aligned on the cross axis. This property mirrors the flexbox align-items property.

注記

Stacked radios can be aligned using the alignment property. This can be useful when the label and control need to be centered horizontally.

Justification

Developers can use the justify property to control how the label and control are packed on a line. This property mirrors the flexbox justify-content property.

注記

ion-item is only used in the demos to emphasize how justify works. It is not needed in order for justify to function correctly.

Deselecting Radios

By default, once a radio is selected it cannot be deselected; pressing it again will keep it selected. This behavior can be modified by using the allowEmptySelection property on the parent radio group, which enables the radios to be deselected.

Theming

Colors

CSS Custom Properties

CSS Shadow Parts

Migrating from Legacy Radio Syntax

A simpler radio syntax was introduced in Ionic 7.0. This new syntax reduces the boilerplate required to setup an radio, resolves accessibility issues, and improves the developer experience.

Developers can perform this migration one radio at a time. While developers can continue using the legacy syntax, we recommend migrating as soon as possible.

Using the Modern Syntax

Using the modern syntax involves removing the ion-label and passing the label directly inside of ion-radio. The placement of the label can be configured using the labelPlacement property on ion-radio. The way the label and the control are packed on a line can be controlled using the justify property on ion-radio.

<!-- Basic -->

<!-- Before -->
<ion-item>
<ion-label>Radio Label</ion-label>
<ion-radio></ion-radio>
</ion-item>

<!-- After -->
<ion-item>
<ion-radio>Radio Label</ion-radio>
</ion-item>

<!-- Fixed Labels -->

<!-- Before -->
<ion-item>
<ion-label position="fixed">Radio Label</ion-label>
<ion-radio></ion-radio>
</ion-item>

<!-- After -->
<ion-item>
<ion-radio label-placement="fixed">Radio Label</ion-radio>
</ion-item>

<!-- Radio at the start of line, Label at the end of line -->

<!-- Before -->
<ion-item>
<ion-label slot="end">Radio Label</ion-label>
<ion-radio></ion-radio>
</ion-item>

<!-- After -->
<ion-item>
<ion-radio label-placement="end">Radio Label</ion-radio>
</ion-item>
注記

In past versions of Ionic, ion-item was required for ion-radio to function properly. Starting in Ionic 7.0, ion-radio should only be used in an ion-item when the item is placed in an ion-list. Additionally, ion-item is no longer required for ion-radio to function properly.

Using the Legacy Syntax

Ionic uses heuristics to detect if an app is using the modern radio syntax. In some instances, it may be preferable to continue using the legacy syntax. Developers can set the legacy property on ion-radio to true to force that instance of the radio to use the legacy syntax.

Properties

alignment

DescriptionHow to control the alignment of the radio and label on the cross axis. "start": The label and control will appear on the left of the cross axis in LTR, and on the right side in RTL. "center": The label and control will appear at the center of the cross axis in both LTR and RTL.
Attributealignment
Type"center" | "start"
Default'center'

color

DescriptionThe color to use from your application's color palette. Default options are: "primary", "secondary", "tertiary", "success", "warning", "danger", "light", "medium", and "dark". For more information on colors, see theming.
Attributecolor
Type"danger" | "dark" | "light" | "medium" | "primary" | "secondary" | "success" | "tertiary" | "warning" | string | undefined
Defaultundefined

disabled

DescriptionIf true, the user cannot interact with the radio.
Attributedisabled
Typeboolean
Defaultfalse

justify

DescriptionHow to pack the label and radio within a line. "start": The label and radio will appear on the left in LTR and on the right in RTL. "end": The label and radio will appear on the right in LTR and on the left in RTL. "space-between": The label and radio will appear on opposite ends of the line with space between the two elements.
Attributejustify
Type"end" | "space-between" | "start"
Default'space-between'

labelPlacement

DescriptionWhere to place the label relative to the radio. "start": The label will appear to the left of the radio in LTR and to the right in RTL. "end": The label will appear to the right of the radio in LTR and to the left in RTL. "fixed": The label has the same behavior as "start" except it also has a fixed width. Long text will be truncated with ellipses ("..."). "stacked": The label will appear above the radio regardless of the direction. The alignment of the label can be controlled with the alignment property.
Attributelabel-placement
Type"end" | "fixed" | "stacked" | "start"
Default'start'

legacy

DescriptionSet the legacy property to true to forcibly use the legacy form control markup. Ionic will only opt components in to the modern form markup when they are using either the aria-label attribute or the default slot that contains the label text. As a result, the legacy property should only be used as an escape hatch when you want to avoid this automatic opt-in behavior. Note that this property will be removed in an upcoming major release of Ionic, and all form components will be opted-in to using the modern form markup.
Attributelegacy
Typeboolean | undefined
Defaultundefined

mode

DescriptionThe mode determines which platform styles to use.
Attributemode
Type"ios" | "md"
Defaultundefined

name

DescriptionThe name of the control, which is submitted with the form data.
Attributename
Typestring
Defaultthis.inputId

value

Descriptionthe value of the radio.
Attributevalue
Typeany
Defaultundefined

Events

NameDescription
ionBlurEmitted when the radio button loses focus.
ionFocusEmitted when the radio button has focus.

Methods

No public methods available for this component.

CSS Shadow Parts

NameDescription
containerThe container for the radio mark.
labelThe label text describing the radio.
markThe checkmark or dot used to indicate the checked state.

CSS Custom Properties

NameDescription
--border-radiusBorder radius of the radio
--colorColor of the radio
--color-checkedColor of the checked radio
--inner-border-radiusBorder radius of the inner checked radio

Slots

NameDescription
``The label text to associate with the radio. Use the "labelPlacement" property to control where the label is placed relative to the radio.