ion-fab
Fabs are container elements that contain one or more fab buttons. They should be placed in a fixed position that does not scroll with the content. Fabs should have one main fab button. Fabs can also contain one or more fab lists which contain related buttons that show when the main fab button is clicked.
Basic Usage
List Side
The side property of the fab list component controls where it appears relative to the main fab button. A single fab can have multiple fab lists as long as they all have different values for side.
Positioning
In order to place the fab in a fixed position, it should be assigned to the fixed slot of the outer content component. Use the vertical and horizontal props to control the alignment of the fab in the viewport. The edge prop will cause the fab button to overlap with the app's header or footer.
Safe Area
If there is no ion-header or ion-footer component, the fab may be covered by a device's notch, status bar, or other device UI. In these cases, the safe area on the top and bottom is not taken into account. This can be adjusted by using the --ion-safe-area-(dir) variables.
When using a fab with vertical set to "top" without an ion-header, the top margin needs to be set:
ion-fab {
margin-top: var(--ion-safe-area-top, 0);
}
And when using a fab with vertical set to "bottom" without an ion-footer, the bottom margin needs to be set:
ion-fab {
margin-bottom: var(--ion-safe-area-bottom, 0);
}
If there is an ion-header (for a fab with vertical set to "top") or ion-footer (for a fab with vertical set to "bottom"), no CSS adjustment is needed because the fab gets positioned relative to the header or footer.
Relative to Infinite List
In scenarios where a view contains many interactive elements, such as an infinitely-scrolling list, it may be challenging for users to navigate to the Floating Action Button (FAB) if it is placed below all the items in the DOM.
By setting the fixedSlotPlacement property on Content to before, the FAB will be placed before the main content in the DOM. This ensures that the FAB receives keyboard focus before other interactive elements receive focus, making it easier for users to access the FAB.
Button Sizing
Setting the size property of the main fab button to "small" will render it at a mini size. Note that this property will not have an effect when used with the inner fab buttons.
Theming
Colors
CSS Custom Properties
CSS Shadow Parts
Accessibility
Labels
Since FABs are allowed to contain only icons, developers must provide an aria-label on each ion-fab-button instance. Without this label, assistive technologies will not be able to announce the purpose of each button.
Properties
activated
| Description | もし true ならば、ion-fab 内の ion-fab-button とすべての ion-fab-list の両方がアクティブになる。つまり、ion-fab-buttonはcloseアイコンになり、ion-fab-listは可視化される。 |
| Attribute | activated |
| Type | boolean |
| Default | false |
edge
| Description | trueの場合、verticalが"top"の場合はヘッダーの端に、"bottom"の場合はフッターの端にファブを表示します。 fixed slotと一緒に使用する必要があります。 |
| Attribute | edge |
| Type | boolean |
| Default | false |
horizontal
| Description | ビューポートでファブを水平に揃える場所。 |
| Attribute | horizontal |
| Type | "center" ｜ "end" ｜ "start" ｜ undefined |
| Default | undefined |
vertical
| Description | ビューポートでファブを縦に並べる場所。 |
| Attribute | vertical |
| Type | "bottom" ｜ "center" ｜ "top" ｜ undefined |
| Default | undefined |
Events
No events available for this component.
Methods
close
| Description | アクティブなFABリストコンテナを閉じる。 |
| Signature | close() => Promise<void> |
CSS Shadow Parts
No CSS shadow parts available for this component.
CSS Custom Properties
No CSS custom properties available for this component.
Slots
No slots available for this component.