shoelace/docs/pages/components/split-panel.md

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---
meta:
title: Split Panel
description: Split panels display two adjacent panels, allowing the user to reposition them.
layout: component
---
```html:preview
<sl-split-panel>
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel>
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
## Examples
### Initial Position
To set the initial position, use the `position` attribute. If no position is provided, it will default to 50% of the available space.
```html:preview
<sl-split-panel position="75">
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
### Initial Position in Pixels
To set the initial position in pixels instead of a percentage, use the `position-in-pixels` attribute.
```html:preview
<sl-split-panel position-in-pixels="150">
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel position="200">
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
### Vertical
Add the `vertical` attribute to render the split panel in a vertical orientation where the start and end panels are stacked. You also need to set a height when using the vertical orientation.
```html:preview
<sl-split-panel vertical style="height: 400px;">
<div
slot="start"
style="height: 100%; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 100%; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel vertical style={{ height: '400px' }}>
<div
slot="start"
style={{
height: '100%',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '100%',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
### Snapping
To snap panels at specific positions while dragging, add the `snap` attribute with one or more space-separated values. Values must be in pixels or percentages. For example, to snap the panel at `100px` and `50%`, use `snap="100px 50%"`. You can also customize how close the divider must be before snapping with the `snap-threshold` attribute.
```html:preview
<div class="split-panel-snapping">
<sl-split-panel snap="100px 50%">
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
<div class="split-panel-snapping-dots"></div>
</div>
<style>
.split-panel-snapping {
position: relative;
}
.split-panel-snapping-dots::before,
.split-panel-snapping-dots::after {
content: '';
position: absolute;
bottom: -12px;
width: 6px;
height: 6px;
border-radius: 50%;
background: var(--sl-color-neutral-400);
transform: translateX(-3px);
}
.split-panel-snapping-dots::before {
left: 100px;
}
.split-panel-snapping-dots::after {
left: 50%;
}
</style>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const css = `
.split-panel-snapping {
position: relative;
}
.split-panel-snapping-dots::before,
.split-panel-snapping-dots::after {
content: '';
position: absolute;
bottom: -12px;
width: 6px;
height: 6px;
border-radius: 50%;
background: var(--sl-color-neutral-400);
transform: translateX(-3px);
}
.split-panel-snapping-dots::before {
left: 100px;
}
.split-panel-snapping-dots::after {
left: 50%;
}
`;
const App = () => (
<>
<div className="split-panel-snapping">
<SlSplitPanel snap="100px 50%">
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
<div className="split-panel-snapping-dots" />
</div>
<style>{css}</style>
</>
);
```
{% endraw %}
### Disabled
Add the `disabled` attribute to prevent the divider from being repositioned.
```html:preview
<sl-split-panel disabled>
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel disabled>
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
### Setting the Primary Panel
By default, both panels will grow or shrink proportionally when the host element is resized. If a primary panel is designated, it will maintain its size and the secondary panel will grow or shrink to fit the remaining space. You can set the primary panel to `start` or `end` using the `primary` attribute.
Try resizing the example below with each option and notice how the panels respond.
```html:preview
<div class="split-panel-primary">
<sl-split-panel>
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
<sl-select label="Primary Panel" value="" style="max-width: 200px; margin-top: 1rem;">
<sl-option value="">None</sl-option>
<sl-option value="start">Start</sl-option>
<sl-option value="end">End</sl-option>
</sl-select>
</div>
<script>
const container = document.querySelector('.split-panel-primary');
const splitPanel = container.querySelector('sl-split-panel');
const select = container.querySelector('sl-select');
select.addEventListener('sl-change', () => (splitPanel.primary = select.value));
</script>
```
{% raw %}
```jsx:react
import { useState } from 'react';
import { SlSplitPanel, SlSelect, SlMenuItem } from '@shoelace-style/shoelace/dist/react';
const App = () => {
const [primary, setPrimary] = useState('');
return (
<>
<SlSplitPanel primary={primary}>
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
<SlSelect
label="Primary Panel"
value={primary}
style={{ maxWidth: '200px', marginTop: '1rem' }}
onSlChange={event => setPrimary(event.target.value)}
>
<SlMenuItem value="">None</SlMenuItem>
<SlMenuItem value="start">Start</SlMenuItem>
<SlMenuItem value="end">End</SlMenuItem>
</SlSelect>
</>
);
};
```
{% endraw %}
### Min & Max
To set a minimum or maximum size of the primary panel, use the `--min` and `--max` custom properties. Since the secondary panel is flexible, size constraints can only be applied to the primary panel. If no primary panel is designated, these constraints will be applied to the `start` panel.
This examples demonstrates how you can ensure both panels are at least 150px using `--min`, `--max`, and the `calc()` function.
```html:preview
<sl-split-panel style="--min: 150px; --max: calc(100% - 150px);">
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel style={{ '--min': '150px', '--max': 'calc(100% - 150px)' }}>
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
### Nested Split Panels
Create complex layouts that can be repositioned independently by nesting split panels.
```html:preview
<sl-split-panel>
<div
slot="start"
style="height: 400px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div slot="end">
<sl-split-panel vertical style="height: 400px;">
<div
slot="start"
style="height: 100%; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Top
</div>
<div
slot="end"
style="height: 100%; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Bottom
</div>
</sl-split-panel>
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel>
<div
slot="start"
style={{
height: '400px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div slot="end">
<SlSplitPanel vertical style={{ height: '400px' }}>
<div
slot="start"
style={{
height: '100%',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '100%',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
</div>
</SlSplitPanel>
);
```
{% endraw %}
### Customizing the Divider
You can target the `divider` part to apply CSS properties to the divider. To add a custom handle, slot an icon into the `divider` slot. When customizing the divider, make sure to think about focus styles for keyboard users.
```html:preview
<sl-split-panel style="--divider-width: 20px;">
<sl-icon slot="divider" name="grip-vertical"></sl-icon>
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
```
{% raw %}
```jsx:react
import { SlSplitPanel, SlIcon } from '@shoelace-style/shoelace/dist/react';
const App = () => (
<SlSplitPanel style={{ '--divider-width': '20px' }}>
<SlIcon slot="divider" name="grip-vertical" />
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
);
```
{% endraw %}
Here's a more elaborate example that changes the divider's color and width and adds a styled handle.
```html:preview
<div class="split-panel-divider">
<sl-split-panel>
<sl-icon slot="divider" name="grip-vertical"></sl-icon>
<div
slot="start"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
Start
</div>
<div
slot="end"
style="height: 200px; background: var(--sl-color-neutral-50); display: flex; align-items: center; justify-content: center;"
>
End
</div>
</sl-split-panel>
</div>
<style>
.split-panel-divider sl-split-panel {
--divider-width: 2px;
}
.split-panel-divider sl-split-panel::part(divider) {
background-color: var(--sl-color-pink-600);
}
.split-panel-divider sl-icon {
position: absolute;
border-radius: var(--sl-border-radius-small);
background: var(--sl-color-pink-600);
color: var(--sl-color-neutral-0);
padding: 0.5rem 0.125rem;
}
.split-panel-divider sl-split-panel::part(divider):focus-visible {
background-color: var(--sl-color-primary-600);
}
.split-panel-divider sl-split-panel:focus-within sl-icon {
background-color: var(--sl-color-primary-600);
color: var(--sl-color-neutral-0);
}
</style>
```
{% raw %}
```jsx:react
import { SlSplitPanel, SlIcon } from '@shoelace-style/shoelace/dist/react';
const css = `
.split-panel-divider sl-split-panel {
--divider-width: 2px;
}
.split-panel-divider sl-split-panel::part(divider) {
background-color: var(--sl-color-pink-600);
}
.split-panel-divider sl-icon {
position: absolute;
border-radius: var(--sl-border-radius-small);
background: var(--sl-color-pink-600);
color: var(--sl-color-neutral-0);
padding: .5rem .125rem;
}
.split-panel-divider sl-split-panel::part(divider):focus-visible {
background-color: var(--sl-color-primary-600);
}
.split-panel-divider sl-split-panel:focus-within sl-icon {
background-color: var(--sl-color-primary-600);
color: var(--sl-color-neutral-0);
}
`;
const App = () => (
<>
<div className="split-panel-divider">
<SlSplitPanel>
<SlIcon slot="divider" name="grip-vertical" />
<div
slot="start"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
Start
</div>
<div
slot="end"
style={{
height: '200px',
background: 'var(--sl-color-neutral-50)',
display: 'flex',
alignItems: 'center',
justifyContent: 'center'
}}
>
End
</div>
</SlSplitPanel>
</div>
<style>{css}</style>
</>
);
```
{% endraw %}