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50 lines
1.4 KiB
50 lines
1.4 KiB
---
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title: Slot props
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---
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In this app, we have a `<Hoverable>` component that tracks whether the mouse is currently over it. It needs to pass that data _back_ to the parent component, so that we can update the slotted contents.
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For this, we use _slot props_. In `Hoverable.svelte`, pass the `hovering` value into the slot:
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<!-- prettier-ignore -->
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```svelte
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<div on:mouseenter={enter} on:mouseleave={leave}>
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<slot hovering={hovering} />
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</div>
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```
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> Remember you can also use the `{hovering}` shorthand, if you prefer.
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Then, to expose `hovering` to the contents of the `<Hoverable>` component, we use the `let` directive:
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<!-- prettier-ignore -->
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```svelte
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<Hoverable let:hovering={hovering}>
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<div class:active={hovering}>
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{#if hovering}
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<p>I am being hovered upon.</p>
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{:else}
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<p>Hover over me!</p>
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{/if}
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</div>
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</Hoverable>
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```
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You can rename the variable, if you want — let's call it `active` in the parent component:
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```svelte
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<Hoverable let:hovering={active}>
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<div class:active>
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{#if active}
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<p>I am being hovered upon.</p>
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{:else}
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<p>Hover over me!</p>
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{/if}
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</div>
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</Hoverable>
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```
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You can have as many of these components as you like, and the slotted props will remain local to the component where they're declared.
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> Named slots can also have props; use the `let` directive on an element with a `slot="..."` attribute, instead of on the component itself.
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