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123 lines
3.0 KiB
Markdown
123 lines
3.0 KiB
Markdown
---
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title: v-slot Can Only Be Used on Components or Template Tags
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impact: HIGH
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impactDescription: Using v-slot on HTML elements causes compilation errors
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type: gotcha
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tags: [vue3, slots, v-slot, compilation-error, common-mistake]
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---
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# v-slot Can Only Be Used on Components or Template Tags
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**Impact: HIGH** - The `v-slot` directive (and its shorthand `#`) can only be used on Vue components or `<template>` tags. Using it on native HTML elements like `<div>` or `<span>` causes a Vue compilation error.
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## Task Checklist
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- [ ] Only use `v-slot` on component elements or `<template>` tags
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- [ ] When using default scoped slot shorthand, apply to the component itself
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- [ ] For named slots, always use `<template #name>` syntax
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**Incorrect:**
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```vue
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<template>
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<!-- BAD: v-slot on a native HTML element -->
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<div v-slot:header>
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<h1>Title</h1>
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</div>
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<!-- BAD: Shorthand on HTML element -->
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<span #default="{ item }">
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{{ item.name }}
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</span>
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<!-- BAD: v-slot inside a plain HTML element -->
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<div>
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<p v-slot:content>Some text</p>
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</div>
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</template>
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```
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These cause the error: `v-slot can only be used on components or <template> tags`
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**Correct:**
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```vue
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<template>
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<!-- GOOD: v-slot on component element (default scoped slot) -->
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<MyComponent v-slot="{ item }">
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{{ item.name }}
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</MyComponent>
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<!-- GOOD: Named slots use template tags -->
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<BaseLayout>
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<template #header>
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<h1>Title</h1>
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</template>
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<template #default>
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<p>Main content</p>
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</template>
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<template #footer>
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<p>Footer content</p>
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</template>
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</BaseLayout>
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<!-- GOOD: Shorthand on component for default slot -->
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<FancyList #default="{ item }">
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<div>{{ item.name }}</div>
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</FancyList>
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</template>
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```
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## Common Scenarios
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### Wrapping Slot Content in HTML
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If you need HTML wrappers around slot content, put them inside the template:
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```vue
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<!-- WRONG -->
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<MyComponent>
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<div v-slot:header class="header-wrapper">
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<h1>Title</h1>
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</div>
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</MyComponent>
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<!-- CORRECT -->
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<MyComponent>
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<template #header>
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<div class="header-wrapper">
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<h1>Title</h1>
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</div>
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</template>
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</MyComponent>
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```
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### Multiple v-slot on Same Element
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Another error occurs when you have multiple v-slot directives - only the first is recognized:
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```vue
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<!-- BAD: Multiple v-slot directives -->
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<MyComponent v-slot:header v-slot:footer>
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Content
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</MyComponent>
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<!-- GOOD: Separate template for each slot -->
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<MyComponent>
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<template #header>Header</template>
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<template #footer>Footer</template>
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</MyComponent>
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```
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## Valid v-slot Locations
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| Element Type | v-slot Allowed? | Example |
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|--------------|-----------------|---------|
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| Component | Yes | `<MyComponent v-slot="props">` |
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| `<template>` | Yes | `<template #header>` |
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| `<div>` | No | Compilation error |
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| `<span>` | No | Compilation error |
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| Any HTML element | No | Compilation error |
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## Reference
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- [Vue.js Slots](https://vuejs.org/guide/components/slots.html)
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- [DeepScan - vue-misused-v-slot](https://deepscan.io/docs/rules/vue-misused-v-slot)
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