N
Nuxt•4w ago
Rost

Access the slot data from a markdown component in <script setup>

I am having this component in markdown that has a list of data, I need to do something with it in the script setup tag. How do I do this? 
::component
abc
def
gef
::
::component
abc
def
gef
::
I've tried using the useSlots functions but that only gives me undefined.
14 Replies
kapa.ai
kapa.ai•4w ago
Hi @Rost. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To access slot data from a markdown component in the <script setup> section, you can use the useSlots() composable along with the onMounted() lifecycle hook. However, it's important to note that the slot content might not be immediately available when the component is created. Here's how you can approach this: 1. First, make sure you have defined your component correctly in the components/content/ directory as mentioned in the Vue Components documentation (https://content.nuxt.com/usage/markdown/#vue-components). 2. In your component's <script setup>, you can use the following code: 
<script setup>
import { useSlots, onMounted, ref } from 'vue'

const slots = useSlots()
const slotContent = ref('')

onMounted(() => {
  if (slots.default) {
    slotContent.value = slots.default()[0].children
  }
})
</script>

<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Slot content: {{ slotContent }}</p>
  </div>
</template>
<script setup>
import { useSlots, onMounted, ref } from 'vue'

const slots = useSlots()
const slotContent = ref('')

onMounted(() => {
  if (slots.default) {
    slotContent.value = slots.default()[0].children
  }
})
</script>

<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Slot content: {{ slotContent }}</p>
  </div>
</template>
This approach uses the onMounted hook because the slot content might not be immediately available when the component is created. The ContentSlot component is used to render the slot content in the template, as shown in the ContentSlot documentation (https://content.nuxt.com/components/content-slot/). 3. If you need to process the slot content (in this case, the list of data), you can do so after it's available in the onMounted hook: 
<script setup>
import { useSlots, onMounted, ref } from 'vue'

const slots = useSlots()
const slotData = ref([])

onMounted(() => {
  if (slots.default) {
    const content = slots.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Processed slot data:</p>
    <ul>
      <li v-for="item in slotData" :key="item">{{ item }}</li>
    </ul>
  </div>
</template>
<script setup>
import { useSlots, onMounted, ref } from 'vue'

const slots = useSlots()
const slotData = ref([])

onMounted(() => {
  if (slots.default) {
    const content = slots.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Processed slot data:</p>
    <ul>
      <li v-for="item in slotData" :key="item">{{ item }}</li>
    </ul>
  </div>
</template>
This code splits the slot content by newlines and filters out any empty lines, giving you an array of the data items. Remember that when using components in Markdown, they need to be marked as global in your Nuxt app if you're not using the components/content/ directory. For more information, refer to the Nuxt 3 documentation on components (https://content.nuxt.com/usage/markdown/#vue-components). If you're still having issues, make sure that your component is properly set up and that the Markdown syntax for using the component is correct. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@154630566841417728> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Rost
RostOP•4w ago
@kapa.ai Does this also work when prerendering?
kapa.ai
kapa.ai•4w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- To answer your question about whether this approach works when prerendering, we need to consider how Nuxt handles server-side rendering and hydration. According to the Nuxt 3 documentation on components (https://nuxt.com/docs/guide/directory-structure/components#client-components), there can be issues with hydration when components rely on client-side state or DOM manipulation. The approach we discussed earlier, which uses onMounted, is primarily client-side and may not work as expected during prerendering. However, Nuxt 3 has recently introduced a new lifecycle hook called onPrehydrate that can help in such scenarios. This hook runs on the client immediately before Nuxt hydrates the page, as described in a recent GitHub pull request (https://github.com/nuxt/nuxt/pull/27037). Here's how you could modify the previous approach to work better with prerendering: 
<script setup>
import { useSlots, ref } from 'vue'

const slots = useSlots()
const slotData = ref([])

onPrehydrate(() => {
  if (slots.default) {
    const content = slots.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>

<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Processed slot data:</p>
    <ul>
      <li v-for="item in slotData" :key="item">{{ item }}</li>
    </ul>
  </div>
</template>
<script setup>
import { useSlots, ref } from 'vue'

const slots = useSlots()
const slotData = ref([])

onPrehydrate(() => {
  if (slots.default) {
    const content = slots.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>

<template>
  <div>
    <ContentSlot :use="$slots.default" unwrap="p" />
    <p>Processed slot data:</p>
    <ul>
      <li v-for="item in slotData" :key="item">{{ item }}</li>
    </ul>
  </div>
</template>
By using onPrehydrate, we ensure that the slot content is processed before the page is hydrated, which should work better with prerendering. However, it's important to note that onPrehydrate is a new feature and may not be available in all versions of Nuxt. Also, as mentioned in the pull request, the callback used with onPrehydrate should not have any external dependencies or refer to variables defined outside the callback. If you're still experiencing issues with prerendering, you might need to consider using a server-only component or exploring other server-side rendering techniques specific to your use case. Remember to test thoroughly in a prerendered environment to ensure everything works as expected. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@154630566841417728> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Rost
RostOP•4w ago
@kapa.ai I get a console error on the client side that slots is undefined
kapa.ai
kapa.ai•4w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- I understand you're encountering a console error on the client side indicating that slots is undefined. This issue is likely related to how slots are accessed and when they become available during the component lifecycle. Let's address this problem based on the information we have. The error you're seeing suggests that the slots object is not available when you're trying to access it. This can happen because slots might not be immediately accessible, especially on the client side during hydration. To resolve this issue, we can make a few adjustments to the approach: 1. First, we should use useSlots() inside a computed property to ensure reactivity: 
<script setup>
import { useSlots, computed, ref } from 'vue'

const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
<script setup>
import { useSlots, computed, ref } from 'vue'

const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
2. We can also add a check to ensure that slots is defined before accessing it: 
<script setup>
import { useSlots, computed, ref } from 'vue'

const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (slots.value && slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
<script setup>
import { useSlots, computed, ref } from 'vue'

const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (slots.value && slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
3. If you're still seeing issues, you might want to consider using the isHydrating property from useNuxtApp() to check if the app is currently hydrating. This can help you avoid accessing slots during hydration when they might not be available: 
<script setup>
import { useSlots, computed, ref } from 'vue'
import { useNuxtApp } from '#app'
const { isHydrating } = useNuxtApp()
const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (!isHydrating && slots.value && slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
<script setup>
import { useSlots, computed, ref } from 'vue'
import { useNuxtApp } from '#app'
const { isHydrating } = useNuxtApp()
const slots = computed(() => useSlots())
const slotData = ref([])

onPrehydrate(() => {
  if (!isHydrating && slots.value && slots.value.default) {
    const content = slots.value.default()[0].children
    slotData.value = content.split('\n').filter(item => item.trim() !== '')
  }
})
</script>
This approach uses the isHydrating property as mentioned in the Nuxt 3 documentation (https://nuxt.com/docs/api/composables/use-nuxt-app#ishydrating) to check if the app is currently hydrating. If you're still experiencing issues after trying these approaches, it might be worth considering using a client-only component for handling the slot content. You can do this by creating a new component and wrapping it with <ClientOnly>: 
<template>
  <ClientOnly>
    <SlotContentHandler :slot-content="$slots.default" />
  </ClientOnly>
</template>
<template>
  <ClientOnly>
    <SlotContentHandler :slot-content="$slots.default" />
  </ClientOnly>
</template>
Then in your SlotContentHandler component, you can process the slot content without worrying about server-side rendering or hydration issues. Remember to test these solutions thoroughly in your specific setup, as the behavior can vary depending on your exact Nuxt configuration and how you're using the components in your Markdown content. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@154630566841417728> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Rost
RostOP•4w ago
@kapa.ai I want the following: 
::component
abc
def
::
::component
abc
def
::
outputs: 
<ul>
<li>abc</li>
<li>def</li>
</ul>
<ul>
<li>abc</li>
<li>def</li>
</ul>
kapa.ai
kapa.ai•4w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- To achieve the desired output from your Markdown component, we can create a custom component that transforms the slot content into an HTML unordered list. Here's how you can do this using Nuxt Content: 1. First, create a new component file in your components/content/ directory. Let's call it Component.vue: 
<script setup>
import { useSlots, computed } from 'vue'

const slots = useSlots()

const listItems = computed(() => {
  if (slots.default && slots.default()[0].children) {
    return slots.default()[0].children
      .split('\n')
      .filter(item => item.trim() !== '')
  }
  return []
})
</script>

<template>
  <ul>
    <li v-for="item in listItems" :key="item">{{ item }}</li>
  </ul>
</template>
<script setup>
import { useSlots, computed } from 'vue'

const slots = useSlots()

const listItems = computed(() => {
  if (slots.default && slots.default()[0].children) {
    return slots.default()[0].children
      .split('\n')
      .filter(item => item.trim() !== '')
  }
  return []
})
</script>

<template>
  <ul>
    <li v-for="item in listItems" :key="item">{{ item }}</li>
  </ul>
</template>
This component does the following: - It uses the useSlots() composable to access the slot content. - It computes the listItems by splitting the slot content by newlines and filtering out empty lines. - In the template, it renders an unordered list with the computed items. 2. Now, you can use this component in your Markdown files like this: 
::component
abc
def
::
::component
abc
def
::
This should output: 
<ul>
  <li>abc</li>
  <li>def</li>
</ul>
<ul>
  <li>abc</li>
  <li>def</li>
</ul>
This approach leverages Nuxt Content's ability to use Vue components in Markdown, as described in the Vue components documentation (https://content.nuxt.com/usage/markdown/#vue-components). The component we created will be automatically available in your Markdown files because it's placed in the components/content/ directory. Remember that this solution assumes that each line in your Markdown component represents a list item. If you need more complex parsing or formatting, you might need to adjust the listItems computed property accordingly. Also, keep in mind that this approach works well with Nuxt Content's server-side rendering capabilities, so you shouldn't encounter issues with prerendering or hydration. If you face any problems or need to make adjustments, please let me know, and I'll be happy to help further. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@154630566841417728> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
Rost
RostOP•4w ago
@kapa.ai slot.default is undefined
kapa.ai
kapa.ai•4w ago
Let me check the knowledge base for you again. One moment! :books: ---------------------- I understand you're encountering an issue where slot.default is undefined. This problem can occur due to how slots are accessed in Nuxt Content components. Let's address this issue based on the information we have from the Nuxt Content documentation. The issue you're facing is likely because the slot content is not available immediately when the component is created. To resolve this, we can make a few adjustments to our approach: 1. First, let's use the <ContentSlot> component, which is specifically designed for handling content in Nuxt Content. Here's how we can modify our component: 
<script setup>
import { ref } from 'vue'

const listItems = ref([])

const processContent = (content) => {
  if (content) {
    listItems.value = content.split('\n').filter(item => item.trim() !== '')
  }
}
</script>

<template>
  <ContentSlot :use="$slots.default" unwrap="p" v-slot="{ text }">
    <ul>
      <li v-for="item in text.split('\n').filter(i => i.trim())" :key="item">
        {{ item }}
      </li>
    </ul>
  </ContentSlot>
</template>
<script setup>
import { ref } from 'vue'

const listItems = ref([])

const processContent = (content) => {
  if (content) {
    listItems.value = content.split('\n').filter(item => item.trim() !== '')
  }
}
</script>

<template>
  <ContentSlot :use="$slots.default" unwrap="p" v-slot="{ text }">
    <ul>
      <li v-for="item in text.split('\n').filter(i => i.trim())" :key="item">
        {{ item }}
      </li>
    </ul>
  </ContentSlot>
</template>
This approach uses the <ContentSlot> component, which is documented in the Nuxt Content API (https://content.nuxt.com/components/content-slot). It handles the slot content for us and provides it via the text prop in its scoped slot. 2. If you still need to access the slot content in the script section, you can use the onMounted hook: 
<script setup>
import { ref, onMounted } from 'vue'

const listItems = ref([])

onMounted(() => {
  const slot = useSlots().default
  if (slot && slot()[0].children) {
    listItems.value = slot()[0].children.split('\n').filter(item => item.trim() !== '')
  }
})
</script>

<template>
  <ul>
    <li v-for="item in listItems" :key="item">{{ item }}</li>
  </ul>
</template>
<script setup>
import { ref, onMounted } from 'vue'

const listItems = ref([])

onMounted(() => {
  const slot = useSlots().default
  if (slot && slot()[0].children) {
    listItems.value = slot()[0].children.split('\n').filter(item => item.trim() !== '')
  }
})
</script>

<template>
  <ul>
    <li v-for="item in listItems" :key="item">{{ item }}</li>
  </ul>
</template>
This approach ensures that we only try to access the slot content after the component has mounted. 3. If you're still facing issues, you might want to use the useContent composable to access the current page's content: 
<script setup>
import { useContent } from '#imports'

const { page } = useContent()
</script>

<template>
  <pre>{{ page }}</pre>
</template>
<script setup>
import { useContent } from '#imports'

const { page } = useContent()
</script>

<template>
  <pre>{{ page }}</pre>
</template>
This will allow you to inspect the entire content structure and find where your component's content is located. Remember, when using components in Markdown with Nuxt Content, they need to be placed in the components/content/ directory to be automatically available, as mentioned in the Vue Components documentation (https://content.nuxt.com/usage/markdown/#vue-components). If you're still experiencing issues after trying these approaches, please provide more details about your setup and how you're using the component in your Markdown files. This will help in providing a more specific solution to your problem. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•4w ago
<@154630566841417728> Kapa.ai is still learning and improving, please let me know how I did by reacting below.
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