Vue 3: Dynamic Components in Database HTML Are Not Rendering

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I'm storing my Vue 3 blog articles in MongoDB with HTML content that includes dynamic components, such as replacing static image tags with an to simplify image management. However, when this content is rendered, the dynamic component is not activated—only the static HTML is displayed.

For example, I have content stored like this:

HTML
<a class='image' href='https://cdn.example.com/images/2024-03-09-00048/fit=contain,width=1280,sharpen=100' title='2024'><img  src='https://cdn.example.com/images/2024-03-09-00048/fit=contain,width=1280,sharpen=100' title='2024' alt='Photo alt'/></a>

which I want to transform into:

HTML
<ImageComponent _id='2024-03-09-00048' alt='Photo alt text' title='2024 ⋅ New York, US' flag='US'/></ImageComponent>"

My Article.vue looks like this:

VUE
<section aria-labelledby="article-title" class="article-content">
    <dynamicContent :htmlContent="String(state.article.content)" />
</section>

And the dynamic-content component is implemented as follows:

VUE
<script setup>
import { onMounted, ref } from "vue";
import "https://cdn.jsdelivr.net/npm/lite-vimeo-embed/+esm";

const props = defineProps({
  htmlContent: {
    type: String,
    required: true,
  },
});

const content = ref(null);

onMounted(() => {
  if (content.value) {
    content.value.innerHTML = props.htmlContent;

    // Add 'reveal' class to all child elements
    const elements = content.value.querySelectorAll("*");
    elements.forEach((element) => {
      element.classList.add("reveal");
    });
  }
});
</script>

<template>
  <div ref="content"></div>
</template>

The dynamic components should render correctly as Vue components within the article content. Instead, they are rendered as static HTML.

This makes me wonder if inserting component tags directly in the database is the best approach. Should I consider restructuring my articles into smaller content blocks (e.g., separating text and images) so that I can leverage Vue’s dynamic component syntax more effectively?

Any insights or recommended approaches would be appreciated.

Comments 0

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Answers 1

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1 Answer

Answer by StackOverflow TychoAI Agent • 1 month ago

When you insert HTML from the database using innerHTML, Vue’s compiler isn’t processing that content to recognize dynamic components like . The content is treated as plain static HTML, so Vue never “activates” the dynamic behavior.

Below are two recommended approaches:

1. Structure Your Content as Data

Instead of storing raw HTML that contains component tags, consider breaking your article into structured pieces. For example, store your article as an array of content blocks:

JS
// Example article data stored in MongoDB
const articleBlocks = [
  { type: 'TextBlock', content: '<p>Lorem ipsum dolor sit amet.</p>' },
  { 
    type: 'ImageComponent', 
    props: { 
      _id: '2024-03-09-00048', 
      alt: 'Photo alt text', 
      title: '2024 ⋅ New York, US', 
      flag: 'US'
    }
  }
]

Then render these blocks using the dynamic component syntax:

VUE
<script setup>
import ImageComponent from './ImageComponent.vue'
import TextBlock from './TextBlock.vue'

// Map component types to actual components
const components = {
  ImageComponent,
  TextBlock
}

// Assume articleBlocks is fetched from your DB
const articleBlocks = ref([
  { type: 'TextBlock', content: '<p>Lorem ipsum dolor sit amet.</p>' },
  { 
    type: 'ImageComponent', 
    props: { 
      _id: '2024-03-09-00048', 
      alt: 'Photo alt text', 
      title: '2024 ⋅ New York, US', 
      flag: 'US'
    }
  }
])
</script>

<template>
  <div>
    <component 
      v-for="(block, index) in articleBlocks" 
      :is="components[block.type]"
      :key="index"
      v-bind="block.props"
      v-if="block.type === 'ImageComponent'"
    />
    <div v-for="(block, index) in articleBlocks" 
         :key="`text-${index}`" 
         v-if="block.type === 'TextBlock'" 
         v-html="block.content">
    </div>
  </div>
</template>

This approach leverages Vue’s dynamic component functionality and ensures that each part of your article is properly compiled and reactive.

2. Runtime Template Compilation (Not Recommended)

Another route is attempting to compile inserted HTML at runtime, but this method is generally discouraged due to performance and security issues. Vue 3 does not support runtime compilation out of the box in production builds, so you’d need to include the compiler separately. This also won’t work nicely with dynamic component registration without significant overhead.

Summary

Using innerHTML to insert HTML from your database bypasses Vue’s template compiler. Instead, consider structuring your article content as data (like splitting it into text and image blocks) and rendering it using Vue’s built-in dynamic component syntax (). This not only ensures that your dynamic components are rendered correctly but also gives you more control and flexibility over your content.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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