Developed a new dynamic component in VUE that is functional, but encountered a warning stating "template or render function not defined."

I'm currently working on a dynamic markdown component setup that looks like this

<div v-highlight :is="markdownComponent"></div>

Here's the computed section:

computed: {
    markdownComponent() {
      return {
        template: this.html,
        data() {
          return {}
        },
        methods: { }
      }
    }
  }

The content of this.html is generated dynamically using markdown-it. I've implemented a code_block/fence rule to enhance the appearance of the pre > code block. A sample of the this.html content is as follows:

<div>
    <div class="code-header">
        <span class="code-language">
            Python
        </span>
        <a class="code-copy" @click="copyText('xxxx')">
        <i class="fa fa-copy"></i>
            Copy
        </a>
    </div>
  <pre>highlighted data</pre>
</div>

Although it functions properly, Vue raises a warning message:

[Vue warn]: Failed to mount component: template or render function not defined.

found in

---> <Anonymous>
       <Notes2> at src/note.vue
         <App> at src/App.vue
           <Root>

If I add an empty render function, the warning disappears but the page becomes blank:

computed: {
    markdownComponent() {
      return {
        render(h) {
           return h('div', {}, [])
        },
        template: this.html,
        data() {
          return {}
        },
        methods: { }
      }
    }
  }

}

Any ideas on how to include a "default" render function? I want to ensure proper rendering without Vue displaying that warning.

EDIT

I have already consulted Vue template or render function not defined yet I am using neither?, but it did not offer a solution to this specific issue

Answer №1

The issue has been successfully resolved

Inside the markdownComponent:

markdownComponent() {
  let html = this.html

  return {
    render(h) {
      return h('div', {
        domProps: {
          innerHTML: html
        },
        on: {
          click: this.clickHandler
        },
      })
    },
    data() {
      return {}
    },
    methods: {
      clickHandler(event) {
        let b64data = event.target.getAttribute('data-src')
        let data = Base64.decode(b64data).trim()
        this.$copyText(data)
      },
    }
  }
}

In code_block/fence rules, remove @click handler and add a HTML attribute instead.

As a result, VUE no longer raises any issues ..

Answer №2

Although it may not be apparent at first, the solution to your issue can actually be found in this article about Vue template or render function not defined yet I am using neither?.

If you're debating between Runtime + Compiler vs. Runtime-only, it's vital to gain a full understanding of the topic.

A key point to grasp is that Vue templates are always transformed into pure JavaScript, as illustrated by pasting code samples intovue-compiler-online. Since you're working with .vue files and bundlers like Webpack, which utilize vue-loader for compilation during build time, most Vue projects exclude the template compiler.

However, if your project includes any instances of the template tag, even within a Vue project, you'll require the Vue package with the compiler...

Alternatively, if the only Vue feature present in markdown-it's render output is an @click handler, then there's no necessity for a template. This eliminates the overhead of converting static HTML from markdown-it into JS and back to static HTML via Vue compilation.

  1. Eliminate modifications to your code_block/fence
  2. Create a suitable markdownComponent.vue (refer below)
  3. If the markdown originates from an untrusted source (e.g., user input) and you've enabled html:true in markdown-it, ensure you perform adequate sanitization of the markdown-it output
  4. Utilize v-html to render HTML generated by markdown-it
<template>
  <div>
    <div class="code-header">
        <span class="code-language">
            Python
        </span>
        <a class="code-copy" @click="copyText(html)">
        <i class="fa fa-copy"></i>
            Copy
        </a>
    </div>
    <pre v-html="html"></pre>
  </div>
</template>
<script>
export default {
  props: ['html'],
  methods: {
    copyText() {
      .....
    }
  }
}
<script>

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