Problems using code-input in Vue.js

[Bowrna]

I want to use the syntax highlighter for my editor, and see the content only with syntax highlighted and in editable mode. But currently I see it in two different modes like below.
Is there any possibility to do it that way?

I am using this in VueJS and this is the code I have right now.

<template>
  <div ref="htmlEditor" class="html-editor">
    <textarea
      ref="editor"
      :value="value"
      @input="handleInput"
      is="code-input"
      data-language="html"
      :data-readonly="disabled"
      spellcheck="false"
    ></textarea>
  </div>
</template>

<script>
import Prism from 'prismjs';

export default {
  props: {
    value: { type: String, default: '' },
    language: { type: String, default: 'html' },
    disabled: Boolean,
  },

  methods: {
    handleInput(event) {
      this.$emit('input', event.target.value);
    },

    initializeEditor() {
      const textarea = this.$refs.editor;
      textarea.setAttribute('is', 'code-input');
      textarea.setAttribute('data-language', this.language);

      // Register Prism for syntax highlighting if needed
      if (window.codeInput) {
        window.codeInput.registerTemplate(
          'syntax-highlighted',
          window.codeInput.templates.prism(Prism, [])
        );
        window.codeInput.setDefaultTemplate('syntax-highlighted');
      }
    },
  },

  mounted() {
    this.initializeEditor();
  },
};
</script>

<style>
/* Hide the non-editable preview content */
.code-input pre[aria-hidden="true"] {
  display: none !important;
}

/* Additional styling */
.html-editor {
  width: 100%;
  position: relative;
}

.html-editor textarea {
  font-size: 15px;
  min-height: 200px;
  width: 100%;
  padding: 8px;
  border: none;
  resize: none;
}

.token.tag { font-weight: bold; }
.token.attr-name { color: #111; }
.token.attr-value { color: #0066cc; }

.html-editor textarea:focus {
  outline: none;
  border-color: #0066cc;
}
</style>

[WebCoder49]

Thanks for asking here, @Bowrna !

General Problems

There are several problems in this code (perhaps from my unclear documentation) that are making it not work. Please note that I know very little about Vue except that it is very similar to vanilla HTML/CSS/JavaScript so you may have problems in Vue code I haven't identified:

• You are not using code-input in the correct way: you are using a <textarea is="code-input"> element while the code-input library expects a <code-input> element, and does not expect any elements to be inside this element initially (just the initial text value). You can use the input event and value property of the <code-input> element instead of that of a textarea, and if you really need to access the <textarea> once code-input has created it you can use (code-input element).getElementByTagName("textarea").
• I'm also unsure of the purpose of the template element: code-input doesn't require it (maybe it's a Vue thing) and code-input.registerTemplate("syntax-highlighted", codeInput.templates.Prism(Prism, []) will set up all <code-input template="syntax-highlighted"> elements, with template being an HTML attribute not an element.
• The data-language attribute should be language without the "data-" part.
• Your textarea and token CSS will also be unnecessary when you import code-input and Prism.JS' CSS. You must import code-input's CSS for the editor to work, but Prism.JS' CSS doesn't need to be imported if you style its tokens yourself.

For more information, you should look at example code. The demo code (vanilla HTML/CSS/JS) strangely doesn't seem to have Prism highlighting work now - the more complicated but similar demo does. If needed, read through the README documentation and follow all of the steps that apply to you, especially the "Using the component" section. My labelling of the CSS-Tricks article will not be helpful since it explains the behind the scenes functioning but not the library usage - I have added a clarification to the documentation.

Changing language

You can use (code-input element).setAttribute("language", "HTML"), (code-input element).setAttribute("language", "Markdown"), and (code-input element).setAttribute("language", "plaintext"), and it should hopefully work.

Please let me know if you get it working, or if you have any further questions / it still doesn't work.

[WebCoder49]

Anyone who knows Vue better, please feel free to help!