[Vuejs]-Create Vue function to update textarea without buffering

-1👍

I don’t quite understand what you’re trying to do, and I haven’t read your PHP file but you should bind the comment_body data to your input (textarea), Vue makes this possible with the use of v-model – much like Angular.
<textarea v-model="comment_body"></textarea>

Also, data must be a function. So instead of

data: {
 comment_body: ''
}

it must be

data() {
 return {
  comment_body: ''
 }
}

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