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Vue.js component for textarea hilighting.
Branch: master
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This is a component for vue.js, features a simple TextArea with custom highlights. It also shows selection range mark while not having focus, and scrolls selection range into view upon programtic selection changes. You can specify segments(they can overlap!) inside the text to be rendered with different classes, and style these segments however you want. Just remember, don't change font sizes, spacing, or any thing that affects text layout. Because we're just placing a transparent textarea over a div of spans to show text, and counting on their layouts match. And, here is the basic usage:

        @select="selection = $event"

      data: {
        text: "Hello, World."
        selection: {
            start: 0,
            end: 0,
            direction: "none"
      computed: {
          segments: function() {
                // this is where you can provide all the hilighting parts, updated when text changes
                var segments = [];
                for (var i = 0; i < this.text.length; i++) {
                    if (this.text.charAt(i) === "o") {
                        segments.push({ start: i, end: i + 2, tag: { class: "blue" } });
                return segments;

      .blue {
          color: blue

Thanks, Will Boyd, for your excelent work on jQuery plugin highlight-within-textarea.

How to use in your project

  • Just take the source code
  • Clone this project, and run npm run build-lib, then use the files inside dist folder
  • Or just use built dist\hilighttextarea.umd.min.js

How to change styles

Styling the editor

You can bring attributes such as readonly, rows, cols, class to the component, and they will apply to the textarea. If you want to change background, padding, margin and such, you can test it with .hta-container, .hta-input, .hta-backdrop, see how it fits.

Styling the hilights

Sepcify tag.class in segments passed to the component, it will apply to spans corresponding to each segment, then use that class in css.

Project setup

npm install

Compiles and hot-reloads for development

npm run serve

Compiles and minifies for production

npm run build

Create Vue components to deploy

npm run build-lib

Lints and fixes files

npm run lint
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