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This is a component for Vue.js, features a simple TextArea with custom highlights. What's new in it is that you're in charge of the segmentation process, which means you can and must split text into segments and provide them to vue-hilight-textarea. You can specify different classes for each segment, and style these segments however you want(just don't change font sizes, spacing, or any thing that affects text layout). It also shows selection range mark while not having focus, and scrolls selection range into view upon programtic selection changes.

In case you wonder, we're placing a transparent textarea over a div of spans to show rich formatted text, and counting on their layouts match.

You can see demo at my online javascript RegExp tester page, which is why I created this project for.


        @update:selection="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, font and such, you can test it with .hta-border, which is the top level container.

Styling the hilights

Sepcify tag.class in segments passed to the component, it will apply to spans corresponding to each segment, then style with 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


Vue.js component for textarea hilighting.







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