React component to highlight words within a larger body of text.

Check out a demo here.

Usage

To use it, just provide it with an array of search terms and a body of text to highlight.

Try this example in Code Sandbox.

import React from "react";
import ReactDOM from "react-dom";
import Highlighter from "react-highlight-words";

ReactDOM.render(
  <Highlighter
    highlightClassName="YourHighlightClass"
    searchWords={["and", "or", "the"]}
    autoEscape={true}
    textToHighlight="The dog is chasing the cat. Or perhaps they're just playing?"
  />,
  document.getElementById("root")
);

And the Highlighter will mark all occurrences of search terms within the text:

Props

| Property | Type | Required? | Description | |:---|:---|:---:|:---| | activeClassName | String | | The class name to be applied to an active match. Use along with activeIndex | | activeIndex | Number | | Specify the match index that should be actively highlighted. Use along with activeClassName | | activeStyle | Object | | The inline style to be applied to an active match. Use along with activeIndex | | autoEscape | Boolean | | Escape characters in searchWords which are meaningful in regular expressions | | className | String | | CSS class name applied to the outer/wrapper <span> | | caseSensitive | Boolean | | Search should be case sensitive; defaults to false | | findChunks | Function | | Use a custom function to search for matching chunks. This makes it possible to use arbitrary logic when looking for matches. See the default findChunks function in highlight-words-core for signature. Have a look at the custom findChunks example on how to use it. | | highlightClassName | String or Object | | CSS class name applied to highlighted text or object mapping search term matches to class names. | | highlightStyle | Object | | Inline styles applied to highlighted text | | highlightTag | Node | | Type of tag to wrap around highlighted matches; defaults to mark but can also be a React element (class or functional) | | sanitize | Function | | Process each search word and text to highlight before comparing (eg remove accents); signature (text: string): string | | searchWords | Array<String | RegExp> | ✓ | Array of search words. String search terms are automatically cast to RegExps unless autoEscape is true. | | textToHighlight | String | ✓ | Text to highlight matches in | | unhighlightClassName | String | | CSS class name applied to unhighlighted text | | unhighlightStyle | Object | | Inline styles applied to unhighlighted text | | * | any | | Any other props (such as title or data-*) are applied to the outer/wrapper <span> |

Custom highlight tag

By default this component uses an HTML Mark Text element (<mark>) to wrap matched text, but you can inject a custom tag using the highlightTag property. This tag should be a React component that accepts the following properties:

| Property | Type | Description | |:---|:---|:---| | children | String | Text to be highlighted | | highlightIndex | Number | Index of matched text |

For example:

const Highlight = ({ children, highlightIndex }) => (
  <strong className="highlighted-text">{children}</strong>
);

Installation

yarn add react-highlight-words

npm i --save react-highlight-words

License

MIT License - fork, modify and use however you want.