Polyfill for CSS pseudo-class :has() in DOM Selectors API

A polyfill that adds support for the CSS pseudo-class :has() to the DOM Selectors API (by extending .querySelector(), .querySelectorAll(), .matches(), .closest() or called directly)

Polyfill does not use global environment variables in the code and therefore it can work both in the browser environment and in the server-side environment (for example with JSDOM)

Installation

npm install polyfill-pseudoclass-has --save

Usage

ES6 Modules

import * as polyfill from "polyfill-pseudoclass-has";

CommonJS

const polyfill = require("polyfill-pseudoclass-has");

UMD (for environments that do not support ES6 Modules)

UMD module can be used as a CommonJS module or by including it in the code using <script src="..." />:

<script src="/dist/polyfill.umd.js" />
<script>
const polyfill = window['polyfill-pseudoclass-has']; // can also be used via globalThis['polyfill-pseudoclass-has']
...
</script>

API

• SelectorHandler

  • constructor(globalSelector: string)

    // Example
    const selectorHandler = new SelectorHandler("body section:has(.foo):has(.bar) div:has(img)");

  • query(scopeNode: Element | Document | DocumentFragment): Element | null

    Searches for elements in the scopeNode (which can be an instance of an Element or a Document or a DocumentFragment). This is similar to Node.querySelectorAll().

    // Example
    const selectorHandler = new SelectorHandler("div:has(img)");
    selectorHandler.query(document);

  • queryAll(scopeNode: Element | Document | DocumentFragment): NodeListOf<Element>

    Search for a single element in the scopeNode (which can be an instance of an Element or a Document or a DocumentFragment). This is similar to Node.querySelector().

    // Example
    const selectorHandler = new SelectorHandler("div:has(img)");
    selectorHandler.queryAll(document);

  • matches(element: Element): boolean

    Checks if an element (is an instance of Element) matches a selector. This is similar to Element.matches().

    // Example
    const selectorHandler = new SelectorHandler("div:has(img)");
    selectorHandler.matches(divElement); // divElement - is an instance of Element 

  • closest(element: Element): Element | null

    Searches for the closest parent (and self) that matches the specified selector. This is similar to Element.closest().

    // Example
    const selectorHandler = new SelectorHandler("div:has(img)");
    selectorHandler.closest(divElement); // divElement - is an instance of Element 

• addToBrowser()

  Installing polyfill in the browser global environment. Note: Works only in a browser environment.

  // Example
  import { addToBrowser } from "polyfill-pseudoclass-has";
  addToBrowser();
  document.querySelectorAll('div:has(img)'); // now it's polyfilled

• removeFromBrowser()

  Uninstalling polyfill from the browser global environment. Note: Works only in a browser environment.

  // Example
  import { addToBrowser } from "polyfill-pseudoclass-has";
  removeFromBrowser();

• addTo(Element, Document, DocumentFragment)

  Installing of polyfill in global Element & Document & DocumentFragment nodes (for integration into a third-party environment, for example JSDOM).

  // Example
  import { addTo } from "polyfill-pseudoclass-has";
  addTo(Element, Document, DocumentFragment);
  document.querySelectorAll('div:has(img)'); // now it's polyfilled

  // Example with JSDOM:
  import { addTo } from "polyfill-pseudoclass-has";
  import { JSDOM } from "jsdom";
  
  const { window: { Element, Document, DocumentFragment } } = new JSDOM();
  addTo(Element, Document, DocumentFragment);

• removeFrom(Element, Document, DocumentFragment)

  Unstalling of polyfill from global Element & Document & DocumentFragment nodes (for integration into a third-party environment, for example JSDOM).

  // Example
  import { removeFrom } from "polyfill-pseudoclass-has";
  removeFrom(Element.prototype, Document.prototype, DocumentFragment.prototype);