happy-dom/lib/dom/DOMStringMap.js

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

import * as PropertySymbol from '../PropertySymbol.js';
import DOMStringMapUtility from './DOMStringMapUtility.js';
/**
 * Dataset factory.
 *
 * Reference:
 * https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset
 */
export default class DOMStringMap {
    /**
     * Constructor.
     *
     * @param illegalConstructorSymbol Illegal constructor symbol.
     * @param element Element.
     */
    constructor(illegalConstructorSymbol, element) {
        if (illegalConstructorSymbol !== PropertySymbol.illegalConstructor) {
            throw new TypeError('Illegal constructor');
        }
        // Documentation for Proxy:
        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
        return new Proxy(this, {
            get(_target, property) {
                const attribute = element.getAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property));
                if (attribute) {
                    return attribute;
                }
            },
            set(_target, property, value) {
                element.setAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property), value);
                return true;
            },
            deleteProperty(_target, property) {
                element.removeAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property));
                return true;
            },
            ownKeys(_target) {
                // According to Mozilla we have to update the dataset object (target) to contain the same keys as what we return:
                // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/ownKeys
                // "The result List must contain the keys of all non-configurable own properties of the target object."
                const keys = [];
                for (const items of element[PropertySymbol.attributes][PropertySymbol.itemsByName].values()) {
                    if (items[0][PropertySymbol.name].startsWith('data-')) {
                        keys.push(DOMStringMapUtility.kebabToCamelCase(items[0][PropertySymbol.name].replace('data-', '')));
                    }
                }
                return keys;
            },
            has(_target, property) {
                return element.hasAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property));
            },
            defineProperty(_target, property, descriptor) {
                if (descriptor.value === undefined) {
                    return false;
                }
                element.setAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property), descriptor.value);
                return true;
            },
            getOwnPropertyDescriptor(_target, property) {
                const attribute = element.getAttribute('data-' + DOMStringMapUtility.camelCaseToKebab(property));
                if (!attribute) {
                    return;
                }
                return {
                    value: attribute,
                    writable: true,
                    enumerable: true,
                    configurable: true
                };
            }
        });
    }
}
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