@exadel/esl/modules/esl-base-element/core/esl-base-element.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

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import { setAttr } from '../../esl-utils/dom/attr';
import { prop } from '../../esl-utils/decorators';
import { ESLEventUtils } from '../../esl-utils/dom/events';
import { CSSClassUtils } from '../../esl-utils/dom/class';
/** Finalize tag name (`is`) for passed ESLBaseElement-based class */
const finalize = (type, tagName) => {
    Object.defineProperty(type, 'is', {
        get: () => tagName,
        set(value) {
            if (this === type)
                throw Error(`[ESL]: Cannot override ${type.name}.is property, the class is already registered`);
            Object.defineProperty(this, 'is', { value, writable: true, configurable: true });
        }
    });
};
/**
 * Base class for ESL custom elements
 * Allows defining custom element with the optional custom tag name
 */
export class ESLBaseElement extends HTMLElement {
    constructor() {
        super(...arguments);
        this._connected = false;
    }
    /** @returns custom element tag name */
    get baseTagName() {
        return this.constructor.is;
    }
    connectedCallback() {
        this._connected = true;
        this.classList.add(this.baseTagName);
        // Automatic subscription happens only if the element is currently in the DOM
        if (this.isConnected)
            ESLEventUtils.subscribe(this);
    }
    disconnectedCallback() {
        this._connected = false;
        ESLEventUtils.unsubscribe(this);
    }
    /**
     * Callback to handle changing of element attributes.
     * Happens when attribute accessed for writing independently of the actual value change
     */
    attributeChangedCallback(name, oldValue, newValue) { }
    /** Checks that the element's `connectedCallback` has been executed */
    get connected() {
        return this._connected;
    }
    $$on(event, handler) {
        return ESLEventUtils.subscribe(this, event, handler);
    }
    /** Unsubscribes event listener */
    $$off(...condition) {
        return ESLEventUtils.unsubscribe(this, ...condition);
    }
    /**
     * Gets or sets CSS classes for the current element.
     * @param cls - CSS classes query {@link CSSClassUtils}
     * @param value - boolean to set CSS class(es) state or undefined to skip mutation
     * @returns current classes state or passed state
     */
    $$cls(cls, value) {
        if (value === undefined)
            return CSSClassUtils.has(this, cls);
        CSSClassUtils.toggle(this, cls, value);
        return value;
    }
    /**
     * Gets or sets an attribute for the current element.
     * If the `value` param is undefined then skips mutation.
     * @param name - attribute name
     * @param value - string attribute value, boolean attribute state or `null` to delete attribute
     * @returns the current attribute value or previous value for mutation
     */
    $$attr(name, value) {
        const prevValue = this.getAttribute(name);
        if (value !== undefined)
            setAttr(this, name, value);
        return prevValue;
    }
    /**
     * Dispatches component custom event.
     * @param eventName - event name
     * @param eventInit - custom event init. See {@link CustomEventInit}
     */
    $$fire(eventName, eventInit) {
        return ESLEventUtils.dispatch(this, eventName, eventInit);
    }
    /**
     * Register component in the {@link customElements} registry
     * @param tagName - custom tag name to register custom element
     */
    static register(tagName) {
        tagName = tagName || this.is;
        if (!tagName)
            throw new DOMException('[ESL]: Incorrect tag name', 'NotSupportedError');
        const constructor = customElements.get(tagName);
        if (constructor && (constructor !== this || constructor.is !== tagName)) {
            throw new DOMException('[ESL]: Element tag already occupied or inconsistent', 'NotSupportedError');
        }
        if (constructor)
            return;
        finalize(this, tagName);
        customElements.define(tagName, this);
    }
    /** Shortcut for `customElements.whenDefined(currentCustomElement)` */
    static get registered() {
        return customElements.whenDefined(this.is);
    }
    static create() {
        return document.createElement(this.is);
    }
}
/** Custom element tag name */
ESLBaseElement.is = '';
__decorate([
    prop('esl:refresh')
], ESLBaseElement.prototype, "REFRESH_EVENT", void 0);