mburger.js

/*
 * mburger webcomponent v1.3.3
 * mmenujs.com/mburger
 *
 * Copyright (c) Fred Heusschen
 * www.frebsite.nl
 *
 * License: CC-BY-4.0
 * http://creativecommons.org/licenses/by/4.0/
 */
export const mBurger = document.createElement('template');
mBurger.innerHTML = `
	<style>:host{--mb-button-size:60px;--mb-bar-width:0.6;--mb-bar-height:4px;--mb-bar-spacing:10px;--mb-animate-timeout:0s}:host{background:0 0;border:none;border-radius:0;color:inherit;display:inline-block;position:relative;box-sizing:border-box;height:var(--mb-button-size);padding:0 0 0 var(--mb-button-size);margin:0;line-height:var(--mb-button-size);vertical-align:middle;appearance:none;outline:0;cursor:pointer}:host b{display:block;position:absolute;left:calc(var(--mb-button-size) * ((1 - var(--mb-bar-width))/ 2));width:calc(var(--mb-button-size) * var(--mb-bar-width));height:var(--mb-bar-height);border-radius:calc(var(--mb-bar-height)/ 2);background:currentColor;color:inherit;opacity:1}:host b:nth-of-type(1){bottom:calc(50% + var(--mb-bar-spacing));transition:bottom .2s ease,transform .2s ease,width .2s ease}:host b:nth-of-type(2){top:calc(50% - (var(--mb-bar-height)/ 2));transition:opacity .2s ease}:host b:nth-of-type(3){top:calc(50% + var(--mb-bar-spacing));transition:top .2s ease,transform .2s ease,width .2s ease}:host([state=cross]) b:nth-of-type(1){bottom:calc(50% - (var(--mb-bar-height)/ 2));transform:rotate(45deg)}:host([state=cross]) b:nth-of-type(2){opacity:0}:host([state=cross]) b:nth-of-type(3){top:calc(50% - (var(--mb-bar-height)/ 2));transform:rotate(-45deg)}:host([fx=collapse]) b:nth-of-type(1){transition:bottom .2s ease,margin .2s ease,transform .2s ease;transition-delay:.2s,0s,0s}:host([fx=collapse]) b:nth-of-type(2){transition:top .2s ease,opacity 0s ease;transition-delay:.3s,.3s}:host([fx=collapse]) b:nth-of-type(3){transition:top .2s ease,transform .2s ease}:host([state=cross][fx=collapse]) b:nth-of-type(1){bottom:calc(50% - var(--mb-bar-spacing) - var(--mb-bar-height));margin-bottom:calc(var(--mb-bar-spacing) + (var(--mb-bar-height)/ 2));transform:rotate(45deg);transition-delay:calc(var(--mb-animate-timeout) + .1s),calc(var(--mb-animate-timeout) + .3s),calc(var(--mb-animate-timeout) + .3s)}:host([state=cross][fx=collapse]) b:nth-of-type(2){top:calc(50% + var(--mb-bar-spacing));opacity:0;transition-delay:calc(var(--mb-animate-timeout) + 0s),calc(var(--mb-animate-timeout) + .2s)}:host([state=cross][fx=collapse]) b:nth-of-type(3){top:calc(50% - (var(--mb-bar-height)/ 2));transform:rotate(-45deg);transition-delay:calc(var(--mb-animate-timeout) + .3s),calc(var(--mb-animate-timeout) + .3s)}:host([fx=spin]) b:nth-of-type(1){transition-delay:.2s,0s}:host([fx=spin]) b:nth-of-type(2){transition-duration:0s;transition-delay:.2s}:host([fx=spin]) b:nth-of-type(3){transition-delay:.2s,0s}:host([state=cross][fx=spin]) b:nth-of-type(1){transform:rotate(135deg);transition-delay:calc(var(--mb-animate-timeout) + 0s),calc(var(--mb-animate-timeout) + .2s)}:host([state=cross][fx=spin]) b:nth-of-type(2){transition-delay:calc(var(--mb-animate-timeout) + 0s)}:host([state=cross][fx=spin]) b:nth-of-type(3){transform:rotate(225deg);transition-delay:calc(var(--mb-animate-timeout) + 0s),calc(var(--mb-animate-timeout) + .2s)}:host([fx=squeeze]) b:nth-of-type(1){transition-delay:.1s,0s}:host([fx=squeeze]) b:nth-of-type(2){transition-delay:.1s}:host([fx=squeeze]) b:nth-of-type(3){transition-delay:.1s,0s}:host([state=cross][fx=squeeze]) b:nth-of-type(1){transition-delay:calc(var(--mb-animate-timeout) + 0s),calc(var(--mb-animate-timeout) + .1s)}:host([state=cross][fx=squeeze]) b:nth-of-type(2){transition-delay:calc(var(--mb-animate-timeout) + 0s)}:host([state=cross][fx=squeeze]) b:nth-of-type(3){transition-delay:calc(var(--mb-animate-timeout) + 0s),calc(var(--mb-animate-timeout) + .1s)}:host([fx=tornado]) b:nth-of-type(1){transition:bottom .2s ease,transform .2s ease;transition-delay:.2s}:host([fx=tornado]) b:nth-of-type(2){transition:opacity 0s ease,transform .2s ease;transition-delay:.1s,.1s}:host([fx=tornado]) b:nth-of-type(3){transition:top .2s ease,transform .2s ease;transition-delay:0s}:host([state=cross][fx=tornado]) b:nth-of-type(1){transform:rotate(-135deg);transition-delay:calc(var(--mb-animate-timeout) + 0s)}:host([state=cross][fx=tornado]) b:nth-of-type(2){opacity:0;transform:rotate(-135deg);transition-delay:calc(var(--mb-animate-timeout) + .4s),calc(var(--mb-animate-timeout) + .1s)}:host([state=cross][fx=tornado]) b:nth-of-type(3){transform:rotate(-225deg);transition-delay:calc(var(--mb-animate-timeout) + .2s)}</style>
	<b></b>
	<b></b>
	<b></b>
	<slot></slot>`;
customElements.define('m-burger', class extends HTMLElement {
    constructor() {
        super();
        /** The menu node. */
        this.menuNode = null;
        /** API for the menu. */
        this.menuApi = null;
        //	Attach shadow DOM
        var content = mBurger.content.cloneNode(true);
        this.attachShadow({ mode: 'open' }).appendChild(content);
    }
    static get observedAttributes() {
        return ['menu'];
    }
    attributeChangedCallback(name, oldValue, newValue) {
        if (name == 'menu') {
            //  Initiate the new menu.
            this.initMenu(newValue);
        }
    }
    connectedCallback() {
        //  Open the menu when clicking the hamburger.
        this.addEventListener('click', evnt => {
            //  If there is no API for a menu available (the menu isn't yet initiated),
            //  try to initiate the menu.
            if (!this.menuApi) {
                this.initMenu();
            }
            //  If there is an API for a menu available,
            //  open the menu.
            if (this.menuApi && this.menuApi.open) {
                this.menuApi.open();
            }
        });
    }
    /**
     * Set the menu node and API.
     * @param {string} [id] The ID-attribute for the menu node.
     */
    initMenu(id) {
        this.menuNode = null;
        this.menuApi = null;
        if (!id) {
            id = this.getAttribute('menu');
        }
        if (id) {
            this.menuNode = document.getElementById(id);
        }
        if (this.menuNode) {
            this.menuApi =
                this.menuNode['mmApi'] || this.menuNode['mmenu'] || null;
        }
        //  Change the hamburger state when opening and closing the menu.
        if (this.menuApi) {
            this.menuApi.bind('open:after', () => {
                this.setAttribute('state', 'cross');
            });
            this.menuApi.bind('close:after', () => {
                this.removeAttribute('state');
            });
        }
    }
});