Source: flip.js

/**
 * Flip Component<BR>
 * <BR><BR><img src=/tk/lib/components/w/img/flip.png width=70% style="border:1px lime dashed;padding:20px">
 * <BR><BR><a href="/tk/lib/components/w/html/flip.html">DEMO</a>
 */
class Flip extends HTMLElement {
    constructor() {
        wc.group("Flip.constructor")
	
        super();
        wc.groupEnd();
    };
    
    /**
     * Set observable values here. When Changed, attributeChangedCallback is invoked
     * @observedAttributes
     */
    static get observedAttributes() {
        wc.group("Flip.observedAttributes");
	this.observables = [];
        wc.groupEnd();
        return this.observables;
    };
    /**
     * This function is called get component template
     * @template
     */
    template() {
        wc.group("Flip.template");
	
	let w = $(this).parent().width();
	let h = $(this).parent().height();
	let tmp = `
	    <wc-flip-container>
		<wc-flipper>
		    ${this.dom.content}
		</wc-flipper>
	    </wc-flip-container>`
	wc.timeout(() => {
	    let con = this.querySelector("wc-flip-container");
	    $(con).on("click", function() {
		$(this).addClass("hover");
	    });
	    $(con).mouseleave(function() {
		$(this).removeClass("hover");
	    });
	}, 300);
        wc.groupEnd();
        return tmp;
    };
    /**
     * This function is called when this is attached to DOM
     * @connectedCallback. 
     */
    connectedCallback() {
        wc.group("Flip.connectedCallback")
	
	let self = this;
	// GET PROPERTIES AND INTERESTING ELEMENTS
	this._initialize();
	// REPLACE CONTENT FROM TEMPLATE
	this.innerHTML = this.template();
	
	// PUBLISH INTERESTING EVENTS
	this._publish();
	
	// ADD STATS AND OTHER FINAL STUFF
	this._finalize();
	
        wc.groupEnd();
    };
    /**
     * Publish all events
     * @private
     * @_publish
     */
    _publish() {
	wc.group("Flip.publish");
	this.addEventListener("click", e => {
	    wc.publish("wc-flip", {
		time: new Date().getTime(),
		action: "click",
		id: this.id,
		uparam: this.properties.uparam
	    });
	});
	
	wc.groupEnd();
    }
    /**
     * Called with .setAttribute(...) function call
     * @attributeChangedCallback
     */
    attributeChangedCallback(attr, oldval, newval) {
        wc.group("Flip.attributeChangedCallback:", attr, oldval, newval);
	this.properties = this.properties || [];
	let obs = Flip.observedAttributes;
	for (let i = 0; i < obs.length; i++) {
	    if (newval) {
		this.properties[obs[i]] = newval;
	    }
	}
	
	// YOUR CODE FOR CHANGES GO HERE (MAYBE NULL FIRST TIME THROUGH)
	try {
	    switch(attr) 
	    {
		case "header":
		break;
		
		default:
		break;
	    }
	} catch(e) {
	    wc.warn(e.name + ' > ' + e.message);
	}
        wc.groupEnd();
    };
    /**
     * Stores DOM elements of interest for future use
     * @private
     * @_fetchElements
     */
    _fetchElements() {
	wc.group("Flip._fetchElements");
	
	this.dom = this.dom || [];
	this.dom.content = this.innerHTML;
	wc.groupEnd();
    };
    /**
     * Component attributes are _fetched and defaults are set if undefined
     * @private
     * @_fetchAttributes
     * @param {string} [modal=true] mode for our flip
     */
    _fetchAttributes() {
	wc.group("Flip._fetchAttributes");
	
	this.properties = {
	    cname	: "flip",
	    author	: "Mel Heravi",
	    version	: "1.0",
	};
	
	// SAVE WIDGET SPECIFIC PROPERTIES
	this.propertiesW = [];
	
	// SAVE ALL OTHER PROPERTIES
	let attrs = wc.getAttributes(this)
	
 	for (var key in attrs) {
	    let attr = this.getAttribute(key) || this.properties.key;
	    this.properties[key]  = this.getAttribute(key);
	    this.propertiesW[key] = this.getAttribute(key);
	    wc.log(key + ": " + attrs[key]);
	}
	// SET ALL INITIAL ATTRIBUTES
 	for (var key in this.properties) {
	    switch(key) 
	    {
		case "header":
		break;
		
		default:
		break;
	    }
	}
	wc.log("ATTRIBUTES: ", this.properties);
	wc.groupEnd();
    };
    /**
     * Destroy the instance object and artifacts
     * @destroy
     */
    destroy() {
	wc.group("Flip.destroy:", this.id);
	// FREE ALL MEMORY
	// you should delete all created objects here
	// FREE POINTER
	delete this;
	// REMOVE ITEM FROM DOM
	this.parentNode.removeChild(this);
	wc.groupEnd();
    };
    /**
     * configure the instance object and artifacts
     * @configure
     */
    configure(options) {
	wc.group("Flip.configure:", JSON.stringify(options));
	// PROCESS ALL OPTIONS HERE
	wc.groupEnd();
    };
    /**
     * SAVE DATA FOR ANALYTICS
     * @private
     * @_initialize
     */
    _initialize() {
	wc.group("Flip._initialize:", this.id);
	// FETCH ALL INTERESTING ELEMENTS
	this._fetchElements();
	// FETCH ALL ATTRIBUTES
	this._fetchAttributes();
	
	wc.groupEnd();
    };
    /**
     * SAVE DATA FOR ANALYTICS
     * @private
     * @_finalize
     */
    _finalize() {
	wc.group("Flip._finalize:", this.id);
	this.classList.add("wc");
	// ADD ANALYTICS HERE
	wc.setStats(this, this.properties.cname, this.properties.version);
	
	// SHOW IT NOW (NO FLICKERS) 
	this.style.visibility = "visible";
	wc.groupEnd();
    };
    /**
     * Invoked When component is removed. Usually with a .remove() function call
     * @disconnectedCallback
     */
    disconnectedCallback() {
        wc.group("Flip.disconnectedCallback")
	/* CLEAN UP NOW */
        wc.groupEnd();
    };
}
window.customElements.define('wc-flip', Flip);