Source: header.js

/**
 * Header Component <BR>
 * This component will replace both thick and thin components moving forward<BR>
 * <BR><BR><img src=../images/header.png width=100% style="border:1px lime dashed";>
 * <BR><BR><a href="../html/header.html">DEMO</a>
 */
class Header extends HTMLElement {
    constructor() {
        console.group("Header.constructor")
	
        super();

        console.groupEnd();
    };
    
    /**
     * Set observable values here. When Changed, attributeChangedCallback is invoked
     * @observedAttributes
     */
    static get observedAttributes() {
        console.group("Header.observedAttributes");

	this.observables = ["uname", "aname", "sname", "env"];
	console.log(this.observables);

        console.groupEnd();
        return this.observables;
    };

    /**
     * This function is called when this is attached to DOM
     * @connectedCallback. 
     */
    connectedCallback() {
        console.group("Header.connectedCallback")
	
	let self = this;

	// FETCH ALL INTERESTING ELEMENTS
	this._fetchElements();

	// FETCH ALL ATTRIBUTES
	this._fetchAttributes();

	// REPLACE CONTENT IF NECESSARY WITH NEW STUFF
	this.innerHTML = `
<div class="wc-header-container ${this.properties.lob} lob-border-bottom">
    <div class="wc-header-inner clearfix">
	<div class='container'>
	    <div class='row'>
		<div class='col-md-12'>
		    <div class="wc-header-lhs pull-left">
			<div class="clearfix">
			    <div class="wc-header-logo pull-left"><img src="/Melify/mtk/dev/tk/lib/components/w3c/assets/dtcc.png"></div>
			    <div class="wc-header-sep pull-left"></div>
			    <div class="wc-header-app pull-left">
				<div class="wc-header-app-sname clearfix">${this.properties.sname}</div>
				<div class="wc-header-app-aname ${this.properties.lob} lob-color clearfix">
				    <div class="wc-color">${this.properties.aname} <font color=red><small>${this.properties.env}</font></small></div>
				</div>
			    </div>
			</div>
		    </div>
		    <div class="wc-header-rhs pull-right">
			<div class="wc-header-top-menus">
			    ${this.dom.topmenus}
			</div>
			<div class="wc-header-user">
			    <div class="clearfix">
				<div class="wc-header-cog pull-right">
				    ${this.dom.cogmenus}
				</div>

				<div class="wc-header-logout pull-right">
				    <a href="#" id="header-logout">Logout</a>
				</div>

				<div class="wc-header-uname pull-right">${this.properties.uname}</div>
			    </div>
			</div>
		    </div>
		</div>
	    </div>
	</div>
    </div>

    <div class="wc-header-network clearfix ${this.properties.lob} lob-pattern">
	<div class="wc-header-network-inner clearfix">
	    <div class='container'>
		<div class='row'>
		    <div class='col-md-12'>
			<div class="wc-header-network-lhs pull-left">
			    <div class="wc-header-bot-menus">
				${this.dom.botmenus}
			    </div>
			</div>
			<div class="wc-header-network-rhs pull-right">
			    <div class="clearfix">
				<div class="pull-right"><i class="fa fa-search"></i></div>
				<div class="pull-right"><input name="search" value="" class="form-control" style=background:#333!important;border:0!important></div>
			    </div>
		    </div>
		</div>
	    </div>
	</div>
    </div>
</div>`;
	
	// DO DROPDOWN BOTTOM BORDERS NOW
	let dropdown = __(".dropdown-menu");
	$(dropdown).addClass(this.properties.lob);
	$(dropdown).addClass("lob-border-bottom");

	if (this.properties.search === "false") {
	    let search = this.querySelector(".wc-header-network-rhs .clearfix");
	    $(search).hide();
	}

	let links = this.querySelectorAll("a");

	for (let i=0; i<links.length; i++) {
	    let link = links[i];

	    if (link.id != "") {
		link.addEventListener("click", function() {
		    self._onClick(link);
		});
	    }
	}

	this._finalize();

	// SHOW IT NOW (NO FLICKERS) 
	this.style.visibility = "visible";

        console.groupEnd();
    };

    /**
     * Invoked When component is removed. Usually with a .remove() function call
     * @disconnectedCallback
     */
    disconnectedCallback() {
        console.group("Header.disconnectedCallback")

	/* CLEAN UP NOW */

        console.groupEnd();
    };

    /**
     * Called with .setAttribute(...) function call
     * @attributeChangedCallback
     */
    attributeChangedCallback(attr, oldval, newval) {
        console.group("Header.attributeChangedCallback:", attr, oldval, newval);

	this.properties = this.properties || [];

	console.log("attributes: ", this.properties);
	// EXAMPLE ONLY. replace with observables
	switch(attr)
	{
	    case "uname":
	    this.properties.uname = newval;
	    this.style.uname = this.properties.uname;
	    break;

	    case "aname":
	    this.properties.aname = newval;
	    this.style.aname = this.properties.aname;
	    break;

	    case "sname":
	    this.properties.sname = newval;
	    this.style.sname = this.properties.sname;
	    break;

	    case "env":
	    this.properties.env = newval;
	    this.style.env = this.properties.env;
	    break;
	}
	
        console.groupEnd();
    };

    /**
     * Stores DOM elements of interest for future use
     * @_fetchElements
     */
    _fetchElements() {
	console.group("Header._fetchElements");
	
	this.dom = this.dom || [];
	this.dom.topmenus = this.querySelector("wc-header-topmenus").innerHTML;
	this.dom.botmenus = this.querySelector("wc-header-botmenus").innerHTML;
	this.dom.cogmenus = this.querySelector("wc-header-cogmenus").innerHTML;

	console.groupEnd();
    };

    /**
     * Component attributes are _fetched and defaults are set if undefined
     * @_fetchAttributes
     * @param {string} [uname=NOTSET] user name
     * @param {string} [sname=NOTSET] service name
     * @param {string} [aname=NOTSET] application name
     * @param {string} env environment
     */
    _fetchAttributes() {
	console.group("Header._fetchAttributes");
	
	this.properties = {
	    "cname"	 : "Header",
	    "author"     : "Mel Heravi",
	    "version"    : "1.0",
	    "uname"      : "NOTSET",
	    "aname"      : "NOTSET",
	    "sname"      : "NOTSET",
	    "env"        : "",
	};
	
	// SAVE WIDGET SPECIFIC PROPERTIES
	this.propertiesW = [];

	// SAVE ALL OTHER PROPERTIES
	let attrs = wc.getAttributes(this)
	
 	for (var key in attrs) {
	    this.properties[key]  = this.getAttribute(key);
	    this.propertiesW[key] = this.getAttribute(key);
	    console.log(key + ": " + attrs[key]);
	}

	console.groupEnd();
    };

    /**
     * A sample callback usage function - see connectedCallback()
     * @_onClick
     */
    _onClick(link) {
	console.group("Header._onClick:", link);

	wc.publish(this, "wc-header", {
	    action: "click",
	    id: link.id
	});

	console.groupEnd();
    };

    /**
     * Destroy the instance object and artifacts
     * @_destroy
     */
    destroy() {
	console.group("Header.destroy:", this.id);

	// FREE POINTER
	delete this;

	// REMOVE ITEM FROM DOM
	this.parentNode.removeChild(this);

	console.groupEnd();
    };

    /**
     * SAVE DATA FOR ANALYTICS
     * @__finalize
     */
    _finalize() {
	console.group("Header._finalize:", this.id);

	this.classList.add("wc");

	// ADD ANALYTICS HERE
	wc.getStats(this, this.properties.cname, this.properties.version);
	
	console.groupEnd();
    };

    /**
     * FOR TESTING PURPOSES
     * @test
     */
    static test() {
	console.group("Header.test");

	console.log("testing results will be printed here...");

	console.groupEnd();
	return true;
    }
}

window.customElements.define('wc-header', Header);