Source: steps.js

/**
 * Steps Component<BR>
 * <BR><BR><img src=/tk/lib/components/w/img/steps.png width=30% style="border:1px lime dashed;padding:20px">
 * <BR><BR><a href="/tk/lib/components/w/html/steps.html">DEMO</a>
 */
class Steps extends HTMLElement {
    constructor() {
        wc.group("Steps.constructor")
	
        super();

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

	this.observables = [];

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

    /**
     * Called when this is attached to DOM
     * @connectedCallback. 
     */
    connectedCallback() {
        wc.group("Steps.connectedCallback")
	
	// ADD A RANDOM ID IF NONE EXIST
	if (!this.id) {
	    this.id = this.constructor.name.toLowerCase() + "-" + wc.uid();
	}

	// GET PROPERTIES AND INTERESTING ELEMENTS
	this._initialize();

	this.configure();

	// ADD STATS AND OTHER FINAL STUFF
	this._finalize();

	ga('send', {'hitType': 'event','eventCategory': 'wc-connected','eventAction': 'connected','eventLabel': this.properties.cname, 'eventValue':JSON.stringify({'env':wcENV,'app':wcAPP,'url':wcURL})});

        wc.groupEnd();
    };

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

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

	let obs = Steps.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":
		//this.querySelector("h1").innerHTML = newval;
		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("Steps._fetchElements");
	
	this.dom = this.dom || [];
	this.dom.content = this.innerHTML;

	wc.groupEnd();
    };

    /**
     * Component attributes are _fetched and defaults are set if undefined
     * @private
     * @_fetchAttributes
     */
    _fetchAttributes() {
	wc.group("Steps._fetchAttributes");
	
	this.properties = {
	    uparam	: "",
	    cname	: "Steps",
	    author	: "Mel M. Heravi",
	    version	: "1.0",
	    clickable	: "false"
	};
	
	// 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();
    };

    /**
     * configure the instance object and artifacts
     * @configure
     * @param {string} data use data if exist else use 'this.properties.cfg' parameter
     */
    configure(data) {
	wc.group("Steps.configure:", data);

	// IF JSON VARIABLE (data) IS PROVIDED
	if (data) {
	    this._process(data);
	} else {
	    let self = this;

	    $.getJSON(this.properties.cfg, function(data) {
		self._process(data);
	    }).fail(function(jqXHR, textStatus, errorThrown) {
		alert("ERROR: INCOMING TEXT " + jqXHR.responseText);
	    });
	}

	wc.groupEnd();
    };

    /**
     * _process the instance object and artifacts
     * @private
     * @_process
     */
    _process(data) {
	wc.group("Steps._process:", data);
	
	let self = this;

	let str1 = `<div class="step-app"><ul class="step-steps">`;
	let str2 = "";
	let str3 = `<div class="step-content">`;

	for (var i = 0; i < data.length; i++) {
	    str2 += `<li><a href="#${data[i].id}">${data[i].label}</a></li>`;
	    str3 += `<div class="step-tab-panel" id="${data[i].id}"><wc-include href="${data[i].url}"></wc-include></div>`;
	}

	str2 += "</ul>"
	str1 += `${str2}`;
	
	str1 += `${str3}</div>
	    <div class="step-footer">
		<button data-direction="prev"   class="step-btn btn btn-outline-secondary col-2"><i class="fa fa-angle-left"></i> PREVIOUS</button>
		<button data-direction="next"   class="step-btn btn btn-outline-secondary col-2">NEXT <i class="fa fa-angle-right"></i></button>
		<button data-direction="finish" class="step-btn btn btn-outline-success col-2">FINISH</button>
	    </div></div>`;

	// ADD COMPONENT MARKTOP
	this.innerHTML = str1;

	if (this.properties.clickable == "false") {
	    $(this).find("ul li a").on("click", function(e) {
		e.preventDefault();
		e.stopPropagation();
	    });
	}

	this.steps = $("#" + this.id).steps({
	    showBackButton: this.properties.backbutton == true,

	    onChange: function (currentIndex, newIndex, stepDirection) {
		if (stepDirection == "forward") {
		    wc.publish("wc-steps", {
			time: new Date().getTime(),
			action: "forward",
			index: currentIndex
		    });
		}

		if (stepDirection == "none") {
		    wc.publish("wc-steps", {
			time: new Date().getTime(),
			action: "new",
			index: newIndex
		    });
		}

		return true;
	    },
	    onFinish: function () {
		wc.publish("wc-steps", {
		    time: new Date().getTime(),
		    action: "finished"
		});
	    }
	});

	// $("#wc .step-app > .step-steps > li.active a")
	//     .css("background", this.properties.active)
	//     .pseudo(":after","background","red")
	//     .pseudo(":after","color","brown");

	wc.groupEnd();
    };

    /**
     * Initialize component
     * @private
     * @_initialize
     */
    _initialize() {
	wc.group("Steps._initialize:", this.id);

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

	// FETCH ALL ATTRIBUTES
	this._fetchAttributes();
	
	wc.groupEnd();
    };

    /**
     * Save data for analytics and final wrap up
     * @private
     * @_finalize
     */
    _finalize() {
	wc.group("Steps._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("Steps.disconnectedCallback")

	ga('send', {'hitType': 'event','eventCategory': 'wc-disconnected','eventAction': 'disconnected','eventLabel': this.properties.cname, 'eventValue':JSON.stringify({'env':wcENV,'app':wcAPP,'url':wcURL})});

        wc.groupEnd();
    };

    /**
     * Destroy the instance object and artifacts
     * @destroy
     */
    destroy() {
	wc.group("Steps.destroy");

	// FREE ALL MEMORY
	// you should delete all created objects here
	
	// FREE POINTER
	delete this;
	
	// REMOVE ITEM FROM DOM
	this.parentNode.removeChild(this);

	ga('send', {'hitType': 'event','eventCategory': 'wc-destroyed','eventAction': 'distroy','eventLabel': this.properties.cname, 'eventValue':JSON.stringify({'env':wcENV,'app':wcAPP,'url':wcURL})});

	wc.groupEnd();
    };
}

window.customElements.define('wc-steps', Steps);