Source: dialog.2.js

/**
 * Dialog-2 Component<BR>
 * <BR><BR><img src=/tk/lib/components/w/img/dialog-2.png width=30% style="border:1px lime dashed;padding:20px">
 * <BR><BR><a href="/tk/lib/components/w/html/dialog-2.html">DEMO</a>
 */
class Dialog2 extends HTMLElement {
    constructor() {
        wc.group("Dialog2.constructor")
	
        super();

        wc.groupEnd();
    };
    
    /**
     * Set observable values here. When Changed, attributeChangedCallback is invoked
     * @observedAttributes
     */
    static get observedAttributes() {
        wc.group("Dialog2.observedAttributes");

	this.observables = ["heading"];

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

    /**
     * Initial Markup
     * @private
     * @_template
     */
    _template() {
        wc.group("Dialog2.template");
	
	var temp = `
<div class="wc-dialog-mask wc-dialog-mask-transition wc-dialog-mask-active">
    <div class="wc-dialog-scroll-container">
	<div class="wc-dialog-container">
	    ${this.dom.content}
	</div>
    </div>
</div>`

        wc.groupEnd();
        return temp;
    };

    /**
     * Called when this is attached to DOM
     * @connectedCallback. 
     */
    connectedCallback() {
        wc.group("Dialog2.connectedCallback")
	
	// GET PROPERTIES AND INTERESTING ELEMENTS
	this._initialize();

	// ADD COMPONENT MARKTOP
	this.innerHTML = this._template()

	// IF BODY IS LOADED PROCESS ATTRIBUTES
	wc.wait4(".wc-dialog-body:not(:empty)", ()=> {
	    $(this).find(".wc-dialog-container")
		.addClass("dynamic")
		.width(this.properties.width)
		.height(this.properties.height)
		.css("margin-top", -this.properties.height/2)
		.css("margin-left", -this.properties.width/2)

	    $(this).find(".wc-dialog-body").height(this.properties.height-150);
	});

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

        wc.groupEnd();
    };

    /**
     * Publish all events of interest
     * @private
     * @_publish
     */
    _publish(action, value) {
	wc.group("Dialog2.publish:", action, value);
	
	switch(action) 
	{
	    case "headingChanged":
	    // PUBLISH THIS EVENT
	    wc.publish("wc-dialog-2", {
		time: new Date().getTime(),
		action: action,
		id: this.id,
		val: value
	    });
	    break;

	    default:
	    break;
	}

	wc.groupEnd();
    }

    /**
     * Called with .setAttribute(...) function call
     * @attributeChangedCallback
     */
    attributeChangedCallback(attr, oldval, newval) {
        wc.group("Dialog2.attributeChangedCallback:", attr, oldval, newval);

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

	let obs = Dialog2.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 "heading":
		this.dom.heading.innerHTML = newval;
		this._publish("headingChanged", 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("Dialog2._fetchElements");
	
	this.dom = this.dom || [];
	this.dom.content = this.innerHTML;
	this.dom.heading = this.querySelector("h1");

	wc.groupEnd();
    };

    /**
     * Component attributes are _fetched and defaults are set if undefined
     * @private
     * @_fetchAttributes
     */
    _fetchAttributes() {
	wc.group("Dialog2._fetchAttributes");
	
	this.properties = {
	    cname      : "Dialog2",
	    author     : "Mel M. 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 "headings":
		break;
		
		default:
		break;
	    }
	}

	wc.log("ATTRIBUTES: ", this.properties);

	wc.groupEnd();
    };

    /**
     * configure the instance object and artifacts
     * @configure
     */
    configure(jvar) {
	wc.group("Dialog2.configure:", jvar);

	$.getJSON(this.properties.url, function(data) {
	    wc.log(">>>>", data);			
	}).fail(function(jqXHR, textStatus, errorThrown) {
	    alert("incoming Text " + jqXHR.responseText);
	});

	wc.groupEnd();
    };

    /**
     * Initialize component
     * @private
     * @_initialize
     */
    _initialize() {
	wc.group("Dialog2._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("Dialog2._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("Dialog2.disconnectedCallback")

	// FREE MEMORY AND CLEANUP

        wc.groupEnd();
    };
}

window.customElements.define('wc-dialog-2', Dialog2);