Source: documentation.js

/**
 * Documentation Component - used by "Portal Dashboard"
 * <BR><BR><img src=../images/documentation.png width=60%>
 * <BR><BR><a href="../html/documentation.html">DEMO</a>
 */
class Documentation extends HTMLElement {
    constructor() {
        console.group("Documentation.constructor")
	
        super();
        console.groupEnd();
    };
    
    /**
     * Set observable values here. When Changed, attributeChangedCallback is invoked
     * @observedAttributes
     */
    static get observedAttributes() {
        console.group("Documentation.observedAttributes");
	this.observables = ["background"];
        console.groupEnd();
        return this.observables;
    };
    /**
     * This function is called when this is attached to DOM
     * @connectedCallback. 
     */
    connectedCallback() {
        console.group("Documentation.connectedCallback")
	
	let self = this;
	// GET PROPERTIES AND INTERESTING ELEMENTS
	this._initialize();
	let items = __(".wc-documentation-item");
	for (var i=0; i<items.length; i++) {
	    let obj = items[i]
	    obj.addEventListener("click", function() {
		self._onClick(this.id);
	    });
	}
	// REPLACE CONTENT IF NECESSARY WITH NEW STUFF
	//this.innerHTML = this.dom.content;
	// ADD STATS AND OTHER FINAL STUFF
	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("Documentation.disconnectedCallback")
	/* CLEAN UP NOW */
        console.groupEnd();
    };
    /**
     * Called with .setAttribute(...) function call
     * @attributeChangedCallback
     */
    attributeChangedCallback(attr, oldval, newval) {
        console.group("Documentation.attributeChangedCallback:", attr, oldval, newval);
	this.properties = this.properties || [];
	let obs = Documentation.observedAttributes;
	for (let i = 0; i < obs.length; i++) {
	    this.properties[obs[i]] = newval;
	    // YOUR CODE FOR CHANGES GO HERE 
	}
	
        console.groupEnd();
    };
    /**
     * Stores DOM elements of interest for future use
     * @_fetchElements
     */
    _fetchElements() {
	console.group("Documentation._fetchElements");
	
	this.dom = this.dom || [];
	this.dom.content = this.innerHTML;
	console.groupEnd();
    };
    /**
     * Component attributes are _fetched and defaults are set if undefined
     * @_fetchAttributes
     * @param {string} [background=indianred] background color
     */
    _fetchAttributes() {
	console.group("Documentation._fetchAttributes");
	
	this.properties = {
	    "cname"	 : "Documentation",
	    "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) {
	    this.properties[key]  = this.getAttribute(key);
	    this.propertiesW[key] = this.getAttribute(key);
	    console.log(key + ": " + attrs[key]);
	}
	console.log("attributes: ", this.properties);
	// PROCESS ALL PROPERTIES (example below);
	// this.style.background = this.properties.background;
	console.groupEnd();
    };
    /**
     * A sample callback usage function - see connectedCallback()
     * @_onClick
     */
    _onClick(id) {
	console.group("Documentation._onClick:", id);
	let uparam = $("#" + id).attr("uparam");
	wc.publish(this, "wc-documentation", {
	    action: "click",
	    id: id,
	    uparam: uparam
	});
	console.groupEnd();
    };
    /**
     * Destroy the instance object and artifacts
     * @_destroy
     */
    destroy() {
	console.group("Documentation.destroy:", this.id);
	// FREE POINTER
	delete this;
	// REMOVE ITEM FROM DOM
	this.parentNode.removeChild(this);
	console.groupEnd();
    };
    /**
     * SAVE DATA FOR ANALYTICS
     * @__initialize
     */
    _initialize() {
	console.group("Documentation._initialize:", this.id);
	// FETCH ALL INTERESTING ELEMENTS
	this._fetchElements();
	// FETCH ALL ATTRIBUTES
	this._fetchAttributes();
	
	console.groupEnd();
    };
    /**
     * SAVE DATA FOR ANALYTICS
     * @__finalize
     */
    _finalize() {
	console.group("Documentation._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("Documentation.test");
	console.log("testing results will be printed here...");
	console.groupEnd();
	return true;
    }
}
window.customElements.define('wc-documentation', Documentation);