Source: survey.js

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

        super();

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

	this.observables = [];

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

    /**
     * Called when this is attached to DOM
     * @connectedCallback.
     */
    connectedCallback() {
        wc.group("Survey.connectedCallback")

	var self = this;

	// 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();

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

	let side = this.properties.side;

	wc.wait4("#" + side, function(ele) {
	    $("#" + side).tabSlideOut({
		tabLocation: side,
		action: 'click',
		handleOffsetReverse: true,
		offsetReverse: true,
		bounceTimes: 3,
		bounceDistance: '10px',
		bounceSpeed: 200,
		onOpen: function(){
		    $(self).find(".handle .fa").removeClass("fa-plus").addClass("fa-minus")
		    console.log("OPEN")
		},
		onClose: function(){
		    $(self).find(".handle .fa").removeClass("fa-minus").addClass("fa-plus")
		    console.log("CLOSED")
		}      
	    });

	    // CLOSE DRAWER WHEN SUBMITTED THE FORMS
	    function receiveOLMessage(event) {
		var data = event.data;  

		if (event.origin !== "https://gen3.opinionlab.com") {
		    return;
		} else {
		    if (typeof data !== 'undefined' && data == 'ol-submitted') {
			alert("SHOULD CLOSE IT NOW");
		    }
		}
	    }

	    // TRACK THIS EVENT
	    window.addEventListener("message", receiveOLMessage, false);
	});

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

        wc.groupEnd();
    };

    /**
     * Initial Markup
     * @private
     * @_template
     */
    _template() {
        wc.group("Survey.template");

	if (this.properties.iframe == "true") {
	    var temp = `
<div id="${this.properties.side}">
   <a id="${this.properties.side}-handle" class="handle ui-slideouttab-handle ui-slideouttab-handle-rounded"><span class="survey-label">${this.properties.label}</span></a>

   <div id="${this.properties.side}-subpanel" style="height:${this.properties.height}">
<iframe src="${this.properties.src}" width="100%" height="100%" frameborder="0" scrolling="NO"></iframe>
   </div>
</div>`
	} else {
	    var temp = `
<div id="${this.properties.side}">
   <a id="${this.properties.side}-handle" class="handle ui-slideouttab-handle ui-slideouttab-handle-rounded"><span class="survey-label">${this.properties.label}</span></a>

   <div id="${this.properties.side}-subpanel">      
<wc-include href="${this.properties.src}"</wc-include>"
   </div>
</div>`
	}

        wc.groupEnd();
        return temp;
    };

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

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

	let obs = Survey.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("Survey._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("Survey._fetchAttributes");

	this.properties = {
	    uparam : "",
	    cname : "Survey",
	    author : "Mel M. Heravi",
	    version : "1.0",
	    iframe : "false",
	    label : "feedback"
	};

	// 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("Survey.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("Survey._process:", data);

	for (var i = 0; i < data.length; i++) {
	    console.log("---", data[i]);
	}

	wc.groupEnd();
    };

    /**
     * Initialize component
     * @private
     * @_initialize
     */
    _initialize() {
	wc.group("Survey._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("Survey._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.restricted();

	wc.groupEnd();
    };

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

	// FREE MEMORY AND CLEANUP

        wc.groupEnd();
    };

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

	// FREE ALL MEMORY
	// you should delete all created objects here

	// FREE POINTER
	delete this;

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

	wc.groupEnd();
    };
}

window.customElements.define('wc-survey', Survey);