/**
* Websocket Component<BR>
* <BR><BR><img src=/tk/lib/components/w/img/ws.png width=30% style="border:1px lime dashed;padding:20px">
* <BR><BR><a href="/tk/lib/components/w/html/ws.html">DEMO</a>
*/
class WS extends HTMLElement {
constructor() {
wc.group("WS.constructor")
super();
wc.groupEnd();
};
/**
* Set observable values here. When Changed, attributeChangedCallback is invoked
* @observedAttributes
*/
static get observedAttributes() {
wc.group("WS.observedAttributes");
this.observables = [];
wc.groupEnd();
return this.observables;
};
/**
* Called when this is attached to DOM
* @connectedCallback.
*/
connectedCallback() {
wc.group("WS.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();
// ADD COMPONENT MARKTOP
this.innerHTML = this._template()
this.start();
// 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();
};
/**
* Initial Markup
* @private
* @_template
*/
_template() {
wc.group("WS.template");
var temp = this.dom.content;
wc.groupEnd();
return temp;
};
/**
* Called with .setAttribute(...) function call
* @attributeChangedCallback
*/
attributeChangedCallback(attr, oldval, newval) {
wc.group("WS.attributeChangedCallback:", attr, oldval, newval);
this.properties = this.properties || [];
let obs = WS.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("WS._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("WS._fetchAttributes");
this.properties = {
uparam : "",
cname : "ws",
author : "Mel M. Heravi, Ph.D.",
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 "header":
break;
default:
break;
}
}
wc.log("ATTRIBUTES: ", this.properties);
wc.groupEnd();
};
/**
* Initialize component
* @private
* @_initialize
*/
_initialize() {
wc.group("WS._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("WS._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("WS.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("WS.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();
};
/**
* Start the instance object and artifacts
* @start
*/
start() {
wc.group("WS.start");
let self = this;
window.ws = new WebSocket(this.properties.url);
////////////////////////////////////////////////////////////
////
////////////////////////////////////////////////////////////
ws.onopen = () => {
wc.group("ws.onopen");
let time = new Date().getTime();
ws.send("ping")
wc.publish("wc-websocket", {
time: new Date().getTime(),
type: "info",
msg: "CONNECTED",
id: self.id
});
wc.groupEnd();
}
////////////////////////////////////////////////////////////
////
////////////////////////////////////////////////////////////
ws.onerror = (error) => {
wc.group("ws.onerror");
var msg = "UNKNOWN ERROR..."
if (error.target.readyState == 3) {
msg = `DISCONNECTED. will try again in ${this.properties.reconnect/1000} seconds...`
}
wc.error("C ERROR:", error.target.readyState, msg)
wc.publish("wc-websocket", {
time: new Date().getTime(),
type: "error",
msg: msg,
id: self.id
});
wc.groupEnd();
}
////////////////////////////////////////////////////////////
////
////////////////////////////////////////////////////////////
ws.onmessage = (e) => {
wc.group("ws.onmessage");
let msg = e.data;
let x = msg.split(" ");
switch(x[0])
{
case "pong":
wc.log(`C < ${msg}`);
wc.publish("wc-websocket", {
time: new Date().getTime(),
type: "msg",
msg: msg,
id: self.id
});
break;
default:
let error = `ERROR: DO NOT UNDERSTAND COMMAND: ${msg}`;
wc.error(error);
wc.publish("wc-websocket", {
time: new Date().getTime(),
type: "error",
msg: error,
id: self.id
});
break;
}
// CONFIRM
ws.send("ready");
wc.groupEnd();
}
////////////////////////////////////////////////////////////
//// RESTART IF DISCONNECTED
////////////////////////////////////////////////////////////
ws.onclose = function(e) {
wc.group("ws.onclose");
wc.log("DISCONNECTED!");
wc.publish("wc-websocket", {
time: new Date().getTime(),
type: "info",
msg: "CONNECTION CLOSED",
id: self.id
});
setTimeout(() => {
self.start()
}, self.properties.reconnect);
wc.groupEnd();
};
wc.groupEnd();
}
}
window.customElements.define('wc-websocket', WS);