$(function () {
    "use strict";

    window.chatwoot = {};
    // update the inbox identifier
    chatwoot.inboxIdentifier = "z1URF1eFBbE14cyLGg7AHBdN";
    chatwoot.chatwootAPIUrl = "http://localhost:3000/public/api/v1/"

    // for better performance - to avoid searching in DOM
    var content = $('#content');
    var input = $('#input');
    var status = $('#status');
    var xhttp = new XMLHttpRequest();


    // if user is running mozilla then use it's built-in WebSocket
    window.WebSocket = window.WebSocket || window.MozWebSocket;

    // if browser doesn't support WebSocket, just show some notification and exit
    if (!window.WebSocket) {
        content.html($('<p>', { text: 'Sorry, but your browser doesn\'t '
                                    + 'support WebSockets.'} ));
        input.hide();
        $('span').hide();
        return;
    }

    // open connection
    var connection = new WebSocket('ws://localhost:3000/cable');

    connection.onopen = function () {
        // check whether we have a pubsub token and contact identifier or else set one
        setUpContact();
        setUpConversation();
 
        // first we want users to subscribe to the chatwoot webhooks
        connection.send(JSON.stringify({command:"subscribe", identifier: "{\"channel\":\"RoomChannel\",\"pubsub_token\":\""+chatwoot.contactPubsubToken+"\"}" }));
        input.removeAttr('disabled');
        status.text('Send Message:');
    };

    connection.onerror = function (error) {
        // just in there were some problems with connection...
        content.html($('<p>', { text: 'Sorry, but there\'s some problem with your '
                                    + 'connection or the server is down.' } ));
    };

    // most important part - incoming messages
    connection.onmessage = function (message) {
        // try to parse JSON message. Because we know that the server always returns
        // JSON this should work without any problem but we should make sure that
        // the massage is not chunked or otherwise damaged.
        try {
            var json = JSON.parse(message.data);
        } catch (e) {
            console.log('This doesn\'t look like a valid JSON: ', message.data);
            return;
        }
 
        if (json.type === 'welcome') { 
          // lets ignore the welcome
        } else if (json.type === 'ping') {
          // lets ignore the pings
        } else if (json.type === 'confirm_subscription') {
          // lets ignore the confirmation
        }else if (json.message.event === 'message.created') {
          console.log('here comes message', json);
          if(json.message.data.message_type === 1)
          { 
            addMessage(json.message.data.sender.name, json.message.data.content); 
          }
        } else {
          console.log('Hmm..., I\'ve never seen JSON like this: ', json);
        }
    };

    /**
     * Send mesage when user presses Enter key
     */
    input.keydown(function(e) {
        if (e.keyCode === 13) {
            var msg = $(this).val();
            if (!msg) {
                return;
            }
            // send the message to chatwoot
            //connection.send(msg);
            sendMessage(msg);
            addMessage("me", msg)
            $(this).val('');
        }
    });

    /**
     * This method is optional. If the server wasn't able to respond to the
     * in 3 seconds then show some error message to notify the user that
     * something is wrong.
     */
    setInterval(function() {
        if (connection.readyState !== 1) {
            status.text('Error');
            input.attr('disabled', 'disabled').val('Unable to communicate '
                                                 + 'with the WebSocket server.');
        }
    }, 3000);

    /**
     * Add message to the chat window
     */
    function addMessage(author, message) {
        content.append('<p><span>' + author + '</span> @ ' + ':' +  message + '</p>');
        content.scrollTop(1000000);
    }

    function setUpContact() {
      if(getCookie('contactIdentifier')){
        chatwoot.contactIdentifier = getCookie('contactIdentifier');
        chatwoot.contactPubsubToken = getCookie('contactPubsubToken')
      }else{
        xhttp.open("POST", chatwoot.chatwootAPIUrl + "inboxes/"+chatwoot.inboxIdentifier+"/contacts");
        xhttp.send();
        var contactPubsubToken = JSON.parse(xhttp.responseText).pubsub_token;
        var contactIdentifier = JSON.parse(xhttp.responseText).source_id;
        setCookie('contactIdentifier',contactIdentifier,30);
        setCookie('contactPubsubToken',contactPubsubToken,30);
      }
    }

    function setUpConversation() {
      if(getCookie('contactConverstion')){
        chatwoot.contactConverstion = getCookie('contactConverstion');
      }else{
        xhttp.open("POST", chatwoot.chatwootAPIUrl + "inboxes/"+chatwoot.inboxIdentifier+"/contacts/"+chatwoot.contactIdentifier+"/conversations", false);
        xhttp.send();
        var contactConverstion = JSON.parse(xhttp.responseText).id;
        setCookie('contactConverstion',contactConverstion,30);
      }
    }

    function sendMessage(msg){
      xhttp.open("POST", chatwoot.chatwootAPIUrl + "inboxes/"+chatwoot.inboxIdentifier+"/contacts/"+chatwoot.contactIdentifier+"/conversations/"+chatwoot.contactConverstion+"/messages", false);
      xhttp.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
      xhttp.send(JSON.stringify({content: msg}));
    }

    function setCookie(name,value,days) {
        var expires = "";
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days*24*60*60*1000));
            expires = "; expires=" + date.toUTCString();
        }
        document.cookie = name + "=" + (value || "")  + expires + "; path=/";
    }
    function getCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for(var i=0;i < ca.length;i++) {
            var c = ca[i];
            while (c.charAt(0)==' ') c = c.substring(1,c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
    }
    function eraseCookie(name) {   
        document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
    }
});

Javascript Online Compiler

Write, Run & Share Javascript code online using OneCompiler's JS online compiler for free. It's one of the robust, feature-rich online compilers for Javascript language. Getting started with the OneCompiler's Javascript editor is easy and fast. The editor shows sample boilerplate code when you choose language as Javascript and start coding.

About Javascript

Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.

Key Features

  • Open-source
  • Just-in-time compiled language
  • Embedded along with HTML and makes web pages alive
  • Originally named as LiveScript.
  • Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.

Syntax help

STDIN Example

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function(line){
    console.log("Hello, " + line);
});

variable declaration

KeywordDescriptionScope
varVar is used to declare variables(old way of declaring variables)Function or global scope
letlet is also used to declare variables(new way)Global or block Scope
constconst is used to declare const values. Once the value is assigned, it can not be modifiedGlobal or block Scope

Backtick Strings

Interpolation

let greetings = `Hello ${name}`

Multi line Strings

const msg = `
hello
world!
`

Arrays

An array is a collection of items or values.

Syntax:

let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);

Example:

let mobiles = ["iPhone", "Samsung", "Pixel"];

// accessing an array
console.log(mobiles[0]);

// changing an array element
mobiles[3] = "Nokia";

Arrow functions

Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.

Syntax:

() => expression

Example:

const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
                                    .map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);

De-structuring

Arrays

let [firstName, lastName] = ['Foo', 'Bar']

Objects

let {firstName, lastName} = {
  firstName: 'Foo',
  lastName: 'Bar'
}

rest(...) operator

 const {
    title,
    firstName,
    lastName,
    ...rest
  } = record;

Spread(...) operator

//Object spread
const post = {
  ...options,
  type: "new"
}
//array spread
const users = [
  ...adminUsers,
  ...normalUsers
]

Functions

function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
  console.log(`Hello ${name}!`);
}
 
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar

Loops

1. If:

IF is used to execute a block of code based on a condition.

Syntax

if(condition){
    // code
}

2. If-Else:

Else part is used to execute the block of code when the condition fails.

Syntax

if(condition){
    // code
} else {
    // code
}

3. Switch:

Switch is used to replace nested If-Else statements.

Syntax

switch(condition){
    case 'value1' :
        //code
        [break;]
    case 'value2' :
        //code
        [break;]
    .......
    default :
        //code
        [break;]
}

4. For

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
//code  
}

5. While

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
  // code 
}

6. Do-While

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
  // code 
} while (condition);

Classes

ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.

Syntax:

class className {
  constructor() { ... } //Mandatory Class method
  method1() { ... }
  method2() { ... }
  ...
}

Example:

class Mobile {
  constructor(model) {
    this.name = model;
  }
}

mbl = new Mobile("iPhone");