private chat with socket.io

• First add user in chat room so that will easy to find a user in your private chat room

• Your client side code for join private room

  <input type="text" class="form-control" id="user_email" placeholder="user_email"  />
  <button text="join room" class="btn btn-primary btn-block" onclick="a();"> Join Room</button>
  

• your javascript code in client side

  function a(){
      io.emit('privatechatroom', {email:document.getElementById('user_email').value});
  }
  

• your server side code to add user in your room

  socket.on('privatechatroom',function(data){
      socket.join(data.email);
      io.emit('res',{mes:"you are added"})
  });
  

now u can send private message to that person that is recently addedd to this room client side

function b() {
    io.emit('sendmail', { email: document.getElementById('sender_mail').value, message: document.getElementById('message').value });
    $('#message').val('');
}

/*serverside code*/
socket.on('sendmail', function (data) {
    io.sockets.in(data.email).emit('new_msg', { msg: data.message });
    console.log(data.email);
});