function replaceURLWithHTMLLinks(text) {
  var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
  return text.replace(exp,"<a href='$1'>$1</a>");
}

$(function connect() {
  sock = new SockJS('/echo');

  sock.onopen = function() {
    console.log('open');
    sock.send('open');
  };
  sock.onmessage = function(e) {
    console.log('message', e.data);
    try {
      var object = JSON.parse(e.data);
      console.log(object.message);
      var safe_message = $('<div/>').text(object.message).html();
      safe_message = replaceURLWithHTMLLinks(safe_message);
  var safe_from = $('<div/>').text(object.from).html();
  $('#chatbox').append('<tr><td class="chat_from">'+safe_from+'</td><td class="chat_msg">'+safe_message+'</td></tr>');

    } catch (error) {
      console.log(error);
    }
  };
  sock.onclose = function(event) {
    console.log('close');
    switch (event.code) {
      case 1006: //abnormal closure
        return setTimeout(connect, 1000);
    };
  };

});
$(function() {
  $("#input").keydown(function(e) {
    if( e.keyCode === 13) {
      e.preventDefault();
      e.stopPropagation();
      e.stopImmediatePropagation();
      sock.send(JSON.stringify({
        message: $('#input').val(),
      }));
      $('#input').val('');
      return;
    }
  });

});