var chatWrapper = document.getElementsByClassName('chat-wrapper')[0]

  , goButton = document.getElementById('go')

  , groupInput = document.getElementById('chat-group')

  , fromInput = document.getElementById('chat-from')

  , toInput = document.getElementById('chat-to');

​

goButton.addEventListener('click', e => {

  var chatFrom = parseInt(fromInput.value)

    , chatTo = parseInt(toInput.value)

    , chatGroup = groupInput.value;

​

  chatWrapper.innerHTML='';

​

  for(var chatIndex = chatFrom; chatIndex <= chatTo; chatIndex++) {

    var embededChat = document.createElement('blockquote');

    embededChat.dataset.telegramPost = `${chatGroup}/${chatIndex}`;

    embededChat.classList.add('telegram-post');

    embededChat.dataset.width = '100%';

    chatWrapper.appendChild(embededChat); 

  }

  var chatScript = document.createElement('script');

  chatScript.src = 'https://telegram.org/js/telegram-widget.js';

  chatScript.setAttribute('async', '');

  chatWrapper.appendChild(chatScript);

});

​