Function toggleButton

web/src/index.js:385–391

()

 // Enables or disables the submit button depending on the values of the input
 // fields.
 function toggleButton() {
   if (messageInputElement.value) {
     submitButtonElement.removeAttribute('disabled');
   } else {
     submitButtonElement.setAttribute('disabled', 'true');
   }
 }
 
 // Shortcuts to DOM Elements.
 var messageListElement = document.getElementById('messages');