app/error-handler.js

   1 // NB: this should *not* be included as a module until we have
   2 // native support in the browsers, so that our error handler
   3 // can catch script-loading errors.
   4
   5 // No ES6 can be used in this file since it's used for the translation
   6 /* eslint-disable prefer-arrow-callback */
   7
   8 (function() {
   9     "use strict";
  10
  11     // Fallback for all uncought errors
  12     function handleError (event, err) {
  13         try {
  14             const msg = document.getElementById('noVNC_fallback_errormsg');
  15
  16             // Only show the initial error
  17             if (msg.hasChildNodes()) {
  18                 return false;
  19             }
  20
  21             let div = document.createElement("div");
  22             div.classList.add('noVNC_message');
  23             div.appendChild(document.createTextNode(event.message));
  24             msg.appendChild(div);
  25
  26             if (event.filename) {
  27                 div = document.createElement("div");
  28                 div.className = 'noVNC_location';
  29                 let text = event.filename;
  30                 if (event.lineno !== undefined) {
  31                     text += ":" + event.lineno;
  32                     if (event.colno !== undefined) {
  33                         text += ":" + event.colno;
  34                     }
  35                 }
  36                 div.appendChild(document.createTextNode(text));
  37                 msg.appendChild(div);
  38             }
  39
  40             if (err && err.stack) {
  41                 div = document.createElement("div");
  42                 div.className = 'noVNC_stack';
  43                 div.appendChild(document.createTextNode(err.stack));
  44                 msg.appendChild(div);
  45             }
  46
  47             document.getElementById('noVNC_fallback_error')
  48                 .classList.add("noVNC_open");
  49         } catch (exc) {
  50             document.write("noVNC encountered an error.");
  51         }
  52         // Don't return true since this would prevent the error
  53         // from being printed to the browser console.
  54         return false;
  55     }
  56     window.addEventListener('error', function (evt) { handleError(evt, evt.error); });
  57     window.addEventListener('unhandledrejection', function (evt) { handleError(evt.reason, evt.reason); });
  58 })();