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 (function(){
   6     "use strict";
   7
   8     // Fallback for all uncought errors
   9     function handleError (event, err) {
  10         try {
  11             const msg = document.getElementById('noVNC_fallback_errormsg');
  12
  13             // Only show the initial error
  14             if (msg.hasChildNodes()) {
  15                 return false;
  16             }
  17
  18             let div = document.createElement("div");
  19             div.classList.add('noVNC_message');
  20             div.appendChild(document.createTextNode(event.message));
  21             msg.appendChild(div);
  22
  23             if (event.filename) {
  24                 div = document.createElement("div");
  25                 div.className = 'noVNC_location';
  26                 let text = event.filename;
  27                 if (event.lineno !== undefined) {
  28                     text += ":" + event.lineno;
  29                     if (event.colno !== undefined) {
  30                         text += ":" + event.colno;
  31                     }
  32                 }
  33                 div.appendChild(document.createTextNode(text));
  34                 msg.appendChild(div);
  35             }
  36
  37             if (err && err.stack) {
  38                 div = document.createElement("div");
  39                 div.className = 'noVNC_stack';
  40                 div.appendChild(document.createTextNode(err.stack));
  41                 msg.appendChild(div);
  42             }
  43
  44             document.getElementById('noVNC_fallback_error')
  45                 .classList.add("noVNC_open");
  46         } catch (exc) {
  47             document.write("noVNC encountered an error.");
  48         }
  49         // Don't return true since this would prevent the error
  50         // from being printed to the browser console.
  51         return false;
  52     }
  53     window.addEventListener('error', function (evt) { handleError(evt, evt.error); });
  54     window.addEventListener('unhandledrejection', function (evt) { handleError(evt.reason, evt.reason); });
  55 })();