Fix channels bug when VuFind configured at site root. (#1541)

- Resolves VUFIND-1377.

themes/bootstrap3/js/common.js

@@ -163,10 +163,10 @@ function getUrlRoot(url) {
   var urlroot = null;
   var urlParts = url.split(/[?#]/);
   var urlWithoutFragment = urlParts[0];
-  if (VuFind.path === '') {
+  if (VuFind.path === '' || VuFind.path === '/') {
     // special case -- VuFind installed at site root:
     var chunks = urlWithoutFragment.split('/');
-    urlroot = '/' + chunks[3] + '/' + chunks[4];
+    urlroot = '/' + chunks[1] + '/' + chunks[2];
   } else {
     // standard case -- VuFind has its own path under site:
     var slashSlash = urlWithoutFragment.indexOf('//');