add feature detect

1 files changed, 29 insertions, 0 deletions

diff --git a/public/javascripts/featureDetect.js b/public/javascripts/featureDetect.js
new file mode 100644
index 0000000..3a072a1
--- /dev/null
+++ b/public/javascripts/featureDetect.js
@@ -0,0 +1,29 @@
+/* global FLAGS */
+
+const self = {}
+
+self._nodes = {
+  input: document.querySelector('input[type="search"]'),
+  overflowButton: document.querySelector('#overflow-button')
+}
+
+self._shouldCheck = function () {
+  return FLAGS.indexOf('NO_FEATURE_DETECT') === -1
+}
+
+self._redirect = function () {
+  window.location.href = 'http://www.meetingpointmco.nl/Roosters-AL/doc/'
+}
+
+self.check = function () {
+  if (!self._shouldCheck()) return
+
+  window.onerror = self._redirect
+
+  if (self._nodes.input.getClientRects()[0].top !==
+      self._nodes.overflowButton.getClientRects()[0].top) {
+    self._redirect()
+  }
+}
+
+module.exports = self