1 files changed, 35 insertions, 0 deletions
diff --git a/articles/ui/figs/taler-presence.js b/articles/ui/figs/taler-presence.js
new file mode 100644
index 000000000..2301bd27d
--- /dev/null
+++ b/articles/ui/figs/taler-presence.js
@@ -0,0 +1,35 @@
+function handleInstall() {
+  var show = document.getElementsByClassName("taler-installed-show");
+  var hide = document.getElementsByClassName("taler-installed-hide");
+  for (var i = 0; i < show.length; i++) {
+    show[i].style.display = "";
+  }
+  for (var i = 0; i < hide.length; i++) {
+    hide[i].style.display = "none";
+  }
+};
+
+function handleUninstall() {
+  var show = document.getElementsByClassName("taler-installed-show");
+  var hide = document.getElementsByClassName("taler-installed-hide");
+  for (var i = 0; i < show.length; i++) {
+    show[i].style.display = "none";
+  }
+  for (var i = 0; i < hide.length; i++) {
+    hide[i].style.display = "";
+  }
+};
+
+function probeTaler() {
+  var eve = new Event("taler-probe");
+  document.dispatchEvent(eve);
+};
+
+function initTaler() {
+  handleUninstall(); probeTaler();
+};
+
+document.addEventListener("taler-wallet-present", handleInstall, false);
+document.addEventListener("taler-unload", handleUninstall, false);
+document.addEventListener("taler-load", handleInstall, false);
+window.addEventListener("load", initTaler, false);