Button disabling/enabling

Closes #10

app/javascript/application.js

@@ -2,6 +2,24 @@
 import "@hotwired/turbo-rails"
 
 function showPage(event) {
-  document.documentElement.style.visibility="visible";
+  document.documentElement.style.visibility="visible"
+}
+document.addEventListener('turbo:load', showPage)
+
+
+Turbo.StreamActions.disable = function() {
+  this.targetElements.forEach((e) => {
+    e.setAttribute("disabled", "disabled")
+    e.setAttribute("aria-disabled", "true")
+    e.setAttribute("tabindex", "-1")
+  })
+}
+
+Turbo.StreamActions.enable = function() {
+  this.targetElements.forEach((e) => {
+    e.removeAttribute("disabled")
+    e.removeAttribute("aria-disabled")
+    // 'tabindex' is not used explicitly, so removing it is safe
+    e.removeAttribute("tabindex")
+  })
 }
-document.addEventListener('turbo:load', showPage);