feat(javascripts): add application

examples/blog/app/assets/javascripts/application.js

@@ -0,0 +1,12 @@
+// Rails-UJS-lite: any element with a data-confirm attribute (button_to
+// destroy links generate one, see app/views/posts/_post.erb) pops a native
+// confirm() dialog before its click is allowed to reach the form submit;
+// cancelling the dialog cancels the click.
+document.addEventListener("click", function (event) {
+  var target = event.target.closest("[data-confirm]");
+  if (!target) return;
+  if (!window.confirm(target.getAttribute("data-confirm"))) {
+    event.preventDefault();
+    event.stopPropagation();
+  }
+});