1 files changed, 42 insertions, 0 deletions
diff --git a/activestorage/app/javascript/activestorage/helpers.js b/activestorage/app/javascript/activestorage/helpers.js
new file mode 100644
index 0000000000..52fec8f6f1
--- /dev/null
+++ b/activestorage/app/javascript/activestorage/helpers.js
@@ -0,0 +1,42 @@
+export function getMetaValue(name) {
+  const element = findElement(document.head, `meta[name="${name}"]`)
+  if (element) {
+    return element.getAttribute("content")
+  }
+}
+
+export function findElements(root, selector) {
+  if (typeof root == "string") {
+    selector = root
+    root = document
+  }
+  const elements = root.querySelectorAll(selector)
+  return toArray(elements)
+}
+
+export function findElement(root, selector) {
+  if (typeof root == "string") {
+    selector = root
+    root = document
+  }
+  return root.querySelector(selector)
+}
+
+export function dispatchEvent(element, type, eventInit = {}) {
+  const { bubbles, cancelable, detail } = eventInit
+  const event = document.createEvent("Event")
+  event.initEvent(type, bubbles || true, cancelable || true)
+  event.detail = detail || {}
+  element.dispatchEvent(event)
+  return event
+}
+
+export function toArray(value) {
+  if (Array.isArray(value)) {
+    return value
+  } else if (Array.from) {
+    return Array.from(value)
+  } else {
+    return [].slice.call(value)
+  }
+}