From 6262891b5669716db7c46dcdcec685d2f55903b5 Mon Sep 17 00:00:00 2001
From: Javan Makhmali <javan@javan.us>
Date: Thu, 27 Jul 2017 19:47:03 -0400
Subject: Add JavaScript direct upload support (#81)

---
 app/javascript/activestorage/ujs.js | 74 +++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 app/javascript/activestorage/ujs.js

(limited to 'app/javascript/activestorage/ujs.js')

diff --git a/app/javascript/activestorage/ujs.js b/app/javascript/activestorage/ujs.js
new file mode 100644
index 0000000000..a2ce2cfc58
--- /dev/null
+++ b/app/javascript/activestorage/ujs.js
@@ -0,0 +1,74 @@
+import { DirectUploadsController } from "./direct_uploads_controller"
+import { findElement } from "./helpers"
+
+const processingAttribute = "data-direct-uploads-processing"
+let started = false
+
+export function start() {
+  if (!started) {
+    started = true
+    document.addEventListener("submit", didSubmitForm)
+    document.addEventListener("ajax:before", didSubmitRemoteElement)
+  }
+}
+
+function didSubmitForm(event) {
+  handleFormSubmissionEvent(event)
+}
+
+function didSubmitRemoteElement(event) {
+  if (event.target.tagName == "FORM") {
+    handleFormSubmissionEvent(event)
+  }
+}
+
+function handleFormSubmissionEvent(event) {
+  const form = event.target
+
+  if (form.hasAttribute(processingAttribute)) {
+    event.preventDefault()
+    return
+  }
+
+  const controller = new DirectUploadsController(form)
+  const { inputs } = controller
+
+  if (inputs.length) {
+    event.preventDefault()
+    form.setAttribute(processingAttribute, "")
+    inputs.forEach(disable)
+    controller.start(error => {
+      form.removeAttribute(processingAttribute)
+      if (error) {
+        inputs.forEach(enable)
+      } else {
+        submitForm(form)
+      }
+    })
+  }
+}
+
+function submitForm(form) {
+  let button = findElement(form, "input[type=submit]")
+  if (button) {
+    const { disabled } = button
+    button.disabled = false
+    button.click()
+    button.disabled = disabled
+  } else {
+    button = document.createElement("input")
+    button.type = "submit"
+    button.style = "display:none"
+    form.appendChild(button)
+    button.click()
+    form.removeChild(button)
+  }
+}
+
+function disable(input) {
+  input.disabled = true
+}
+
+function enable(input) {
+  input.disabled = false
+}
-- 
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