primo commit

media/com_banners/joomla.asset.json

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+{
+  "$schema": "https://developer.joomla.org/schemas/json-schema/web_assets.json",
+  "name": "com_banners",
+  "version": "4.0.0",
+  "description": "Joomla CMS",
+  "license": "GPL-2.0-or-later",
+  "assets": [
+    {
+      "name": "com_banners.admin-banner-edit",
+      "type": "script",
+      "uri": "com_banners/admin-banner-edit.min.js",
+      "dependencies": [
+        "core"
+      ],
+      "attributes": {
+        "type": "module"
+      },
+      "version": "c414d8"
+    }
+  ]
+}

media/com_banners/js/admin-banner-edit.js

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+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+(document => {
+
+  const updateBannerFields = value => {
+    const imgWrapper = document.getElementById('image');
+    const custom = document.getElementById('custom');
+    switch (value) {
+      case '0':
+        // Image
+        imgWrapper.classList.remove('hidden');
+        custom.classList.add('hidden');
+        break;
+      case '1':
+        // Custom
+        imgWrapper.classList.add('hidden');
+        custom.classList.remove('hidden');
+        break;
+      // Do nothing
+    }
+  };
+  document.addEventListener('DOMContentLoaded', () => {
+    const jformType = document.getElementById('jform_type');
+    if (jformType) {
+      // Hide/show parameters initially
+      updateBannerFields(jformType.value);
+
+      // Hide/show parameters when the type has been selected
+      jformType.addEventListener('change', ({
+        target
+      }) => {
+        updateBannerFields(target.value);
+      });
+    }
+  });
+})(document);

media/com_banners/js/admin-banner-edit.min.js

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+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */(s=>{const d=e=>{const t=s.getElementById("image"),a=s.getElementById("custom");switch(e){case"0":t.classList.remove("hidden"),a.classList.add("hidden");break;case"1":t.classList.add("hidden"),a.classList.remove("hidden");break}};s.addEventListener("DOMContentLoaded",()=>{const e=s.getElementById("jform_type");e&&(d(e.value),e.addEventListener("change",({target:t})=>{d(t.value)}))})})(document);