WIP on OpenGraph form; add media files (#52)

src/admin-theme/wwwroot/admin.js

@@ -232,10 +232,29 @@ this.Admin = {
    */
   toggleOpenGraphFields() {
     const disabled = !document.getElementById("AssignOpenGraph").checked
-    let fieldsets = ["og_item"]
+    let fieldsets = ["og_item", "og_image", "og_audio", "og_video"]
     fieldsets.forEach(it => document.getElementById(it).disabled = disabled)
   },
 
+  /**
+   * Disable the file upload or path field if the other is entered
+   * @param {string} pathElt The path element to check
+   * @param {string} fileElt The file element to check
+   */
+  pathOrFile(pathElt, fileElt) {
+    /** @type {HTMLInputElement} */
+    const path = document.getElementById(pathElt)
+    /** @type {HTMLInputElement} */
+    const file = document.getElementById(fileElt)
+    if (path.value.length > 0) {
+      file.disabled = true
+    } else if (file.value.length > 0) {
+      path.disabled = true
+    } else {
+      file.disabled = path.disabled = false
+    }
+  },
+
   /**
    * Enable or disable podcast fields
    */