Lots of changes and additions to the project. Still early, and not usable.

client/AdminMgmt/CategoryMgMt/catMgmtForm.js

@@ -0,0 +1,39 @@
+import { Categories } from '../../../imports/api/category.js';
+
+Template.catMgmtForm.onCreated(function() {
+    this.subscribe("myCategories");
+});
+
+Template.catMgmtForm.onRendered(function() {
+    Session.set("catNameMiss", false);
+});
+
+Template.catMgmtForm.helpers({
+    catNameErr: function() {
+        return Session.get("catNameMiss");
+    },
+});
+
+Template.catMgmtForm.events({
+    'click .saveCatMgmt' (event) {
+        event.preventDefault();
+        let catName = $("#catNameInp").val();
+        if (catName == null || catName == "") {
+            Session.set("catNameMiss", true);
+            return;
+        } else {
+            Meteor.call('add.category', catName, function(err, result) {
+                if (err) {
+                    // console.log("    ERROR: Can't add category: " + err);
+                } else {
+                    // console.log("    SUCCESS adding category.");
+                    $("#catNameInp").val("");
+                }
+            });
+        }
+    },
+    'click .cancelCatMgmt' (event) {
+        event.preventDefault();
+        $("#catNameInp").val("");
+    }
+});