Add canSave to the form mixin to toggle whether or not the Next button is disabled

js/mixins/form.js

@@ -44,6 +44,18 @@ export default {
     },
   },
 
+  computed: {
+    canSave: function() {
+      if (!this.invalid) {
+        return true
+      } else if (this.changed && !this.invalid) {
+        return true
+      } else {
+        return false
+      }
+    },
+  },
+
   data: function() {
     return {
       changed: this.hasChanges,

templates/task_orders/builder_base.html

@@ -13,7 +13,7 @@
             <input
               type="submit"
               tabindex="0"
-              :disabled="!changed"
+              :disabled="!canSave"
               value="{{ next_button_text }}"
               form="to_form"
               class="usa-button usa-button-primary">