changes

rust/js/app.js

@@ -9,3 +9,11 @@ window.onload = function() {
 function is_positive_integer(val) {
     return /^\d+$/.test(val);
 }
+
+function inventory_new_item_check_input() {
+    return document.getElementById('new-item-name').value.length != 0
+    && is_positive_integer(document.getElementById('new-item-weight').value)
+}
+function check_weight() {
+    return document.getElementById('new-item-weight').validity.valid;
+}