Bugfixes, dialog improvements

* It is now possible to pass an element as the dialog message to have it inserted as the body.

jsonform.js

@@ -119,6 +119,7 @@ class FormRow {
     updateModel(model) {
         this.#fields.forEach(field => {
             if (!field.options.path) return;
+            field.value = field.getValue();
             model = jsonPatch(model, field.options.path, field.value);
         });
         return model;
@@ -206,9 +207,14 @@ class TextField extends FormField {
         this.#input.innerText = this.value;
     }
     valueUpdated() {
+        if (!this.#input) return;
         this.#input.innerText = this.value;        
     }
     getValue() {
+        if (this.#input.innerText === '') {
+            if (this.options.nullable !== false)
+                return null;
+        }
         return this.#input.innerText;
     }
     setEditable(state) {
@@ -231,9 +237,17 @@ class NumericField extends FormField {
         this.#input.innerText = this.value;
     }
     valueUpdated() {
+        if (!this.#input) return;
         this.#input.innerText = this.value;
     }
     getValue() {
+        if (this.#input.innerText === '') {
+            if (this.options.nullable !== false)
+                return null;
+        }
+        if (this.options.fixed && typeof this.options.fixed == 'number') {
+            return parseFloat(this.#input.innerText).toFixed(this.options.fixed);
+        }
         if (this.options.float) {
             return parseFloat(this.#input.innerText);
         }