--- a/svghmi/widget_keypad.ysl2	Thu Aug 20 14:12:49 2020 +0200
+++ b/svghmi/widget_keypad.ysl2	Fri Aug 21 13:22:54 2020 +0200
@@ -88,9 +88,15 @@
          }
 
          on_Enter_click() {
-             end_modal.call(this);
-             let callback_obj = this.result_callback_obj;
-             callback_obj.edit_callback(this.editstr);
+             let coercedval = (typeof this.initial) == "number" ? Number(this.editstr) : this.editstr;
+             if(isNaN(coercedval)){
+                 this.editstr = String(this.initial);
+                 this.update();
+             } else { // revert to initial so it explicitely shows input was ignored
+                 let callback_obj = this.result_callback_obj;
+                 end_modal.call(this);
+                 callback_obj.edit_callback(coercedval);
+             }
          }
 
          on_BackSpace_click() {
@@ -137,11 +143,13 @@
          result_callback_obj = undefined;
          start_edit(info, valuetype, callback_obj, initial,size) {
              show_modal.call(this,size);
-             this.editstr = initial;
+             this.editstr = String(initial);
              this.result_callback_obj = callback_obj;
              this.Info_elt.textContent = info;
              this.shift = false;
              this.caps = false;
+             this.initial = initial;
+
              this.update();
          }