--- a/svghmi/widgets_common.ysl2	Thu Aug 13 11:30:18 2020 +0200
+++ b/svghmi/widgets_common.ysl2	Thu Aug 13 11:37:39 2020 +0200
@@ -158,18 +158,12 @@
         }
 
         apply_cache() {
-            let dispatch = this.dispatch;
-            if(dispatch == undefined) return;
             if(!this.unsubscribable) for(let index in this.indexes){
                 /* dispatch current cache in newly opened page widgets */
                 let realindex = this.get_variable_index(index);
                 let cached_val = cache[realindex];
                 if(cached_val != undefined)
-                    try {
-                        dispatch.call(this, cached_val, cached_val, index);
-                    } catch(err) {
-                        console.log(err);
-                    }
+                    this._dispatch(cached_val, cached_val, index);
             }
         }
 
@@ -194,22 +188,27 @@
 
         new_hmi_value(index, value, oldval) {
             // TODO avoid searching, store index at sub()
-            let dispatch = this.dispatch;
-            if(dispatch == undefined) return;
             for(let i = 0; i < this.indexes.length; i++) {
                 let refindex = this.get_variable_index(i);
 
                 if(index == refindex) {
-                    try {
-                        dispatch.call(this, value, oldval, i);
-                    } catch(err) {
-                        console.log(err);
-                    }
+                    this._dispatch(value, oldval, i);
                     break;
                 }
             }
         }
         
+        _dispatch(value, oldval, varnum) {
+            let dispatch = this.dispatch;
+            if(dispatch != undefined){
+                try {
+                    dispatch.call(this, value, oldval, varnum);
+                } catch(err) {
+                    console.log(err);
+                }
+            }
+        }
+
         _animate(){
             this.animate();
             this.pending_animate = false;