Another approach to applying default filter/select settings on render

javascript/src/filter.js

@@ -129,7 +129,7 @@ export class FilterHandle {
    * @param {Object} [extraInfo] - Extra properties to be included on the event
    *   object that's passed to listeners (in addition to any options that were
    *   passed into the `FilterHandle` constructor).
-   * 
+   *
    * @fires FilterHandle#change
    */
   clear(extraInfo) {
@@ -153,7 +153,7 @@ export class FilterHandle {
    * @param {Object} [extraInfo] - Extra properties to be included on the event
    *   object that's passed to listeners (in addition to any options that were
    *   passed into the `FilterHandle` constructor).
-   * 
+   *
    * @fires FilterHandle#change
    */
   set(keys, extraInfo) {
@@ -198,6 +198,14 @@ export class FilterHandle {
     return this._emitter.off(eventType, listener);
   }
 
+  invokeChangeHandler(extraInfo) {
+    const evt = this._mergeExtraInfo(extraInfo);
+    evt.value = this.filteredKeys;
+    evt.oldValue = null;
+
+    this._emitter.trigger("change", evt, this);
+  }
+
   _onChange(extraInfo) {
     if (!this._filterSet)
       return;

javascript/src/selection.js

@@ -158,6 +158,14 @@ export class SelectionHandle {
     return this._emitter.off(eventType, listener);
   }
 
+  invokeChangeHandler(extraInfo) {
+    const evt = this._mergeExtraInfo(extraInfo);
+    evt.value = this.value;
+    evt.oldValue = null;
+
+    this._emitter.trigger("change", evt, this);
+  }
+
   /**
    * Shuts down the `SelectionHandle` object.
    *

javascript/src/util.js

@@ -108,6 +108,10 @@ export class SubscriptionTracker {
     return sub;
   }
 
+  trigger(eventType, arg, thisObj) {
+    this._emitter.trigger(eventType, arg, thisObj);
+  }
+
   removeAllListeners() {
     let current_subs = this._subs;
     this._subs = {};