fix(composite): selected row count always 0 on mass-selected, fix #951

- fixes #951
- add dispose method to container service to start with a blank array whenever we route to another page, this is to avoid reusing already disposed services that might still be in the container service

src/app/modules/angular-slickgrid/components/angular-slickgrid.component.ts

@@ -306,6 +306,7 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
     this.groupingService = externalServices?.groupingAndColspanService ?? new GroupingAndColspanService(this.extensionUtility, this._eventPubSubService);
 
     this.serviceList = [
+      this.containerService,
       this.extensionService,
       this.filterService,
       this.gridEventService,
@@ -423,6 +424,7 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
     this.datasetHierarchical = undefined;
     this._columnDefinitions = [];
     this._angularGridInstances = undefined;
+    this.slickGrid = undefined as any;
   }
 
   emptyGridContainerElm() {
@@ -556,8 +558,7 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
 
       // if you don't want the items that are not visible (due to being filtered out or being on a different page)
       // to stay selected, pass 'false' to the second arg
-      const selectionModel = this.slickGrid?.getSelectionModel();
-      if (selectionModel && this.gridOptions && this.gridOptions.dataView && this.gridOptions.dataView.hasOwnProperty('syncGridSelection')) {
+      if (this.slickGrid?.getSelectionModel() && this.gridOptions && this.gridOptions.dataView && this.gridOptions.dataView.hasOwnProperty('syncGridSelection')) {
         // if we are using a Backend Service, we will do an extra flag check, the reason is because it might have some unintended behaviors
         // with the BackendServiceApi because technically the data in the page changes the DataView on every page change.
         let preservedRowSelectionWithBackend = false;
@@ -884,29 +885,28 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
         // When data changes in the DataView, we need to refresh the metrics and/or display a warning if the dataset is empty
         this._eventHandler.subscribe(dataView.onRowCountChanged, () => {
           grid.invalidate();
-          this.handleOnItemCountChanged(this.dataView.getFilteredItemCount() || 0, dataView.getItemCount());
+          this.handleOnItemCountChanged(dataView.getFilteredItemCount() || 0, dataView.getItemCount() || 0);
         });
         this._eventHandler.subscribe(dataView.onSetItemsCalled, (_e, args) => {
-          grid.invalidate();
-          this.handleOnItemCountChanged(this.dataView.getFilteredItemCount(), args.itemCount);
+          this.handleOnItemCountChanged(dataView.getFilteredItemCount() || 0, args.itemCount);
 
           // when user has resize by content enabled, we'll force a full width calculation since we change our entire dataset
           if (args.itemCount > 0 && (this.gridOptions.autosizeColumnsByCellContentOnFirstLoad || this.gridOptions.enableAutoResizeColumnsByCellContent)) {
             this.resizerService.resizeColumnsByCellContent(!this.gridOptions?.resizeByContentOnlyOnFirstLoad);
           }
         });
 
-        this._eventHandler.subscribe(dataView.onRowsChanged, (_e, args) => {
-          // filtering data with local dataset will not always show correctly unless we call this updateRow/render
-          // also don't use "invalidateRows" since it destroys the entire row and as bad user experience when updating a row
-          // see commit: https://github.com/ghiscoding/aurelia-slickgrid/commit/8c503a4d45fba11cbd8d8cc467fae8d177cc4f60
-          if (gridOptions?.enableFiltering && !gridOptions.enableRowDetailView) {
+        if (gridOptions?.enableFiltering && !gridOptions.enableRowDetailView) {
+          this._eventHandler.subscribe(dataView.onRowsChanged, (_e, args) => {
+            // filtering data with local dataset will not always show correctly unless we call this updateRow/render
+            // also don't use "invalidateRows" since it destroys the entire row and as bad user experience when updating a row
+            // see commit: https://github.com/ghiscoding/aurelia-slickgrid/commit/8c503a4d45fba11cbd8d8cc467fae8d177cc4f60
             if (args?.rows && Array.isArray(args.rows)) {
               args.rows.forEach((row: number) => grid.updateRow(row));
               grid.render();
             }
-          }
-        });
+          });
+        }
       }
     }
 
@@ -1150,9 +1150,8 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
   private loadRowSelectionPresetWhenExists() {
     // if user entered some Row Selections "presets"
     const presets = this.gridOptions?.presets;
-    const selectionModel = this.slickGrid?.getSelectionModel();
     const enableRowSelection = this.gridOptions && (this.gridOptions.enableCheckboxSelector || this.gridOptions.enableRowSelection);
-    if (enableRowSelection && selectionModel && presets && presets.rowSelection && (Array.isArray(presets.rowSelection.gridRowIndexes) || Array.isArray(presets.rowSelection.dataContextIds))) {
+    if (enableRowSelection && this.slickGrid?.getSelectionModel() && presets?.rowSelection && (Array.isArray(presets.rowSelection.gridRowIndexes) || Array.isArray(presets.rowSelection.dataContextIds))) {
       let dataContextIds = presets.rowSelection.dataContextIds;
       let gridRowIndexes = presets.rowSelection.gridRowIndexes;
 
@@ -1262,7 +1261,7 @@ export class AngularSlickgridComponent implements AfterViewInit, OnDestroy {
     // register all services by executing their init method and providing them with the Grid object
     if (Array.isArray(this._registeredResources)) {
       for (const resource of this._registeredResources) {
-        if (typeof resource.init === 'function') {
+        if (this.slickGrid && typeof resource.init === 'function') {
           resource.init(this.slickGrid, this.containerService);
         }
       }

src/app/modules/angular-slickgrid/services/container.service.ts

@@ -15,6 +15,10 @@ export class ContainerService implements UniversalContainerService {
     return null;
   }
 
+  dispose() {
+    this.dependencies = [];
+  }
+
   registerInstance(key: string, instance: any) {
     const dependency = this.dependencies.some(dep => dep.key === key);
     if (!dependency) {