[add] what's new and updates for v9.2.5

docs/data_collection/api/datacollection_add_method.md

@@ -8,6 +8,10 @@ description: You can explore the add method of DataCollection in the documentati
 
 @short: adds a new item to the component
 
+:::note
+Please note that data should be loaded into DataCollection via the `parse()` method. The `add()` method is primarily intended for loading standalone elements or small groups of elements, so its loads data slower than the `parse()` method.
+:::
+
 @signature: {'add(new_item: object | object[], index?: number): (string | number) | (string | number)[];'}
 
 @params:

docs/data_collection/api/datacollection_afteradd_event.md

@@ -6,16 +6,18 @@ description: You can explore the afterAdd event of DataCollection in the documen
 
 # afterAdd
 
-@short: fires after adding a new item into a data collection
+@short: fires after adding a new item/items into a data collection
 
-@signature: {'afterAdd: (newItem: object) => void;'}
+@signature: {'afterAdd: (newItem: IDataItem, batch: IDataItem[], index: number) => void;'}
 
 @params:
 - `newItem: object` - the object of an added item
+- `batch: array` - an array of added items
+- `index: number` - the index of the added item within the batch
 
 @example:
-component.data.events.on("afterAdd", function(newItem){
-    console.log("A new item is added");
+component.data.events.on("afterAdd", function(newItem, batch, index){
+    console.log("New items are added");
 });
 
 @descr:

docs/data_collection/api/datacollection_afterremove_event.md

@@ -6,16 +6,18 @@ description: You can explore the afterRemove event of DataCollection in the docu
 
 # afterRemove
 
-@short: Fires after removing an item from a data collection
+@short: Fires after removing an item/items from a data collection
 
-@signature: {'afterRemove: (removedItem: object) => void;'}
+@signature: {'afterRemove: (removedItem: IDataItem, batch: IDataItem[], index: number) => void;'}
 
 @params:
 - `removedItem: object` - the object of a removed item
+- `batch: array` - an array of removed items
+- `index: number` - the index of the removed item within the batch
 
 @example:
-component.data.events.on("afterRemove", function(removedItem){
-    console.log("An item is removed");
+component.data.events.on("afterRemove", function(removedItem, batch, index){
+    console.log("Items are removed");
 });
 
 @descr:

docs/data_collection/api/datacollection_beforeadd_event.md

@@ -6,19 +6,21 @@ description: You can explore the beforeAdd event of DataCollection in the docume
 
 # beforeAdd
 
-@short: fires before adding a new item into a data collection
+@short: fires before adding a new item/items into a data collection
 
-@signature: {'beforeAdd: (newItem: object) => boolean | void;'}
+@signature: {'beforeAdd: (newItem: IDataItem, batch: IDataItem[], index: number) => boolean | void;'}
 
 @params:
 - `newItem: object` - the object of an added item
+- `batch: array` - an array of added items
+- `index: number` - the index of the added item within the batch
 
 @returns:
 Return `false` to prevent an item adding into a data collection; otherwise, `true`.
 
 @example:
-component.data.events.on("beforeAdd", function(newItem){
-    console.log("A new item will be added");
+component.data.events.on("beforeAdd", function(newItem, batch, index){
+    console.log("New items will be added");
     return true;
 });
 

docs/data_collection/api/datacollection_beforeremove_event.md

@@ -6,19 +6,21 @@ description: You can explore the beforeRemove event of DataCollection in the doc
 
 # beforeRemove
 
-@short: fires before removing an item from a data collection
+@short: fires before removing an item/items from a data collection
 
-@signature: {'beforeRemove: (removedItem: object) => boolean | void;'}
+@signature: {'beforeRemove: (removedItem: IDataItem, batch: IDataItem[], index: number) => boolean | void;'}
 
 @params:
 - `removedItem: object` - the object of an item to remove
+- `batch: array` - an array of removed items
+- `index: number` - the index of the removed item within the batch
 
 @returns:
 Return `false` to block removing an item from a data collection; otherwise, `true`.
 
 @example:
-component.data.events.on("beforeRemove", function(removedItem){
-    console.log("An item will be removed");
+component.data.events.on("beforeRemove", function(removedItem, batch, index){
+    console.log("Items will be removed");
     return true;
 });
 

docs/whatsnew.md

@@ -8,6 +8,20 @@ description: You can explore what's new in DHTMLX Suite and its release history
 
 Before updating DHTMLX to the latest version, please check the [Migration to Newer Versions](migration.md) guide to avoid possible breakdowns.
 
+## Version 9.2.5
+
+Released on November 28, 2025
+
+### Updates
+
+- DataCollection. The [`beforeAdd`](/data_collection/api/datacollection_beforeadd_event/), [`afterAdd`](/data_collection/api/datacollection_afteradd_event/), [`beforeRemove`](/data_collection/api/datacollection_beforeremove_event/), and [`afterRemove`](/data_collection/api/datacollection_afterremove_event/) events are updated to include the `batch` and `index` parameters for handling batch operations
+
+### Fixes
+
+- Grid. Improved performance of adding and removing data via the `add()` and `remove()` methods when the `adjust` configuration is enabled
+- Grid. The issue where the combo filter with enabled `multiselection` displayed all options ignoring other active filters is fixed
+- TreeCollection. The issue where the `items` property of a parent object returned by the `getItem()` and `find()` methods included a removed child item is fixed
+
 ## Version 9.2.4
 
 Released on November 17, 2025