[add] docs updates for v5.2

docs/api/api_overview.md

@@ -34,13 +34,17 @@ Parameters:
 | [](api/spreadsheet_eachcell_method.md)       | @getshort(api/spreadsheet_eachcell_method.md)       |
 | [](api/spreadsheet_endedit_method.md)        | @getshort(api/spreadsheet_endedit_method.md)        |
 | [](api/spreadsheet_fitcolumn_method.md)      | @getshort(api/spreadsheet_fitcolumn_method.md)      |
+| [](api/spreadsheet_freezecols_method.md)     | @getshort(api/spreadsheet_freezecols_method.md)     |
+| [](api/spreadsheet_freezerows_method.md)     | @getshort(api/spreadsheet_freezerows_method.md)     |
 | [](api/spreadsheet_getactivesheet_method.md) | @getshort(api/spreadsheet_getactivesheet_method.md) |
 | [](api/spreadsheet_getfilter_method.md)      | @getshort(api/spreadsheet_getfilter_method.md)      |
 | [](api/spreadsheet_getformat_method.md)      | @getshort(api/spreadsheet_getformat_method.md)      |
 | [](api/spreadsheet_getformula_method.md)     | @getshort(api/spreadsheet_getformula_method.md)     |
 | [](api/spreadsheet_getsheets_method.md)      | @getshort(api/spreadsheet_getsheets_method.md)      |
 | [](api/spreadsheet_getstyle_method.md)       | @getshort(api/spreadsheet_getstyle_method.md)       |
 | [](api/spreadsheet_getvalue_method.md)       | @getshort(api/spreadsheet_getvalue_method.md)       |
+| [](api/spreadsheet_hidecols_method.md)       | @getshort(api/spreadsheet_hidecols_method.md)       |
+| [](api/spreadsheet_hiderows_method.md)       | @getshort(api/spreadsheet_hiderows_method.md)       |
 | [](api/spreadsheet_hidesearch_method.md)     | @getshort(api/spreadsheet_hidesearch_method.md)     |
 | [](api/spreadsheet_insertlink_method.md)     | @getshort(api/spreadsheet_insertlink_method.md)     |
 | [](api/spreadsheet_islocked_method.md)       | @getshort(api/spreadsheet_islocked_method.md)       |
@@ -58,8 +62,12 @@ Parameters:
 | [](api/spreadsheet_setstyle_method.md)       | @getshort(api/spreadsheet_setstyle_method.md)       |
 | [](api/spreadsheet_setvalidation_method.md)  | @getshort(api/spreadsheet_setvalidation_method.md)  |
 | [](api/spreadsheet_setvalue_method.md)       | @getshort(api/spreadsheet_setvalue_method.md)       |
+| [](api/spreadsheet_showcols_method.md)       | @getshort(api/spreadsheet_showcols_method.md)       |
+| [](api/spreadsheet_showrows_method.md)       | @getshort(api/spreadsheet_showrows_method.md)       |
 | [](api/spreadsheet_startedit_method.md)      | @getshort(api/spreadsheet_startedit_method.md)      |
 | [](api/spreadsheet_undo_method.md)           | @getshort(api/spreadsheet_undo_method.md)           |
+| [](api/spreadsheet_unfreezecols_method.md)   | @getshort(api/spreadsheet_unfreezecols_method.md)   |
+| [](api/spreadsheet_unfreezerows_method.md)   | @getshort(api/spreadsheet_unfreezerows_method.md)   |
 | [](api/spreadsheet_unlock_method.md)         | @getshort(api/spreadsheet_unlock_method.md)         |
 
 ## Spreadsheet events
@@ -70,6 +78,7 @@ Parameters:
 | [](api/spreadsheet_afterclear_event.md)         | @getshort(api/spreadsheet_afterclear_event.md)         |
 | [](api/spreadsheet_aftercolumnadd_event.md)     | @getshort(api/spreadsheet_aftercolumnadd_event.md)     |
 | [](api/spreadsheet_aftercolumndelete_event.md)  | @getshort(api/spreadsheet_aftercolumndelete_event.md)  |
+| [](api/spreadsheet_afterdataloaded_event.md)    | @getshort(api/spreadsheet_afterdataloaded_event.md)    |
 | [](api/spreadsheet_aftereditend_event.md)       | @getshort(api/spreadsheet_aftereditend_event.md)       |
 | [](api/spreadsheet_aftereditstart_event.md)     | @getshort(api/spreadsheet_aftereditstart_event.md)     |
 | [](api/spreadsheet_afterfocusset_event.md)      | @getshort(api/spreadsheet_afterfocusset_event.md)      |
@@ -113,15 +122,14 @@ Parameters:
 | [](api/spreadsheet_exportmodulepath_config.md) | @getshort(api/spreadsheet_exportmodulepath_config.md) |
 | [](api/spreadsheet_formats_config.md)          | @getshort(api/spreadsheet_formats_config.md)          |
 | [](api/spreadsheet_importmodulepath_config.md) | @getshort(api/spreadsheet_importmodulepath_config.md) |
-| [](api/spreadsheet_leftsplit_config.md)        | @getshort(api/spreadsheet_leftsplit_config.md)        |
 | [](api/spreadsheet_localization_config.md)     | @getshort(api/spreadsheet_localization_config.md)     |
 | [](api/spreadsheet_menu_config.md)             | @getshort(api/spreadsheet_menu_config.md)             |
 | [](api/spreadsheet_multisheets_config.md)      | @getshort(api/spreadsheet_multisheets_config.md)      |
 | [](api/spreadsheet_readonly_config.md)         | @getshort(api/spreadsheet_readonly_config.md)         |
 | [](api/spreadsheet_rowscount_config.md)        | @getshort(api/spreadsheet_rowscount_config.md)        |
 | [](api/spreadsheet_timeformat_config.md)       | @getshort(api/spreadsheet_timeformat_config.md)       |
 | [](api/spreadsheet_toolbarblocks_config.md)    | @getshort(api/spreadsheet_toolbarblocks_config.md)    |
-| [](api/spreadsheet_topsplit_config.md)         | @getshort(api/spreadsheet_topsplit_config.md)         |
+
 
 ## Selection methods
 

docs/api/overview/actions_overview.md

@@ -74,10 +74,13 @@ spreadsheet.events.on("beforeColumnAdd", function(cell){
 | **setValidation**    | The action is executed when setting data validation for a cell                                                                                                                                          |
 | **sortCells**        | The action is executed when sorting data in spreadsheet                                                                                                                                                 |
 | **setCellStyle**     | The action is executed when changing the style of a cell                                                                                                                                                |
+| **toggleVisibility** | The action is executed when hiding/showing columns/rows                                                                                                                                                 |
+| **toggleFreeze**     | The action is executed when freezing/unfreezing columns/rows                                                                                                                                            |
 | **unmerge**          | The action is executed when splitting cells                                                                                                                                                             |
 
 **Change log:**
 
+- The **toggleFreeze** and **toggleVisibility** actions were added in v5.2
 - The **merge**, **unmerge**, **filter**, **fitColumn**, **insertLink** actions were added in v5.0
 
 **Related sample:** [Spreadsheet. Actions](https://snippet.dhtmlx.com/efcuxlkt)

docs/api/overview/events_overview.md

@@ -12,6 +12,7 @@ description: You can have an Events overview of the DHTMLX JavaScript Spreadshee
 | [](../spreadsheet_afterclear_event.md)         | @getshort(../spreadsheet_afterclear_event.md)         |
 | [](../spreadsheet_aftercolumnadd_event.md)     | @getshort(../spreadsheet_aftercolumnadd_event.md)     |
 | [](../spreadsheet_aftercolumndelete_event.md)  | @getshort(../spreadsheet_aftercolumndelete_event.md)  |
+| [](../spreadsheet_afterdataloaded_event.md)  	 | @getshort(../spreadsheet_afterdataloaded_event.md)    |
 | [](../spreadsheet_aftereditend_event.md)       | @getshort(../spreadsheet_aftereditend_event.md)       |
 | [](../spreadsheet_aftereditstart_event.md)     | @getshort(../spreadsheet_aftereditstart_event.md)     |
 | [](../spreadsheet_afterfocusset_event.md)      | @getshort(../spreadsheet_afterfocusset_event.md)      |

docs/api/overview/methods_overview.md

@@ -18,12 +18,16 @@ description: You can have a Methods overview of the DHTMLX JavaScript Spreadshee
 | [](../spreadsheet_eachcell_method.md)       | @getshort(../spreadsheet_eachcell_method.md)       |
 | [](../spreadsheet_endedit_method.md)        | @getshort(../spreadsheet_endedit_method.md)        |
 | [](../spreadsheet_fitcolumn_method.md)      | @getshort(../spreadsheet_fitcolumn_method.md)      |
+| [](../spreadsheet_freezecols_method.md)     | @getshort(../spreadsheet_freezecols_method.md)     |
+| [](../spreadsheet_freezerows_method.md)     | @getshort(../spreadsheet_freezerows_method.md)     |
 | [](../spreadsheet_getactivesheet_method.md) | @getshort(../spreadsheet_getactivesheet_method.md) |
 | [](../spreadsheet_getfilter_method.md)      | @getshort(../spreadsheet_getfilter_method.md)      |
 | [](../spreadsheet_getformat_method.md)      | @getshort(../spreadsheet_getformat_method.md)      |
 | [](../spreadsheet_getformula_method.md)     | @getshort(../spreadsheet_getformula_method.md)     |
 | [](../spreadsheet_getsheets_method.md)      | @getshort(../spreadsheet_getsheets_method.md)      |
 | [](../spreadsheet_getstyle_method.md)       | @getshort(../spreadsheet_getstyle_method.md)       |
+| [](../spreadsheet_hidecols_method.md)       | @getshort(../spreadsheet_hidecols_method.md)       |
+| [](../spreadsheet_hiderows_method.md)       | @getshort(../spreadsheet_hiderows_method.md)       |
 | [](../spreadsheet_hidesearch_method.md)     | @getshort(../spreadsheet_hidesearch_method.md)     |
 | [](../spreadsheet_getvalue_method.md)       | @getshort(../spreadsheet_getvalue_method.md)       |
 | [](../spreadsheet_insertlink_method.md)     | @getshort(../spreadsheet_insertlink_method.md)     |
@@ -42,6 +46,10 @@ description: You can have a Methods overview of the DHTMLX JavaScript Spreadshee
 | [](../spreadsheet_setstyle_method.md)       | @getshort(../spreadsheet_setstyle_method.md)       |
 | [](../spreadsheet_setvalidation_method.md)  | @getshort(../spreadsheet_setvalidation_method.md)  |
 | [](../spreadsheet_setvalue_method.md)       | @getshort(../spreadsheet_setvalue_method.md)       |
+| [](../spreadsheet_showcols_method.md)       | @getshort(../spreadsheet_showcols_method.md)       |
+| [](../spreadsheet_showrows_method.md)       | @getshort(../spreadsheet_showrows_method.md)       |
 | [](../spreadsheet_startedit_method.md)      | @getshort(../spreadsheet_startedit_method.md)      |
 | [](../spreadsheet_undo_method.md)           | @getshort(../spreadsheet_undo_method.md)           |
+| [](../spreadsheet_unfreezecols_method.md)   | @getshort(../spreadsheet_unfreezecols_method.md)   |
+| [](../spreadsheet_unfreezerows_method.md)   | @getshort(../spreadsheet_unfreezerows_method.md)   |
 | [](../spreadsheet_unlock_method.md)         | @getshort(../spreadsheet_unlock_method.md)         |

docs/api/overview/properties_overview.md

@@ -14,12 +14,11 @@ description: You can have a Properties overview of the DHTMLX JavaScript Spreads
 | [](../spreadsheet_exportmodulepath_config.md) | @getshort(../spreadsheet_exportmodulepath_config.md) |
 | [](../spreadsheet_formats_config.md)          | @getshort(../spreadsheet_formats_config.md)          |
 | [](../spreadsheet_importmodulepath_config.md) | @getshort(../spreadsheet_importmodulepath_config.md) |
-| [](../spreadsheet_leftsplit_config.md)        | @getshort(../spreadsheet_leftsplit_config.md)        |
 | [](../spreadsheet_localization_config.md)     | @getshort(../spreadsheet_localization_config.md)     |
 | [](../spreadsheet_menu_config.md)             | @getshort(../spreadsheet_menu_config.md)             |
 | [](../spreadsheet_multisheets_config.md)      | @getshort(../spreadsheet_multisheets_config.md)      |
 | [](../spreadsheet_readonly_config.md)         | @getshort(../spreadsheet_readonly_config.md)         |
 | [](../spreadsheet_rowscount_config.md)        | @getshort(../spreadsheet_rowscount_config.md)        |
 | [](../spreadsheet_timeformat_config.md)       | @getshort(../spreadsheet_timeformat_config.md)       |
 | [](../spreadsheet_toolbarblocks_config.md)    | @getshort(../spreadsheet_toolbarblocks_config.md)    |
-| [](../spreadsheet_topsplit_config.md)         | @getshort(../spreadsheet_topsplit_config.md)         |
+

docs/api/spreadsheet_afterdataloaded_event.md

@@ -0,0 +1,40 @@
+---
+sidebar_label: afterDataLoaded
+title: afterDataLoaded event
+description: You can learn about the afterDataLoaded event in the documentation of the DHTMLX JavaScript Spreadsheet library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX Spreadsheet.
+---
+
+# afterDataLoaded
+
+### Description
+
+@short: Fires after data loading is complete
+
+### Usage
+
+~~~jsx
+afterDataLoaded: () => void;
+~~~
+
+### Example
+
+~~~jsx 
+const spreadsheet = new dhx.Spreadsheet("spreadsheet_container", {});
+spreadsheet.parse(data);
+
+// subscribe to the "afterDataLoaded" event
+spreadsheet.events.on("afterDataLoaded", () => {
+    dhx.message({
+        text: "Data is successfully loaded into Spreadsheet!",
+        css: "dhx_message--success",
+        expire: 5000
+    });
+});
+~~~
+
+**Change log:** Added in v5.2
+
+**Related articles:** [Event handling](handling_events.md)
+
+**Related sample:** [Spreadsheet. Data loaded event](https://snippet.dhtmlx.com/vxr7amz6)
+

docs/api/spreadsheet_freezecols_method.md

@@ -0,0 +1,37 @@
+---
+sidebar_label: freezeCols() 
+title: freezeCols method
+description: You can learn about the freezeCols method in the documentation of the DHTMLX JavaScript Spreadsheet library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX Spreadsheet.
+---
+
+# freezeCols()
+
+### Description
+
+@short: Fixes ("freezes") columns
+
+### Usage
+
+~~~jsx
+freezeCols(cell?: string): void;
+~~~
+
+### Parameters
+
+- `cell` - (optional) the id of the cell used to define the id of a column. If the cell id isn't passed, the currently selected cell will be used 
+
+### Example
+
+~~~jsx 
+spreadsheet.freezeCols("B2"); // the columns up to the "B" column will be fixed
+spreadsheet.freezeCols("sheet2!B2"); // the columns up to the "B" column in "sheet2" will be fixed
+~~~
+
+**Related articles:** [Work with Spreadsheet](working_with_ssheet.md/#freezingunfreezing-rows-and-columns)
+
+**Related API:** [`unfreezeCols()`](api/spreadsheet_unfreezecols_method.md/)
+
+**Related sample:** [Spreadsheet. Freezing columns and rows via API](https://snippet.dhtmlx.com/a12xd1mn)
+
+**Change log:** 
+Added in v5.2

docs/api/spreadsheet_freezerows_method.md

@@ -0,0 +1,37 @@
+---
+sidebar_label: freezeRows() 
+title: freezeRows method
+description: You can learn about the freezeRows method in the documentation of the DHTMLX JavaScript Spreadsheet library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX Spreadsheet.
+---
+
+# freezeRows()
+
+### Description
+
+@short: Fixes ("freezes") rows
+
+### Usage
+
+~~~jsx
+freezeRows(cell?: string): void;
+~~~
+
+### Parameters
+
+- `cell` - (optional) the id of the cell used to define the id of a row. If the cell id isn't passed, the currently selected cell will be used 
+
+### Example
+
+~~~jsx 
+spreadsheet.freezeRows("B2"); // the rows up to the "2" row will be fixed
+spreadsheet.freezeRows("sheet2!B2"); // the rows up to the "2" row in "sheet2" will be fixed
+~~~
+
+**Related articles:** [Work with Spreadsheet](working_with_ssheet.md/#freezingunfreezing-rows-and-columns)
+
+**Related API:** [`unfreezeRows()`](api/spreadsheet_unfreezerows_method.md/)
+
+**Related sample:** [Spreadsheet. Freezing columns and rows via API](https://snippet.dhtmlx.com/a12xd1mn)
+
+**Change log:** 
+Added in v5.2

docs/api/spreadsheet_hidecols_method.md

@@ -0,0 +1,38 @@
+---
+sidebar_label: hideCols()
+title: hideCols method
+description: You can learn about the hideCols method in the documentation of the DHTMLX JavaScript Spreadsheet library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX Spreadsheet.
+---
+
+# hideCols()
+
+### Description
+
+@short: Hides columns
+
+### Usage
+
+~~~jsx
+hideCols(cell?: string): void;
+~~~
+
+### Parameters
+
+- `cell` - (optional) the id of the cell used to define the id of a column. If the cell id isn't passed, the currently selected cell will be used 
+
+### Example
+
+~~~jsx 
+spreadsheet.hideCols("B2"); // the "B" column will be hidden
+spreadsheet.hideCols("sheet2!B2"); // the "B" column in "sheet2" will be hidden
+spreadsheet.hideCols("B2:C2"); // the "B" and "C" columns will be hidden
+~~~
+
+
+**Related articles:** [Work with Spreadsheet](working_with_ssheet.md/#hidingshowing-rows-and-columns)
+
+**Related API:** [`showCols()`](api/spreadsheet_showcols_method.md)
+
+**Related sample:** [Spreadsheet. Hiding columns and rows via API](https://snippet.dhtmlx.com/zere1ote)
+
+**Change log:** Added in v5.2

docs/api/spreadsheet_hiderows_method.md

@@ -0,0 +1,37 @@
+---
+sidebar_label: hideRows()
+title: hideRows method
+description: You can learn about the hideRows method in the documentation of the DHTMLX JavaScript Spreadsheet library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX Spreadsheet.
+---
+
+# hideRows()
+
+### Description
+
+@short: Hides rows
+
+### Usage
+
+~~~jsx
+hideRows(cell?: string): void;
+~~~
+
+### Parameters
+
+- `cell` - (optional) the id of the cell used to define the id of a row. If the cell id isn't passed, the currently selected cell will be used 
+
+### Example
+
+~~~jsx 
+spreadsheet.hideRows("B2"); // the "2" row will be hidden 
+spreadsheet.hideRows("sheet2!B2"); // the "2" row in "sheet2" will be hidden 
+spreadsheet.hideRows("B2:C4"); // the rows from "2" to "4" will be hidden 
+~~~
+
+**Related articles:** [Work with Spreadsheet](working_with_ssheet.md/#hidingshowing-rows-and-columns)
+
+**Related API:** [`showRows()`](api/spreadsheet_showrows_method.md)
+
+**Related sample:** [Spreadsheet. Hiding columns and rows via API](https://snippet.dhtmlx.com/zere1ote)
+
+**Change log:** Added in v5.2