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TreeGrid versions compatibility

Changes log (txt file) Upgrading from 9.3 to 10.0 Upgrading from 5.9 to 6.0

Creating grid

Simple examples Basic information Creating grid Deleting grid Reloading grid Rendering grid Accessing grid by API

Data & communication
Data communication with server

Communication types AJAX communication AJAX SOAP envelope Submit communication Directly included data Data from JavaScript Cross domain / local load by JSONP Sessions (AJAX) Server response (AJAX) Synchronous communication (AJAX) Caching (AJAX) API (AJAX)

Download data

Settings for data download Layout XML structure Data XML structure

Upload data

Settings for data upload API for upload XML structure sent to server

Changing data from server

XML structure of download changes XML structure of request for a cell Synchronizing data with server

Input / output data formats

Complete list of tags Internal XML format Short XML format Extra short XML format DTD XML format JSON format

Cells
Cell basics

Cell type Cell format Dynamic format Dynamic type Cell value Reading / writing attributes by API Cell HTML Range or more values in one cell Cell with link URL Cell hint Cell tooltip / title Cell popup menu

Cell editing and changing values

Cell editability Defaults list Suggest list (auto complete) Changing cell value Mass cell change Clearing cells Editing cells Controlling <input> tag by JavaScript Input validation and restrictions Side checkbox Cell selecting

Calculations - cell formulas

Basics Formulas Mathematical functions Aggregate functions Special functions for actions Custom functions

Calculations - editable cell formulas

Basics Suggest list (auto complete) Actions for choosing cells Conditional functions Lookup functions Cell reference functions Logical functions Informational functions Mathematical functions Trigonometry functions Rounding numbers Number conversions String functions Date functions Summary functions Custom functions

Cell side buttons

Introduction Right side Button Left side Icon

Cell spanning

Column span Row span Dynamic spanning

Cell style and color

Basic grid style Sizing and scaling - responsive design Dynamic cell style attributes Cell CSS class Cell background color Dynamic cell border Cell HTML style Row color alteration Cell mouse cursor

Cell types
Auto type - Auto String - Text, Lines & Pass
Number - Int & Float

Format Localization

Date and time - Date

Format Calendar component Dates dialog Localization

List & combo - Enum & Radio

Introduction Definition Related lists Enum specific Radio specific

Checkbox - Bool
Action button - Button

Introduction Basic clickable button Switch button Radio / tab button Menu button Combo switch button Combo radio / tab button Special Space rows with buttons

Panel with more buttons - Panel

Definition Standard fast panel Custom panel

HTML and special types

Html type Icon type Abs type List type Editable Link type Editable Img type DropCols type Upload File type

Columns

Column basics Column index Column visibility Column visibility menu Column selecting Column tree Column position and moving Column adding and copying Column deleting Column width Column API

Rows
Row basics

Rows by functionality Rows by position Row name Row id Row index

Default rows

Description Example of default rows Example of changing default row Attributes

Row tree

Tree attributes Actions & API for expand / collapse

Row identification

Setting row id attribute Row id attribute in tree Row id created from cell values API for row ids

Row visibility
Row adding and copying

Five ways of adding rows to grid Adding and copying restrictions Adding new empty rows Copying existing rows

Row deleting Row moving and dragging Row selecting Row height Row API Space rows
Features
Sorting rows

Sort settings Controlling sort position Comparing strings Sorting actions Sorting API

Grouping rows to tree

Group settings Creating groups Comparing strings Created group rows <D Group='1'/> User interface to choose grouping Grouping actions and API

Filtering rows

Filter settings Comparing strings User interface to choose filter Filter actions and API

Searching in rows and cells

Search settings User interface for search Search actions and API

Printing grid

Print settings Choosing items to print Page size Print API

Print / export to PDF

Introduction Client side settings Printing options Client side API Server side API Data sent from client to server

Export to Excel or CSV

Introduction Basic settings Communication with server Export API Client export Server export

Import from Excel

Basic settings Sheets manipulation

Copy & paste rows via clipboard

Copy & paste permissions Copying to clipboard Pasting from clipboard

Master - detail grids

Introduction External master - detail grids Nested master - detail grids Synchronizing grids Other attributes for master - detail

Pivot tables

Pivot attributes & API Pivot formulas

External objects (like Adobe Flash) Undo & Redo
Gantt and bar chart
Gantt objects

Gantt objects list Display settings Edit settings

Main bar

Definition of main bar and plans Main bar as Task Edit settings Main bar content and side html Tip on mouse hover Vertical position and height Style specific attributes API to manipulate Main bars Actions Side text (deprecated) Real Flow (deprecated)

Run bar

GanttRun Definition Extended definition Run bar as Task Edit settings Save format Selecting Run boxes Run box content and side html Tip on mouse hover Box identification Vertical position and height Style specific attributes Overlaid (Error) boxes Containers for more boxes Dragging - moving and resizing API to manipulate Run boxes Actions Run special formulas

Summary task

Main for Main Main for Run Editable Main Editable Run

Gantt icons - Flag & Point

Flag - icon with text Point - math points

Gantt display objects

Header - column captions Cell and column Background Vertical movable Line Mark & Progress line

Gantt zoom

Zoom options Chart size limits Zoom selection Paging in Gantt chart

Dependency, constraints & schedule

Introduction Data units Defining dependencies Dependency colors and shapes Changing dependencies Correcting dependencies Scheduling algorithm Project date constraints Task date constraints Critical path - Slack (Float)

Gantt calendars

Global base calendar Local calendar Calendar list Calendars dialog Other settings

Gantt resources

Resources list Resources assign Resources filter Resources calculations Availability chart Resource usage chart Generated resource usage chart

Gantt popup menu Gantt API
Line and XY points charts

Charts in grid cells Chart JSON definition Base chart settings Basic attributes Size Axis and caption Individual chart lines Data sources Visual settings API for standalone usage

Paging in large grids
Paging root rows

Paging types and attributes Auto adding root pages API for paging

Pager components

Side pager Side pager type Pages Side pager type Gantt Side pager type Custom Pager with navigation buttons & edit Pager as list of page indexes

Paging in tree

ChildPaging - load / render on expand MaxChildren - limit children count ChildParts - load / render on scroll

Paging columns

Paging types and attributes Auto adding column pages API for column paging

Server paging

Server paging for root rows Server communication in root paging Root paging in very large tables Server paging in tree Server communication in tree paging XML Request for Data in root paging XML Download Data in root paging XML Request for root Page / children XML Download root Page / children API for server paging

TreeGrid DLL/SO for server paging

Introduction Compatibility with TreeGrid control Using TreeGrid server DLL/SO ASP.NET C# ASP.NET VB PHP JSP Java TreeGrid server concepts Function reference Calculations

JSON menus and dialogs
JSON menu description JSON menu definition example
Menu settings

Base attributes Visual settings Key navigation Behavior Size and scroll

Menu item settings

Base attributes Clickable item Inactive caption Collapsible sub level Popup sub menu Columns Bool item Enum item Edit item

Custom menu in JavaScript

Show custom menu Custom menu position Custom menu advanced settings Custom menu JavaScript events Custom menu JavaScript methods

Calendar dialog Custom calendar & JavaScript events Custom dialog in JavaScript
Global grid settings
Grid size and scroll

Default behavior Maximize grid height and width Update size according to the content Let a user to control the grid size Widths of individual sections Other scrolling attributes and API

Media rules - responsive design
Grid cursor - Focus & hover

Focused cell and row Focused cell range Move and copy focused cells Filling cell values by dragging Tabulator navigation Key navigation Cursor look - focus & hover

Selecting rows, cells and columns

Selecting base Selecting rows Selecting cells Selecting columns

Global settings

Status messages Configuration menus Configuration menu - options Configuration menu - columns Configuration menu - print / PDF Configuration menu - export Default toolbar Language & regional setup (Text.xml) Useful API function Help file

Animations

Animations base Row animations Column animations Cell animations Animations for undo / redo Animations for server side changes Dialog animations

Grid configuration in cookies
Mouse & key events & actions

List of event handler types TreeGrid mouse events Mouse event names Key and mouse button prefixes Touch event names Event targets Assigning event actions / callbacks Event action parameters Calling actions from JavaScript Creating custom actions Focused vs. Actual cell TreeGrid key events JavaScript API events

Mouse API event TreeGrid files
Debugging and testing

Debug window Automated testing

Server paging

TreeGrid documentation

Server paging for root rows (Paging='3')

For basic information about paging and client paging see Paging documentation.

Server paging is expected to use for large grids with more than 10,000 root rows.
In server paging are pages downloaded on demand when they are visible by scroll.
The server script is responsible for sending data for requested page and also for sorting, filtering, grouping, searching and aggregate calculation. This means that all the required features must be done on server side by server script.

There is available TreeGrid server DLL/SO that can be used to as support library for TreeGrid server paging - if you provide to the library the whole XML data, it will generate pages to client and will also provide all requested features like sorting, filtering, grouping and aggregate calculations.
See TreeGrid.dll/so documentation.

If you are not able to do sorting, filtering or grouping on server and you still want to use server paging, you can set OnePage attribute (and AllPages=0) to do them partially in actual page.

You can mix server and client Paging, for pages that should use client paging fill their data in body response.

Paging can be set to 3 independently of ChildPaging value.
Server paging cannot be used with Gantt chart.
<Cfg> int

Paging

[0] <Cfg Paging='3'/>
To use server paging of root rows set Paging to 3.
<Cfg> int

PageLength

[20]
Average count of rows in page.
For client paging there are all pages created to contain this number of rows (except the last one).
For server paging it determines height of page - it is default value of <B Count> attribute.
Exact count of rows in pages can differ due to adding or deleting rows or in last incomplete page.
Every page must contain at least one row otherwise it is deleted. Exception is when grid does not contain any row, so it contains one empty page.
In TreeGrid server DLL/SO is this parameter used to set count of rows in page.
<Cfg> int

RootCount

Count of all rows in root. Used to compute Count parameter of the last page when server paging used and pages have not Count attribute set.
<Cfg> int

OnePage

[0]
If set to 1, sorts, filters or groups rows only in actual page. Only when AllPages = 0 (one page visible at a time).
Bit array: 1. bit (&1) sorting, 2. bit (&2) filtering, 3. bit (&4) grouping. Set to 7 for all actions done at one page only.
Use this attribute only for server paging (Paging=3) if you are not able to do sorting, filtering or grouping on server.
<Cfg> int

ReloadChanged

[5]
If permits reloading grid if not uploaded changes are pending.
0 - no (does not allow neither reloading nor server side sorting/filtering/searching/grouping)
1 - yes, save them (only when reloading as request for server side filtering/sorting/searching/grouping, for reload by Reload button always discards changes),
2 - yes, discard changes (should be used only when changes are not saved to server at all and server paging is used)
3 - show confirmation message to user
&4 - test also selected rows (values 4,5,6,7 are related to 0,1,2,3)
<B> string

id

(Both letters lowercase !)
Unique ID of the page. By this ID is page identified when downloading data for this page. Used only if Rows are not set.
If set neither id nor Rows attribute, the page is identified by attribute Pos as its position inside body. But this position can change if any page is deleted.
<B> string

Rows

User string to identify the page. If set, the page is identified by this string when downloading data for this page. It can for example contain a list of row ids the page contains.
It can also be used to specify different url for every page by using Page_Url with wildcard *Rows.
<B> int

Pos

Page position inside body (from 0), identifies the page, if id and Rows not set.
<B> string

Name

Name of the page, displayed in right side pager. It can contain HTML code (coded).
<B> string

Title

Title of page, displayed in pager as tool tip. It can contain HTML if set <Cfg StandardTip='0'/>
<B> string

NameXY

There can be predefined names according to sorting. If these are set, the Name and Title are created from them.
These names specifies the first and last value on page in sorting columns.
X is boundary = 0 - both (both values are the same in this column), 1 - top, 2 - bottom. Can be used either 0 or 1+2.
Y is sorting column 0,1,2.
There are possible combinations of XY (separated by #):
10 => 20 # 10,11 => 20,21 # 10,11,12 => 20,21,22 # 00 # 00 | 11 => 21 # 00 | 11,12 => 21,22 # 00, 01 # 00, 01 | 12 => 22
For example: Name00='blue' Name11='100' Name21='154' means that page shows all blue values from 100 to 154.
<B> int

Count

[0]
Count of rows the page contains. It specifies height of the page when it does not show rows yet. It is also result of count function in formulas.
If not set, it is used <Cfg PageLength value. Or for the last page is Count computed from <Cfg RootCount> and row count in other pages.
<B cell> string

sum, count, ...

If any fixed or space row in grid in server paging contains some aggregate function like sum or count, the server must pre-calculate and fill all the results of these functions, because TreeGrid cannot do it on client without the page data.
For more information see aggregate functions.
For example if some fixed row contains AFormula='sum()' the all the pages should contain for example Asum='123.50'

Server communication in root paging

For server Paging you must define <treegrid/bdo Page_Url/> to download the page(s) data from.

If Paging is set to 3 (Server) TreeGrid loads actual configuration from cookies, inserts it to the request for Data (to Data_Url), sends it to server and downloads prepared pages without data. This request contains sorting, grouping, filter and search settings.
Server prepares pages - calculates, sorts, filters and groups rows and distributes rows to pages. It also sets page names and results of aggregate functions for page and column.
Server Data response contains only <Body> tag with only <B> tags with attributes, but without any child <I> tags. Some pages (<B>) can contain their rows to use client paging only for them.

When any not loaded page is displayed, TreeGrid downloads data for this page by sending the request for Page (to Page_Url). The request for page (<B> tag) contains Rows attribute of page (if was set) or id attribute (if was set) and (always) Pos attribute as page index (position from 0).
The request also contains sorting, grouping, filter and search settings, the same as when pages body was downloaded.
Server Page response contains the one requested page in <B> tag with the same identification attributes (Pos, id, Rows).

When user changes sorting, grouping, filter or search, TreeGrid reloads all data from data source Data_Url with new configuration in request for Data. And repeats loading of pages.
Re-calculations after cell change are still done on client. Calculated cells are not sent to server. Therefore server must also recalculate appropriate cells if changed values are saved to server.
If you are not able to do sorting, filtering or grouping on server and you still want to use these features, you can set OnePage attribute (and AllPages=0) to do them partially in actual page.

The data of returned page can contain also defaults (<D> tags). These defaults are added to grid layout, but should be used only for data in the page they were loaded with.

Example of request for body (grid has columns named A,B,C,D,E)
<Grid>
<Cfg Sort='C,-A' Group='P' SearchExpression='new' SearchAction='Select'/>
<Filters><I id='MyFilter' C='10' CFilter='1' E='A' AFilter='10'/></Filters>
</Grid>


Example of resulted body (grid has also one foot row: <I AFormula='sum()' CFormula='sum("D")/2+A'/>)
<Grid>
<Body>
<B Count='20' Asum='123' Dsum='312' />
<B Count='20' Asum='453' Dsum='6.5' />
<B Count='20' Asum='1297' Dsum='-142.76' />
<B Count='12' Asum='145' Dsum='349.7' />
</Body>
</Grid>


Example of request for second page (grid has columns named A,B,C,D,E)
<Grid>
<Cfg Sort='C,-A' Group='P' SearchExpression='new' SearchAction='Select'/>
<Filters><I id='MyFilter' C='10' CFilter='1' E='A' AFilter='10'/></Filters>
<Body><B Pos='1'/></Body>
</Grid>


Example of resulted second page
<Grid>
<Body>
<B Pos='1'>
<I id='xa' A='10' B='20' C='10.3' D='-4.5' E='one'/>
... 18 rows ...
<I id='xu' A='3' B='12' C='4.6' D='-3.5' E='twenty'/>
</B>
</Body>
</Grid>


Root paging in very large tables
There are few advices how to use TreeGrid for grids with more then about 10 000 root rows. It is not related to huge trees, the tree can handle unlimited count of rows.
All these advices are used only to speed up rendering and using TreeGrid, they do not concern about handling of such amount of rows, TreeGrid can handle unlimited rows count.

For grids with more than 20 000 rows always use server paging (<Cfg Paging='3'/>). Your server script must provide data for grid's pages. You can use TreeGrid server component to help you with this task. The TreeGrid server can do nearly all functions required in server paging as creating pages according to sorting and filter settings. Also pre-calculates aggregate functions. Saves changes returned from client. And more.

For grids with more than 50 000 rows use Extra short format to send list of pages. The TreeGrid server does it automatically.
If possible, use all page of the same width and don't return rows count for every page, but set <Cfg PageLength and RootCount /> attributes. The TreeGrid server does it automatically.
Also increase <Cfg PageLength/> attribute according to count of columns in your grid. For 1 - 5 columns use 100, for 5-10 use 50 and for more columns use 30.
Also use <Cfg FastPages/> attribute. Set it to value about 100. Higher value speeds up initial rendering but can slow down work with the grid and vice versa.

For grids with more than 50 000 rows and all pages visible (<Cfg AllPages='1' />) use <Cfg PageLengthDiv/> attribute to reduce page size and all grid scroll height because some browsers have problems with too high scroll height.
IE8 can display only tags high up to 1342177.28 pixels (0x8000000/100) => 70640 rows with 19px height. Other browses have limit around 5M pixels => 263157 rows with 19px height.
Set PageLengthDiv to your rows count / 50 000. For 1 000 000 set it to 20. To be compatible with IE8.

For grids with more than 2 000 000 rows display only one page at once by using <Cfg AllPages='0' />. If you use configuration menu, set <MenuCfg ShowAllPages='0'/>. Also to suppress loading defaults for AllPages use <Cfg AllPagesLap='1'/>.
If you use TreeGrid server, remember that for such amount of rows it allocates about 400 MB memory. Of course, it does not concern client browser memory consumption; it is independent on row count.
<Cfg> int

FastPages

[0]
Speeds large tables with more than 50 000 root rows.
Set it to default value of 100 to speed up rendering of large tables.
Bigger value speeds up initial rendering, but can slow down TreeGrid usage and vice versa.
<Cfg> int

PageLengthDiv

[1]
Page length divider for large tables with more than 50 000 root rows with AllPages==1 and FastPages0.
This divides PageLength to display smaller non rendered pages.
Set this attribute to your rows count / 50 000. For 1 000 000 set it to 20. In this case set PageLength to be enough, for example to 100.
This attribute is used due problems in some browsers with too high tags (IE8 can display only tags high up to 1342177.28 pixels (0x8000000/100) => 70640 rows with 19px height).

Server paging in tree (ChildPaging='3)

For basic information about paging in tree and client ChildPaging see Paging in tree documentation.

Server paging in tree (ChildPaging) downloads children from server on collapsed parent expand or (since 7.0) on scroll to already expanded parent.
It downloads children only if the row has not any children yet and it has Count attribute.
By default it downloads children only on the first expand, you can change it by RemoveCollapsed attribute.

The server script is responsible for sending data for requested page and also for aggregate calculation of children. This means that if grid uses aggregate functions like sum() or count() the children must be pre-calculated on server side by server script.
Opposite to server root paging, server does not need to care about the sorting and filtering, but still needs to provide grouping and searching (except Filter action).
There is available TreeGrid server DLL/SO that can be used to as support library for TreeGrid server paging - if you provide to the library the whole XML data, it will generate children to client and will also provide all requested aggregate calculations.
See TreeGrid.dll/so documentation.

You can mix server and client ChildPaging, for rows that download children on demand set Count attribute, for other rows just fill their children in data.

ChildPaging can be set to 3 independently of Paging value.
Server ChildPaging cannot be used with Gantt chart.
<Cfg> int

ChildPaging

[0] <Cfg ChildPaging='3'/>
To use server paging in tree set ChildPaging to 3.
<Cfg> int

RemoveCollapsed

[0]
If children are removed when parent row collapses.
Set it to 3, if you want to download children on every parent expand. But remember, all pending changes in rows will be discarded.
API event void

OnRemoveCollapsed

(TGrid grid, TRow row)
Called after the row is collapsed and its children are deleted from data, only if set <Cfg RemoveCollapsed='3'/>
new 9.3 <Cfg> int

RemoveChanged

[0]
How will behave changed rows on RemoveCollapsed or RemoveUnused.
0 - Don't remove changed rows and selected rows. If there is any such row, the removing is not done.
1 - Don't remove changed rows. If there is any such row, the removing is not done.
2 - Remove changed rows
3 - Save changes and remove rows immediately
4 - Save changes and wait for the server success response before removing rows.
new 9.3 API event int

OnRemoveChanged

(TGrid grid, TRow page)
Called if removing page containing some changed (or selected row for RemoveChanged==0)
For RemoveChanged==2 is called always.
Return new value for RemoveChanged to use - 1, 2, 3, 4
<I> int

Count

[0]
Count of not downloaded children rows the row contains. Used when ChildPaging is set to 3.
Must be set to > 0 if you want to download children from server.
It also specifies height of the children after expand when downloading data.
<I> string

id

(Both letters lowercase !)
Unique ID of the parent row. By this ID is the row identified when downloading its children. Used only if Rows are not set.
<I> string

Rows

User string to identify the parent row. If set, the row is identified by this string when downloading its children. It can contain for example a list of children rows ids.
It can also be used to specify different url for every page by using Page_Url with wildcard *Rows.
<cell> string

sum, count, ...

If the parent row in server paging contains some aggregate function like sum or count, the server must pre-calculate and fill all the results of these functions, because TreeGrid cannot do it on client without the children.
For more information see aggregate functions.
For example if the row contains AFormula='sum()' the row should contain for example Asum='123.50'

Communication with server in ChildPaging

For server ChildPaging you must define <treegrid/bdo Page_Url/> to download the children data from.

If ChildPaging is set to 3 (Server), the communication for body is the same as for client or no paging, see data download documentation.

When user expands collapsed not yet loaded row with Count attribute, TreeGrid sends the request for Page to Page_Url. The requested row is set as <B> tag with row's attribute id. (For example: <Grid>...<Body><B id='r123'/></Body></Grid>).
The request also contains sorting, grouping, filter and search settings, the same as for root paging.
Server Page response contains the one requested page in <B> tag with the same identification attributes (id, Rows) and with content of the row's children. Server must return all immediate children and children of all expanded rows. Some of the downloaded children can be also collapsed with Count attribute to download their children on demand.

The parent row must have set the Count attribute to at least 1. It is better if Count is set to real count of immediate children the row contains + count of sub children of expanded children.

Example of request for children of row 'xy' (grid has columns named A,B,C,D,E):
<Grid>
<Cfg SortCols='C,A' SortTypes='0,1'/>
<Filters><I id='MyFilter' C='10' CFilter='1' E='A' AFilter='10'/></Filters>
<Body><B id='xy'/></Body>
</Grid>

XML Request for Data in server root paging

Used as request sent to data source Data when layout is already downloaded and grid configuration is known.
It contains session identification and grid configuration to sort, group, filter and search data on server. It contains also cursor position.
It is not sent if Data_Method="Get" - Get is default if no or client paging is used.

<Grid>
<IO ... attributes with request settings ... /> (Session attribute)
<Cfg ... attributes with grid settings read from cookies ... /> 
(Sort, Group, ReSort, ReCalc, TimeZone attributes)
(SearchAction, SearchExpression, SearchType, SearchMethod, SearchDefs, SearchCols attributes)
(Focused, FocusedCol, FocusedPos attributes)
(ScrollLeft, ScrollTop attributes) (new 6.3)
<Filters> (list of filters)
<I ... row and cell attributes ... /> (id attribute, cell values and cell Filter attributes)
... More tags <I> if more filters are in grid ...
</Filters>
</Grid>

XML Download Data in server root paging

Data XML for server paging defines pages and optionally their rows.
It is sent from server to grid. It is generated by server script. It is usually generated from server database or by TreeGrid server DLL / SO.
Used when downloading grid for first time or reloading all data for the grid (function Reload) or reloading only body (function ReloadBody) or downloading new data for changed sorting, filtering, grouping or searching - in server paging these functions must be done on server side.

If the <B> tag contains some rows, the page will be filled by these rows and will not request to download its content.
If the <B> tag is empty it must contain Count attribute to set to count of expected rows. The page will be shown empty and will request to download its content by Page request when it will be visible by scroll.

It can also contain some parts from Layout XML, like fixed rows or configuration settings if they need to generate dynamically to let the rest of the layout to be in static file.
It can also contain configuration settings like sort, filter or group if you want to change them when reloading body.

<Grid>
<Par> (list of prepared parameters for short formats)
<P Name="list name" List="parameter names, comma separated"/>
</Par>
<Body> (List of all pages)
<B ... page attributes ... > (page with or without rows, if the page does not contain rows, the rows will be requested in Page request on scroll)
<I ... row and cell attributes ... > (data row)
... More tags <I> ...
</B>
<B ... page attributes ... > (next page with or without rows, its position is 1)
... More tags <B> ...
</Body>
</Grid>

XML Request for Page or children

Used as request sent to data source Page to get the content of the page or child page.
It contains the page identification by Pos, id or Rows attribute(s).
It also contains grid configuration to check if it is the same as it was in body request.

<Grid>
<IO ... attributes with request settings ... /> (Session attribute)
<Cfg ... attributes with grid settings read from cookies ... /> 
(Sort, Group, ReSort, ReCalc, TimeZone attributes)
(SearchAction, SearchExpression, SearchType, SearchMethod, SearchDefs, SearchCols attributes)
(Focused, FocusedCol, FocusedPos attributes)
(ScrollLeft, ScrollTop attributes) (new 6.3)
<Filters> (list of filters)
<I ... row and cell attributes ... /> (id attribute, cell values and cell Filter attributes)
... More tags <I> if more filters are in grid ...
</Filters>

<Body>
</B ... attributes identifying the requested page or child page ... /> (Pos, id or Rows for page or id or Rows for child page (row))
</Body>
</Grid>

XML Download Page or children

Page XML contains one page definition with content for the requested page. If the XML contains more pages, all the others are ignored.

The <B> tag must have set Pos, id or Rows attribute to identify it on client as the requested page.

For server child paging some or all rows with children can have set Count attribute as the count of the expected children instead of the children themselves. The children will be downloaded on demand.

<Grid> (Root tag)
<Body> (List of all variable rows in pages, must not contain rows in root (only in pages))
<B ... identification attributes ... > (The one requested page or child page with rows)
<I ... row and cell attributes ... > (data row)
<I ... row and cell attributes ... > (data row)
<I ... row and cell attributes ... > (data row)
... More tags <I>, with possible children tags <I> with possible children and so on - unlimited levels of tree ...
</I>
... More tags <I> ...
</I>
... More tags <I> ...
</I>
... More tags <I> ...
</B>
</Body>
</Grid>

API for server paging and child paging

API method string

GetCfgRequest

(string format = "internal")
Returns sorting, grouping, filter and search settings for download request, without enclosing <Grid> tag.
format can be "internal" or "dtd"
API event bool

OnDownloadPage

(TGrid grid, TRow row, function func)
Called when data for page or row's children are requested.
Returns true to suppress default downloading. If it does return true, must call function func(int result), where result<0 is error code or 0 for ok.
To catch and modify the data after they are loaded use OnDataReceive or OnDataGet event and test their source.Row attribute to get the page.
new 8.1 API event void

OnPageReady

(TGrid grid, TRow row)
Called when page is downloaded and updated and is ready to render.
API method void

DownloadPage

(TRow row, function Func)
Downloads data of page or children of row. Sends to server request with page index or row id and sort, group, filter and search settings.
Alerts server message if any and permitted. Asynchronous function. After finish, calls function Func. function Func (int code).
API method void

ReloadPage

(TRow page)
Clears page data or row's children and reloads them from server.
new 7.0 API method void

LoadPage

(TRow row)
Loads and processes the page data. The page will be fully loaded and prepared for render and rendered if it is visible (due scroll).
To catch the event the page is loaded use OnDataReceive event.
For example you can write such code to download all root pages asynchronously on start:
Grids.OnDataReceive = function(G,IO){ if(IO.Row) G.LoadPage(IO.Row.nextSibling); }