Gantt display objects

TreeGrid documentation

Gantt column Header

One or more lines in header displaying dates

In header you can show one or more lines with dates that are displayed in the chart.
You can specify how the dates will be repeated and the format for the dates.
Up to 5 different header lines can be defined.
Header time/number and format in the first header line: "repeater#format#shift".
The possible values of repeater are the same as GanttUnits, e.g. "w", "d", "h" or "1", "0.5", "2", ...
The format is standard TreeGrid date / time format string for date repeaters, or standard TreeGrid number format string for number repeaters.
The shift (new 6.4) is optional and moves the header by the shift repeater units left, it can be floating point number. It is usually 0.5 to center the label above the position.
The number repeaters and formats are supported since 6.4.
Since 7.0 when shift is not set and repeater is number, the negative numbers are shifted for one unit, so zero is printed twice. Set shift to 0 if you don't want this behavior.
For custom headers (e.g. fiscal year, more years, etc.) use AddGanttUnits and OnGetGanttHeader API methods.
Since 10.0 the count of Gantt headers in unlimited and is set by GanttHeaderCount.
In the default CSS styles the individual headers have this meaning:
1 - main header line, with the important information, can have bigger font.
2 - second header line, it often has inverse colors.
3 - third header line, it can have also inverse colors and / or complementary borders to the second header 2.
4 - standard header with no special meaning and effects.
5 - small header, usually with smaller font.
6 - single header, if the Gantt header has only one line.
Count of available headers in the Gantt chart. How many GanttHeader...X attributes can be defined.
By default there are 6 headers (prior to 13.0 it was 5), GanttHeader1, GanttHeader2, GanttHeader3, GanttHeader4, GanttHeader5, GanttHeader6.
Note the difference to GanttCount, the main bars are indexed from 0, but headers from 1.
Moved to GanttHeader.
Date / time format to format items in the first header line, the same as standard TreeGrid date / time format.
If rounds header date to workdays / work hours, defined by GanttExclude. Only for GanttHideExclude=1.
id of the header row where the header line will be displayed. If not set, the header line will be displayed in main header.
One header row can show more Gantt header lines.
Height in pixels of the header line. Useful when used some special formatting in header or displaying it in more lines.
By default the GanttHeaderX gets the X as its style, CSS class G..GanttHeaderX.
This attribute changes style to different header index, to have e.g. style of 4th header in the first header.
Standard predefined header styles are: 1 - big, 2 - medium inverse, 3 - medium with separator, 4 - medium, 5 - small.
It is possible to set it to any string XXX and define the G..HeaderXXX CSS class, in this case set also GanttHeaderHeightX.
0 - The incomplete header items are shown, 1 - the incomplete header items are replaced by '...'
The trimming '...' is set by <Lang><Format Cont='...' ContLeft='... ' ContRight=' ...'/></Lang> attributes.
Maximal count of cells in all Gantt headers together. If headers contain more cells, error is shown.
Setting this value too high can slow down the grid or even throw JS errors in some browsers, especially in IE.
Called for every date in every Gantt header line to get the caption displayed.
Return the new value or val to not change the original caption. index is the header index (from 1).
date is the first date in the range. nextdate is the first date after the range, units is the range unit width like GanttUnits, width is width of the space for the caption in pixels.
partial is 0 for full range, 1 for range trimmed from left, 2 for range trimmed from right, 3 for range trimmed from both sides. The date and nextdate are the trimmed dates in these cases.
To highlight some header cell by background or another CSS attribute return the val in <div>, e.g. return "<div style='background:red;'>"+val+"</div>";

Background

Marks workdays, weekends or any other dates - for all rows the same

Defined by GanttBackground (date ranges with repeater).
You can color any dates or date range that are periodically repeated as workdays, weekends, working hours and so on and also exact not repeated dates.
The background is the same for whole chart and cannot be set for individual rows.
The background is just visual setting, to exclude some date from Gantt calculation, use GanttExclude instead. Date ranges displayed as background, useful for marking some period repeatedly.
Similar to GanttLines, but with two differences: the GattBackground can be repeated, but can be changed by API only by refreshing the whole Gantt background.
The order of the rendered background is GanttExclude, GanttBackground, GanttLines, GanttBase, GanttFinish. If overlaid, the latter is visible.

The format is: rep1#date1a~date1b#class1;rep2#date2a~date2b#clas2;...
The repeater rep can be one of GanttUnits. If it is missing, the date is not repeated. The date is repeated also before it.
The seconds date in range can be missing to show single line.
(Since 7.0) The class is CSS class defined by GxGanttBackXXX, where Gx is the style prefix like "GW" for White and XXX is the class value.
(Since 7.0) It is possible to limit the repeating, when the date range is wider than the rep, the range is rounded to the rep range and repeated only between the dates.
(Since 7.0) It is possible to set the second date before the first one, it will be updated to correctly fill the repeat range.
Since 8.0 it can be set and displayed different for every row. It can be much slower.
If the value is changed by API, call RefreshGantt (5) to show the changes.
If and how the column GanttBackground is added to the row GanttBackground, if both of them defined.
0 - no, 1 - before, 2 - after
If prints global Gantt background, shown for attributes GanttBackground, GanttExclude, GanttBase, GanttFinish.
Since 13.0 if set to 2 or to 4, it prints background in <svg> to speed up the rendering.It can cause problems for some PDF exporters.
Since 13.2 if set to 1 or 2 it prints the global background once on the grid background, if set to 3 or 4 it prints the global background in every row background - more compatible but remarkably slower.
Since 13.2 the default value was set back to 1 because 2 has problems with PDF exporters.
Maximal count of items in Gantt background. If background contain more items, error is shown.
Setting this value too high can slow down the grid or even throw JS errors in some browsers, especially in IE.
Replaced by repeater in GanttBackground.
GanttBackground will be repeated by these units, can be empty to not repeat. Possible values are the same as GanttUnits.
If GanttBackground contains more date ranges, it should contain more units (one per range), comma separated.
Base background color of the Gantt cell, shown in place where no GanttBackground and GanttExclude piece is active.
If set to cell, it forces rendering all the column GanttBackground and GanttExclude to the cell, so it can remarkably slow down the grid if they contain many pieces.

Line

Background line, e.g. actual date - one or more vertical lines per chart, editable

Lines or date ranges displayed as background, not repeated.
Similar to GanttBackground, but with two differences: the GattLines cannot be repeated, but can be easily changed by API.
The order of the rendered background is GanttExclude, GanttBackground, GanttLines, GanttBase, GanttFinish. If overlaid, the latter is visible.

The format is: flags1#date1a~date1b#class1;flags2#date2a~date2b#class2;...
flags are editing flags, bit array:
The seconds date in range is usually missing to show single line.
class is the line CSS class part, the class is defined as GxGanttLineXXX, where Gx is style prefix, e.g. GW for White style and XXX is class value.
There are 17 basic color classes, case sensitive - Aqua, Black, Blue, Fuchsia, Gray, Green, Lime, Maroon, Navy, Olive, Orange, Purple, Red, Silver, Teal, White, Yellow, these lines are one pixel wide.
There are two next sets for 17 basic colors and two and three pixels wide, e.g. Red2 is two pixels wide and Red3 is three pixels wide.
There is one special class Hidden for not displayed lines - to mark some other line as changeable, e.g. the ganttprogressline.
For example "0#4/26/2014#Blue; 1#4/29/2014#Green3; 0#4/8/2014~4/9/2014#Silver"
Tip string shown for individual lines on mouse hover. The X is line index from 0 in GanttLines.
It can show also the specials: *Start* - start date of the line, *End* - end date of the line, if any.
To dynamically generate the tip text use OnGanttTip API event.
Tip string shown for all lines on mouse hover in not defined the GanttLinesXTip for the individual line.
It can show also the specials: *Start* - start date of the line, *End* - end date of the line, if any.
To dynamically generate the tip text use OnGanttTip API event.
Date format for GanttLinesTip, GanttLinesXTip, GanttBaseTip, GanttBaseAutoTip, GanttFinishTip and GanttFinishAutoTip, values *Start*, *End*
Returns one Gantt line.
index is the line position from 0 in GanttLines. col is the Gantt column or null for the first one.
index can be also -1 to get GanttBase line and -2 to get GanttFinish line.
Returns array as [date1,date2,class,edit], the date1 and date2 are line dates as count of milliseconds since 1/1/1970.
Can be used only when the Gantt is rendered, otherwise manually parse the GanttLines, accessible as grid.Cols[gantt_col].GanttLines
Changes one Gantt line.
index is the line position from 0 in GanttLines. col is the Gantt column or null for the first one.
date1, date2, class, edit are items to change. If set to null, it is not changed.
If set update, updates also the line in fixed rows and rows with custom background or calendar.
Can be used only when the Gantt is rendered, otherwise set the GanttLines directly as grid.Cols[gantt_col].GanttLines.
It is not possible to add new lines, only change existing ones. To add new lines, modify the GanttLines directly and call grid.RefreshGantt(5);
To hide some line, set the date1 to empty string - the line is not deleted, it can be next shown by setting the date1 to some date.
It is possible to use the function to change edit (only) value of GanttBase (index = -1) and GanttFinish (index = -2).
Returns true for success.
Called before change of any Gantt line. Called from SetGanttLine method.
index is line position from 0 in GanttLines,
date1 and date2 are line new dates as count of milliseconds since 1/1/1970. class and edit are new line values.
odate1, odate2, oclass and oedit are actual values of the line.
It is called also for change of GanttBase with index = -1 and for GanttFinish with index = -2.
Return true to suppress the change.
Called after change of any Gantt line. Called from SetGanttLine method. See parameters in OnGanttLineChange.
Moves Gantt line under mouse cursor by mouse dragging. Used for GanttLines, GanttBase and GanttFinish lines.

Mark

Mark line, e.g. actual date - one or more vertical lines per row, not editable

Defined by GanttMark (date ranges).
It is a mark line showing some important date or deadline. It is often the same for whole column, but it need not be.
It is displayed above the other Gantt items, so the line should not be too thick.
It cannot be dynamically changed by a user, only by API.
Other times to mark in chart, useful for displaying actual date or vertically divide chart to bigger units or mark weekends and so on.
It can be column name or date range string "d1~d2;d3~d4;d5;..." (date string (M/d/yyyy hh:mm:ss) or count of milliseconds).
If set to column, the column must be Type='Text'.
These dates do not extend the displayed date range in chart. When the date is outside the actual displayed range in chart, it is not shown.
Since 7.0 the dates can have postfix #class to display in css class GxGanttMarkXXX with the class index. It cannot be used for Mark set as column! For example GanttMark='1/1/2000#2;1/7/2000#5'.
Since 9.1 there is shown image instead of class in case the css postfix is text (not number).
A list of inner html texts for the individual marks. The texts can extend the marked area. Separated by semicolon or by GanttTextsSeparator.
It can be column name or a list of strings.
Mark rounding, to these units will be all dates in GanttMark rounded, possible values are the same as GanttUnits.
To display just thin vertical lines, set it to 'm', for thicker lines higher the value according to actual GanttUnits used.
Path to images for GanttMark when the third parameter in definition is string that represents image.
If the GanttMarkPath is not set, the images are read from actual TreeGrid CSS directory in format GanttLineXXX.png.
If the GanttMarkPath is set (even to empty string), the images are read from this path (relative to actual HTML page) as PathXXX.png
Extension for all GanttMark images (if the css class index is text). Can be set to empty string to not use extension at all.
Default value is "svg" except on IE8 and older where is "gif".
If not set (default) and the GanttMark value is progress line default image "A", "B", "C" or "D", it uses CSS class GanttMarkA/B/C/D instead of the <img>.
If set, it is used instead of Lang.Format.ValueSeparator to separate texts in GanttFlagTexts and GanttMarkTexts. Calculates progress line as GanttMark string for given cell. Use it in formula for GanttMark column to show the progress line as GanttMark.
date is base date of the progress line (as English date string or count of milliseconds since 1/1/1970).
left is name of the left side progress line image (for dates before base date), set it to 0 to never show left side progress line or to 1 for default image 'A'.
right is name of the right side progress line image (for date after base date), set it to 0 to never show right side progress line or to 1 for default image 'B'.
none is GanttMask CSS class used for straight progress line
For type = 0 it shows the progress line only left side to date. For type = 1 it show also right side progress line.
start is tasks start date (string or count of ms). If it is null, it is used value GanttStart.
end is tasks end date (string or count of ms). If it is null, it is used value GanttEnd. If GanttEnd is also not set, it uses duration.
duration is task duration in GanttDataUnits. If it is null, it is used value GanttDuration. Used only if end is not defined.
complete is percent completion (0 - 100). If it is null, it is used value GanttComplete. For 100% complete tasks is never shown left progress line, for 0% complete tasks is never shown right progress line.
It is possible to have more progress lines in chart by calling more these functions like Formula="ganttprogressline(parameters1)+';'+ganttprogressline(parameters2)+';'+ganttprogressline(parameters3)+..."