# Data Grid

A Data Grid

The key element is the data source, where the query or analytic is defined.

The Data Grid also has settings for search, filtering, editing cells, insert and delete rows, sorting, grouping and custom column display.

## Set up

1. Assign a data source.

2. Select filtering option to use.

3. Format your column data; use the Multi-Column Editor to make shared changes across columns.

## Basics

Data Source
Data sources
Filtering

Three options:

option effect
Quick Search Global search of all data columns; e.g. for selected text, number, date or time
Column Filters Search on selected column. Additional filter options available with custom filters.
Advanced Column Filters Search on selected column, support for boolean operators AND, OR, - (NOT), and * (wildcard all).
Disabled No filters

option effect
* Wild card, returns everything
AND Searching for J AND M would return a Jim but not a John or Mary
OR Search for J OR M would return a Jim, John and Mary
- Acts as a NOT. Search for * -Jim -John would return all bar Jim and Mary

Advanced Column Filtering is not available for columns using custom filters.

Advanced Column Filtering can also used with server side filtering.

Show Paging Control

When checked, displays pagination controls: used for large data sets

Enable Grouping
When checked, users can group data together: subtotals can be applied with Summary Row For Groupings
Auto Collapse Grouping
When checked, the dashboard is loaded with Data Grid groupings in collapsed form. Grid groupings are configured in Grouping Columns
Keep NonExistent Columns

Non-existent columns are employed when working with a large number of queries. If a Data Source is changed, the prior column configurations from the original will be kept if this control is checked.

Dynamic queries

Dynamic queries which don’t have fixed column definitions can set Keep NonExistent Columns to retain configuration options; e.g. column formatting. In this scenario, the * wildcard would be used in the Data Field Name. Hybrid wildcard usage is also supported; for example 'Data*' will return all columns with 'Data'.

Custom Layout

When checked, the Data Grid will have a button to summon the Configuration dialog.

The Configuration dialog lets users change the display of columns in the Data Grid.

Configuration dialog

All columns are available to users

Hidden columns will be visible in the Available Columns list. This may not be desirable if a hidden column stores a calculation or highlight rule operator. In such instanced it may be necessary to disable Custom Layout.

User configuration is saved on exiting the dashboard and will be available on next login.

Retain Relative Column Widths on Reload
Check control to continue with relative width on display columns (relative widths are applied only when columns fit allocated horizontal space - when horizontal scrollbar is not visible)
Edit Mode

One of enabled, disabled, or instant. When enabled, a user can edit data by clicking the Edit button in the top-right corner, making each cell editable. When instant, boolean values in the table will be rendered as checkboxes that the user can toggle to instantly edit.

Editing data with Edit Mode = enabled

Editing data with Edit Mode = instant

In both cases, an update query must be used.

Enable Insert/Delete
Only used with an update query.
Sort Column
Sort Order
Define which column, and direction, to sort data on dashboard load
KDB Filter String
Used in server side filtering.
Filter on Enter
When checked, user will have to press ENTER to return a filter result. Default behavior is to smart filter on typing.
Scroll Row
Stores a scroll value required for PDF Creation
Experimental Mode
Improved data handling efficiency and performance with high volume data
Virtual Scroll
Default is disabled; all data is loaded to the dashboard from the Data Source. When enabled, viewed data is loaded as required; for streaming or frequently changing data and update queries, uncached is recommended, cached enables backend data management.

## Columns

Besides individual column settings, settings for all columns can be defined in the Multi Column Editor:

Select columns on the left using Ctrl-click on columns.

Next select properties (settings) on the right to be applied across the selected columns.

Columns can be removed from a Data Grid by clicking the trashcan icon

## Column

Defines how data is formatted in each column.

User Defined

When checked, the selected column will remain in the Data Grid if the selected column variable is removed from the query. A User Defined query is effectively a 'lock' on the column

User Defined checked for missing Data Source variable

The User Defined column will show as an empty column in the Data Grid if the User Defined column variable is missing in the query.

Data Field Name

A column or dynamic column from the Data Source

Dynamic column syntax

use * or regex (e.g. CPUCore*, FXpair*EUR, /symbol|sym/i )

Display Name

Columns with Display Names: Symbol, Counter Party, %, and Start Date

Wildcard '*' usage

Display Name is set to wildcard when Data Field Name uses the wildcard. Hybrid names using a mix of name label and wildcard are also supported; for example, Data Field Name set to 'Data*' with Display Name of 'Result *' will return columns including 'Data' with 'Result ' in the Display Name.

Provides a rollover text description for the column; useful if existing column title is clipped on browser resize.
Width (relative)

Column width relative to other columns, e.g. columns with a relative width of 20, 10, 5, 1 will scale to column widths of 55% (i.e. 20/(20+10+5+1)), 28%, 14% and 3%

Columns will resize with the browser window.

Min Width (px)

Pixels: the minimum width for a column

Using Width (relative) and Min Width (px) together

Width (relative) uses a default value based on the data Type in the column; in the case of a Data Grid the default Width (relative) and Min Width(px) are the same. There are two priority rules for Width (relative) and Min Width (px):

1. If the screen is resized so that a scroll bar appears, Width (relative) will be disabled and only Min Width (px) used. If a further resize removes the scrollbar, Width (relative) will again be applied.
2. If the Width (relative) is set to zero, only Min Width (px) will be applied.

If Width (relative) (irrespective of scrollbar) narrows Data Grid column widths to less than Min Width (px), then Min Width (px) will be used.

Group apply Width changes

When using Width (relative) or Min Width (px) it may be helpful to use the bulk parameter adjuster; click

Ctrl+select the columns to change, then adjust the required parameter(s) to have the value applied to all selected columns

Text Align
Horizontal alignment of values in their cells
Sortable

When checked, clicking on column header will toggle between ascending and descending sorts

Format
for the data in the column, e.g. DateTime, Percentage, Sparkline
Precision
The number of decimal places show for numeric data
Hide Trailing Zeroes
When checked, suppresses trailing zeroes for numeric data
Currency Symbol

Columns with prefixed currency symbols
Date Format
Time Format
Where Format is Date, Time, or DateTime the data is formatted with these two settings

Date Format, Time Format, and a formatted DateTime column
Negative Color
Set color for negative values in column
Highlight Change
When Highlight Changes is enabled, higher than previous value changes will be highlighted in green and lower values in red. The length of time for the highlight is set by Highlight Change Duration
Highlight Rules
Highlighting highs, lows and ranges

Checkboxes Highlight Min Value, Highlight Max Value, and Range Highlight apply colors to highlight values:

Columns with Min Value Color, Max Value Color, and Range Color applied

Invert Range Color
Flip range color usage; dark shade for high values, light shade for low values
Percentage Color

A color, used for mini-bars when Format is Percentage

Colors can be View State Parameters

Min Value Color, Max Value Color, Range Color, and Percentage Color can be View State Parameters.

When checked, the column cannot be edited
Selectable
Checked by default; column cells cannot be selected when unchecked
Template
Apply HTML customizations with Handlebar helpers; for example:
<font color="blue">{{column name}}</font>

where {{column name}} is the reference name for the column from the data source.

Sparkline Options
Configuration for Sparklines
Hidden
Data column is hidden.
When Hidden columns are no longer hidden
If Full Excel Export is enabled, all Hidden columns will be downloaded as part of the export. Hidden columns are also available under Custom Layout.
Footer

Adds a column sub-total value for weighted average, average, count, sum or none.

Footer Weight
Applies a weighting to current column by selected data source variable. For this to be enabled, Footer must be set to weighted average.

## Selection & Routing

Selection Mode
Select from Area, Single Row, Multi Row or Cell
Row ID Column
Define from the data source
Selected Row
Selected Column
Selected Cell Value
Assign view state parameters to each attribute when Cell is selected.
When checked, row selection highlight will retain view on screen during scroll event
Default Fallback on Deselect
When checked, default View State Parameter values will be used (if set) in the absence of a row select
Checkbox Alignment
Position of data row selection check boxes; select from none, left or right

### Keyboard Shortcuts

A set of keyboard shortcuts for Selection Mode Area; allows for bulk selection of cells and rows.

shortcut description
Shift + End Select to end of column from cell
Shift + Home Select to top of column from cell
Shift + Page Up Select from cell to each page up instance
Shift + Page Down Select from cell to each page down instance
Shift + Click Select from cell to click-select-cell
Drag-select-rows Select multiple rows

## Tooltip

Position
Select from none, right, left, cursor
Template
Templates
Use Formatted Cell Value
When the "Use Formatted Cell Value" property is checked then tooltip uses the formatted value from column template otherwise if unchecked uses the raw cell value.

## Grouping columns

A Grouping Column groups Data Grid rows by their values in that column. Specifying further grouping columns repeats this within each group.

Grouping by sym and counterParty

Dashboard users can also create groupings on the fly by dragging a column header into the space directly above the column headers:

Dragging a column header to set a grouping column

## Summary Row for Groupings

Grouping Columns reorganises the Data Grid layout. Summary Row for Groupings adds simple mathematical calculations to the groups.

‘Leverage’ calculated for each group

Aggregate Function
The mathematical function to apply: average, sum, min, max or weighted average (extra column will appear)
Column
The column on which the calculations will be made
Label
The text label to use for the calculation
Color
The font color for the grouping

## Highlight rules

Mark changes in data grid values with color; select between Gradient or monotone Discrete colors.

Highlight Rules in operation

Name
The name of the rule
Target
The column on which the rule will act. Can be any column in the Data Grid: does not have to be the column using the operator.
Condition Source
Condition Operator
Condition Value
Discrete highlight rule Highlight Rules
Rule Min
Rule Max
Rule Limit
Gradient highlight rule. Rule Limit restricts highlights to values between Rule Min and Rule Max only; values outside of this range have no highlights applied. Use Color Palette to define gradient color highlights.
Color
The text color when rule is true
Background Color
Background cell color when rule is true
Border Color
Cell border color when rule is true
Icon
Icon to appear when rule is true
Icon Color
Color for the icon (if used) when rule is true
Apply Palette To
Gradient highlight colors applied to background, text, border or icon

### Color Palette

Define colors used by Gradient highlight; low to high values, top to bottom.

## Custom filters

Introduce client-side advanced filters for columns covering text, numeric and datetime formats.

Custom Filters are available only when Filtering is set to Column Filters or Advanced Column Filters.

Filtering is only applied to viewable data; paging will limit results to current page.

Custom Filters

Select a custom filter for each columns

filter description
Selection Filter dropdown; check available data options to display.
Server Selection Server Selection Filtering
Number Support for filter options: <, >, >=, <=, =, ==, != (exclude)
Date Time Select for Date or Time using standard operators: <, >, >=, <=, =
Disabled No filtering

Examples:

Symbol starts with EUR or USD:
Symbol starts with EUR, without EURAUD:
Symbol starts with EUR, without EURAUD and EURCAD:
Symbol ends with CAD:
Selected numbers:
Range between 10000 and 20000000:
Ignore null values:
Selecting Four symbols
Range between 25 and 75
Range outside 25 and 50
Return 25 and 50 only

Filtering variables with !=

When the exclusion function != is used, all values – including column cells with null data – will be returned with the exception of the value defined by !=

### Server selection filtering

Server selection should be used when data is not fully loaded to the client; for example, when using server-side paging or Server-side Filtering via the KDB Filter String.

Server selection uses a data source to return all member items of the filtered column.

## Server-side filtering

1. Set Filtering to Column Filters or Advanced Column Filters.

2. Create three view state parameters for Sort Column, Sort Order and KDB Filter String; these can be grouped in the view state parameter menu. View states for Sort Column and Sort Order are of string or symbol. The KDB Filter String must be of type string.

3. Define a data source to be filtered. The following code snippet uses dfxQuote as the target data set; replace as appropriate:

   {[sortCol;sortOrder;filterString]
res:.dfilt.apply[dfxQuote; filterString];
if[all not null (sortOrder; sortCol);
sortOp:(descendingascending!(xdesc; xasc))sortOrder;
res:sortOp[sortCol;res]
];
:res;
}

## Style

Style for common settings

Row Height
Even Row Background & Odd Row Background
Background colors of the even and odd rows
Selected Row Background
When Enable Row Selection is checked, the background color of the selected row
Font Family
Font family for column headers and rows
Font size
Font size for rows (css format), e.g. 18px, 0.8em, 80%, larger

## Sparklines

To display Sparklines, set Column Format to Sparkline and modify Sparkline Options using JSON editor

Query example for Line chart ([] ix:til 100; list:{(60?30)}each 1_til 101)

These chart types are supported: line, bar, pie, tristate, discrete, bullet, box

### Composite sparklines

([] twoDatasets: {((20?10);(20?10))}each 1_til 101)
[{
"type": "bar",
"height": 50,
"barWidth": 23
},
{
"type": "line",
"composite": true,
"fillColor": "rgba(0,255,0, 0.2)",
"lineColor": "#00ff00"
}]

### Common options

These options can be set for most of the supported chart types.

option semantics
type One of line (default), bar, tristate, discrete, bullet, pie or box.
width Width of the chart: defaults to auto. May be any valid CSS width: 1.5em, 20px, etc. (Using a number without a unit specifier won’t do what you want.) This option does nothing for bar and tristate chars (see barWidth).
height Height of the chart. Defaults to auto: line height of the containing tag.
lineColor Used by Line and Discrete charts to specify the color of the line drawn as a CSS values string.
fillColor Specify the color used to fill the area under the graph as a CSS value. Set to false to disable fill.
chartRangeMin Specify the minimum value to use for the range of Y values of the chart. Defaults to the minimum value supplied.
chartRangeMax Specify the maximum value to use for the range of Y values of the chart. Defaults to the maximum value supplied.
composite If true then don’t erase any existing chart attached to the tag, but draw another chart over the top. Width and height are ignored if an existing chart is detected. NB: You’ll usually want to lock the axis on both charts using chartRangeMin and chartRangeMax if you want the same value on each chart to occupy the same point.
enableTagOptions If true then options can be specified as attributes on each tag to be transformed into a sparkline, as well as passed to the sparkline() function. See also tagOptionPrefix.
tagOptionPrefix String that each option passed as an attribute on a tag must begin with. Defaults to spark.
tagValuesAttribute The name of the tag attribute to fetch values from, if present: defaults to values.
disableHiddenCheck Set to true to disable checking for hidden sparklines. This can be beneficial if you know you’ll never attempt to draw a sparkline into a hidden parent element, as it avoids a browser reflow for the test, increasing rendering performance. Defaults to false.

#### Range maps

Several parameters, such as colorMap and tooltipLookupValues, accept a range map as a parameter. As the name suggest, it maps ranges of numbers to values. For example:

{
1: "red",
"2:9": "yellow",
"10:": "red"
}
This would map 1 to red, values of 2 through 9 (inclusive) to yellow and values of 10 and higher to "red"

### Line charts

Line charts are the default chart type, but to specify the type explicitly set an option called type to line.

option semantics
defaultPixelsPerValue Defaults to 3 pixels of width for each value in the chart.
spotColor The CSS color of the final value marker. Set to false or an empty string to hide it.
minSpotColor The CSS color of the marker displayed for the mimum value. Set to false or an empty string to hide it.
maxSpotColor The CSS color of the marker displayed for the maximum value. Set to false or an empty string to hide it.
valueSpots Specifies which points to draw spots on, and with which color. Accepts a range. For example, to render green spots on all values less than 50 and red on values higher use {":49": "green", "50:": "red"}
highlightSpotColor Specifies a color for the spot that appears on a value when moused over. Set to null to disable. Defaults to #f5f.
highlightLineColor Specifies a color for the vertical line that appears through a value when moused over. Set to null to disable. Defaults to #f22.
lineWidth In pixels (default: 1) – Integer
normalRangeMin, normalRangeMax Specify threshold values between which to draw a bar to denote the ‘normal’ or expected range of values. For example the green bar might denote a normal operating temperature range
drawNormalOnTop By default the normal range is drawn behind the fill area of the chart. Setting this option to true causes it to be drawn over the top of the fill area
xvalues See below
chartRangeClip If true then the Y values supplied to plot will be clipped to fall between chartRangeMin and chartRangeMax. By default chartRangeMin/Max just ensure that the chart spans at least that range of values, but does not constrain it.
chartRangeMinX Specifies the minimum X value of the chart
chartRangeMaxX Specifies the maximum X value of the chart

See also all of the common options above, that can also be used with line charts

By default the values supplied to line charts are presumed to be y values mapping on to sequential (integer) X values. If you need to specify both the X and Y values for your chart, use an array of arrays: ((1; 3); (2; 4); (5; 3))

You can also specify a value of null to omit values from the chart completely.

### Bar charts

(10; 8; 9; 3; 5; 8; 5)

Set the type option to bar to generate bar charts. Values can be omitted by using the null value instead of a number.

option semantics
barColor CSS color used for positive values.
negBarColor CSS color used for negative values.
zeroColor CSS color used for values equal to zero.
nullColor CSS color used for values equal to null. By default, null values are omitted entirely, but setting this adds a thin marker for the entry. This can be useful if your chart is pretty sparse: perhaps try setting it to a light gray or something equally unobtrusive.
barWidth Width of each bar, in pixels (integer).
barSpacing Space between each bar, in pixels (integer).
zeroAxis Centers the Y-axis at zero if true (default).
colorMap A range map to map specific values to selected colors. For example if you want all values of -2 to appear yellow, use colorMap: { "-2": "#ff0" }. You may also pass an array of values here instead of a mapping to specify a color for each individual bar. For example if your chart has three values 1, 3, 1 you can set colorMap=["red", "green", "blue"]
stackedBarColor An array of colors to use for stacked bar charts. The first series will use the first value in the array, the second series will use the second, etc.

See also all of the common options above, that can also be used with bar charts

Version 2.0 adds support for stacked bar charts. Values for each data series in the chart can be separated by colons if passed by HTML, or as an array of arrays.

For example, to draw series one with values of 1,2,3,4 and series 2 with values of 4,3,2,1: ((1; 4); (2; 3); (3; 2); (4; 1))

### Tristate charts

(1; 1; 0; 1; -1; -1; 1; -1; 0; 0; 1; 1)

Tri-state charts are useful to show win-lose-draw information, such as the SF Giants recent game results above. You can also use the colorMap option to use different colors for different values, or for arbitrary positions in the chart.

Set the type option to tristate to generate Tristate charts.

option semantics
posBarColor CSS color for positive (win) values.
negBarColor CSS color for negative (lose) values.
zeroBarColor CSS color for zero (draw) values.
barWidth Width of each bar, in pixels (integer).
barSpacing Space between each bar, in pixels (integer).
colorMap A range map to map specific values to selected colors. For example if you want all values of -2 to appear yellow, use colorMap: { "-2": "#ff0" }.

As of version 1.5 you may also pass an array of values here instead of a mapping to specifiy a color for each individual bar. For example if your chart has three values 1, 3, 1 you can set colorMap=["red", "green", "blue"].

See also all of the common options above, that can also be used with Tristate charts

### Discrete charts

(4; 6; 7; 7; 4; 3; 2; 1; 4; 4; 5; 6; 7; 6; 6; 2; 4; 5)

Discrete charts provide a separated thin vertical line for each value.

Set the type option to discrete to generate Discrete charts.

option semantics
lineHeight Height of each line in pixels. Defaults to 30% of the graph height.
thresholdValue Values less than this value will be drawn using thresholdColor instead of lineColor
thresholdColor Color to use in combination with thresholdvalue.

See also all of the common options above, that can also be used with discrete charts

### Bullet graphs

(10; 12; 12; 9; 7)

Supplied values must be in this order: target, performance, range 1, range 2, range 3, …

Set the type option to bullet to generate Bullet graphs.

option semantics
targetColor The CSS color of the vertical target marker.
targetWidth The width of the target marker in pixels (integer).
performanceColor The CSS color of the performance measure horizontal bar
rangeColors Colors to use for each qualitative range background color. This must be a JavaScript array, e.g. ["red","green", "#22f"].

See also all of the common options above, that can also be used with bullet charts

### Pie charts

(1; 1; 2)(20; 50; 80)

Set the type option to pie to generate Pie charts.

These little pie charts tend only to be useful only with 2 or 3 values at most.

option semantics
sliceColors An array of CSS colors to use for pie slices.
offset Angle in degrees to offset the first slice. Try -90 or +90.
borderWidth Width of the border to draw around the whole chart, in pixels. Defaults to 0 (no border).
borderColor CSS color to use to draw the pie border. Defaults to #000.

See also all of the common options above, that can also be used with Pie charts

### Box plots

(4; 27; 34; 52; 54; 59; 61; 68; 78; 82; 85; 87; 91; 93; 100)

Set the type option to box to generate Box plots.

option semantics
raw If set to false (default) then the values supplied are used to calculate the box data points for you. If true then you must pre-calculate the points (see below).
showOutliers If true (default) then outliers (values > 1.5 × the IQR) are marked with circles and the whiskers are placed at Q1 and Q3 instead of the least and greatest value.
outlierIQR Set the inter-quartile range multipler used to calculate values that qualify as an outlier. Defaults to 1.5.
boxLineColor CSS line color used to outline the box.
boxFillColor CSS fill color used for the box.
whiskerColor CSS color used to draw the whiskers.
outlierLineColor CSS color used to draw the outlier circles.
outlierFillColor CSS color used to fill the outlier circles.
medianColor CSS color used to draw the median line.
target If set to a value, then a small crosshair is drawn at that point to represent a target value.
targetColor CSS color used to draw the target crosshair, if set.
minValue If minvalue and maxvalue are set then the scale of the plot is fixed. By default minValue and maxValue are deduced from the values supplied.
maxValue See minValue.

See also all of the common options above, that can also be used with Box plot charts

As noted in the options above, by default raw is set to false. This means that you can just pass an arbitrarily long list of values to the sparkline function and the corresponding box plot will be calculated from those values. This is probably the behavior you want most of the time.

If, on the other hand, you have thousands of values to deal with you may want to pre-compute the points needed for the Box plot. In that case, set raw=true and pass in the computed values. If showing outliers, supplied values of:
low_outlier, low_whisker, q1, median, q3, high_whisker, high_outlier. Omit the outliers and set showOutliers to false to omit outlier display.

### Interactive sparklines

Version 2.0 of the plugin introduces support for interactive sparklines in the form of tooltips, mouseover highlighting and click interaction for all supported types of sparkline.

If you’re happy with the default look and feel of the tooltips, you can skip this entire section.

Options to control sparkline interactions:

option semantics
disableInteraction Set to true to disable all sparkline interactivity, making the plugin behave in much the same way as it did in 1.x Defaults to false.
disableTooltips Set to true to disable mouseover tooltips. Defaults to false.
disableHighlight Set to true to disable the highlighting of individual values when mousing over a sparkline. Defaults to false.
highlightLighten Controls the amount to lighten or darken a value when moused over. A value of 1.5 will lighten by 50%, 0.5 will darken by 50%. Defaults to 1.4.
highlightColor If specified, then values that are moused over will be changed to this color instead of being lightened.
tooltipClassname Specifies a CSS class name to apply to tooltips to override the default built-in style.
tooltipOffsetX Specifies how many pixels away from the mouse pointer to render the tooltip on the X axis.
tooltipOffsetY Specifies how many pixels away from the mouse pointer to render the tooltip on the Y axis.
tooltipChartTitle If specified then the tooltip uses the string specified by this setting as a title.
tooltipFormat A format string or spformat object (or an array thereof for multiple entries) to control the format of the tooltip.
tooltipPrefix A string to prepend to each field displayed in a tooltip.
tooltipSuffix A string to append to each field displayed in a tooltip.
tooltipSkipNull If true then null values will not have a tooltip displayed Defaults to true.
tooltipValueLookups An object or range map to map field values to tooltip strings. For example you may want to map -1, 0 and 1 to the strings Lost, Draw, Won.
tooltipFormatFieldlist An array of values specifying which fields to display in a tooltip and in what order. Currently only useful for Box plots. See below for more details.
tooltipFormatFieldlistKey Specifies which key holds the field name to reference above. For Box plots this should be field.
numberFormatter Pass a JavaScript function to control how numbers are formatted in tooltips. The callback will be passed a number to format and must return a string. Default behavior is to format numbers to Western conventions.
numberDigitGroupSep Character to use for group separator in numbers 1,234 for L10n purposes. Defaults to the comma ,.
numberDecimalMark Character to use for the decimal point in numbers for L10n purposes. Defaults to the period ..
numberDigitGroupCount Number of digits between the group seperator in numbers for L10n purposes. Defaults to 3.

### Formatting tooltips

The tooltipFormat and tooltipValueLookups options provide the main methods of formatting the text displayed for each value in a toolip.

The tooltipFormat is applied whenever the mouse is moved over a value. Various fields enclosed between double curly braces in the format string are substituted depending on the type of sparkline in use. For example, the default format string for line charts is:

{{prefix}}{{y}}{{suffix}}

color is derived from the color of the line being drawn.
prefix and suffix and set by setting the tooltipPrefix and tooltipSuffix items.
y represents the Y value of the point under the mouse. x can also be used if useful.

The supported fields for the different types of sparklines include:

• All types: prefix, suffix as set by tooltipPrefix and tooltipSuffix options
• Line: color, fillColor, x, y, isNull (true if a null value)
• Bar: value (the value under the pointer), color, isNull
• Tristate: value (the value under the pointer), color, isNull
• Discrete: value, isNull
• Pie: value, percent (number between 0 and 100), color (of the moused-over slice)
• Bullet: value, fieldkey, isNull
• Box: field and value. Field may be one of lq (lower quartile), med (median), uq (upper quartile), lo (left outlier), ro (right outlier), lw (left whisker) rw (right whisker)