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Knowledge Base Articles
Data Keys are enclosed in the "@" character when utilized by components in the report. They may be typed manually, or dragged directly from the Key Browser.
Keys that contain a single value will create a Text Shape when dragged onto the report.
Keys that represent datasets will create a Table component, and configure the Data Key property to use the key.
In the Key Browser, the Show Calculations property will add several aggregates to each key. These allow your reports to easily display things like the total of a key. These calculations are typically used in the summary row on the Table component.
Once Show Calculations is enabled, the Key Browser will refresh, and each key will be expandable. Expanding a key will show the available calculations.
Show Calculations Disabled
Show Calculations Enabled
Calculation Keys work like any other key: they may be dragged onto the report, and utilized in Keychain Expressions.
There are two ways to configure a dynamic data key. Note that the syntax of keys differs in Dynamic Data Keys: the "@" are omitted, as demonstrated below.
The easiest approach is by simply dragging a data key from the Key Browser directly to a property on a report component.
Data Keys are relative, and use 'dot notation' to reference children. Meaning, if we have a nested data structure, we can use Data Key paths (also known as Keychains) to reference the nested data. In the key browser image below, we have a nested data source called Downtime. Downtime contains a number of columns, and then contains a reference to additional data called
runInfo. If we wanted to access the highlighted
operator data, we could use the keychain dot notation in the Designer - @Downtime.runInfo.operator@. Nested data sources are outside the scope of this page, but you can learn about Data source nesting in the Nested Queries section.
You can reference an individual object in a list using standard array indexing syntax (brackets) like this:
@dataSource.columnName@, where "dataSource" is a data source that contains a child data key named
columnName. Assuming a data source with the values listed below, we can retrieve the value of "Second Row" by specifying index
1 and the column
indexColumn, stringValue 0, "First Row" 1, "Second Row" 2, "Third Row" 4, "Fourth Row"
Colors may be references in Keychain Expressions in several ways.
First, hexadecimal case-insensitive color codes may be used. The code must be wrapped in quotation marks to be evaluated correctly. Note that the color change will only appear when the report is executed. The easiest way to test the expression is to switch to the Preview Panel.
Below we see a Blue hexadecimal code of "0000FF" is used on the Fill Color of a Rectangle. The Fill Color on the Rectangle was originally set to White. Because the expression will not evaluate in the Design Panel, the Rectangle will appear as a White color.
However, switching over to the Design Panel will generate the report, and evaluate the expression. This in turn returns a Blue Fill Color.
The 7th and 8th digits may be added to specify an alpha channel, or the opacity of the color: 00 is fully transparent, while FF is fully opaque. Below, we see a similar rectangle overlapping an ellipse, but with a code of "0000FF40" . This represents ~25% opacity, so objects behind the rectangle will be visible, and the fill color will only be slightly opaque.
You may also leverage Report Parameters to specify colors. This typically involves creating a parameter with a string datatype, and using the color expression function. Once created, you can simply create a dynamic data key reference on the property by dragging the parameter from the Key Browser onto the property in the Property Inspector. This way, you can have several components use the same color, and modify the color in a single location.
Additionally, case-insensitive string color names may be used to return a color. Again, the value must be wrapped in quotation marks.
The following string values may be used:
Zero opacity. Similar to disabling the Fill property.