JsonLength (Json Length Selector)
This selector returns the length of the first object or array that matches the key.
Figure 88. JsonLength properties
You add this selector to a station by expanding in the palette and dragging the JsonLength to a message router in the Nav tree.
In addition to the standard property (Enabled), these properties support the JsonLength.
| Property | Value | Description |
|---|---|---|
| Last Result | read-only | Reports the results of the alarm acknowledgment to allow for logging or post-processing activity. Example output:
|
| Last Result Time | read-only | Reports when the handler ran last. |
| Last Input | read-only | Reports the last message routed to a component. |
| Status | read-only | Reflects the current status of the component.
Ok indicates the JSON processed successfully. fault indicates the JSON did not process for any reason, such as invalid JSON or missing expected values in the JSON. |
| Out | read-only | Displays the result. |
| Key | text (defaults to messageType) | Defines which part of the incoming message to switch on) |
Actions
These actions are available when you right-click on the JsonLength.
Figure 89. JsonLength action buttons
- Route causes this component to process the
Stringparameter and update the Out slot. - Run Last Input executes the last input again.
- Clear Output sets the Out slot of this component to an empty string.