Binding Expression
The binding expression is written in Iotellect Expression Language. This means it may include references which will be resolved when the expression is evaluated.
Binding Expression Resolution Environment: | |||
For relative models, dashboards, and other resources: a context that a relative resource attached to. For absolute models, dashboards, and other resources: resource’s own context. For instantiable models: model’s instance context. | |||
Widget input parameters table for a widget binding expression. None for a model or dashboard binding expression. | |||
0 | |||
Standard variables only. If the binding was activated by an event, the following event properties can also be accessed via environment: | |||
Variable Name | Value Type | Description | |
|---|---|---|---|
id | Long | Unique ID of the event. | |
context | String | Full path to the event's context. | |
event | String | Name of the event. | |
level | Integer | Event level. | |
time | Date | Event timestamp. | |
acknowledgements | Data Table | Event acknowledgements table. | |
enrichments | Data Table | Event enrichments table. | |
value | Data Table | Data Table containing event-specific data. | |
Widget binding expression of a widget running inside Iotellect Client or Web UI can access the following variables: | |||
Variable Name | Value Type | Description | |
location | Data Table | Widget Window Location | |
dashboard | Data Table | Widget Dashboard Properties | |
References
Binding expressions in context bindings may include references that point to context variables, functions, and their fields or properties.
More information about standard reference format and resolving algorithm may be found in the Standard References section.
Server Binding Expression Example
"User: " + {users.admin:childInfo$firstname}
This expression includes a reference (enclosed in curly brackets), and evaluates to a string which results from concatenating the "User: " string literal and the string which is contained within the firstname field in the childInfo variable of the admin user's context (the path of this context is users.admin). If the Administrator's first name is Charlie, this expression will evaluate to User: Charlie.
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