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(Classic) Change node - Setting and triggering variables
- Katarzyna Stodolny
With change node, it is possible to save messages that are coming out of the nodes and reuse them.
Use of variable
The context object - stores data inside a single node,
The flow object - stores data for a sing flow tab,
The global object - stores data for the whole logic.
This article will cover knowledge about flow and global objects.
A node used to set the message as a variable is a change node.
It can both, set a flow.variable to msg.payload (1) and
set a msg.payload to flow.variable (2).
(1) To set a variable flow.var_01 as a value of msg.payload:
The value of the variable (var_01) will be overwritten and the value of the original message will be passed on without modification.
For example, if the message with the value “100” will come into a node, it will be saved as a value of a variable.
(2) To change the incoming message into a variable, the “Set” rule has to be used in the other way
Now the output of the change node will be the value which is stored as a variable (var_01).
Every incoming message will be changed into a value of a variable.
Checking the value of variables
The value of the flow is shown in the “context” tab.
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Use cases
HCL
In logic when the presence detection has to trigger a value from the Intensity Scheduler (ES_CCT node).
https://glamox.atlassian.net/l/cp/djTKua8c
Daylight harvesting blocker
Turning ON daylight harvesting at a scheduled time.
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