Hello
Im fairly new to Node Red so the solution may seem obvious, but i just got stuck and can't figure it ou
I want to get a sum of 2 messages - first one comes from a date picker, the second one comes from a dropdown (it let's you choose an hour). I want to sum them to get the exact time of the reading i want to export from a CSV file. Of course the messages come asynchronously so how do i add them after they both change (or when a button is pressed? idk)
Option 1 - Join
Use a join node: See this article in the cookbook for an example of how to join messages into one object.
Flow 1...
input1 --> change-node (set topic "input1") ---+---> join node (set to 3 parts) -->
input2 --> change-node (set topic "input2") ---↑
button --> change-node (set topic "button") ---↑
Option 2 - Context store / retrieve later
Store the values in flow or global context & re-read them when the button is pressed
Flow 1...
input1 --> change node (save payload to flow.input1)
Flow 2...
input2 --> change node (save payload to flow.input2)
Flow 3...
button --> change-node (set msg.input1 to value of flow.input1 & set msg.input2 to value of flow.input2) - now both values are in one message
Okay, I'd like to do the option with the button, but the datepicker and dropdown menu sends a message only when changed. So when I won't change one of them (date or dropdwn because it's already going to be the time want) it will give me an error because the "next" function won't have a message input right? How do i solve that then?
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