Add an var with memory var

Developing Nodes
1

Hello People of node red believers.
I am a problem with adding ( sum ) of an memory variable with a fresh variable like following.

TotalToday = SaveOpname + TotalToday

But is not working ( still get the same sum of the value's )
Meaning of this flow ( function ) is that the value is keep adding on the value before.

example of my function

let TussenVar = {};
let TotalToday = {};
let SaveOpname = {};
let Opname = {};
TotalToday = parseInt(flow.get("TotalToday"));
SaveOpname = parseInt(flow.get("Opname"));
TotalToday = SaveOpname + TotalToday;
msg.payload = TotalToday;
return msg;

I think this is an easy one , but stills failures on this easy flow.

Is there a tric to do what i want ?

this is the flow:

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2

So where do you save TotalToday back to the flow variable?

3

something like this ?

let TussenVar = {};
let TotalToday = {};
let SaveOpname = {};
let Opname = {};
TotalToday = parseInt(flow.get("TotalToday"));
SaveOpname = parseInt(flow.get("Opname"));
TotalToday = SaveOpname + TotalToday;
TotalToday = (flow.set("TotalToday"));
msg.payload = TotalToday;
return msg;

ps: for me is this more than try and error :wink:

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NaN is now the output , but after give a new timestamp on initialise than it give me a output without the sum.

Also not working with this try

let TussenVar = {};
let TotalToday = context.get('TotalToday') || 0;
let SaveOpname = {};
let Opname = {};
TotalToday = parseInt(flow.get("TotalToday"));
SaveOpname = parseInt(flow.get("Opname"));
TotalToday += SaveOpname;
context.set('TotalToday', TotalToday);
msg.payload = TotalToday;
return msg;

4

You are mixing context and flow context storage, also you can not store the opname and retrieve it before it is stored.

let SaveOpname = 0;
let TotalToday  = parseInt(flow.get("TotalToday") || 0);
SaveOpname  = parseInt(msg.payload.power);
msg.payload  = SaveOpname + TotalToday ;
flow.set("TotalToday", msg.payload);
return msg;
5

Yes , I got it in the same time of you E1cid :slight_smile:
Indeed the context and get, set thing always I mixed that :frowning:

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Finaly :smile: that was a part of my life

This is the function that do the correct thing I want:

let TussenVar = {};
let TotalToday = {};
let SaveOpname = {};
let Opname = {};
TotalToday = parseInt(flow.get("TotalToday"));
SaveOpname = parseInt(flow.get("Opname"));
TotalToday += SaveOpname;
flow.set("TotalToday",TotalToday);
msg.payload = TotalToday;
return msg;

1 Like
6

Hello Dimpie,

Welcome to the community and good to see that you found your first solution here. :slight_smile:

I just want to point you to an alternative solution I found in the forum these days to add/ increment easily a value to a global variable:

Might reduce lines in the code :slight_smile:

Cheers
Ranki

7

Hello Ranki, Thanks for that solution. It looks a nice extra for later.
But for now I think its not working in my case. I want to add with a variable. So i try this with Json change node like your post but with an extra variable :

$globalContext("SaveOpname")+$globalContext("Opname")

but give's me every time the same "Opname" Value.
It was a good try for me to learn more about that Json string.

See the flow

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