Sum function does not work with global variable.

[Jim Spooren]

Hello, 

I am very new to node red but i'm trying to figure out how to calculate a sum with my global variable. For some reason it doesnt work. Also see the attached screenshot.

Result 1 gives the following result in the debugger: 25. 

Result 2 gives the following result in the debugger: "[object Object][object Object]"

Could someone please tell me what i'm doing wrong and/or give me an alternative to fix this? Thanks in advance.

the code in the function node:

var ObtainedAantalNee = global.get('GlobalVariableAantalNee');

var ObtainedAantalTotaleStemmen = global.get('GlobalVariableTotaalAantalStemmen');

//var Uitkomst = 0;

var test1 = 15;

var test2 = 10;

msg.payload = ObtainedAantalNee;

var AantalNeeKliks = msg.payload;

msg.payload = ObtainedAantalTotaleStemmen;

var AantalTotaleStemmen = msg.payload;

var Result1 = {payload: test1 + test2};

var Result2 = {payload: ObtainedAantalNee + ObtainedAantalTotaleStemmen};

return [AantalNeeKliks, AantalTotaleStemmen, Result1, Result2];

[Nick O'Leary]

How/where are you setting in global context?

It appears  'GlobalVariableAantalNee' and 'GlobalVariableTotaalAantalStemmen' are Objects and not numeric values you can simply add together.

The fact you return AantalNeeKliks and AantalTotaleStemmen from the Function which are actually the values of GlobalVariableAantalNee and GlobalVariableTotaalAantalStemmen, and the Function hasn't complained means they definitely are msg objects and not numeric values.

My guess is you've stored complete messages under each of those global properties, and its their 'payload' value you want to be adding. So something like the following would work:

var ObtainedAantalNee = global.get('GlobalVariableAantalNee');

var ObtainedAantalTotaleStemmen = global.get('GlobalVariableTotaalAantalStemmen');

msg.payload = ObtainedAantalNee.payload + ObtainedAantalTotaleStemmen.payload;

return msg;

Note that it is good to reuse the msg object the Function receives, rather than create new objects if you don't need need to.

Nick

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[Jim Spooren]

Thank you so much for your quick response! This works like a charm, the .payload did it :) thanks again.

Op woensdag 15 november 2017 14:50:43 UTC+1 schreef Nick O'Leary:

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