Function "if" why is not work

General
1

I have this flow...

[{"id":"229f5611c9af1f6e","type":"tab","label":"FVE - CELL SATUS","disabled":false,"info":"","env":[]},{"id":"11f0130edf74e467","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 2.9","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"2.9","payloadType":"jsonata","x":150,"y":360,"wires":[["14d6e162ec373377"]]},{"id":"b92accaf1dfcf58f","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 3.0","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.0","payloadType":"jsonata","x":150,"y":400,"wires":[["14d6e162ec373377"]]},{"id":"863ff59a6ff0566f","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 3.1","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.1","payloadType":"jsonata","x":150,"y":440,"wires":[["14d6e162ec373377"]]},{"id":"1d0f2908b0cd6c99","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 3.2","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.2","payloadType":"jsonata","x":150,"y":480,"wires":[["14d6e162ec373377"]]},{"id":"0425d641f43661b7","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 3.3","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.3","payloadType":"jsonata","x":150,"y":520,"wires":[["14d6e162ec373377"]]},{"id":"c6b0af4e2615be44","type":"inject","z":"229f5611c9af1f6e","name":"cell_min 3.45","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.45","payloadType":"jsonata","x":150,"y":560,"wires":[["14d6e162ec373377"]]},{"id":"5e1409f01ce0c8c6","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 2.9","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"2.9","payloadType":"jsonata","x":150,"y":80,"wires":[["3bd2e60daacc5d57"]]},{"id":"c61fdb92442da94e","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.0","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.0","payloadType":"jsonata","x":150,"y":120,"wires":[["3bd2e60daacc5d57"]]},{"id":"ee99d849ae07ce95","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.1","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.1","payloadType":"jsonata","x":150,"y":160,"wires":[["3bd2e60daacc5d57"]]},{"id":"92d111892f16f6f7","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.2","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.2","payloadType":"jsonata","x":150,"y":200,"wires":[["3bd2e60daacc5d57"]]},{"id":"01d819e4d42e154d","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.3","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.3","payloadType":"jsonata","x":150,"y":240,"wires":[["3bd2e60daacc5d57"]]},{"id":"7f70490197626bd9","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.45","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.45","payloadType":"jsonata","x":150,"y":280,"wires":[["3bd2e60daacc5d57"]]},{"id":"3bd2e60daacc5d57","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":280,"wires":[["09c1dc6daf0ae65a"]]},{"id":"14d6e162ec373377","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":560,"wires":[["d65e3c691b372797"]]},{"id":"09c1dc6daf0ae65a","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":340,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"d65e3c691b372797","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":500,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"8f99cbd4688ccde4","type":"debug","z":"229f5611c9af1f6e","name":"debug_percentage","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":450,"y":420,"wires":[]},{"id":"6b139a7965a247e0","type":"function","z":"229f5611c9af1f6e","name":"function","func":"var outputMsg = 0;\nvar batt_cell_max = 0;\nvar batt_cell_min = 0;\n\nif (msg.topic == \"cell_max\") {\n batt_cell_max = { payload: msg.payload, topic: \"my_topic_cell_max\" };\n }\n else if (msg.topic == \"cell_min\")\n {\n batt_cell_min = { payload: msg.payload, topic: \"my_topic_cell_min\" };\n }\n else if (batt_cell_max > 50)\n {\n outputMsg = batt_cell_max;\n return outputMsg;\n }\n else if (batt_cell_max <= 50)\n {\n outputMsg = batt_cell_min;\n return outputMsg;\n }\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":700,"y":420,"wires":[["367a2b647ceb7d46"]]},{"id":"367a2b647ceb7d46","type":"debug","z":"229f5611c9af1f6e","name":"debug_func","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":850,"y":420,"wires":[]}]

The required function...

  • when i input "cell_max 3.2" (over 50% charge) and "cell_min 3.1" so msg.payload "cell_max".
  • when i input "cell_max 3.1" (under 50% charge) and "cell_min 3.0" so msg.payload "cell_min".
    ... i dont see any payload in "debug_func" now.

Thank you very much in advance for your help.

2

In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)

``` 
   code goes here 
```

You can edit and correct your post by clicking the pencil :pencil2: icon.

See this post for more details - How to share code or flow json

3

Since messages arriving in your function "function" always have msg.topic set to either "cell_min" or "cell_max", the code in your second and third else if blocks is never executed.

var outputMsg = 0;
var batt_cell_max = 0;
var batt_cell_min = 0;

if (msg.topic == "cell_max") {   // "EITHER cell_max
   batt_cell_max = { payload: msg.payload, topic: "my_topic_cell_max" };
}
else if (msg.topic == "cell_min")  // OR cell_min
{
   batt_cell_min = { payload: msg.payload, topic: "my_topic_cell_min" };
}
else if (batt_cell_max > 50)   // NEVER
{
   outputMsg = batt_cell_max;
   return outputMsg;
}
else if (batt_cell_max <= 50)  //NEVER
{
   outputMsg = batt_cell_min;
   return outputMsg;
}

ps Maybe you can explain what this function node is supposed to do? I'm afraid it makes no sense to me.

4

i updated but still not working.

The required function.

  • when i input "cell_max 3.2" (over 50% charge) and "cell_min 3.1" so output msg.payload "cell_max".
  • when i input "cell_max 3.1" (under 50% charge) and "cell_min 3.0" so output msg.payload "cell_min".
    ... i see only "cell_min" in "debug_func" now.

Thank you very much in advance for your help.

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3.45","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_min","payload":"3.45","payloadType":"jsonata","x":150,"y":560,"wires":[["14d6e162ec373377"]]},{"id":"5e1409f01ce0c8c6","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 2.9","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"2.9","payloadType":"jsonata","x":150,"y":80,"wires":[["3bd2e60daacc5d57"]]},{"id":"c61fdb92442da94e","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.0","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.0","payloadType":"jsonata","x":150,"y":120,"wires":[["3bd2e60daacc5d57"]]},{"id":"ee99d849ae07ce95","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.1","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.1","payloadType":"jsonata","x":150,"y":160,"wires":[["3bd2e60daacc5d57"]]},{"id":"92d111892f16f6f7","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.2","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.2","payloadType":"jsonata","x":150,"y":200,"wires":[["3bd2e60daacc5d57"]]},{"id":"01d819e4d42e154d","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.3","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.3","payloadType":"jsonata","x":150,"y":240,"wires":[["3bd2e60daacc5d57"]]},{"id":"7f70490197626bd9","type":"inject","z":"229f5611c9af1f6e","name":"cell_max 3.45","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.45","payloadType":"jsonata","x":150,"y":280,"wires":[["3bd2e60daacc5d57"]]},{"id":"3bd2e60daacc5d57","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":280,"wires":[["09c1dc6daf0ae65a"]]},{"id":"14d6e162ec373377","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":560,"wires":[["d65e3c691b372797"]]},{"id":"09c1dc6daf0ae65a","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":340,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"d65e3c691b372797","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":500,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"8f99cbd4688ccde4","type":"debug","z":"229f5611c9af1f6e","name":"debug_percentage","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":450,"y":420,"wires":[]},{"id":"6b139a7965a247e0","type":"function","z":"229f5611c9af1f6e","name":"function","func":"var outputMsg = 0;\nvar batt_cell_max = 0;\nvar batt_cell_min = 0;\n\nif (msg.topic == \"cell_max\") {\n batt_cell_max = { payload: msg.payload, topic: \"my_topic_cell_max\" };\n }\n else if (msg.topic == \"cell_min\")\n {\n batt_cell_min = { payload: msg.payload, topic: \"my_topic_cell_min\" };\n }\n \nif (batt_cell_max > 50)\n {\n outputMsg = batt_cell_max;\n return outputMsg;\n }\n else if (batt_cell_max <= 50)\n {\n outputMsg = batt_cell_min;\n return outputMsg;\n }\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":700,"y":420,"wires":[["367a2b647ceb7d46"]]},{"id":"367a2b647ceb7d46","type":"debug","z":"229f5611c9af1f6e","name":"debug_func","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":850,"y":420,"wires":[]}]
5

I am only able to look at your code on my phone just now so I can't be sure but I think you are setting a variable eg batt_cellmin to be an object, then testing batt_cellmin >50.

You can't get a coherent response to such a comparison.

I advise you to use simple numeric or string variables. Only create an object with payload and topic immediately before the return statement.

I'll take another look when I get back home

6

image

OTHER NOTES:

  • you never use batt_cell_min (and never return it)
  • It is bad practice (node-red speaking) to generate new objects - it is always preferred to simply update and return the original msg
  • try to use const and let instead of var (I will let you search the new for "why")

What are you actually trying to achieve?

7

A common trap for beginners is expecting a function node to know about a previous message while dealing with a new one.
I'm not sure if that's what you are trying to do here.
You have to save the previous message using "context storage".

8

Hi all,
Thank you all so much for pointing me in the right direction.
Now everything is working perfectly.
Exactly as I wanted :slight_smile:

let outputMsg;
let batt_cell_min;
let batt_cell_max;
let batt_limit = 50.00;
let mem_batt_cell_min;
let mem_batt_cell_max;

if (msg.topic == "cell_min") {
   batt_cell_min = msg.payload;
   context.set("context_batt_cell_min", batt_cell_min); // to store a variable
};

if (msg.topic == "cell_max") {
   batt_cell_max = msg.payload;
   context.set("context_batt_cell_max", batt_cell_max); // to store a variable
};

mem_batt_cell_min = context.get("context_batt_cell_min"); //to retrieve a variable
mem_batt_cell_max = context.get("context_batt_cell_max"); //to retrieve a variable

if (Number(mem_batt_cell_max) < batt_limit) {
   return outputMsg = { payload: Number(mem_batt_cell_min), topic: "my_new_topic_batt_cell_min" };
}
else if (Number(mem_batt_cell_max) >= batt_limit) {
   return outputMsg = { payload: Number(mem_batt_cell_max), topic: "my_new_topic_batt_cell_max" };
}
else {
   return outputMsg = null;
};

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3.45","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cell_max","payload":"3.45","payloadType":"jsonata","x":150,"y":280,"wires":[["3bd2e60daacc5d57"]]},{"id":"3bd2e60daacc5d57","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":280,"wires":[["09c1dc6daf0ae65a"]]},{"id":"14d6e162ec373377","type":"range","z":"229f5611c9af1f6e","minin":"2.900","maxin":"3.450","minout":"0","maxout":"100","action":"scale","round":false,"property":"payload","name":"2.9-3.45V to 0-100%","x":440,"y":560,"wires":[["d65e3c691b372797"]]},{"id":"09c1dc6daf0ae65a","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":340,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"d65e3c691b372797","type":"function","z":"229f5611c9af1f6e","name":"to 0.00","func":"//msg.payload = msg.payload[86].value\nmsg.payload = parseFloat(msg.payload.toFixed(2))\nreturn msg;\n\n//const result = msg.payload.find(e => e.itemID == 'payload')\n//if (result) { msg.payload = result.value }\n//msg.payload = parseFloat(msg.payload.toFixed(2))\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":500,"wires":[["8f99cbd4688ccde4","6b139a7965a247e0"]]},{"id":"8f99cbd4688ccde4","type":"debug","z":"229f5611c9af1f6e","name":"debug_percentage","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":450,"y":420,"wires":[]},{"id":"6b139a7965a247e0","type":"function","z":"229f5611c9af1f6e","name":"function","func":"let outputMsg;\nlet batt_cell_min;\nlet batt_cell_max;\nlet batt_limit = 50.00;\nlet mem_batt_cell_min;\nlet mem_batt_cell_max;\n\nif (msg.topic == \"cell_min\") {\n   batt_cell_min = msg.payload;\n   context.set(\"context_batt_cell_min\", batt_cell_min); // to store a variable\n};\n\nif (msg.topic == \"cell_max\") {\n   batt_cell_max = msg.payload;\n   context.set(\"context_batt_cell_max\", batt_cell_max); // to store a variable\n};\n\nmem_batt_cell_min = context.get(\"context_batt_cell_min\"); //to retrieve a variable\nmem_batt_cell_max = context.get(\"context_batt_cell_max\"); //to retrieve a variable\n\nif (Number(mem_batt_cell_max) < batt_limit) {\n   return outputMsg = { payload: Number(mem_batt_cell_min), topic: \"my_new_topic_batt_cell_min\" };\n}\nelse if (Number(mem_batt_cell_max) >= batt_limit) {\n   return outputMsg = { payload: Number(mem_batt_cell_max), topic: \"my_new_topic_batt_cell_max\" };\n}\nelse {\n   return outputMsg = null;\n};\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":700,"y":420,"wires":[["367a2b647ceb7d46"]]},{"id":"367a2b647ceb7d46","type":"debug","z":"229f5611c9af1f6e","name":"debug_func","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":850,"y":420,"wires":[]}]

Thanks again.

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