Creating a text array

[David Dempster]

Hi to the Node-Red Group

Is it possible to create a text array and save it in a global variable using global.set (  ) ?

Any help/advice would be appreciated.

Cheers from David

[Mark Setrem]

Yes

[{"id":"d7717e9.624828","type":"tab","label":"Flow 1"},{"id":"54b3d2ce.6a0bac","type":"inject","z":"d7717e9.624828","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":112.5,"y":173,"wires":[["8c734d56.a1a988"]]},{"id":"8c734d56.a1a988","type":"function","z":"d7717e9.624828","name":"","func":"var cars = [\"Saab\", \"Volvo\", \"BMW\"];\nglobal.set(\"foo\",cars);  // this is now available to other nodes\nreturn msg;","outputs":1,"noerr":0,"x":257.5,"y":174,"wires":[[]]},{"id":"2681bcbc.79074c","type":"inject","z":"d7717e9.624828","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":103.5,"y":230,"wires":[["c32e04ba.57274"]]},{"id":"c32e04ba.57274","type":"change","z":"d7717e9.624828","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"foo","tot":"global"}],"action":"","property":"","from":"","to":"","reg":false,"x":273.5,"y":229,"wires":[["e5865a82.625f2"]]},{"id":"e5865a82.625f2","type":"debug","z":"d7717e9.624828","name":"","active":true,"console":"false","complete":"false","x":459.5,"y":229,"wires":[]}]

[David Dempster]

Hi Mark

Thanks for your swift response - I'll give it a try.

Cheers from David

[Mark Setrem]

No problem in the example the first line creates an array and stores it in a global variable, the second line retrieves sets msg.payload to be the global variable contents

[David Dempster]

Hi Mark,

Just tried it - works a treat.

I was being so complicated with my syntax.

Once I saw your code it made perfect sense.

Thanks again for your help.

David

[David Dempster]

Hi Mark,
Do you know the answer to this?
I'm trying to extract a specific element of a text array.

If I use the numerical 2 (as below), I can get the third element of the text array, but if I use index (which is set to 2) I get an error message.

var index = 2;

var prefix = global.get("instance.2");
msg.payload = prefix;
return msg;

[David Dempster]

This syntax fails with "unexpected c at position 9.
Any suggestions what I'm doing wrong?

var count = 3;
var test = global.get("instance[count]");
msg.payload = test;
return msg;

[Nick O'Leary]

"instance[count]" is a literal string. The fact you have a variable called count doesn't have any bearing on that string.

You need to build the string:

var count = 3;
var test = global.get("instance["+count+"]");

msg.payload = test;
return msg;

Or, do it in two steps - get the compete array and then extract the individual element:

var count = 3;
var data = global.get("instance");
msg.payload = data[count];
return msg;

Nick

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[David Dempster]

Thanks Nick for your swift response.

Cheers from David.