Push in msg.payload

Folgore

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Apr 8, 2018, 5:28:44 PM4/8/18

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Hi, I have a msg.payload[object], I want to push another object but receive the error. How should i do?

Thank's

Nick O'Leary

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Apr 8, 2018, 5:39:18 PM4/8/18

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Hi,

It is not entirely clear what you mean with the question.

If you are hitting an error, please share the actual error message and any relevant code you are using.

Nick

On Sun, 8 Apr 2018, 22:28 Folgore, <dario....@gmail.com> wrote:

Hi, I have a msg.payload[object], I want to push another object but receive the error. How should i do?

Thank's

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Folgore

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Apr 9, 2018, 1:32:30 AM4/9/18

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Sorry, I have this code in a function:

///////////////////////////////////////////////////////

var ex=global.get("ex");

var id=global.get("index");

var msg2= [];

var msg3=[]

msg3[id].push({key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v});

msg.payload=msg3;

msg.topic="Sleep"+id;

if (id<10)

{

id=id+1;

global.set("index",id);

return msg;

}

///////////////////////////////////////////////////////

I have create a for loop externally, but in this case is not possible to set msg.payload.push(msg3[id]), return a error (push is not a function).

Thanks

Colin Law

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Apr 9, 2018, 2:07:04 AM4/9/18

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Firstly you have defined msg2 and 3 as empty arrays, messages must be objects not arrays. Secondly, push must be called on an array, but you are calling it on msg3[id] which does not exist and therefore is not an array.

Colin

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Folgore

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Apr 9, 2018, 2:28:51 AM4/9/18

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Yes, is an array of object, I want to add msg3 to msg.payload [object,object].

the result is similat to:

msg.payload={key:"Sonno1"+id,values:500}{key:"Sonno2"+id,values:650}.....excetera

You have a suggestion?

cflurin

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Apr 9, 2018, 3:55:35 AM4/9/18

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How to use the push() method, have a look here:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push

Colin Law

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Apr 9, 2018, 4:04:01 AM4/9/18

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On 9 April 2018 at 07:28, Folgore <dario....@gmail.com> wrote:
> Yes, is an array of object, I want to add msg3 to msg.payload
> [object,object].
>
> the result is similat to:
>
> msg.payload={key:"Sonno1"+id,values:500}{key:"Sonno2"+id,values:650}.....excetera

Do you mean msg.payload is already an array of objects and you want to get
msg.payload=[{key:"Sonno1"+id,values:500},{key:"Sonno2"+id,values:650}, ...]

If so then you should be pushing to msg.payload
msg.payload.push({key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}});

However that assumes the payload is coming in already as an array, if
not then you need to set it as an empty array first or just do
msg.payload = [{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}}]

I don't see how you are adding extra elements though, unless somehow
the message is being fed back in to the node with the accumulated
entries. I don't understand fully what you are trying to do but I
wonder if actually you should be saving the array in the node context
so you can add to it each time.

A couple of other points, don't use msg for a variable name unless it
is a message, that is just confusing. Also I suggest not using global
context unless you really need to. Use the node context if you can or
pass values in messages.

Colin

Folgore

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Apr 9, 2018, 4:20:11 AM4/9/18

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I publish the code

the comment to Type 2 is the code with problem

Il giorno domenica 8 aprile 2018 23:39:18 UTC+2, Nick O'Leary ha scritto:

Colin Law

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Apr 9, 2018, 4:33:15 AM4/9/18

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I am afraid that flow is just horribly wrong. If you did remove the
bug from the function node it is going to send its message, that will
go into the delay, it will go back into the function node, into the
delay etc and will go round and round for ever.

Colin

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Folgore

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Apr 9, 2018, 4:54:41 AM4/9/18

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Yes, I know but is only a test for watch the performance.

The message is stopped when id is 10. Is not for ever.

Folgore

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Apr 9, 2018, 4:59:14 AM4/9/18

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Hi, do you mean this?

msg3[id].push([{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}]);

msg.payload.push=msg3;

I'm returned this error:

"TypeError: Cannot read property 'push' of undefined"

Colin Law

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Apr 9, 2018, 5:03:37 AM4/9/18

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On 9 April 2018 at 09:59, Folgore <dario....@gmail.com> wrote:
> Hi, do you mean this?
>
> msg3[id].push([{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}]);

Is msg3[id] an array? If not then you cannot push to it. Push adds
another element to an existing array. In fact msg3 is an empty array
so msg3[id] does not exist. I think you might save both of us a lot
of time in the long run if you were to take a few hours out and work
through some primers in javascript, in particular using objects and
arrays.

Colin

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Folgore

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Apr 9, 2018, 5:32:59 AM4/9/18

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I waw wrong the syntax:

msg.payload.push(msg3);

However , I try to set a msg,payload with msg3 (msg3 is an array) for the first time

var ex=global.get("ex");

var id=global.get("index");

var msg3=[]

msg3[0].push([{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}]);

if (id==2)

{

msg.payload=msg3;

}

else

{

msg.payload.push(msg3[0]);

}

msg.topic="Sonno"+id;

if (id<10)

{

id=id+1;

global.set("index",id);

return msg;

}

Now I received this error.

"TypeError: Cannot read property 'push' of undefined"

Nick O'Leary

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Apr 9, 2018, 5:44:13 AM4/9/18

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Hi,

you still have the issue Colin highlighted in his first reply:

var msg3=[]

msg3[0].push([{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}]);

You are defining msg3 as an empty array - so msg3[0] does not exist - it is undefined.

To push something into the msg3 array, you should do:

msg3.push([{key:"Sonno"+id,values:ex.Sheets.sonno['E'+id].v}]);

Nick

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Folgore

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Apr 9, 2018, 11:15:03 AM4/9/18

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Ok, now I understand my error

Thank you very much

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