add item to an array of json objects

Question

I want to add a value to specific field of my array which is a json object. in other words i want to append to a json object which is a field of another array.

var cdata = new Array();
 for (i in json2) {
     for (j in json2[i]) {
         //here i get error:
         cdata[j].push({
             'x': json2[i].timestamp,
             'y': json2[i][j]
         });
     };
 };

but i get Uncaught TypeError: Cannot call method 'push' of undefined error.

thanks in advance

Where is json2 defined? Looks like some code is missing here. — Kelly J Andrews, Dec 23 '13 at 17:16
And *sigh* there's no [JSON](http://json.org) anywhere in this question. Those are just JavaScript objects. — T.J. Crowder, Dec 23 '13 at 17:17
I've removed the JSON tag since your question doesn't seem to be related to the JSON data format at all. — Álvaro González, Dec 23 '13 at 17:19

score 4 · Answer 1 · edited May 23 '17 at 11:50

4

You are calling push on an array element referred to by the index j as follows cdata[j]

You should call

cdata.push({
         'x': json2[i].timestamp,
         'y': json2[i][j]
     });

Additionally - thanks to commenter - looking at the way you are iterating through the array json2 it doesn't seem right. We could do with seeing json2 to fully answer this one.

The line:

json2[i].timestamp

Suggests json2 is an array of objects

However the line:

json2[i][j]

suggests json2 is a multi-dimensional array.

See this post: How can I create a two dimensional array in JavaScript?

HTH

edited May 23 '17 at 11:50

Community

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answered Dec 23 '13 at 17:16

Captain John

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This is part of it, but the whole series of code seems suspect. – Kelly J Andrews Dec 23 '13 at 17:18
I know the code is insufficient but just forget about those json2. i just want to push on an array element which is a json object, how could i do that? – max imax Dec 23 '13 at 18:36
Provided you have an array object which is the only object that supports push natively the use push as shown. – Captain John Dec 23 '13 at 19:31

add item to an array of json objects

1 Answers1