How to read data from an Array contained in an object (Nested object data (objects))

How to read data from an Array contained in an object (Nested object data (objects))

ElnathElnath Posts: 2Questions: 1Answers: 0

I have implemented a table fed with JSON data.
The data structure is nested as in the example described on the page:

Write a procedure that retrieves data from the onclick event in a table row
data = table.row(this).data()

I retrieve data from objects without any problems. For example:

let start_date = data["hr"]["start_date"]

I have a problem getting data from Arrays objects. I tried different syntaxes, e.g.:

let contact_city = data["contact"][0]

where 0 means the first object in the array.

The console returns an error: Uncaught TypeError: Cannot read properties of undefined (reading '0')

I am sending some of the data returned from data = table.row(this).data()

Please help

This question has an accepted answers - jump to answer


  • kthorngrenkthorngren Posts: 20,258Questions: 26Answers: 4,763
    Answer ✓

    I built a test case based on the example you linked to. Using let contact_city = data["contact"][0] should work. The test case shows four ways to access the nested array:

    If this doesn't help please provide a link to your page or a test case replicating the issue you are having.


  • ElnathElnath Posts: 2Questions: 1Answers: 0

    Good morning,

    thank you for your reply and indicating the solution
    I tested referencing the data source (JSON). Retrieving the values of individual fields works correctly.
    I removed the old code and wrote it from scratch. Now it works properly.

    I made a reference to data - data["contact"][0] - from another function. I suspect I was passing a string instead of a numeric value. I'll check it out next time I get a chance.

    Thank you for your help. I will use more often.

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