Json key unable to access key value

Question

I will be getting a dynamic json as response, so I am using the below to get the key names and I always want the third key value which will either be true or false. So i get the third key's value using the below which is stored inside the theTypeIs and when I try to access the json I get undefined

example Json

submitResult = [{
        ComodityID: 33,
        ComodityName: 'LED',
        field1: true
    }, {
        ComodityID: 342,
        ComodityName: 'Installing ',
        field1: true
    }, {
        ComodityID: 322,
        ComodityName: ' Bracket',
        field1: true
    }
]

To find the third key name in the dynamic json:

var theTypeIs = Object.keys(submitResult[i])[2];
console.log(submitResult[i].theTypeIs)

I get undefined when i console log it. Can someone help me on this. Thank you in advance.

By the way, you should note that `Object.keys` doesn't guarantee the order. So you may get unexpected results. Check https://stackoverflow.com/q/30076219 for more info. — Victor, Dec 13 '18 at 19:49

score 2 · Accepted Answer · answered Dec 13 '18 at 19:36

2

console.log(submitResult[i].theTypeIs) prints undefinedbecause there is no property theTypeIs of submitResult[i]

You need to use the bracket notation when accessing an attribute by a variable

console.log(submitResult[i][theTypeIs])

answered Dec 13 '18 at 19:36

simon.ro

2,984
2
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score 0 · Answer 2 · answered Dec 13 '18 at 19:36

0

You should use the bracket notation:

console.log(submitResult[i][theTypeIs]);

answered Dec 13 '18 at 19:36

Victor

5,493
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score -1 · Answer 3 · answered Dec 13 '18 at 19:33

-1

enter code

const submitResult= [{ ComodityID: 33, ComodityName: 'LED', field1: true }, { ComodityID: 342, ComodityName: 'Installing ', field1: true }, { ComodityID: 322, ComodityName: ' Bracket', field1: true }]


//To get the third key which is field1

you can run a loop i to length
const {field1} = submitResult[i];

answered Dec 13 '18 at 19:33

Praveen Kumar Verma

7
1

That code snippet doesn't run correctly. Please fix it, and also add text to describe why it answers the question. – Ken Y-N Dec 14 '18 at 04:25

Json key unable to access key value

3 Answers3