How to use variables in JavaScript dot syntax? (with JSON)?

Question

Right say I have a json file:
json = {"object1" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}],
"object2" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}],
"object3" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}]
}

The values are irrelevant, and an array:

arr = Array("object1", "object2", "object3")

How would I use the values in the array to select the corrosponding value in the JSON?

I tried json.arr[0].item1(etc...) as that'd be the only way I can think of doing it but it didn't work.

The object names are put into an array via a for loop on the json file.

Semper VI · Accepted Answer

You will first need to evaluate the arr[index] before this can be referenced via dot notation.

I believe this will work
var workingArray = json.eval(arr[0])[1].item1 (looking for array index 1 of array index 0 variable)

but you may need to first evaluate arr[index] using the eval function and set this as a variable then evaluate the JSON object variable you are looking for

Darnental · Answer

You're using the wrong syntax to access the JSON objects. The JSON object contains members, not an array. Rewrite the JSON so that the start and end brackets are square brackets instead.


json = ["object1" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}],
"object2" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}],
"object3" : [{"item1": "value1", "item2": "value1"}, {"item1": "value1", "item2": "value1"}]
]

Now you can use  - json[0].item1...

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How to use variables in JavaScript dot syntax? (with JSON)?

2 Answers