Question

Given the following:

var a = JSON.parse('{"fst":"data1","snd":{"ind2":"data2"}}');
var index = "fst";
var res = a[index]; //res = data1
var index2 = "????";
var res2 = a[index2]; //res = data2

what should I put on index2 so res2 equals data2?

I’m looking for a generic syntax that would let me grab an element at ANY level of the parsed json, just by modifying the index string.

(I’m looping through a list of elements from different places/levels of a json derived object to build a table)

Any help would be much appreciated

Answer 1

You need a function for that

function deepAccess( obj, str ) {
    var parts = str.split("."),
        cur = obj;
    for( var i = 0; i < parts.length; ++i ) {
        cur = cur[parts[i]];    
    }

    return cur;
}

var index = "fst";
deepAccess( a, index ); //"data1"
index = "snd.ind2";
deepAccess( a, index ); //"data2"