create Json with dynamic index

Question

I'd like create json with this structure inside the cycle:

{ id_foto: 
   [ { firstName: 37, lastName: 'Doe' },
     { firstName: 'Anna', lastName: 'Smith' },
     { firstName: 'Peter', lastName: 'Jones' } ] }

I wish it were a variable id_foto

so that:

if (id_foto == n.foto_moderata) {
 // add new { firstName: 'Anna', lastName: 'Smith' }
 } else {
 // create new "node" like
{ id_foto(NEW INDEX): 
       [ { firstName: 37, lastName: 'Doe' },] }
}

The Final result like:

{ 10: 
   [ { firstName: 37, lastName: 'Doe' },
     { firstName: 'Anna', lastName: 'Smith' },
     { firstName: 'Peter', lastName: 'Jones' } ]
11: 
   [ { firstName: fff, lastName: 'fff' },
     { firstName: 'fff', lastName: 'fff' } ]
 }

Then take all user of 11 index

Can't do it directly in the object literal syntax. You need to create the object, then add the new property with the dynamic name after. If you don't know how to create a property name from a variable, just look at some of the hundreds of other questions on StackOverflow that have asked how. — , Aug 17 '13 at 16:47
i see this post http://stackoverflow.com/questions/4538269/adding-removing-items-from-json-data-with-jquery, but i'd like create many item — Barno, Aug 17 '13 at 17:41

score 0 · Answer 1 · answered Aug 17 '13 at 16:48

One way to achieve a sequential ids for your data is to create:-
1. a place to store the current value of your id,
2. a function to increment and return your serial

You could store the current id value in your data object like so:-

{ 
   seq : 11,
   10: 
   [ { firstName: 37, lastName: 'Doe' },
     { firstName: 'Anna', lastName: 'Smith' },
     { firstName: 'Peter', lastName: 'Jones' } ],
   11: 
   [ { firstName: fff, lastName: 'fff' },
     { firstName: 'fff', lastName: 'fff' } ]
}

and then use the following to increment & return next sequence id

function id_foto() {
   return ++your_object.seq;//get,increment and return incremented value
}

create Json with dynamic index

1 Answers1