Since JS doesn't handle 19 significant digits in Number(), you'd have to
load the Id as a String():
var data = '{"Id":"2688517729247252699",...
If you are just using the Id as an identifier, you probably don't need
to perform arithmetic on it.
If you do need to perform addition and subtraction on 19-digit numbers,
I suggest that you create a new Class for your long integers, which
would have two properties: the bottom half and the top half, both stored
as Number()s. You'll need a parseLongInteger() function to convert your
string to a LongInteger(); a LongInteger.toString() function to convert
back to String(); and .add() and .subtract() methods that add/subtract
the parts then perform any "carry" operations from one part to the
other.
If you need to multiply 19-digit numbers, you'd need to split them into
more than 2 parts.
I can't seem to find any good libraries for really long Javascript
integer arithmetic. Such libraries abound in other languages, using
String()s to hold the numbers, and performing character-by-character
arithmetic. There's a page with JS addition of long numbers here:
http://www.trans4mind.com/personal_development/JavaScript/longnumAdd.htm
--
Mike Williams
http://econym.org.uk/gmap
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