how to select the fields from an json array/object having particular value in javascript?

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I am having an JOSN object {"Display":{"FIRST_NAME":"X","MID_NAME":"X","LAST_NAME":"X","LAST_CHANGED":"X","ADP_FILE":"NA","MARITAL":"NA","EXEMP":"NA"}}

I want only the fields having value "X" form above JSON object.

Posted 23-Apr-15 2:01am

vickyramsey

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Sergey Alexandrovich Kryukov 23-Apr-15 12:23pm

What exactly do you mean by "I want"? What have you tried so far?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-04-23T06:22:00

This "want only" in not a specification of what you need. What would it mean? Undefine part of the properties? Create a new JavaScript object (not string) with the same properties except those with the values other then "X"? You can do it. What?

Anyway, you can use:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON[^],
create a structure from JSON string: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse[^],
traverse any object in a loop: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for_each...in[^],
and this is how you can remove a property from an object: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete[^].

You can create a new object and create new properties in a loop;

JavaScript

var result = {};
// ...
result.LAST_NAME = "X"; //sic!

JavaScript objects (including arrays) are associative containers; you can add any property at any time, and the property lookup has time complexity of O(1):
http://en.wikipedia.org/wiki/Associative_array[^],
http://en.wikipedia.org/wiki/JavaScript#Dynamic[^];
see also: http://en.wikipedia.org/wiki/Big_O_notation[^],
http://en.wikipedia.org/wiki/Time_complexity[^].

—SA