Parsing JSON in JSX: ReferenceError: Object.keys is not a function

[juliel96058674]

I'm getting a "ReferenceError: Object.keys is not a function" error when trying to parse JSON from a jsx file:

Inside my jsx file I have:

$.evalFile("../json2.js");

try

{

     var testDict = {"a": "1", "b": "2"};

     var keys = Object.keys(testDict);

catch (e) {

     alert("Caught error: " + e);

}

Does anyone have any idea why I'm getting this error when trying to parse the keys?

Thanks!

[DBarranca · Accepted solution]

Sure it can't work... Object.keys is an EcmaScript 5 feature, and ExtendScript is stuck at version 3 (that's the why you're importing json2.js – no native json support in this dry land). According to Mozilla, this polyfill will work:

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
if (!Object.keys) {
  Object.keys = (function () {
    'use strict';
    var hasOwnProperty = Object.prototype.hasOwnProperty,
        hasDontEnumBug = !({toString: null}).propertyIsEnumerable('toString'),
        dontEnums = [
          'toString',
          'toLocaleString',
          'valueOf',
          'hasOwnProperty',
          'isPrototypeOf',
          'propertyIsEnumerable',
          'constructor'
        ],
        dontEnumsLength = dontEnums.length;
    return function (obj) {
      if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) {
        throw new TypeError('Object.keys called on non-object');
      }
      var result = [], prop, i;
      for (prop in obj) {
        if (hasOwnProperty.call(obj, prop)) {
          result.push(prop);
        }
      }
      if (hasDontEnumBug) {
        for (i = 0; i < dontEnumsLength; i++) {
          if (hasOwnProperty.call(obj, dontEnums)) {
            result.push(dontEnums);
          }
        }
      }
      return result;
    };
  }());
}

Hope this helps,

Davide Barranca

www.davidebarranca.com

http://htmlpanelsbook.com

[juliel96058674]

Yes the polyfill works, thanks!