Javascript – Storing array of objects in hidden field

You can parse your array into a JSON-string to store it:

.push() is a function, therefore it needs () and not the [] array-syntax.

var elems = [];
elems.push('1');
elems.push('2');
elems.push('3');

$('#input_hidden_field').val(JSON.stringify(elems)); //store array

var value = $('#input_hidden_field').val(); //retrieve array
value = JSON.parse(value);

To create an object just change the definition of elems and the storage of the values:

var elems = {};
elems[0] = '1';
elems[1] = '2';
elems[2] = '3';

Demo

Reference

.stringify()

.parse()