JSF: parse JSON and add new Item

I have to retrieve the content in data-birf-extra in the following script:

<a href="" data-birf-log="component" data-birf-par="mdot_v_lstg_1" data-birf-extra="{'c':'569710','v':'282188481','pg':'mdot_mya_qsc'}" data-birf-cmp="mdot_delt_car">

In javascript, I used:

  //get all listings in an arrayvar savedListings=$('[id$=savedListingsPanel]').find(".savelisting-button .savelisting-trigger.favorite");

Since, there are multiple dom elements found by the above selector, so

 //fire bi for each        $.each(savedListings,function(index,listing){            var par=$(listing).attr('data-birf-par');            var extra=$(listing).attr('data-birf-extra');            var jsonExtra=JSON.parse(extra.replace(/'/g, '"'));             jsonExtra['cmp']="mdot_my_dtc";            jsonExtra['et']="click";            if ($(listing).attr("data-birf-par")) {                jsonExtra['par']=par;                window.BIRF.log(jsonExtra,'event');            } else {                window.BIRF.log(jsonExtra, 'event');            }        });

The following are the issues I had:

1. JSON.parse(extra) not work, it complains "Uncaught SyntaxError: Unexpected token ' in JSON at position 1(…). "

    reason: extra contains single quotation which is not a valid character when use JSON.parse()-----> need to verfiy?

   solution: replace all single quotation with double quotation using .replace(regex, value)

  var jsonExtra=JSON.parse(extra.replace(/'/g, '"')); 

 

   JSON.stringify(...); // convert json object into a string by adding double quotations

  JSON.parse(...); // convert string to a json object by removing double quotations

2. Add new filed to json object:

   jsonExtra['cmp']="mdot_my_dtc";   jsonExtra['et']="click";

3. fire birf:

  window.BIRF.log(jsonExtra,'event');   //fire bi_event     window.BIRF.log(jsonExtra,'subpage'); //fire bi_page

                                             
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