JavaScript - Join two JSON strings (nested array)

Question

I have two JSON strings that are constructed dynamically. The first one is created from an XML Document:

if (window.DOMParser) {
        parser = new DOMParser();
        xmlDoc = parser.parseFromString(xml_string, "text/xml");
    } else// Internet Explorer
    {
        xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
        xmlDoc.async = false;
        xmlDoc.loadXML(xml_string);
    }
var json_str = xml2json(xmlDoc,"")

The other one created on the spot from user input.

Both have the same structure. The first one is:

{"Movies": { "Movie": [{"Title":"Movie1","Year":"2013"}]}};

and the second one is:

{"Movies": { "Movie": [{"Title":"Movie2","Year":"2014"}]}};

How can I concatenate these two so the result is two 'Movie' inside a "Movies": The result should be:

{"Movies": { "Movie": [{"Title":"Movie1","Year":"2013"},{"Title":"Movie2","Year":"2014"}]}};

I know that one method is to push {"Title":"Movie2","Year":"2014"} into ["Movies"]["Movie"] ... but is there any other way?

Possible duplicate of: stackoverflow.com/questions/10384845/… — Miguel Jiménez
– Miguel Jiménez, Commented Jan 28, 2014 at 21:35
You could use Underscorejs's pluck function (underscorejs.org/#pluck) to pluck out all title's. — xspydr
– xspydr, Commented Jan 28, 2014 at 21:37

Carl · Accepted Answer · 2014-01-28 21:47:56Z

0

Something like the concat method?

var a = {"Movies": { "Movie": [{"Title":"Movie1","Year":"2013"}]}};
var b = {"Movies": { "Movie": [{"Title":"Movie2","Year":"2014"}]}};

var c = {"Movies": { "Movie": a.Movies.Movie.concat(b.Movies.Movie) }};
console.log(c);

answered Jan 28, 2014 at 21:47

Carl

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Ben Smith Over a year ago

Damn. Beat me to it ;) Here's a jsfiddle which looks awfully similar to the answer above jsfiddle.net/Fresh/ZLHQF

Ali.B · Accepted Answer · 2014-01-29 17:11:25Z

0

So this is how I achieved what I wanted ... I guess the concat method would work too:

json_obj = JSON.parse(sessionStorage.getItem('object')); //->Creating JSON object from string format

var new_item = {"Vendor":'GUY', "Title": '...', "Year":'...'};

json_obj["Movies"]["Movie"].push(new_item);

JSON.stringify(json_obj) //-> String format

answered Jan 29, 2014 at 17:11

Ali.B

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