How do I access JSON elements through javascript?

Question

The JSON file I have is following:

{
  "root": {
    "Quizsize": null,
    "{urn:abc.com/xmlns/mona/page}page": [
      {
        "@xid": "page1623",
        "@title": "Quiz Landing Page",
        "{urn:abc.com/xmlns/mona/page}comment": null,
        "{urn:abc.com/xmlns/mona/page}skills": null,
        "{urn:abc.com/xmlns/mona/page}info": {
          "{urn:abc.com/xmlns/mona/common}property": {
            "@name": "quiz_landing",
            "@value": "true"
          }
        }
      }
    ]
  }
}
}

I am loading this JSON file using :

var jsondata = eval("("+chapterRequest.responseText+")") ;
Root = jsondata.root

Now I want to access @xid which is "page1623 and @name which is "quiz_landing". I dont know how to do this,Please help.

Thanks

Could you clarify what you mean by 'access'? If you want to read property value, you have to loop through them, if you want a containing node, you have to loop through properties also and look for a matching value. — Arthur P
– Arthur P, Commented Jun 28, 2011 at 17:56

Arthur P · Accepted Answer · 2011-06-28 18:21:34Z

4

JSON.parse(x) is better than eval(x), for one. It is not supported natively by some browsers though. If you want to access @xid, "urn:abc.com/xmlns/mona/page}page" points to an array whose first element is an object.

So use Root["{urn:abc.com/xmlns/mona/page}page"][0]["@xid"]. Or mix bracket and dot notation. Your choice, really.

edited Jun 28, 2011 at 18:21

Arthur P

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answered Jun 28, 2011 at 17:52

Steve Wang

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3 Comments

Anshul Over a year ago

Now the Error is: jsondata.root is undefined, its not able to access the root property.

Anshul Over a year ago

Its working now,the problem was I was using some other JSON file that doesnot has root property..Thanks Steve

user367134 Over a year ago

@Steve Wang: THX for ur answer "JSON.parse(x) is better than eval(x)"

entonio · Accepted Answer · 2011-06-28 17:51:47Z

1

When the key isn't a valid identifier, you use object['key'] instead of object.key, so jsondata.root['{urn:abc.com/xmlns/mona/page}page'][0]['@xid'].

answered Jun 28, 2011 at 17:51

entonio

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