how to update the attribute value of json in javascript

Question

I have a json file that looks like this:

{
 "@id": "2",
 "@samsid": "d7058536c89b46c0b58117eff64372f7",
 "@productname": "Another paid for",
 "@downloaddate": "2013-05-28 11:37:12Z",
 "@downloadlocation":
    "2AFoGZVJpFHzspQD9UoE2C4VFYc8idiO4ebaRx4uEvtG+79DjkOUjJQjp9lJdSk54KIbFqzr",
 "@upgradeavailable": "2wECEpVJpFHS",
 "@downlaodstatus": "3QGf15VJpFFrUzr6oxwoew=="
}

I want to update the value of the attribute @id eg (@id:2 To @id:4).

How would I do this?

@vipinkatiyar You mean you have a .json file you want to update? Then your question is not a javascript problem! You'll have to use another language, most probably your backend server language. Anyway I updated my answer for this. — gideon
– gideon, Commented May 28, 2013 at 6:27

gideon · Accepted Answer · 2013-05-28 06:30:15Z

3

Update : Since you now mentioned you want to sore this into a file! You could still set the json into a variable like below, then set it's value. Then use JSON.stringify() to convert it into a string and then write it into your file on the backend. This would really depend on how your system is designed.

I'm not sure why but since you have @ in the keys for your JSON object you will have to get and set them like this:

//assign into a variable
var x = {
"@id": "2",
"@samsid": "d7058536c89b46c0b58117eff64372f7",
"@productname": "Another paid for",
"@downloaddate": "2013-05-28 11:37:12Z",
"@downloadlocation":
   "2AFoGZVJpFHzspQD9UoE2C4VFYc8idiO4ebaRx4uEvtG+79DjkOUjJQjp9lJdSk54KIbFqzr",
"@upgradeavailable": "2wECEpVJpFHS",
"@downlaodstatus": "3QGf15VJpFFrUzr6oxwoew=="
};
alert(x["@id"]); //shows 2
x["@id"] = 4
alert(x["@id"]);//shows 4

See a working fiddle : http://jsfiddle.net/jPa6n/

edited May 28, 2013 at 6:30

answered May 28, 2013 at 6:25

gideon

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i100 · Accepted Answer · 2013-05-28 06:44:41Z

0

if you use javascript and some libraries try something like this (I use jQuery as it is popular)

var a = JSON.parse('{"@id": "2","@samsid": "d7058536c89b46c0b58117eff64372f7","@productname": "Another paid for","@downloaddate": "2013-05-28 11:37:12Z","@downloadlocation": "2AFoGZVJpFHzspQD9UoE2C4VFYc8idiO4ebaRx4uEvtG+79DjkOUjJQjp9lJdSk54KIbFqzr","@upgradeavailable": "2wECEpVJpFHS","@downlaodstatus": "3QGf15VJpFFrUzr6oxwoew=="}');
a['@id'] = 4;
var b = JSON.stringify(a);

answered May 28, 2013 at 6:44

i100

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