javascript - json data extraction in pebbleJS -


i stuck in json data extraction in pebble. 

var ui = require('ui'); var ajax = require('ajax');  var url="http://ws.audioscrobbler.com/2.0/?method=user.gettopartists&user=test&api_key=4a9f5581a9cdf20a699f540ac52a95c9&limit=10&format=json&callback=?"; var card = new ui.card({   title:'last.fm stat',   subtitle:'fetching...' }); card.show();  ajax({ url: url }, function(data){   var topartist=data.topartists[0].artist.name;   card.subtitle(topartist); });

here's error get:

[info] ocess_manager.c:368: heap usage app <lastfm sta: total size <48584b> used <6256b> still allocated <28b> [phone] pebble-app.js:?: (+) [card 1] : [card 1]  [phone] pebble-app.js:?: javascript error: typeerror: cannot read property '0' of undefined     @ pebble-js-app.js:123:32     @ pebble-js-app.js:871:17     @ req.onreadystatechange (lib/ajax.js:11

4:9)

evening mona,

  1. remove question mark @ url's end.

  2. remove card.show() instruction put it, , place after adding subtitle it.

  3. specify you're dealing json datatype.

and final code should this:

var ui = require('ui'); var ajax = require('ajax');  var url="http://ws.audioscrobbler.com/2.0/?method=user.gettopartists&user=test&api_key=4a9f5581a9cdf20a699f540ac52a95c9&limit=10&format=json&callback="; var card = new ui.card({     title:'last.fm stat',     subtitle:'fetching...' });  ajax({ url: url, type: 'json' }, function(data) {     var topartist = data.topartists.artist[0].name;     card.subtitle(topartist);     card.show(); });

it should run perfectly. :)

also, should add failure callback in ajax method:

ajax({object}, success, failure)

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