CODEWITHSUNDEEP
jqueryjsonobjectloops
Johnathan Au
Johnathan Au

Reputation: 5362

How do I iterate through this JSON object in jQuery?

I have a JSON object which is generated by PHP. It's an object with a set of dates. It has the timeStamp and then a formatted version of the date. How would I iterate through this in jQuery?

{
  "dates":[
    {
      "timeStamp": 1317596400,
      "formattedDate": "Mon 03 October 2011"
    },
    {
      "timeStamp": 1317682800,
      "formattedDate": "Tue 04 October 2011"
    },
    {
      "timeStamp": 1317855600,
      "formattedDate": "Thu 06 October 2011"
    }
  ]
}

I've tried:

for (var i in data) { 
  alert(data.dates[i].timeStamp); 
};

for (var i in data) { 
  alert(data[i].dates.timeStamp); 
};

and

for (var i in data) { 
  alert(data.dates.timeStamp[i]); 
};

Upvotes: 47

Views: 101115

Answers (4)

gion_13
gion_13

Reputation: 41533

Since you tagged your question as a jquery one, you should use $.each because it's jquery's iterator function: 

$.each(data.dates, function(index, element) {
    alert(element.timeStamp); 
});

If you want to stick to the for in syntax (which i see you've tried), a solution might be : 

for(var key in data.dates) {
     alert(data.dates[key].timeStamp); 
}

But beware that the for in syntax may do more than you think it does: it iterates over the properties inherited from the prototype too, so it might be usefull to make sure you iterate only on the object instance properties: 

for(var key in data.dates) {
    // if it's not something from the prototype
    if(data.dates.hasOwnProperty(key)) {
        alert(data.dates[key].timeStamp); 
    }
}

update
Another elegant way is to use the Object.keys method that returns an array containing all the keys in the targeted object to iterate over all the object's properties: 

for(var i=0, keys=Object.keys(data.dates), l=keys.length; i<l; i++) {
    alert(data.dates[i].timeStamp);
}

Upvotes: 91

Mohammed Irfan Tirupattur
Mohammed Irfan Tirupattur

Reputation: 1549

You can simply iterate through the json structure using jQuery each:

$.each(data, function(index, element) {
   alert(element.dates.timeStamp); 
});

Upvotes: 3

mfadel
mfadel

Reputation: 897

You use $.each().
It looks like this: 

$.each(data, function(n, elem) {
    // here you process your data to data loaded to lines               
});

Upvotes: 3

Mike Simmons
Mike Simmons

Reputation: 1298

jQuery.each() is probably the easiest way, check this out: http://api.jquery.com/jQuery.each/

eg 

$.each(dates, function(index, date) { alert(date.timeStamp); });

Upvotes: 0

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