Javascript returns only keys but not values

Question

The following is the data from the source file:

 {
 "dubbuseqchapter+block@a7a5931f68d0482eaff2b7c9f9684e47": {
    "category": "chapter", 
    "children": [
      "dubbuseqsequential+block@968513c8f0cc4249b7cfc2290ac967dc", 
      "dubbuseqsequential+block@f7f730a478144a74bd127f996d6dc4f5", 
      "dubbuseqsequential+block@91a0d5d7cd9649a3bdf057400e0a1c96", 
      "dubbuseqsequential+block@28b2b171b6734b13af29735796c5ad5a", 
      "dubbuseqsequential+block@192a150c8aab43b9bd236773ba60b414", 
      "dubbuseqsequential+block@26b3464dad42460ea66f9afe89770065"
    ], 
    "metadata": {
      "display_name": "Introduction course orientation"
    }
  }, 


  "dubbuseqchapter+block@b2451e9195c5466db8b66f53ed06c9fd": {
    "category": "chapter", 
    "children": [
      "dubbuseqsequential+block@c95826a16f71405ba58319d23d250fc4", 
      "dubbuseqsequential+block@fe4e3b8b7cdd4fa0b9fe9090223b7125", 
      "dubbuseqsequential+block@44bbdee625dc465ebe725d2126ed0662", 
      "dubbuseqsequential+block@8d4daba07d4443f3b2a0b2506280ee2c", 
      "dubbuseqsequential+block@c68d9d3ba7de45b1b0770085e4f1f286", 
      "dubbuseqsequential+block@ccdca5b2aca94dbdabb3a57a75adf3fa"
    ], 
    "metadata": {
      "display_name": "Module closing section"
    }
    }
    }

The following javascript brings the top key values (i.e dubbuseqchapter+block@a7a5931f68d0482eaff2b7c9f9684e47,dubbuseqchapter+block@b2451e9195c5466db8b66f53ed06c9fd )

Javascript code

    var obj = JSON.parse(jContent);
        var keys = Object.keys(obj);


    for (var i = 0; i < keys.length; i++) {
        var row = createRowCopy(getOutputRowMeta().size());
        var idx = getInputRowMeta().size();


            row[idx++] = keys[i];

        //  Alert (keys.length);

            putRow(row);
        }

However, I am unable to get the values of the keys..(i.e. Category, Children and metadata) in this example.

I have tried Objects.values() but it returns null or object object in the Alert.

Quentin · Accepted Answer · 2016-05-03 15:24:14Z

5

keys is an array of strings, each string being a property name.

You get the value for a property name in the usual way:

object[property_name]

i.e.

var value = obj[keys[i]];

answered May 3, 2016 at 15:24

Quentin

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5 Comments

Dubbu Over a year ago

Thank you for your quick reply. I really appreciate that. But all I got in the Alert box is Object Object...thats it...

Quentin Over a year ago

@Dubbu — That's because it (the value) is an object and you've implicitly called toString() on it. What did you expect?

Dubbu Over a year ago

Hi Quentin, I dont know much about Javascript. I have picked up the code written by someone and managing to get things work. All I want is from the above json source is along with the Keys which it is populating, I need the values (Category, Children and Metadata). Would that be possible? Thanks

Quentin Over a year ago

Those aren't values. Those are properties of the object (which is the value of the respective property of the parent object). You access them like any other property.

Dubbu Over a year ago

var obj = JSON.parse(jContent); var keys = Object.keys(obj); for (var i = 0; i < keys.length; i++) { var row = createRowCopy(getOutputRowMeta().size()); var idx = getInputRowMeta().size(); row[idx++] = keys[i]; var value = obj[keys[i]]; Alert (value); putRow(row); } Sorry, if I didnt understand...Thanks for your guidance...Still am getting Object Object as a value

kevin ternet · Accepted Answer · 2016-05-03 17:08:03Z

0

this code shows how to navigate into parsed JsonData

var obj = JSON.parse(textJson);
var keys = Object.keys(obj);
console.log(obj[keys[0]].metadata.display_name);

this will print : Introduction course orientation

answered May 3, 2016 at 17:08

kevin ternet

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1 Comment

Dubbu Over a year ago

Hi Kevin, Thanks for your valuable tip. It works fine if I give Alert but I am unable to retrieve the Category, Children and Metada (all the 3 child elements). I am using the following code for the total output. var obj = JSON.parse(jContent); var keys = Object.keys(obj); for (var i = 0; i < keys.length; i++) { var row = createRowCopy(getOutputRowMeta().size()); var idx = getInputRowMeta().size(); row[idx++] = keys[i]; row[idx++] = obj[keys[i]].category; putRow(row); } I could bring upto category but not after that. Please help if poss.Thx

kevin ternet · Accepted Answer · 2016-05-05 22:08:16Z

0

Or even this way to retrieve your subProperties

var obj = JSON.parse(textJson);
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++){
  console.log(keys[i]);
  var subKeys = Object.keys(obj[keys[i]]);
  for (var j = 0; j < subKeys.length; j++) console.log(subKeys[j] + " --> " + obj[keys[i]][subKeys[j]]);
}

answered May 5, 2016 at 22:08

kevin ternet

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