JSON convert to javascript array does not work

Question

With "data" being JSON, why does this script not work? I am using "$.parseJSON(data);" to convert the JSON to an array, and the last line of code is how I would typically access the resulting array.

{
    "refTopic": [
        {
            "REFTOPICABV": "Purpose",
            "REFTOPICVALUE": "Purpose and Need",
            "REFTOPICID": 65
        },
        {
            "REFTOPICABV": "Description",
            "REFTOPICVALUE": "Project Description",
            "REFTOPICID": 66
        }
    ]
}

if (refTopic == undefined) {
    getTopicsSelectBox(function(data) {
        console.log(typeof data);               //string
        var refTopic = $.parseJSON(data);
        console.log(typeof refTopic);           //object
        console.log(refTopic instanceof Array); //false

        console.log(refTopic[i].REFTOPICID);    //undefined
    });
}

Try refTopic['refTopic'][0]['REFTOPICID']

Kamehameha
– Kamehameha

2015-07-09 11:14:43 +00:00
Commented Jul 9, 2015 at 11:14 — Kamehameha
– Kamehameha, Commented Jul 9, 2015 at 11:14

Omri Aharon · Accepted Answer · 2015-07-09 11:16:25Z

2

You are missing one level of referencing, it should be:

refTopic.refTopic

This is because you wrote:

var refTopic = $.parseJSON(data);, so the variable is the entire object, not specifically refTopic inside it.

I'd just write like this to be more clear:

var refTopicObj = $.parseJSON(data);
console.log(typeof refTopicObj);           
console.log(refTopicObj.refTopic instanceof Array);    
console.log(refTopicObj.refTopic[i].REFTOPICID);

answered Jul 9, 2015 at 11:16

Omri Aharon

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