Can not retrieve value from JSON array

Question

I get the data from server every 10 seconds as

var data = { response: {}, calls: 0 };
    var poller = function() {
        $http.get('http://localhost:8080/monitoring/rest/graph/temperature').then(function(r){
            data.response = r.data;
            console.log(r.data);
            extractTemperatureReadings(r.data)
            data.calls++;
            $timeout(poller, 10000)
        });
    }
    poller();

and then I want to extract certain values which I do as

function extractTemperatureReadings(apiResponse) {
    var readings = {}
    readings['reading'] = apiResponse.map(function(value){value.reading})
    readings['dateTime'] = apiResponse.map(function(value){value.dateTime})

    console.log('Temperature reading: ' + JSON.stringify(readings))
    return readings
}

However on Browser console.log, I see

[Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object]
monitoring.js:64 Temperature reading: {"reading":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"dateTime":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null]}

where each Object when I click, I get

0: Object
dateTime: "2015-08-31 19:56:28.335000"
moduleId: "110010 "
reading: "400"
__proto__: Object

What is wrong with my code?

tymeJV · Accepted Answer · 2015-09-01 20:31:07Z

3

You never return from your .map calls

readings['reading'] = apiResponse.map(function(value){ return value.reading })
readings['dateTime'] = apiResponse.map(function(value){ return value.dateTime })

Also, you don't have to stringify your object to see it in the console with preceding text, simply do:

console.log('Temperature reading: ', readings)

answered Sep 1, 2015 at 20:31

tymeJV

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1 Comment

daydreamer Over a year ago

I am still in my Scala senses :(. Thanks @tymeJV

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