Xtykutl

I am trying to make two arrays by extracting data from a json array using Push & Shift method. The json file is updated with new data periodically. But I am not able to populate the arrays with all & updated data. It is always last index[11] being populated. Rest 0-11 are always zero.

How to correct it.

Here is my code:

 <script>

     var Device_Data;

     var rssi, batt;



    function dspChrt(Device_Data) { 

    console.log(Device_Data);



        var rssiArray = ;

        var battArray = ;

        var N = 12;

        for (i = 0; i < N; i++) {

            rssiArray.push(0);

            battArray.push(0); }



        //console.log(Device_Data[0].rssi);

        //console.log(Device_Data[1].battery_voltage_mv);

        rssi = Device_Data[0].rssi;

        batt = Device_Data[1].battery_voltage_mv;

        rssiArray.shift();

        rssiArray.push(rssi);

        battArray.shift();

        battArray.push(batt);



        console.log(rssiArray);

        console.log(battArray);



 </script>

Output of console.log(Device_Data);

288) […]

​[0…99]

​​0: {…}

​​​battery_voltage_mv: 131

​​​rssi: "-110"

​​​<prototype>: Object { … }

​​1: Object { rssi: "-134", battery_voltage_mv: 131 }

​​2: Object { rssi: "-125", battery_voltage_mv: 131 }

​​3: Object { rssi: "-132", battery_voltage_mv: 131 }

Output of console.log(rssiArray);

(12) […]

​0: 0

​1: 0

​2: 0

​3: 0

​4: 0

​5: 0

​6: 0

​7: 0

​8: 0

​9: 0

​10: 0

​11: "-110"

Output of console.log(battArray);

(12) […]

​0: 0

​1: 0

​2: 0

​3: 0

​4: 0

​5: 0

​6: 0

​7: 0

​8: 0

​9: 0

​10: 0

​11: 131

What your code those:

filling the arrays rssiArray and battArray with 12 zeros.

Then you are removing the first element with .shift().

Now you have 11 zeros in your arrays.

Then you are adding one element to each array.

So you will have two arrays with the first 11 elements as zeros, then you get one element on position 11 which comes from the Device_Data object.

if you want to add elements to the first position in your arrays then you can use:

rssiArray.unshift(rssi);

battArray.unshift(batt);

The dynamic values will be added as the first elements to the arrays.

But i guess you want to copy the whole structure from Device_Data to your arrays?
Then you can do something like this:

 <script>

    function dspChrt(Device_Data) { 

        console.log(Device_Data);



        var rssiArray = ;

        var battArray = ;

        for(var i=0; i<Device_Data.length; i++) {

            rssiArray.push(Device_Data[i].rssi);

            battArray.push(Device_Data[i].battery_voltage_mv);

        }



        console.log(rssiArray);

        console.log(battArray);

     }

 </script>