Uncaught TypeError

[veysel]

Hello,

var j;
 for (j= 1; j <=limit; j=j+1) 
  {
var value1 = str1.concat(obj.sky[0].satellites[j].PRN); 
  }

i do this and it is working in web page but if i do inspect element it says :

Uncaught TypeError: Cannot read property 'PRN' of undefined
    at Object.success ((index):444)
    at i (VM16347 jquery-3.2.1.min.js:2)
    at Object.fireWith [as resolveWith] (VM16347 jquery-3.2.1.min.js:2)
    at A (VM16347 jquery-3.2.1.min.js:4)
    at XMLHttpRequest.<anonymous> (VM16347 jquery-3.2.1.min.js:4)

i am not good at js can anyone tell me what is my fault ?

 

Edited February 5, 2020 by veysel

[Barand]

I'd guess that satellite[j] does not exist for the current value of j. You need more satellites

It's better to use foreach() when iterating through arrays instead of for() (which expects a satellite to always be present for every value of j)

[veysel]

Hello First of all thank you so much 

before i ask question, i have this line:

var limit=obj.sky[0].satellites.length;

if (limit>10)  
{
 limit=10
}

i  want to monitoring max 10 values but it can be less. i solved it with your help. Here what i do

 for (j= 1; j <=limit-1; j=j+1) 
 {
var value1 = str1.concat(obj.sky[0].satellites[j].PRN); 
 }

Because obj.sky[0].satellites[j] does not contain obj.sky[0].satellites[0].PRN that's why as you said, satellite[j] does not exist for the current value of j

 

Edited February 5, 2020 by veysel