Can't access global array in JavaScript

Question

I have a global variable say :

var series,hours;
var loadData = function(){
series = [[]];
hours = [];
d3.json("data/radar.json", function(error, data) {

    data.QualitySummaryObject.forEach(function(d,i) {
        series[i] = d.extractPercentage;
        hours[i] = d.extractorName;
  });


});  
console.log(hours);
};

Now if I am trying to access this console.log its working fine, but.

var print = function(){
    console.log(hours); //here its not working no value in hours why ... ?
}

use `hours = []` instead of `var hours`. remove `var` from declaration and `hours` will become global — Pratik, Jan 28 '13 at 12:08

Gabriel Gartz · Answer 1 · 2013-01-28T12:28:11.510

2

Ensure that you hours is global:

window.hours = [];

Then anywhere you can log it:

console.log(window.hours);

Using directly var without declaration will avoid context problems.

edited Jan 28 '13 at 12:28

answered Jan 28 '13 at 12:21

Gabriel Gartz

2,840
22
24

score 0 · Answer 2 · answered Jan 28 '13 at 12:16

0

If you are running the above code in a function, the variable hours is not a global variable because you previously declared it with var.

If you want to declare a variable as a global variable, instead of this:

var hours = [];

Do this:

hours = [];

To declare a global variable, all you have to do is give it a name.

answered Jan 28 '13 at 12:16

starbeamrainbowlabs

5,692
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no i am not running in any function... var hours is declared outside of every function.... – Saurabh Sinha Jan 28 '13 at 12:18
@SaurabhSinha either way, you should not need to declare a global variable with `var` outside of all the functions. – starbeamrainbowlabs Jan 28 '13 at 12:19
@starbeamrainbowlabs: Why not? Even global variables can (and should) be declared. – Bergi Jan 28 '13 at 12:22
@Bergi Didn't know that! I thought that global variables in javascript were declared without `var`. – starbeamrainbowlabs Jan 28 '13 at 12:26
1

@starbeamrainbowlabs: It's just that everything without a `var` and no declaration is considered to be global. – Bergi Jan 28 '13 at 12:29

Can't access global array in JavaScript

2 Answers2