global variable in javascript?

Question

i have this code:

    $(".link").each(function() {
            group += 1;
            text += 1;
            var links = [];
            links[group] = [];

            links[group][text] = $(this).val();
        }
    });

    var jsonLinks = $.toJSON(links);

after it has looped every .link it will exit the each loop and encode the array 'links' to json. but the array 'links' is a local variable inside the each-loop. how can i make it global outside the loop?

Answer 1

Define links outside the loop:

var links = [];
$(".link").each(function() {
  group += 1;
  text += 1;
  links[group] = [];
  links[group][text] = $(this).val();
});
var jsonLinks = $.toJSON(links);

I should also point out that this doesn't make a lot of sense because you will end up element 7, for example, being an array with a single element (indexed as 7) to the value. Is this really what you want?

What I imagine you want is an array of the values. If so, why not use map()?

var links = $(".link").map(function(i, val) {
  return $(val).val();
});

Answer 2

.

var links = [];

$(".link").each(function() {
        group += 1;
        text += 1;            
        links[group] = [];

        links[group][text] = $(this).val();
    }
});

var jsonLinks = $.toJSON(links);

Answer 3

Just declare it before your block of code:

var links = [];
$(".link").each(function() {
        group += 1;
        text += 1;
        links[group] = [];
        links[group][text] = $(this).val();
    }
});

var jsonLinks = $.toJSON(links);

or simply remove 'var':

$(".link").each(function() {
        group += 1;
        text += 1;
        links = [];
        links[group] = [];
        links[group][text] = $(this).val();
    }
});

var jsonLinks = $.toJSON(links);

Answer 4

Create a closure:

{    
    var links = [];
    $(".link").each(function() {
            group += 1;
            text += 1;

            links[group] = [];

            links[group][text] = $(this).val();
        }
    });

    var jsonLinks = $.toJSON(links);
}

Answer 5

To define a global variable, you can either

a) define the variable outside of a function (as already mentioned in other answers)

or

b) attache the variable to the window object

$(".link").each(function() {
            group += 1;
            text += 1;
            window.links = [];
            links[group] = [];

            links[group][text] = $(this).val();
        }
    });

    var jsonLinks = $.toJSON(links);

or

c) create a variable without the var keyword

$(".link").each(function() {
            group += 1;
            text += 1;
            links = [];
            links[group] = [];

            links[group][text] = $(this).val();
        }
    });

    var jsonLinks = $.toJSON(links);

Answer 6

JavaScript only understand two scopes

1. Global: Which is any variable outside the function and variables declare without the var

2. Function : Anything which is inside the function.

So i will suggest you the closure approach as follows

 function getJSONLinks()
 {
      var links = [];
      $(".link").each(function() {
        group += 1;
        text += 1;
        links[group] = [];
        links[group][text] = $(this).val();
       }
     });
     return $.toJSON(links);
 }