JavaScript global variable definition inside a function

Question

I have a global variable a and I am using it inside a function and assigning a value to it. When I use this variable outside the function it gives me undefined.

Eg.:

var a;
function my_func(){
  a=5;
}
console.log(a); //outputs undefined, how do I get the value 5 here

Why do I get undefined instead of 5?

It dint resolve my issue.

var id;

function set_id(myid){
 id=myid;
}

function get_id(){
 return id;
}

$("#btn").click(function(){
 $.post("....", function(data){ //data reurns a JSON
  set_id(id); //success!!
 }
}

$("#show").click(function()[
 console.log(get_id()); //doesn't work, how do I get this workin.. Where am I going wrong
}

before consoling the variable, you need to call the function, my_func(); untill then var a will be undefined. — Shreedhar
– Shreedhar, Commented Jul 27, 2012 at 18:46

mgraph · Accepted Answer · 2012-07-27 18:43:59Z

3

you should call the function my_func before log:

var a;
function my_func(){
  a=5;
}
my_func();      //<-- here
console.log(a);

answered Jul 27, 2012 at 18:43

mgraph

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Comments

Kendell · Accepted Answer · 2012-07-27 19:08:18Z

0

var a;

function my_function1() {
    return 5;
}

function my_function2() {
    a = 5;
}

/* Either of these options below will work to change the value of "a" to 5*/

// a = my_function1()
// my_function2()

answered Jul 27, 2012 at 19:08

Kendell

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