CODEWITHSUNDEEP
javascript
Sir
Sir

Reputation: 8280

Global variable not defined from onclick?

I have declared my array globally like so:

window.onload = function(){
   var test = 'test';
   var sel = new Array();
   login_check();
};

Everything pretty much is inherited from login_check() function in my engine. The problem is whilst var test is set var sel is not set when i use it in a function.

I use this in my function :

console.log(test); //displays as intended
if(sel.length > 0){  //ERROR Uncaught ReferenceError: sel is not defined 
 //do something
}

I should mention sel is normally empty at this point. Does JS some how not allow global arrays to be set?

Upvotes: 1

Views: 1666

Answers (3)

Nokia808Freak
Nokia808Freak

Reputation: 921

To make the Objects/Variables Global you can use the simple method Of declaring it outside the function block

sample

var test;
var sel;

window.onload = function(){
   test = 'test';
   sel = new Array();
   login_check();
};

Hope this helps!

Upvotes: 0

Yogendra Singh
Yogendra Singh

Reputation: 34367

I advice to move the variables outside the function e.g.

var test;
var sel;
window.onload = function(){
    test = 'test';
    sel = new Array();
    login_check();
  };

Upvotes: 1

Praveen Kumar Purushothaman
Praveen Kumar Purushothaman

Reputation: 167182

Instead make it truly global:

window.onload = function(){
   var window.test = 'test';
   var window.sel = new Array();
   login_check();
};

And in the function:

console.log(window.test); //displays as intended
if(window.sel.length > 0) {
 //do something
}

If still the same problem, it might be due to this, as window.sel is an empty array, it can be considered as null.

Try another method to keep the variable declaration out of the function:

var test;
var sel;
window.onload = function(){
   test = 'test';
   sel = new Array();
   login_check();
};

Upvotes: 0

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