Using javascript variables anywhere

Question

Here's my jQuery function,

$.post("assets/scripts/chat/get_user_info.php", {UserID: UserID}, function(data){
if (data == "error") {
alertBar('negative','There was an error sending the message');
}
var username = data;
})

But I only use the "data" or "username" variable in the function itself, so how can I use it globally around the whole page?

create global variable username and assign the data in function. — Ramesh Kotha
– Ramesh Kotha, Commented Jan 20, 2012 at 17:27
Whatever answer you pick, do not forget to declare variables. It's perfectly legal to set a property in the global scope using window.username = data;. However, not declaring a variable using var is a bad practice, and will throw errors in strict mode. — Rob W
– Rob W, Commented Jan 20, 2012 at 17:29

Nate B · Accepted Answer · 2012-01-20 17:27:31Z

5

Define variable in the global scope, outside your function.

var username, data;

$.post("assets/scripts . . .

answered Jan 20, 2012 at 17:27

Nate B

6,34428 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

T. Stone · Accepted Answer · 2012-01-20 17:27:35Z

2

Either

window.data = data

or

username = data

The thing is though,the $.post is asynchronous, so you won't be able to do something like...

$.post( ... )
alert(window.data);

answered Jan 20, 2012 at 17:27

T. Stone

19.5k15 gold badges72 silver badges100 bronze badges

Comments

yeomandev · Accepted Answer · 2012-01-20 17:26:50Z

1

Try

var globalData;
var username;

$.post("assets/scripts/chat/get_user_info.php", {UserID: UserID}, function(data){
    if (data == "error") {
        alertBar('negative','There was an error sending the message');
    }
    globalData = data
    username = data;
})

answered Jan 20, 2012 at 17:26

yeomandev

11.8k25 gold badges94 silver badges151 bronze badges

Comments

parapura rajkumar · Accepted Answer · 2012-01-20 17:27:16Z

1

What you can do is

  var myglobaldata = {};

$.post("assets/scripts/chat/get_user_info.php", {UserID: UserID}, function(data){
if (data == "error") {
alertBar('negative','There was an error sending the message');
}
  myglobaldata.username = data;
})

Now you can access myglobaldata.username from anywhere.

answered Jan 20, 2012 at 17:27

parapura rajkumar

24.5k2 gold badges58 silver badges86 bronze badges

Comments

Didier Ghys · Accepted Answer · 2012-01-20 17:27:00Z

0

You could save it as data using .data():

$.post("assets/scripts/chat/get_user_info.php", {UserID: UserID}, function(data){
    if (data == "error") {
        alertBar('negative','There was an error sending the message');
    } else {
        $(document).data('userInfo', data);
    }
});

Then you can access it by doing:

var userInfo = $(document).data('userInfo');

answered Jan 20, 2012 at 17:27

Didier Ghys

30.6k9 gold badges77 silver badges82 bronze badges

Comments

Jivings · Accepted Answer · 2012-01-20 17:27:29Z

0

window.username = data

Will make it a global variable. Though this is often considered bad practice.

answered Jan 20, 2012 at 17:27

Jivings

23.3k7 gold badges63 silver badges102 bronze badges

Comments

Paul · Accepted Answer · 2012-01-20 17:34:24Z

0

I assume your jQuery is wrapped in $(document).ready(); - try declaring the vars outside like this, which will make them global throughout the page:

var username, data;

$(document).ready(function() {
    $.post("assets/scripts/chat/get_user_info.php", {UserID: UserID}, function(data){
    if (data == "error") {
        alertBar('negative','There was an error sending the message');
    }
    username = data;
    })
});

answered Jan 20, 2012 at 17:34

Paul

2,20621 silver badges26 bronze badges

1 Comment

Frank Over a year ago

The whole thing is inside a function.

Elmo · Accepted Answer · 2012-01-20 18:05:01Z

0

Try document.username instead of username

document object is visible from everywhere

edited Jan 20, 2012 at 18:05

Elmo

6,50717 gold badges81 silver badges143 bronze badges

answered Jan 20, 2012 at 17:27

Dmitry

1234 silver badges14 bronze badges

Collectives™ on Stack Overflow

Using javascript variables anywhere

8 Answers 8

Comments

Comments

Comments

Comments

Comments

Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

8 Answers 8

Comments

Comments

Comments

Comments

Comments

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related