javascript variable in input value

Question

I have some problem. This is my code snippets :

FB.api('/me', function(me){
  if (me.id) {
  alert(me.id);
  //alert(me.email);
  var fbmail = me.email;
  alert(fbmail);
  document.write('<input id="mail" type="hidden" value="'+fbmail+'">');                    
  var retro = document.getElementById('mail').value;
  alert(retro);                    
})

My problem is that there is no alert(retro); :( Can you tell me what's wrong???

Sorry about my ignorance, but what is FB?

davidbuzatto
– davidbuzatto

2012-08-12 17:10:49 +00:00
Commented Aug 12, 2012 at 17:10 — davidbuzatto
– davidbuzatto, Commented Aug 12, 2012 at 17:10

SLaks · Accepted Answer · 2012-08-12 17:11:58Z

2

document.write can only be used while the page is loading.

Calling it in an async callback will erase the current page, so getElementById will return null.

answered Aug 12, 2012 at 17:11

SLaks

891k182 gold badges1.9k silver badges2k bronze badges

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

1 Comment

HeryMà Vala Litakwely Over a year ago

Thanx for all of your answer. I'm always searching for a solution.

Collectives™ on Stack Overflow

javascript variable in input value

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related