Suppose I want to display certain content only if I know the user coming to my website has a valid Google Account and it's logged into that account.

Is there any way to do this in Javascript? I know that the Facebook API provides ways to tell the status of a user (logged in Facebook) and I'm sure I've seen sites doing this with Google Accounts as well, but searching for the relevant terms in Google leads me to nowhere as the search terms are poorly focused.

Thank you for any help.

Suppose I want to display certain content only if I know the user coming to my website has a valid Google Account and it's logged into that account.

Is there any way to do this in Javascript? I know that the Facebook API provides ways to tell the status of a user (logged in Facebook) and I'm sure I've seen sites doing this with Google Accounts as well, but searching for the relevant terms in Google leads me to nowhere as the search terms are poorly focused.

Thank you for any help.

• javascript
• authentication

• Because I want to display links only if a user is logger to Google. – Cristiano Paris Commented Feb 9, 2011 at 13:40

2 Answers 2

This blog claims to have done it, via checking for image return values linked to the social platforms provided by G+ / twitter / etc

http://www.tomanthony.co.uk/blog/detect-visitor-social-networks/

<img style="display:none;"
onload="show_login_status('Google', true)"
onerror="show_login_status('Google', false)"
src="https://accounts.google.com/CheckCookie?continue=https%3A%2F%2Fwww.google.com%2Fintl%2Fen%2Fimages%2Flogos%2Faccounts_logo.png&followup=https%3A%2F%2Fwww.google.com%2Fintl%2Fen%2Fimages%2Flogos%2Faccounts_logo.png&chtml=LoginDoneHtml&checkedDomains=youtube&checkConnection=youtube%3A291%3A1"
/>

<script type="text/javascript">
function show_login_status(network, status){

    if(status == false){
        alert('NOT LOGGED IN');
    }
    if(status == true){
        alert('Logged In');
    }


}


</script>

<img style="display:none;"
onload="show_login_status('Google', true)"
onerror="show_login_status('Google', false)"
src="https://accounts.google.com/CheckCookie?continue=https%3A%2F%2Fwww.google.com%2Fintl%2Fen%2Fimages%2Flogos%2Faccounts_logo.png&followup=https%3A%2F%2Fwww.google.com%2Fintl%2Fen%2Fimages%2Flogos%2Faccounts_logo.png&chtml=LoginDoneHtml&checkedDomains=youtube&checkConnection=youtube%3A291%3A1"
/>

This will work.