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    <p>Actualy, there's a better solution.</p> <p>There are 2 things that you could do better:</p> <ol> <li>In your <code>FB.init</code> method, you're setting <code>status: true</code>. This tells the page that it should check whether the user is logged in the facebook immediately after page loads. In your case, it's not only that you don't need it - it will take some of your visitor's bandwidth for round trip to facebook that you don't actually need.</li> <li>You don't need to remember uid and accessToken variables since you can get them on demand by using <code>FB.getLoginStatus</code> method.</li> </ol> <p>The complete solution based on your sample code would be:</p> <pre><code>&lt;div id="fb-root"&gt;&lt;/div&gt; &lt;script&gt; window.fbAsyncInit = function() { FB.init({ appId : 'YOUR APP ID', status : false, cookie : true, xfbml : true }); }; (function(d){ var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0]; if (d.getElementById(id)) {return;} js = d.createElement('script'); js.id = id; js.async = true; js.src = "//connect.facebook.net/en_US/all.js"; ref.parentNode.insertBefore(js, ref); }(document)); function Facebook_login () { FB.getLoginStatus(function(response) { if (response.status === 'connected') { var uid = response.authResponse.userID; var accessToken = response.authResponse.accessToken; if ((parseFloat(uid) == parseInt(uid)) &amp;&amp; !isNaN(uid)) { $.ajax({ url: '/user_actions/prep_facebook_registration', cache: false, type: 'POST', data: { 'uid': uid, 'token': accessToken }, dataType: 'json', success: function(data) { if (data.success=='true') { if ((typeof(data.redirect) != 'undefined')) { if (data.redirect=='current') { location.reload(); } else { window.location=data.redirect; } } } } }); } } } } &lt;/script&gt; &lt;div class="fb-login-button" onlogin="Facebook_login()" autologoutlink="true" [parameters]&gt;&lt;/div&gt; </code></pre>
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    1. POFacebook login JS - FB.Event.subscribe('auth.login') triggers without login button click
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    1. COI like this one. The following code seems not so pretty: "parseFloat(uid) == parseInt(uid)) && !isNaN(uid)"
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    2. COYeah, I don't like it either but since Javascript doesn't come with built-in function to check if some text is integer value, this is the best way to do the check. For example, see this question - http://stackoverflow.com/questions/3885817/how-to-check-if-a-number-is-float-or-integer
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