javascript - handling redirect while loading JS through Script Tag in Head of HTML document -

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there 2 cases:

1) loading js file facebook site using script tag.if site blocked network access manager (websense) getting 302 response , autmatically redirected page. how handle condition ?

2) if point #1 passes internally creates iframe , try access facebook site if blocked same thing happen time text appear on page along other page content visible user. how handle ?

please me out here.

regards, pv

the easiest way handle first case check variable or namespace loaded javascript facebook.

// lets assume facebook js file contains "fb" namespace if(fb || window.fb){   // action since have facebook loaded   var fbframe = document.getelementsbytagname('iframe')[0];   fbframe.onerror = function(){     // facebook failed load :( redirect     window.location.href = "someotherpage.html";   }; }else{   // facebook failed load :( redirect   window.location.href = "someotherpage.html"; }

for second part, can add onerror event listener iframe. when error occurs loading iframe, onerror handler invoked.

here's question covers it: how can handle errors in loading iframe?


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