Code snippets, quotes, BASH scripts and nonsense. Not surprisingly, my main site is called Johann Burkard, too. Check out my web applications: WMA to MP3 converter, QR Code Generator, Pearson Correlation calculator, PDF to TIFF converter and Forex Data Feed. Also, check out Ole’s Tauschbörse Arbeit.

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Feb 01 2011

458 B cross-domain JavaScript/JSON-P loader

(Somewhat) readable

function load(u,c){
 var b=document, element = 'script', s=b.createElement(element), name=2166136261,
  i = u.length, backup = c, callback = /=\?/,
  b=b.body, x='onreadystatechange', y='onload', z='readyState';
 if (callback.test(u)) {
  while (i--) {
   name = (name * 16777619) ^ u.charCodeAt(i);
  }
  window[element += (name < 0 ? -name : name)] = function() {
   backup.apply(backup, arguments);
   delete window[element];
  }
  u = u.replace(callback, '=' + element);
  c = 0;
 }
 s[y]=s[x]=function(){
  if (/de|m/.test(s[z]||'m')) {
   c && c();
   b.removeChild(s);
   try { for (c in s) delete s[c]; } catch (e) {}
  }
 };
 s.src=u;
 window.setTimeout(function(){b.appendChild(s)},0);
}

Closure compressed (458 B)

function load(b,c){var d=document,f="script",a=d.createElement(f),e=2166136261,g=b.length,h=c,i=/=\?/,d=d.body;if(i.test(b)){for(;g--;)e=e*16777619^b.charCodeAt(g);window[f+=e<0?-e:e]=function(){h.apply(h,arguments);delete window[f]};b=b.replace(i,"="+f);c=0}a.onload=a.onreadystatechange=function(){if(/de|m/.test(a.readyState||"m")){c&&c();d.removeChild(a);try{for(c in a)delete a[c]}catch(b){}}};a.src=b;window.setTimeout(function(){d.appendChild(a)},0)};

• FNV hash prevents JSON-P callbacks from interfering with caching.
• Callback function is mandatory with JSON-P.
• Contains Neil Fraser’s JSONP memory leak prevention.
• Does not slow down the onload event.

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