jquery - How to defer javascript -


i using fancybox jquery plugin , trying defer javascript end of page loading

    <html>     <head>     </head>     <body>          content /*bottom of body*/         <script src="jquery-1.8.3.min.js" type="text/javascript"></script>         <script type="text/javascript" src="jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js" ></script>         <script type="text/javascript">             $(document).ready(function() {                 $(".example3").fancybox({                     'transitionin'  : 'none',                     'transitionout' : 'none'                     });             });         </script>     </body>     </html>

at point plugin works javascript not deferred. change script to

<script defer="defer" type="text/javascript">     window.onload=function(){         var mycode;         mycode=document.createelement("script");         mycode.type="text/javascript";         mycode.src="jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js";         document.getelementsbytagname("head")[0].appendchild(mycode);     } </script>

like read here, plugin work, doesn't work. according google pagespeed still need defer jquery-1.8.3.min.js script. if defer same way, google pagespeed seems ok it, plugin doesn't work @ all.

how supposed this?

complete solution based on jamed donnelly's answer:

i removed .js scripts head. added before tag:

<script> (function() {     function getscript(url,success){         var script=document.createelement('script');         script.src=url;         var head=document.getelementsbytagname('head')[0],         done=false;         script.onload=script.onreadystatechange = function(){         if ( !done && (!this.readystate || this.readystate == 'loaded' || this.readystate == 'complete') ) {             done=true;             success();             script.onload = script.onreadystatechange = null;             head.removechild(script);         }         };         head.appendchild(script);     }  getscript("jquery-1.8.3.min.js",function(){     getscript("jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js", function() {});     getscript("mycustomscript.js", function() {}); });  })(); </script>

i created file mycustomscript.js:

$(document).ready(function(){      $(".example3").fancybox({         'transitionin'  : 'none',         'transitionout' : 'none'         }); });

and that's all.

what i've been using while is:

(function() {     function getscript(url,success){         var script=document.createelement('script');         script.src=url;         var head=document.getelementsbytagname('head')[0],         done=false;         script.onload=script.onreadystatechange = function(){         if ( !done && (!this.readystate || this.readystate == 'loaded' || this.readystate == 'complete') ) {             done=true;             success();             script.onload = script.onreadystatechange = null;             head.removechild(script);         }         };         head.appendchild(script);     }     getscript("whatever1.js",function(){         getscript("whatever2.js", function() {});     }); })();

i'll have dig try , find got from.

edit: no luck on finding source of this, it's similar this article on css tricks.

in case you'd like:

getscript("jquery-1.8.3.min.js",function(){     getscript("jquery.fancybox-1.3.4/fancybox/jquery.fancybox-1.3.4.pack.js", function() {});     getscript("mycustomscript.js", function() {}); });

where mycustomscript.js file containing document ready handler. loads jquery, once that's loaded loads plugin , script.


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