I have been implementing the yepnope script loader as part of the modernizr.js library. I have successfully got jQuery to load and jQuery dependent scripts afterwards. I am new to asynchronous loading of resources, so it's a bit new to me. I have been searching around, but haven't had much luck with the following.
My question is what are your opinions on how to effectively replace the functionality of $(document).ready() when working with the yepnope.js framework.
My theory was to create a appropriately named function in my base library and then set that variable on my pages to an anonymous function containing my existing $(document).ready() code. This variable would then be called by yepnope after all the scripts had loaded in the complete callback.
Would you agree that this is a good way of doing it, or am I approaching this entirely the wrong way?
(For those unaware, the asynchronous nature of yepnope.js means that the document calls $ or jQuery before the yepnope loader has finished, throwing a "$ is undefined" error <- please correct me if that is wrong.)
First question, hope it's a good one.
This is the technique I use. It allows me to sprinkle $(document).ready() style calls wherever I like. Using this method, you can take a site that already uses jQuery and has existing $(document).ready() calls, and easily retrofit yepnope.
First, add this line of JS, preferably in the document head, before any javascript that calls $(document).ready():
<script>
var docready=[],$=function(o){function r(fn){docready.push(fn);}if(typeof o === 'function') r(o);return{ready: r}};
</script>
Then, have your yepnope jQuery test object set similar to this:
yepnope({
load: '//ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js',
complete: function() {
$ = jQuery;
for(n in docready) $(document).ready(docready[n]);
}
});
We create a fake $(document).ready() before jQuery loads. This stores every $(document).ready() call in an array, docready. Then, once jQuery has loaded, we overwrite our temporary $ object with the now loaded real jQuery object. Then, we iterate through all the stored $(document).ready() calls, and execute them for real.
UPDATED: improved version from Chris Jones that also covers $(function() {}) style invocations.