Modernizr.load Deprecated. Yepnope.js Deprecated. Now what?

Question

Prior to Modernizr v3, I was using yepnope.js

Modernizr.load and yepnope.js have both been deprecated. How do we conditionally call stylesheets or javascript files n

Answer 1

There's a new syntax and the feature names are all lowercase. You can combine that with jQuery's getScript method.

Which would look something like this:

if (Modernizr.objectfit){
    jQuery.getScript("./dist/scripts/object-fit.js")
        //it worked! do something!
        .done(function(){
            console.log('js loaded');
        })
        //it didn't work! do something!
        .fail(function(){
            console.log('js not loaded');
        });
} else {
    jQuery(".poster img").imageScale({
        scale: "best-fill", 
        rescaleOnResize: true
    });
}

Answer 2

Have a look here for scripts: https://stackoverflow.com/a/7719185 — no jQuery required. (Note that there's a shorter Promise example a bit down in the answer; don't stop reading after the first example (like I did)).

And here for CSS: loadCSS: https://github.com/filamentgroup/loadCSS/blob/master/src/loadCSS.js

— this is, in a way, even better than YepNope.js, if you don't need any of its features except for just loading stuff + callback. Because the stuff linked above, is smaller (smaller min.js.gz) than yepnope.js.

(And can combine with Modernizr like mhk showed in his answer.)