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Loading multiple 3rd party widgets asynchronously

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multiple-3rd-party-widgets.js
JavaScript
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(function() {
var script,
scripts = document.getElementsByTagName('script')[0];
function load(url) {
script = document.createElement('script');
script.async = true;
script.src = url;
scripts.parentNode.insertBefore(script, scripts);
}
load('//apis.google.com/js/plusone.js');
load('//platform.twitter.com/widgets.js');
load('//s.widgetsite.com/widget.js');
}());

If there's no previous script tag on the page, won't scripts.parentNode throw a (Cannot read property parentNode of undefined) error ?

also any for in loop should use hasOwnProperty to protect for any prototype modifications on the page.

1) You're always going to have a script tag on the page, because you need to add the script above somehow

Very true! Good point =)

You also might want to wrap this in a function to protect the variable namespaces.

As you don't use the object keys, maybe it would be better to loop an array instead (performance).

Shouldn't

}());

be

})(); ?

@harry1989 Both are valid Javascript. But if you want an opinionated answer, try Crockford http://www.youtube.com/watch?v=taaEzHI9xyY&feature=youtu.be#t=33m39s

Similar to this one: https://gist.github.com/necolas/1025811 , although i find that one much better.

How about to pass the "document" as parameter into scope?

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