## Async Script Loader [](http://standardjs.com) Allows asynchronous loading of scripts and styles in a Single Page Application (or anything else, in fact): * Using a test to ensure that the code is only loaded once * Running a callback once the script is loaded * Running a callback if the script is already loaded * Not blocking the main thread ### Reasoning Having integrated a multitude of third-party SDKs from large, well known providers, I've come to the conclusion that not having a standard interface turns the whole thing into a minefield of callbacks, timers, random library-specific loader modules, and global objects on the window, resulting in XSS risks and all sort of other undesirable behaviour. This module aims to provide a standard way of loading third-party dependencies. ### Usage You pass a list of urls to the loader, along with a method for checking that your page is ready, and a callback to call when it is. Urls can be scripts or stylesheets. ### Script Tags You can use the module like so, for a library loaded from example.com, which, when loaded, adds an attribute called PROVIDER to the global window object. ```js ``` You can pass options for script tags. ```js ``` #### Style Tags You can include any number of tags, including style tags. When the last one has loaded, the callback will be called. ```js ``` No more tears! #### Inline scripts / Inline css You can use inline content for either type of tag by passing the configuration attribute `content` *instead* of `url`. This will write the content passed into the tag's body rather than setting it as an `href` or `src` attribute `url` will always take prescidence, so leave it out for `content` to work. ```js ```