vue-script2

vue-script2

Fully restores the <script> tag to front-end single-page-app (SPA) frameworks! This version is for Vue.js, but it's easy to port to Riot.js and others.

It's meant for internal use, not for standalone components that are being shared publicly. Those should be "self-contained" and come with all the JS they need.

Features

• Just like <script> except with a 2, but even that can be fixed!
• Keep your app.js bundle small!
• Embrace Web Standards™ everyone knows and loves!
• Easy for web designers to pick up! If you know HTML, you already know how to use it!
• Tiny! Only 1kb! (min+gzip'd)
• Perfect for use in .ejs templates or .html files!
• No more including every library on every page or complicated "code splitting"!
• Ordered execution based on position in markup!
• Special unload attribute can be used to keep your app's memory usage low!

Installation

npm install vue-script2 --save

Then enable the plugin (in your main.js or wherever):

Vue.use(require('vue-script2'))

Usage

Note: all of the examples below use <script2>, but you can write <script> instead by using the script2ify browserify transform provided below! :smile:

Simple, Traditional, Asynchronous Loading of Scripts

Using vue-script2 with vue-router is simple. Say that only one of your routes displays a "page" that makes use of jQuery. Well, no need to include all of jQuery in your app.js bundle, now you can throw this in:

<script2 src="/path/to/jquery.min.js"></script2>

Boom!

And don't worry, script2 won't re-download scripts if they're already loaded.

Delayed Execution of Inlined JavaScript

Want to run some JavaScript only when a certain "page"/route is loaded?

<script2 src="/path/to/jquery.min.js"></script2>
<script2>
// Ordered execution should ensure that '$' is available here
$(document).ready(function () {
    // this code runs *only* when the route
    // that contains this code is loaded! :D->-<
})
</script2>

Cleaning Up Resources On Route Change

The unload attribute accepts JS expressions to run when the component is destroyed. This prevents your SPA from accumulating stuff in memory that's not being used:

<script2 src="/path/to/jquery.min.js" unload="jQuery.noConflict(true)"></script2>

Special support for async attribute

Although technically all scripts are inserted with s.async = false (since we're using document.write, see this wonderful article by Jake Archibald for details), setting the async attribute does make a meaningful difference.

By default, the loading of <script2> tags is serialized using promises so that one script loads after another has finished. If you don't care about the loading order, add async to have the script injected into the page immediately.

You can mix and match so that some <script2> tags are loaded immediately while others wait for the ones before them:

<script2 src="jquery.min.js"></script2>
<script2>$('#foo').text('hi!')</script2>
<!-- Load next script immediately, don't wait for jQuery -->
<script2 src="lib.js" async></script2>

Using <script> via browserify transform

The script2ify browserify transform below will (fairly safely) dynamically replace <script> tags with <script2> tags within .ejs, .html, and even .vue files!

var through = require('through2')
// This will replace <script> with <script2> in .html, .vue and .ejs files
// EXCEPT:
// - within <!-- comments -->
// - top-level <script> tags within .vue files
// Additional exclusion per: http://www.rexegg.com/regex-best-trick.html
// Excluding <pre> tags did not seem to work, however.
function script2ify (file) {
  return !/\.(vue|html|ejs)$/.test(file) // edit to support other file types
  ? through()
  : through(function (buf, encoding, cb) {
    // avoid replacing top-level <script> tags in .vue files
    var regex = /\.vue$/.test(file)
    ? /<!--.*?-->|^<script>|^<\/script>|(?:<(\/)?script([ >]))/gm
    : /<!--.*?-->|(?:<(\/)?script([ >]))/gm
    var replacement = (m, p1, p2) => p2 ? `<${p1 || ''}script2${p2}` : m
    cb(null, buf.toString('utf8').replace(regex, replacement))
  })
}

TODO

• Add tests + Travis CI. Not much to test though.

History

• 1.1.2 - Another bump to get npm.org to display script2ify in the README
• 1.1.1 - Identical to 1.1.0, just adds needed package.json info.
• 1.1.0 - Adds special support for async attribute.
• 1.0.0 - Initial release.

License

MIT