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Load data while still loading other scripts and display data faster in jQuery, Backbone, Angular, ... apps
Filed under application tools › utilitiesShow AllPegasus
Pegasus is a tiny lib that lets you load JSON data while loading other scripts.
If you have a static website, using this technique, you can reduce the time to display data. Works with any JS lib (React, Vue, jQuery, ...).
Before
JSON (yellow bar) is downloaded several milliseconds after the JS library (orange bar).
After (with Pegasus)
JSON (yellow bar) and the JS library (orange bar) are downloaded at the same time.
Install
Embedded (recommended)
To save a network call, it's recommended to simply paste the following code pegasus.min.js in your HTML page before other scripts.
CDN
https://unpkg.com/@typicode/pegasus/dist/pegasus.min.js
npm
$ npm install @typicode/pegasus
Please note that pegasus is available on npm under @typicode/pegasus
Demo
http://typicode.github.io/pegasus
Benchmark
Average time to display data on the demo site.
jQuery only jQuery + Pegasus EDGE 3000 ms 2100 ms 3G 860 ms 640 ms DSL 270 ms 230 ms Note: jQuery is used for illustration only, you can use Pegasus with any other Javascript library.
Usage example
<!-- Load (or embed) Pegasus before loading any other script --> <script src="pegasus.min.js"></script> <!-- Make your request(s) --> <script> var request = pegasus('http://api.example.com'); </script> <!-- Load your app lib(s) --> <script src="lib.js"></script> <!-- Use .then() method to retrieve data in your app --> <script> request.then( // success handler function(data, xhr) { // do something useful like $('#data').text(JSON.stringify(data)); }, // error handler (optional) function(data, xhr) { console.error(data, xhr.status) } ); </script>
Optionally, you can set a timeout using
pegasus.timeout = milliseconds
Support
All modern browsers and IE9+
License
MIT - Typicode