gh-spa.js

// Single Page Apps for GitHub Pages
// https://github.com/rafrex/spa-github-pages
// Copyright (c) 2016 Rafael Pedicini, licensed under the MIT License
// ----------------------------------------------------------------------

var spa = {

    // Call it from Index.html
    // ----------------------------------------------------------------------
    // This script takes the current url and converts the path and query
    // string into just a query string, and then redirects the browser
    // to the new url with only a query string and hash fragment,
    // e.g. http://www.foo.tld/one/two?a=b&c=d#qwe, becomes
    // http://www.foo.tld/?p=/one/two&q=a=b~and~c=d#qwe
    // Note: this 404.html file must be at least 512 bytes for it to work
    // with Internet Explorer (it is currently > 512 bytes)
    handle404: function () {
        
        // If you're creating a Project Pages site and NOT using a custom domain,
        // then set segmentCount to 1 (enterprise users may need to set it to > 1).
        // This way the code will only replace the route part of the path, and not
        // the real directory in which the app resides, for example:
        // https://username.github.io/repo-name/one/two?a=b&c=d#qwe becomes
        // https://username.github.io/repo-name/?p=/one/two&q=a=b~and~c=d#qwe
        // Otherwise, leave segmentCount as 0.
        var segmentCount = 0;

        var l = window.location;
        l.replace(
            l.protocol + '//' + l.hostname + (l.port ? ':' + l.port : '') +
            l.pathname.split('/').slice(0, 1 + segmentCount).join('/') + '/?p=/' +
            l.pathname.slice(1).split('/').slice(segmentCount).join('/').replace(/&/g, '~and~') +
            (l.search ? '&q=' + l.search.slice(1).replace(/&/g, '~and~') : '') +
            l.hash
        );
    },

    // Call it from 404.html
    // ----------------------------------------------------------------------
    // This script checks to see if a redirect is present in the query string
    // and converts it back into the correct url and adds it to the
    // browser's history using window.history.replaceState(...),
    // which won't cause the browser to attempt to load the new url.
    // When the single page app is loaded further down in this file,
    // the correct url will be waiting in the browser's history for
    // the single page app to route accordingly.
    handleRedirectFrom404: function () {
        (function (l) {
            if (l.search) {
                var q = {};

                l.search.slice(1).split('&').forEach(function (v) {
                    var a = v.split('=');
                    q[a[0]] = a.slice(1).join('=').replace(/~and~/g, '&');
                });

                if (q.p !== undefined) {
                    window.history.replaceState(null, null,
                        l.pathname.slice(0, -1) + (q.p || '') +
                        (q.q ? ('?' + q.q) : '') +
                        l.hash
                    );
                }
            }
        }(window.location))
    }
}