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fix(aio): googlebot polyfill fix

This commit is contained in:
Igor Minar 2017-05-27 13:04:22 -07:00 committed by Igor Minar
parent cb2cb7c3bd
commit 9326e062d8
1 changed files with 20 additions and 12 deletions
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32
aio/src/index.html
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@ -37,20 +37,28 @@
<!-- End Google Analytics -->
<script>
/**
* Send a blocking request to fetch polyfill. We call this only on non-evergreen browsers.
*/
function polyfillBrowser(polyfillUrl) {
var script = document.createElement('script');
script.src = polyfillUrl;
document.head.appendChild(script);
}
if (window.document.documentMode) {
// polyfill IE11
polyfillBrowser('generated/ie-polyfills.min.js');
// polyfill IE11 in a blocking way
var s = document.createElement('script');
s.src = 'generated/ie-polyfills.min.js';
document.head.appendChild(s);
} else if (!Object.assign) {
// polyfill googlebot
polyfillBrowser('https://cdn.polyfill.io/v2/polyfill.min.js?unknown=polyfill');
// polyfill other non-evergreen browsers in a blocking way
var polyfillUrl = "https://cdn.polyfill.io/v2/polyfill.min.js?features=default,Array.prototype.find&flags=gated&unknown=polyfill";
// send a blocking XHR to fetch the polyfill
// then append it to the document so that its eval-ed synchronously
// this is required because the method used for IE is not reliable with other non-evergreen browsers
var xhr = new XMLHttpRequest();
xhr.addEventListener("load", function() {
var s = document.createElement('script');
s.type = 'text/javascript';
var code = this.responseText;
s.appendChild(document.createTextNode(code));
document.head.appendChild(s);
});
xhr.open("GET", polyfillUrl, false);
xhr.send();
}
</script>
</head>