discourse/vendor/assets/javascripts/browser-update.js.erb

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//browser-update.org notification script, <browser-update.org>
//Copyright (c) 2007-2009, MIT Style License <browser-update.org/LICENSE.txt>
(function() {
var $buo = function() {
var badAndroid = false, ua = null;
// Sometimes we have to resort to parsing the user agent string. :(
if (navigator && navigator.userAgent) {
ua = navigator.userAgent;
}
if (ua && (ua.indexOf('Android 2.2') >= 0 || ua.indexOf('Android 2.3') >= 0)) {
// Android 2.2 and 2.3 browsers report that they have pushState, but they don't really.
// See http://caniuse.com/#search=pushstate
badAndroid = true;
}
// sam: my main concern here is mobile, but its an outlier, for now we support ie9, set conditionally and stuff with pushState
if (window.ie === "new" || (window.history && window.history.pushState && !badAndroid)) {
return;
}
// we don't ask Googlebot to update their browser
if (ua.indexOf('Googlebot') >= 0 || ua.indexOf('Mediapartners') >= 0 || ua.indexOf('AdsBot') >= 0) {
return;
}
// retrieve localized browser upgrade text
var t = <%= "'" + I18n.t('js.browser_update') + "'" %>;
// create the notification div HTML
var div = document.createElement("div");
div.className = "buorg";
div.innerHTML = "<div>" + t + "</div>";
// create the notification div stylesheet
var sheet = document.createElement("style");
var style = ".buorg {position:absolute; z-index:111111; width:100%; top:0px; left:0px; background:#FDF2AB; text-align:left; font-family: sans-serif; color:#000; font-size: 14px;} .buorg div {padding: 8px;} .buorg a, .buorg a:visited {color:#E25600; text-decoration: underline;}";
// insert the div and stylesheet into the DOM
document.body.appendChild(div); // put it last in the DOM so Googlebot doesn't include it in search excerpts
document.getElementsByTagName("head")[0].appendChild(sheet);
try {
sheet.innerText = style;
sheet.innerHTML = style;
}
catch(e) {
try {
sheet.styleSheet.cssText = style;
}
catch(ex) {
return;
}
}
// shift the body down to make room for our notification div
document.body.style.marginTop = (div.clientHeight) + "px";
};
$bu=$buo();
})(this);