discourse/app/assets/javascripts/browser-update.js

83 lines
3.1 KiB
JavaScript

//browser-update.org notification script, <browser-update.org>
//Copyright (c) 2007-2009, MIT Style License <browser-update.org/LICENSE.txt>
/* eslint-disable no-var */
(function () {
var $buo = function () {
// Sometimes we have to resort to parsing the user agent string. :(
if (navigator && navigator.userAgent) {
var ua = navigator.userAgent;
// we don't ask Googlebot to update their browser
if (
ua.indexOf("Googlebot") >= 0 ||
ua.indexOf("Mediapartners") >= 0 ||
ua.indexOf("AdsBot") >= 0
) {
return;
}
}
if (!window.unsupportedBrowser) {
return;
}
document.getElementsByTagName("body")[0].className += " crawler";
var mainElement = document.getElementById("main");
var noscriptElements = document.getElementsByTagName("noscript");
// find the element with the "data-path" attribute set
for (var i = 0; i < noscriptElements.length; ++i) {
if (noscriptElements[i].getAttribute("data-path")) {
// noscriptElements[i].innerHTML contains encoded HTML, so we need to access
// the childNodes instead. Browsers seem to split very long content into multiple
// text childNodes.
var result = "";
for (var j = 0; j < noscriptElements[i].childNodes.length; j++) {
result += noscriptElements[i].childNodes[j].nodeValue;
}
mainElement.outerHTML = result;
break;
}
}
// retrieve localized browser upgrade text
var t = I18n.t("browser_update"); // eslint-disable-line no-undef
if (t.indexOf(".browser_update]") !== -1) {
// very old browsers might fail to load even translations
t =
'Unfortunately, <a href="https://www.discourse.org/faq/#browser">your browser is too old to work on this site</a>. Please <a href="https://browsehappy.com">upgrade your browser</a> to view rich content, log in and reply.';
}
// 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;} @media print { .buorg { display: none !important; } }";
// 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(); // eslint-disable-line no-undef
})(this);