52 lines
2.1 KiB
JavaScript
52 lines
2.1 KiB
JavaScript
// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
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// IT'S JUST JUNK FOR OUR DOCS!
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// ++++++++++++++++++++++++++++++++++++++++++
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/*!
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* Copyright 2014-2015 Twitter, Inc.
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*
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* Licensed under the Creative Commons Attribution 3.0 Unported License. For
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* details, see https://creativecommons.org/licenses/by/3.0/.
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*/
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// Intended to prevent false-positive bug reports about Bootstrap not working properly in old versions of IE due to folks testing using IE's unreliable emulation modes.
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(function () {
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'use strict';
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function emulatedIEMajorVersion() {
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var groups = /MSIE ([0-9.]+)/.exec(window.navigator.userAgent)
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if (groups === null) {
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return null
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}
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var ieVersionNum = parseInt(groups[1], 10)
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var ieMajorVersion = Math.floor(ieVersionNum)
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return ieMajorVersion
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}
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function actualNonEmulatedIEMajorVersion() {
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// Detects the actual version of IE in use, even if it's in an older-IE emulation mode.
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// IE JavaScript conditional compilation docs: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx
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// @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx
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var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // jshint ignore:line
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if (jscriptVersion === undefined) {
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return 11 // IE11+ not in emulation mode
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}
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if (jscriptVersion < 9) {
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return 8 // IE8 (or lower; haven't tested on IE<8)
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}
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return jscriptVersion // IE9 or IE10 in any mode, or IE11 in non-IE11 mode
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}
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var ua = window.navigator.userAgent
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if (ua.indexOf('Opera') > -1 || ua.indexOf('Presto') > -1) {
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return // Opera, which might pretend to be IE
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}
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var emulated = emulatedIEMajorVersion()
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if (emulated === null) {
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return // Not IE
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}
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var nonEmulated = actualNonEmulatedIEMajorVersion()
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if (emulated !== nonEmulated) {
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window.alert('WARNING: You appear to be using IE' + nonEmulated + ' in IE' + emulated + ' emulation mode.\nIE emulation modes can behave significantly differently from ACTUAL older versions of IE.\nPLEASE DON\'T FILE BOOTSTRAP BUGS based on testing in IE emulation modes!')
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}
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})();
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