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Diffstat (limited to 'site/docs/4.4/assets/js/src/ie-emulation-modes-warning.js')
-rw-r--r-- | site/docs/4.4/assets/js/src/ie-emulation-modes-warning.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/site/docs/4.4/assets/js/src/ie-emulation-modes-warning.js b/site/docs/4.4/assets/js/src/ie-emulation-modes-warning.js new file mode 100644 index 0000000000..610128e273 --- /dev/null +++ b/site/docs/4.4/assets/js/src/ie-emulation-modes-warning.js @@ -0,0 +1,47 @@ +// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT +// IT'S ALL JUST JUNK FOR OUR DOCS! +// ++++++++++++++++++++++++++++++++++++++++++ + +// 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. +(function () { + 'use strict' + + function emulatedIEMajorVersion() { + var groups = /MSIE ([0-9.]+)/.exec(window.navigator.userAgent) + if (groups === null) { + return null + } + var ieVersionNum = parseInt(groups[1], 10) + var ieMajorVersion = Math.floor(ieVersionNum) + return ieMajorVersion + } + + function actualNonEmulatedIEMajorVersion() { + // Detects the actual version of IE in use, even if it's in an older-IE emulation mode. + // IE JavaScript conditional compilation docs: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx + // @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx + var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // eslint-disable-line no-new-func + if (typeof jscriptVersion === 'undefined') { + return 11 // IE11+ not in emulation mode + } + if (jscriptVersion < 9) { + return 8 // IE8 (or lower; haven't tested on IE<8) + } + return jscriptVersion // IE9 or IE10 in any mode, or IE11 in non-IE11 mode + } + + var ua = window.navigator.userAgent + if (ua.indexOf('Opera') > -1 || ua.indexOf('Presto') > -1) { + return // Opera, which might pretend to be IE + } + var emulated = emulatedIEMajorVersion() + if (emulated === null) { + return // Not IE + } + var nonEmulated = actualNonEmulatedIEMajorVersion() + + if (emulated !== nonEmulated) { + // eslint-disable-next-line no-alert + 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!') + } +}()) |