d2-ui
Version:
44 lines (39 loc) • 1.57 kB
JavaScript
/**
* Check if the users browser is a version of Internet Explorer
*
* @param [ua] The users user-agent string.
* @returns {boolean|number} Returns the version number (10, 11, 12) when the browser is IE, otherwise `false`
*
* @example
* // When using IE10
* isIE(); // Returns: 10
*
* // When using FireFox
* isIE(); // Returns: false
*
* TODO: It is not very good practice to return two different types of values from a function. Perhaps we can return `true` on IE and have a secondary function to get the version?
*/
export default function isIE(ua = window.navigator.userAgent) {
// test values
// IE 10: ua = 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)';
// IE 11: ua = 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko';
// IE 12 / Spartan: ua = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Edge/12.0';
var msie = ua.indexOf('MSIE ');
if (msie > 0) {
// IE 10 or older => return version number
return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
}
var trident = ua.indexOf('Trident/');
if (trident > 0) {
// IE 11 => return version number
var rv = ua.indexOf('rv:');
return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
}
var edge = ua.indexOf('Edge/');
if (edge > 0) {
// IE 12 => return version number
return parseInt(ua.substring(edge + 5, ua.indexOf('.', edge)), 10);
}
// other browser
return false;
}