js detect mobile browser code example

Example 1: javascript get browser

//gets the type of browser
function detectBrowser() { 
    if((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1 ) {
        return 'Opera';
    } else if(navigator.userAgent.indexOf("Chrome") != -1 ) {
        return 'Chrome';
    } else if(navigator.userAgent.indexOf("Safari") != -1) {
        return 'Safari';
    } else if(navigator.userAgent.indexOf("Firefox") != -1 ){
        return 'Firefox';
    } else if((navigator.userAgent.indexOf("MSIE") != -1 ) || (!!document.documentMode == true )) {
        return 'IE';//crap
    } else {
        return 'Unknown';
    }
}

Example 2: js if mobile browser

// credit to Timothy Huang for this regex test: 
// https://dev.to/timhuang/a-simple-way-to-detect-if-browser-is-on-a-mobile-device-with-javascript-44j3
if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)){
  return true
}
else{
  return false
}