how to check browser version and set alert-CodePudding

I want to create code which will auto get the user's browser version and check it , if it was for example less than 50 popup alert which say "You can not access to this website(Update your Browser)" and open error page.

CodePudding user response：

Why not just do that serverside prior to even delivering the page ? The HTTP request often includes a user agent header (which is the browser brand/version/etc).

The exact implementation depends on what exactly your "site" is and on what type of webserver it runs.

If it's a PHP application then you could use $_SERVER['HTTP_USER_AGENT'].

If the site uses plain old static .html files and runs on Apache httpd, then you could use RewriteCond %{HTTP_USER_AGENT} ...something...

and so on.

CodePudding user response：

You can use Browser detect which gives you information regarding your browser and versions

alert(BrowserDetect.browser);
alert(BrowserDetect.version);

Another option is using navigator.appVersion but it was deprecated lately

alert(navigator.appVersion);

CodePudding user response：

This is the other solution :

navigator.sayswho= (function(){
var ua= navigator.userAgent;
var tem; 
var M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d )/i) || [];
if(/trident/i.test(M[1])){
    tem=  /\brv[ :] (\d )/g.exec(ua) || [];
    return 'IE ' (tem[1] || '');
}
if(M[1]=== 'Chrome'){
    tem= ua.match(/\b(OPR|Edge)\/(\d )/);
    if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera');
}
M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
if((tem= ua.match(/version\/(\d )/i))!= null) M.splice(1, 1, tem[1]);
return M.join(' ');})();

alert(navigator.sayswho);