Browser Compatibility with JavaScript

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Is there any tool or method to recognize which browser the user is using and is it compatible with the version of JS and JQuery that exists on my system?

The idea is if it is not compatible, alert the user and lock the system.

    
asked by anonymous 12.09.2017 / 21:36

3 answers

0

The question was whether the client's browser was compatible with the javascript features that the system used. The Modernizr library was used to solve the problem. The same as the support for checking the features that the browser supports.

    
13.09.2017 / 16:42
0

To detect the browser and its version, you can use the following function, where an object with the browser name, its version, and other browser information will be returned: 

    // Opera 8.0+
var opera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    // Firefox 1.0+
var firefox = typeof InstallTrigger !== 'undefined';
    // At least Safari 3+: "[object HTMLElementConstructor]"
var safari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
    // Internet Explorer 6-11
var ie = /*@cc_on!@*/false || !!document.documentMode;
    // Edge 20+
var iedge = !isIE && !!window.StyleMedia;
    // Chrome 1+
var chrome = !!window.chrome && !!window.chrome.webstore;
    // Blink engine detection
var blink = (isChrome || isOpera) && !!window.CSS;

To detect the browser and its version, you can use the following function, where an object with the browser name, its version, and other browser information will be returned: 

function get_browser(){
    var ua=navigator.userAgent,tem,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 {name:'IE',version:(tem[1]||'')};
        }   
    if(M[1]==='Chrome'){
        tem=ua.match(/\bOPR\/(\d+)/)
        if(tem!=null)   {return {name:'Opera', version:tem[1]};}
        }   
    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 {
      name: M[0],
      version: M[1]
    };
 }

Source: How to know which version of the browser dynamically ?

    
12.09.2017 / 21:44
0
Using J-query is already a strategy for code javascript to run in many browsers even in the old ones, but of course there are some exceptions like when the browser is prehistoric or when the user turns off javascript , an alternative to such cases is to use no-script , example ... 

<!DOCTYPE html>
<html>
<body>

<script>
document.write("Hello World!")
</script>
<noscript>Desculpe! esse navegador não suporta javascript</noscript>

<p>Esse navegador suporta javascript</p>
 
</body>
</html>

Reference W3schools

    
12.09.2017 / 21:48
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