page visibility API : tribulations with prefixes

gistfile1.js

// this is the least sucky way i could think of to 
// detect and deal with a cross-browser impl of the page visibility api
// forks welcome.


function getHiddenProp(){
    var prefixes = ['webkit','moz','ms','o'];
    
    if ('hidden' in document) return 'hidden';
    
    for (var i = 0; i < prefixes.length; i++){
        if ((prefixes[i] + 'Hidden') in document) 
            return prefixes[i] + 'Hidden';
    }        
}

function isHidden(){
    var prop = getHiddenProp();
    if (!prop) return false;
    
    return document[prop];
}

// events
var evtname = getHiddenProp().replace(/[H|h]idden/,'') + 'visibilitychange';
document.addEventListener(evtname, fn)




// just logging it out. log it out, man.
console.log('getHiddenProp()', getHiddenProp());
console.log('isHidden()', isHidden());


function fn(){}

function isHidden(){
return document[getHiddenProp()] || false;
}

function getHiddenProp(){
var prefixes = ['webkitHidden','mozHidden','msHidden','oHidden', 'hidden'],l=prefixes.length;
while(l-- && !(prefixes[l] in document));
return prefixes[l];
}