How to get all elements by class name? [duplicate]

Answer 1

document.getElementsByClassName('your class');  

or you can build your classname like this, if that doesn't work try this

if (!document.getElementsByClassName) {
    document.getElementsByClassName=function(cn) {
        var allT=document.getElementsByTagName('*'), allCN=[], i=0, a;
        while(a=allT[i++]) {
            a.className==cn ? allCN[allCN.length]=a : null;
        }
        return allCN
    }
}