Add class to an element

Question

I try to write these code to make grid view through CSS:( jsbin )

   var tables = document.getElementsByClassName(\'tableData\');
    var rows = tables[0].getEle         


        

Answer 1

This should work even when the attribute isn't already present:

rows[i].setAttribute("class", "alt");

http://www.w3schools.com/Dom/met_element_setattribute.asp