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 will only add the class name if it doesn't already exist

var classToAdd = 'alt';
if (rows.className.length == 0)
{
  rows.className = classToAdd;
}
else if (rows.className.indexOf(classToAdd) < 0)
{
  rows.className += ' ' + classToAdd;
}