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§ Simpler adding & removing element classnames

Just use the javascript replace function...

The way I used to do this is just dumb; the replace function is quite straightforward and most likely faster.

 

function removeClassName(el, name) {
  el.className = el.className.replace(name, '');
}
function addClassName(el, name) {
  //don't waste time if it's already there
  if(el.className.indexOf(name)>-1)
    return;
  el.className += ' '+name;
}

//or, if you have reason to believe it's not already there, just
myelement.className+=' myclassname';

//swap known names
myelement.className = myelement.className.replace('oldName', 'newName');

last edited on May 7th, 2010 at 6:35 PM

Comments

Slashback says:

Actually, the addClassName function does what you want, pretty much the same way you suggest.

July 26th, 2012 at 7:36 AM

angie says:

And what if I want to add a class, but keeping the csseals the element already has?I mean, I have an element with a class, let's name it myClass1, and I want to add a secondary class, let's name it myClass2; to apply some effects dynamically.Is there any method to do it, or do i need to use something like:document.getElementById("blah").className = document.getElementById("blah").className+" myClass2"(I don't know if this workaround may work)thanks in advance!!

July 26th, 2012 at 6:42 AM

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The first principle of the military analyst is to figure out how the enemy can hurt you worst with his known capabilities and then plan to stop him, not hope he won’t try it.
Early Honor Harrington series, David Weber