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Javascript add class and keep original

Im using the following:

url=location.href fname=url.match(/.*\/(.*)\./)[1] document.body.className=fname

This takes a portion of the URL and adds the class to the <body> with the text extracted from the URL.

However, the problem with this method is that the class only gets the application that no longer has the assigned class.

Im really looking for something similar to the JQUERY .addClass function, so the body becomes:

 <body class="originalClass filenameClass"> ... </body>
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4 answers

With jQuery you can do $("body.className").addClass(fname) or similarly without jQuery, you can do document.body.className + = "" + fname

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You do not need to replace the class, just add it like this:

 document.body.className += " " + fname

You might want to do some checking though for everything that comes through querystring ...

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According to specifications

classList returns a bullet list of the element's class attribute.

So you can do:

 document.body.classList.add(fname);

and it will work just like the jQuery addClass method. Only adding a class once and saving existing classes.

You can also do:

 document.body.classList.remove(fname);

if you want to delete the class later

toggles and contains methods also available initially

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document.body.className+=" "+fname

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