Remove comma with jQuery

Example: link

Option A

You can use a regular expression to take only the last comma. I've also put together another replace to clean up blanks.

var string = $('.tags').text();
string = string.replace(' ','').replace(/,+$/, "");

The $ selector in regular expressions indicates end of string.

Option B

You can also just remove the last character from the string like this:

var string = $('.tags').text();
string = string.replace(' ','');              // limpar espaços em branco
string = string.substr(0, string.length - 1); // usar todos os caracters até ao penúltimo

Note that this option removes any last character. Not just a comma.

EDIT: I noticed in the comments below that each tag has its element <a> in this case you have to use the pseudo-selector :last or .last() as you suggested in the question (and I did not give you any attention) p>

So you can pass a function to .html() of jQuery and do:

$('.tags:last').html(function () {
    var string = $(this).text();
    string = string.replace(' ', '').replace(/,+$/, "");
    $(this).text(string)
});

Example: link

var noCommas = $('.tags').text().replace(/,/g, ''),
    asANumber = +noCommas;

Just use replace

If you want to check the last character, follow the full function:

if (campo.substring(campo.length-1) == ",")
{
    replace
}