Using data attributes with jQuery

Question

I have this button:

Answer 1

I think data will look on lowercases: alert($(this).data("themevalue")) //grid

or if you want to use themeValue you need to use:

edit:

I was wrong, it doesnt have anything to do with lowercases, you can use themeValue if you are having the attribute: data-theme-value then you call itwith $(element).data("themeValue")

$(".themeChanger").click(function() {
    var el = $(this);

    alert($(this).data("themeValue")); //Theme2
    alert($(this).data("themevalue")); //Theme1
});