jquery - is not a function error

Question

Here is my code:

(function($){
    $.fn.pluginbutton = function (options) {
        myoptions = $.extend({ left: true });
        return this.each(function () {
            var focus = false;
            if (focus === false) {
                this.hover(function () {
                    this.animate({ backgroundPosition: "0 -30px" }, { duration: 0 });
                    this.removeClass('VBfocus').addClass('VBHover');
                }, function () {
                    this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                    this.removeClass('VBfocus').removeClass('VBHover');
                });
            }
            this.mousedown(function () {
                focus = true
                this.animate({ backgroundPosition: "0 30px" }, { duration: 0 });
                this.addClass('VBfocus').removeClass('VBHover');
            }, function () {
                focus = false;
                this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                this.removeClass('VBfocus').addClass('VBHover');
            });
        });
    }
});


$(document).ready(function () {
    $('.smallTabsHeader a').pluginbutton();
});

It gives me an error. What's wrong?

Answer 1

In Wordpress jQuery.noConflict() is called on the jQuery file it includes (scroll to the bottom of the file it's including for jQuery to see this), which means $ doesn't work, but jQuery does, so your code should look like this:

<script type="text/javascript">
  jQuery(function($) {
    for(var i=0; i <= 20; i++) 
      $("ol li:nth-child(" + i + ")").addClass('olli' + i);
  });
</script>