MooTools Pseudo Selectors Gone Wild

Over the past few weeks, I've covered how you can create your own pseudo selectors in MooTools. In looking at jQuery's documentation and considering other often-checked element traits, I've created a bunch more useful MooTools pseudo selectors.

The MooTools JavaScript

/* grab "checked" elements */
Selectors.Pseudo.checked = function() {
	return ('input' == this.get('tag') && ('radio' == this.get('type') || 'checkbox' == this.get('type')) && this.checked);
};

/* grab "selected" option elements */
Selectors.Pseudo.selected = function() {
	return ('option' == this.get('tag') && this.selected);
};

/* grab random elements */
/* credit:  http://blog.kassens.net/custom-pseudo-selectors */
Selectors.Pseudo.random = function(probability, local) {
	return Math.random() < (probability || .5).toFloat();
};

/* grab elements with no value */
Selectors.Pseudo.noValue = function() {
	return '' === this.value;
}

/* grab elements with a specific empty attribute */
Selectors.Pseudo.emptyAttribute = function(att) {
	return this.get(att) == '';
}

/* grab disabled elements */
Selectors.Pseudo.disabled = function() {
	return this.disabled;
}

/* grab enabled elements */
Selectors.Pseudo.enabled = function() {
	return !this.disabled;
}

/* grab each type of input */
['text','password','radio','checkbox','submit','image','reset','button','file','hidden'].each(function(type) {
	Selectors.Pseudo.(type) = function() {
		return type == this.get('type') && 'input' == this.get('tag');
	}
});

/* form element ? */
Selectors.Pseudo.input = function() {
	return 'textarea' == this.get('tag') || 'select' == this.get('tag') || 'input' == this.get('tag') || 'button' == this.get('tag');
}

Have any more to add to the pile? Share them!