jquery-custom-selectors.js

// Custom selectors
$.extend( $.expr[ ":" ], {

	// http://jqueryvalidation.org/blank-selector/
	blank: function( a ) {
		return !$.trim( "" + $( a ).val() );
	},

	// http://jqueryvalidation.org/filled-selector/
	filled: function( a ) {
		var val = $( a ).val();
		return val !== null && !!$.trim( "" + val );
	},

	// http://jqueryvalidation.org/unchecked-selector/
	unchecked: function( a ) {
		return !$( a ).prop( "checked" );
	},

	//http://www.sitepoint.com/make-your-own-custom-jquery-selector/
	inview: function(el) {
        if ($(el).offset().top > $(window).scrollTop() - $(el).outerHeight(true) && $(el).offset().top < $(window).scrollTop() + $(el).outerHeight(true) + $(window).height()) {
            return true;
        }
        return false;
    }

});