Masonry responsive layout technique -

masonry-responsive.js

// As used by Codroprs 
// http://tympanus.net/codrops/collective/collective-36/

jQuery(document).ready(function($) {
    var CollManag = (function() {
        var $ctCollContainer = $('#ct-coll-container'),
        collCnt = 1,
        init = function() {
            changeColCnt();
            initEvents();
            initPlugins();
        },
        changeColCnt = function() {
            var w_w = $(window).width();
            if( w_w <= 600 ) n = 1;
            else if( w_w <= 768 ) n = 2;
            else n = 3;
        },
        initEvents = function() {
            $(window).on( 'smartresize.CollManag', function( event ) {
                changeColCnt();
            });
        },
        initPlugins = function() {
            $ctCollContainer.imagesLoaded( function(){
                $ctCollContainer.masonry({
                    itemSelector : '.ct-coll-item',
                    columnWidth : function( containerWidth ) {
                        return containerWidth / n;
                    },
                    isAnimated : true,
                    animationOptions: {
                        duration: 400
                    }
                });
            });
            $ctCollContainer.colladjust();
            $ctCollContainer.find('div.ct-coll-item-multi').collslider();
        };
        return { init: init };
    })();
    CollManag.init();
}); 

The Basic idea seems to be to add a columnselector which finds out how many columns can be set. Second step is to use the smartresize event in the function. Third step is to call masonry with the "dynamic" width of columns.