JAVASCRIPT

trigger window resize

// Cross-browser solution (IE support)
var resizeEvent = window.document.createEvent('UIEvents'); 
resizeEvent.initUIEvent('resize', true, false, window, 0); 
window.dispatchEvent(resizeEvent);

run function on page resize javascript

 //function for screen resize
 function screen_resize() {
        var h = parseInt(window.innerHeight);
        var w = parseInt(window.innerWidth);

        if(w <= 500) {
            //max-width 500px
            // actions here...
            red();
        } else if(w > 500 && w <=850) {
            //max-width 850px
            // actions here...
            orange();
        } else {
            // 850px and beyond
            // actions here...
            green();
        }

    }

on window resize and on page load

// Bind to the resize event of the window object
$(window).on("resize", function () {
    // Set .right's width to the window width minus 480 pixels
    $(".content .right").width( $(this).width() - 480 );
// Invoke the resize event immediately
}).resize();