browser_screenshots

var page = require('webpage').create();
var system = require('system');

page.settings.userAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36";
page.viewportSize = { width: 1280, height: 800};

if (system.args.length === 1) {
    console.log('Usage: browser_screenshots.js <some URL>');
    phantom.exit(1);
} else {
    var url = system.args[1];

    console.log('Loading page > ' + url);
    console.log('...');

    page.open(url, function(status) {
        console.log('Loading ['+ status +'].');
        if ( status === "success" ) {
            var res = page.evaluate(function() {
                function scrollPage(pageHeight, perHeight, interval) {
                    var perHeight = perHeight || 500;
                    var pageHeight = pageHeight || 10000;
                    var step = pageHeight / perHeight;
                    var i = 0;
                    var len = step;
                    var interval = interval || 200;

                    var t = setInterval(function() {
                        if (i > len) {
                            clearInterval(t);
                        }
                        document.body.scrollTop = perHeight * i;
                        i++;
                    }, interval);

                    return interval * len;
                }
                return scrollPage();
            });
            console.log('Capture page.');
            console.log('...');
            setTimeout(function() {
                page.render('result.png');

                console.log('Generating image.');
                phantom.exit();
            }, res + 500);
        }
    });
}