splash-scroll.lua

function scroll_to(splash, x, y)
  local js = string.format(
    "window.scrollTo(%s, %s);", 
    tonumber(x), 
    tonumber(y)
  )
  return splash:runjs(js)
end


function get_doc_height(splash)
  return splash:runjs([[
    Math.max(
        Math.max(document.body.scrollHeight, document.documentElement.scrollHeight),
        Math.max(document.body.offsetHeight, document.documentElement.offsetHeight),
        Math.max(document.body.clientHeight, document.documentElement.clientHeight)
    )
  ]])
end


function scroll_to_bottom(splash)
  local y = get_doc_height(splash)
  return scroll_to(splash, 0, y)
end


function main(splash)

  -- e.g. http://infiniteajaxscroll.com/examples/basic/page1.html
  local url = splash.args.url
  assert(splash:go(url))
  assert(splash:wait(0.5))
  splash:stop()
  
  for i=1,10 do
    scroll_to_bottom(splash)    
    assert(splash:wait(0.2))
  end

  splash:set_viewport("full")

  return {
    html = splash:html(),
    png = splash:png{width=640},
    har = splash:har(),
  }
end

Perfect script! But how can I use "while" instead of "for"? I don't know amount of required iterations. if scrollHeight increased I need to do scrolling again. My code doesn't work.

    local scroll_screen = splash:jsfunc([[
        function () {
            window.scrollTo(0,document.body.scrollHeight);
            return document.body.scrollHeight
        }
    ]])
    local last_scroll_height = 0
    local scroll_height = scroll_screen()
    while last_scroll_height < scroll_height do
        last_scroll_height = scroll_height
        scroll_height = scroll_screen()
        splash:wait(0.2)
    end

excuse me, what's splash:stop() means