how does scrapy-splash handle infinite scrolling?

Question

I want to reverse engineering the contents generated by scrolling down in the webpage. The problem is in the url https://www.crowdfunder.com/user/following_page/80159?

Answer 1

To scroll a page you can write a custom rendering script (see http://splash.readthedocs.io/en/stable/scripting-tutorial.html), something like this:

function main(splash)
    local num_scrolls = 10
    local scroll_delay = 1.0

    local scroll_to = splash:jsfunc("window.scrollTo")
    local get_body_height = splash:jsfunc(
        "function() {return document.body.scrollHeight;}"
    )
    assert(splash:go(splash.args.url))
    splash:wait(splash.args.wait)

    for _ = 1, num_scrolls do
        scroll_to(0, get_body_height())
        splash:wait(scroll_delay)
    end        
    return splash:html()
end

To render this script use 'execute' endpoint instead of render.html endpoint:

script = """ """
scrapy_splash.SplashRequest(url, self.parse,
                            endpoint='execute', 
                            args={'wait':2, 'lua_source': script}, ...)