import scrapy
from scrapy_splash import SplashRequest

class MySpider(scrapy.Spider):
    start_urls = ["http://example.com", "http://example.com/foo"]

    def start_requests(self):
        for url in self.start_urls:
            yield SplashRequest(url, self.parse,
                endpoint='render.html',
                args={'wait': 0.5},
            )

    def parse(self, response):
        # response.body is a result of render.html call; it
        # contains HTML processed by a browser.
        # …

import scrapy
from scrapy_splash import SplashRequest

class MySpider(scrapy.Spider):
    first_page_url = "http://example.com"

    def get_page_contents(self):
        # fetch first page contents
        page_contents = extract_content(response)

        # Select the select control from page
        for element in selected_control:
            click_element(element, extract_content)