Lua Script for Scrapy Splash

script.py

script = """
function main(splash)
    local num_scrolls = 10
    assert(splash:go(splash.args.url))
    local get_dimensions = splash:jsfunc([[
        function () {
            var rect = document.getElementsByClassName('css-vsuiox')[0]
            .getElementsByTagName('button')[0]
            .getClientRects()[0];
            return {"x": rect.left, "y": rect.top};
        }
    ]])
    local scroll_to = splash:jsfunc("window.scrollTo")
    local get_body_height = splash:jsfunc(
        "function() {return document.body.scrollHeight;}"
    )
    -- Loop and click `Show More` button multiple times
    splash:set_viewport_full()
    for i=1, num_scrolls do
        scroll_to(0, get_body_height())
        splash:wait(0.5) -- to avoid errors like: "TypeError: null is not an object"
        local dimensions = get_dimensions()
        splash:mouse_click(dimensions.x, dimensions.y)
    end
    -- Wait split second to allow event to propagate.
    splash:wait(0.1)
    return splash:html()
end
"""

This is brilliant! although, I have a small question.

If document.getElementsByClassName('css-vsuiox')[0] is changed for document.querySelector('button')[0], where it's clicking on a button. Let's say that there are 5 buttons to click, how do I loop sequentially to click on these buttons using your script? It works well if and only if I manually change the index within the squared brackets, as it's written.