scraping when there is on-click

Hi I’m trying to scrape pdf files from this website.
I tried using beautiful soup and also lxml. But I get empty lists. Please let me know where I’m mistaking. There is also one on-click button.

my code.

r= requests.get('http://www.italgiure.giustizia.it/sncass/')
soup = BeautifulSoup(r.text, 'html.parser')

pdf_list = soup.find_all('a')
print(pdf_list)
search_html = html.fromstring(r.text)
page_link = search_html.xpath('//*[@id="contentData"]/div[2]/div[1]/div/h3/a/span[1]/span')
print(page_link)

results:

[<a href="accessibilita.html" style="text-decoration:none;font-size:80%;color:white" tabindex="0">Accessibilità</a>, <a accesskey="r" name="results" onclick="$(this).next().focus();" tabindex="-2" title="contenuto"></a>, <a accesskey="1" name="card" onclick="$(this).next().focus();" tabindex="-2" title="documento"></a>, <a class="text2pdf" href="javascript:void(0)" onclick="toTargetDoc($('.toDocument.pdf',$(this)).attr('data-arg'), this)" style="text-decoration:none;color:#440;" tabindex="0"> <span data-arg="filename" data-role="content" title="pdf"></span>  <span class="chkcontent"><span class="label">Sez.</span> <span class="risultato" data-arg="szdec" data-role="content"></span> <span class="risultato" data-arg="kind" data-role="content"></span><span class="chkcontent"> - <span class="risultato" data-arg="ssz" data-role="content"></span></span><span class="label">,</span> </span> <span data-arg="tipoprov" data-role="content"></span> <span class="chkcontent"><span class="chkcontent"><span class="label">n.</span><span data-arg="numcard" data-role="content"></span></span><span data-arg="numdec" data-role="content" style="display:none"></span><span data-arg="numdep" data-role="content" style="display:none"></span> <span class="chkcontent"><span class="label"> del </span><span data-arg="datdep" data-role="content"></span><span data-arg="ecli" data-role="content" style="font-weight:normal"></span><span data-arg="anno" data-role="content" style="display:none"></span><span class="label">,</span></span> </span> <span class="chkcontent"><span class="label">udienza del</span> <span data-arg="datdec" data-role="content"></span><span class="label">,</span></span> <span class="chkcontent"><span class="label">Presidente </span><span data-arg="presidente" data-role="content"></span> </span> <span class="chkcontent"><span class="label">Relatore </span><span data-arg="relatore" data-role="content"></span> </span> </a>, <a class="text2ocr" href="javascript:void(0)" onclick="toTargetText($('.toDocument.txt',$(this)).attr('data-arg'))" style="text-decoration:none;color:#440;" tabindex="0"> <span data-arg="testoocr" data-role="content" title="testo ocr"></span>  <span data-arg="ocr" data-role="datasubset"> <span data-arg="ocr" data-role="multivaluedcontent">snippet</span> </span> </a>, <a href="http://www.italgiure.giustizia.it" style="color:white;" tabindex="0">ItalgiureWeb</a>] []

In the above results I cannot retrieve the weblinks, which are in the <span class="toDocument pdf" data-arg="/xw...
I also tried giving span class, which is:

pdf_list = soup.find('span', {'class': 'toDocument pdf'})

the html is

<a href="javascript:void(0)" tabindex="0" onclick="toTargetDoc($('.toDocument.pdf',$(this)).attr('data-arg'), this)" style="text-decoration:none;color:#440;" class="text2pdf"> <span data-role="content" data-arg="filename" title="pdf"><span class="toDocument pdf" data-arg="/xway/application/nif/clean/hc.dll%3Fverbo%3Dattach%26db%3Dsnciv%26id%3D./20221107/snciv@s50@a2022@[email protected]"><img class="rowIcon" alt="formato pdf" src="pix/pdf.png"></span></span>&nbsp; <span class="chkcontent"><span class="label">Sez.</span>&nbsp;<span class="risultato" data-role="content" data-arg="szdec">QUINTA</span> <span class="risultato" data-role="content" data-arg="kind">CIVILE</span><span class="label">,</span> </span> <span data-role="content" data-arg="tipoprov">Ordinanza</span> <span class="chkcontent"><span class="chkcontent"><span class="label">n.</span><span data-role="content" data-arg="numcard">32765</span></span><span style="display:none" data-role="content" data-arg="numdec">32765</span><span style="display:none" data-role="content" data-arg="numdep"></span> <span class="chkcontent"><span class="label"> del </span><span data-role="content" data-arg="datdep">07/11/2022</span><span style="font-weight:normal" data-role="content" data-arg="ecli"> (ECLI:IT:CASS:2022:32765CIV)</span><span style="display:none" data-role="content" data-arg="anno">2022</span><span class="label">,</span></span> </span> <span class="chkcontent"><span class="label">udienza del</span>&nbsp;<span data-role="content" data-arg="datdec"><span style="font-weight:normal">19/10/2022</span></span><span class="label">,</span></span> <span class="chkcontent"><span class="label">Presidente </span><span data-role="content" data-arg="presidente">PAOLITTO LIBERATO</span>&nbsp;</span> <span class="chkcontent"><span class="label">Relatore </span><span data-role="content" data-arg="relatore">DELL'ORFANO ANTONELLA</span>&nbsp;</span> </a>

Please let me know how to approach this. Thanks in advance.