Pagination by twig

shortcode: 
[jsoncontentimporterpro parser=twig id=7 url=https://api.meetup.com/2/open_events?lat=48.1250724792&lon=11.5571479797&key=... urlparam=no]
twig template: 
no of found meetups: {{meta.total_count}}<br>
{% set noonpage = 20 %}
{% set noofpages = (meta.total_count/noonpage) | round(0, 'ceil') %}
show on {{noofpages}} pages:
{% for i in 1..noofpages  %}
{% if i==urlparam.no %}
    <b>this is page: {{urlparam.no}}</b>
{% else  %}
    <a href=?no={{i}}>{{i}}</a>
{% endif %}
{% endfor %}<br>
{% set start = noonpage *(urlparam.no-1)+1 %}
{% set end= noonpage *(urlparam.no) %}
{% if start <1 %}
{% set start = 1 %}
{% set end = noonpage  %}
{% endif %}
show {{start}} to {{end}}
<hr>
{% if meta.total_count==0 %}
 No meetup found
{% endif %}
<ul>
{% for event in results %}
{% if loop.index0< end+1 and loop.index0>start-1 %}
<li>
<b> {{loop.index0}} <a href="{{event.event_url}}" target=_"blank">{{event.name}}</a></b>
<br>
{% set realtime= event.time %}
{% set shortts = realtime |slice(0,10)  %}
{% if shortts|date("H:i")=="00:00" %}
{{shortts|date("d.m.Y") }}
{% else %}
{{shortts|date("d.m.Y, H:i") }} Uhr
{% endif %}
{% if event.venue.city!="" %}
, <a href="https://www.google.de/maps/place/{{event.venue.lat}},{{event.venue.lon}}" target="_blank">{{event.venue.name}}, {{event.venue.address_1}}, {{event.venue.city}}</a>
{% endif %}
{% endif %}
{% endfor %}
</ul>
<hr>
Example in action: no of found meetups: 404
show on 21 pages: 1 2 3 this is page: 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
show 61 to 80
The code-magic behind this (also used at www.digimuc.de):