querystring.liquid

{%- capture contentForQuerystring -%}{{ content_for_header }}{%- endcapture -%}
{%- assign pageUrl = contentForQuerystring | split:'"pageurl":"' | last | split:'"' | first | split:'.myshopify.com' | last |
   replace:'\/','/' | 
   replace:'%20',' ' | 
   replace:'\u0026','&'
-%}
{%- assign itemShow = '' -%}
{%- for i in (1..1) -%}
  {%- unless pageUrl contains "?" -%}{% break %}{%- endunless -%}
  {%- assign pageQuerystring = pageUrl | split:'?' | last -%}
  {%- assign parts = pageQuerystring | split:'&' -%}
  {%- for part in parts -%}
    {%- assign keyAndValue = part | split:'=' -%}
    {%- if keyAndValue.size > 1 -%}
      {% if keyAndValue[0] == param %}{{keyAndValue[1]}}{% endif %}{%- endif -%}{%- endfor -%}{%- endfor -%}