How to get url query params via liquid code

[deepen_lau]

How to get url query params via liquid code when developing theme

for example, i have a url : https://my-store.myshopify.com/collections/all?foo=bar

How to get the foo query param using liquid

thanks a lot.

[ZenoPageBuilder]

Hello @deepen_lau 

It is not possible to get query params with Liquid code.

You will need to process it on client side with Js script code.

[deepen_lau]

Thank you very much

[joshcorbett]

It'll take some backwards and ugly liquid code, but saying simply "no" is a ridiculous and false statement.

[ZephyrSoft]

Primero, debe crear el siguiente snippet:
snippets/get-url-query.liquid

{%- capture content_for_query_string -%}{{ content_for_header }}{%- endcapture -%}
{%- liquid
  assign query_key = query_key | default: blank
  assign query_value = blank
  assign page_url = content_for_query_string | split: '"pageurl":"' | last | split: '"' | first | split: request.host | last | replace: '\/', '/' | replace: '%20', ' ' | replace: '\u0026', '&'

  for i in (1..1)
    unless page_url contains '?'
      break
    endunless

    assign query_string = page_url | split: '?' | last
    assign qry_parts = query_string | split: '&'

    for part in qry_parts
      assign key_and_value = part | split: '='
      if key_and_value.size > 1
        if key_and_value[0] == query_key
          assign query_value = key_and_value[1]
        endif
      endif
    endfor
  endfor

  if query_value != blank
    echo query_value | strip | strip_newlines
  endif
-%}

Luego, desde su sección o snippet puede consultar parámetros de la siguiente forma: 

{%- assign query_key= 'foo' -%}

{%- capture query_value -%}
  {%- render 'get-url-query', query_key: query_key' -%}
{%- endcapture -%}

{%- assign query_value = query_value | strip_newlines | strip -%}

<h1>foo = {{ query_value }}</h1>