Passing form values to another page with GET or POST

[jp1to1]

Hello, 

I Would like to pass values from a form to another page. 
I tried by using a capture of {{ content_for_header }} with à GET form input but it only works once as all others inputs done afterwards are ignored.  

I also tried with POST form unsuccessfully.

There's my code : 

{%- capture contentForQuerystring -%}{{ content_for_header }}{%- endcapture -%}
{%- assign pageUrl = contentForQuerystring | split:'"pageurl":"' | last | split:'"' | first | split:'.myshopify.com' | last |
   replace:'\/','/' | 
   replace:'%20',' ' | 
   replace:'\u0026','&'
-%}
{%- unless pageUrl contains "?" -%}{% break %}{%- endunless -%}
{%- assign pageQuerystring = pageUrl | split:'?' | last -%}
{%- assign tag = pageQuerystring | split:'=' | last -%}
{%- assign query_tags = tag | split: "," -%}

{% assign id_input = "1234" | concat: query_tags  %}
 

 Is there any way to do it using a GET or POST method ? 
Thanks for your help ! 

[lspoor · Accepted solution]

Using FormData you could retrieve the desired content and store it in sessionStorage and check for this on the next page.