How to pass value from input type in html to a controller in rails -

i beginner in html , ruby on rails. sounds basic question after many attempts not getting how pass value input type not in form controller.

this code -

<div style = "border:1px solid black; padding:1em;">     <%= link_to product.name, product_path(product.id) %>     <br><br>      price : <%= product.price %>      quantity : <input type="text" name='quantity' value = '1' min ='1'/>     <br><br>      <% if session[:cart_id] && @cart_item_ids.include?(product.id) %>     <button><%= link_to 'remove', remove_item_path(:product_id => product.id)     %></button>     <% elsif session[:cart_id] %>      <button><%= link_to 'add cart', add_to_cart_path(:product_id => product.id, :price => product.price, :quantity => 'quantity')     %></button>     <% end%>   <br> </div> 

this controller

class cartscontroller < applicationcontroller    def add_to_cart     byebug     cart_item = cartitem.new     cart_item.product_id = params[:product_id]     cart_item.quantity = 1     cart_item.price = params[:price]     cart_item.cart_id = session[:cart_id]     cart_item.save      product = product.find(params[:product_id])     category = category.find(product.category_id)      redirect_to category_path(:id => product.category_id)   end    def remove_item     cartitem.where(:cart_id =>  session[:cart_id]).where(:product_id => params[:product_id]).first.destroy     product = product.find(params[:product_id])     redirect_to category_path(:id => product.category_id)   end    def view_cart     cart = cart.where(:consumer_id => session[:consumer_id]).first     @cart_items = cartitem.where(:cart_id => cart.id)     render 'show'   end  end 

thanks in advance.

you either need use form post data, or need use asynchronous javascript request post data.