From d733a5d0f2a9eea957654ad2ceccd05b2224aec0 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Wed, 24 Apr 2019 15:13:33 +0300
Subject: [PATCH] add Back button

---
 .../controllers/address_controller.ex          | 17 +++++++++++++++--
 .../templates/address/index.html.eex           | 18 ++++++++++++------
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/address_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/address_controller.ex
index 730b09eb8f..6f834034cf 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/address_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/address_controller.ex
@@ -21,10 +21,12 @@ defmodule BlockScoutWeb.AddressController do
           nil
 
         next_page_params ->
+          next_params = Map.put(next_page_params, "prev_page_path", cur_page_path(conn, params))
+
           address_path(
             conn,
             :index,
-            next_page_params
+            next_params
           )
       end
 
@@ -34,7 +36,8 @@ defmodule BlockScoutWeb.AddressController do
       address_count: Chain.count_addresses_with_balance_from_cache(),
       exchange_rate: Market.get_exchange_rate(Explorer.coin()) || Token.null(),
       total_supply: Chain.total_supply(),
-      next_page_path: next_page_path
+      next_page_path: next_page_path,
+      prev_page_path: params["prev_page_path"]
     )
   end
 
@@ -49,4 +52,14 @@ defmodule BlockScoutWeb.AddressController do
   def validation_count(%Address{} = address) do
     Chain.address_to_validation_count(address)
   end
+
+  defp cur_page_path(conn, %{"hash" => _hash, "fetched_coin_balance" => _balance} = params) do
+    address_path(
+      conn,
+      :index,
+      params
+    )
+  end
+
+  defp cur_page_path(conn, _), do: address_path(conn, :index)
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address/index.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address/index.html.eex
index cf4e0efb95..535b732f44 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address/index.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address/index.html.eex
@@ -8,8 +8,19 @@
         <%= gettext " addresses of" %>
         <%= Cldr.Number.to_string!(@address_count, format: "#,###") %>
         <%= gettext "total addresses with a balance" %>
-      </p>
 
+        <%= if @next_page_path do %>
+          <a href="<%= "#{@next_page_path}" %>" class="button button-secondary button-small float-right mt-0 ml-1">
+            <%= gettext("Next") %>
+          </a>
+        <% end %>
+        <%= if @prev_page_path do %>
+          <a href="<%= "#{@prev_page_path}" %>" class="button button-secondary button-small float-right mt-0">
+            <%= gettext("Back") %>
+          </a>
+        <% end %>
+      </p>
+      <br>
       <span data-selector="top-addresses-list">
         <%= for {{address, tx_count}, index} <- Enum.with_index(@address_tx_count_pairs, 1) do %>
           <%= render "_tile.html",
@@ -17,11 +28,6 @@
             total_supply: @total_supply, tx_count: tx_count,
             validation_count: validation_count(address) %>
         <% end %>
-        <%= if @next_page_path do %>
-          <a href="<%= "#{@next_page_path}" %>" class="button button-secondary button-small float-right mt-4">
-            <%= gettext("Next") %>
-          </a>
-        <% end %>
       </span>
     </div>
   </div>