Primo import. Funzione Paginazione.

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..b3d54b3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.~*~
\ No newline at end of file

diff --git a/go.mod b/go.mod
new file mode 100644 (file)
index 0000000..0d28a66
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module saetta.ns0.it/zakegg
+
+go 1.18

diff --git a/zakegg.go b/zakegg.go
new file mode 100644 (file)
index 0000000..a0a5589
--- /dev/null
+++ b/zakegg.go
@@ -0,0 +1,95 @@
+package zakegg
+
+import (
+       "fmt"
+       "math"
+)
+
+func Paginazione(start int, rows int, rows_x_page int, url string) string {
+       var page_start int
+       var page_end int
+       var page int
+       var pages int
+
+       if rows_x_page == 0 {
+               return ""
+       }
+
+       ret := ""
+
+       if rows > rows_x_page {
+               ret += `<nav>
+                       <ul class="pagination justify-content-center">`
+
+               pages = rows /rows_x_page
+               if (pages * rows_x_page) < rows {
+                       pages++
+               }
+               if start > 0 {
+                       ret += fmt.Sprintf(`<li class="page-item">
+                                                   <a class="page-link" href="%s" aria-label="Prima" title="Prima">
+                                                   <span aria-hidden="true">&laquo;</span>
+                                                   </a>
+                                                   </li>`, url)
+                       ret += fmt.Sprintf(`<li class="page-item">
+                                                   <a class="page-link" href="%s/%d" aria-label="Precedente" title="Precedente">
+                                                   <span aria-hidden="true">&lsaquo;</span>
+                                                   </a>
+                                                   </li>`, url, start - rows_x_page)
+               } else {
+                       ret += `<li class="page-item disabled">
+                                       <a class="page-link" href="#" aria-label="Prima" title="Prima">
+                                       <span aria-hidden="true">&laquo;</span>
+                                       </a>
+                                       </li>`
+                       ret += `<li class="page-item disabled">
+                                       <a class="page-link" href="#" aria-label="Precedente" title="Predecente">
+                                       <span aria-hidden="true">&lsaquo;</span>
+                                       </a>
+                                       </li>`
+               }
+
+               page_start = int(math.Max(0, float64(int(start / rows_x_page) - 5)))
+               page_end = page_start + 10
+               if page_end > pages {
+                       page_end = pages
+                       page_start = int(math.Max(0, float64(page_end - 10)))
+               }
+               for page = page_start; page < page_end; page++ {
+                       if (start / rows_x_page) == page {
+                               ret += fmt.Sprintf("<li class=\"page-item active\"><a class=\"page-link\" href=\"#\">%d</a></li>\n", page + 1)
+                       } else {
+                               ret += fmt.Sprintf("<li class=\"page-item\"><a class=\"page-link\" href=\"%s/%d\">%d</a></li>\n", url, page * rows_x_page, page + 1)
+                       }
+               }
+
+               if start < int(rows / rows_x_page) * rows_x_page {
+                       ret += fmt.Sprintf(`<li class="page-item">
+                                                   <a class="page-link" href="%s/%d" aria-label="Successiva" title="Successiva">
+                                                   <span aria-hidden="true">&rsaquo;</span>
+                                                   </a>
+                                                   </li>`, url, start + rows_x_page)
+                       ret += fmt.Sprintf(`<li class="page-item">
+                                                   <a class="page-link" href="%s/%d" aria-label="Ultima" title="Ultima">
+                                                   <span aria-hidden="true">&raquo;</span>
+                                                   </a>
+                                                   </li>`, url, (rows / rows_x_page) * rows_x_page)
+               } else {
+                       ret += `<li class="page-item disabled">
+                                       <a class="page-link" href="#" aria-label="Successiva" title="Successiva">
+                                       <span aria-hidden="true">&rsaquo;</span>
+                                       </a>
+                                       </li>`
+                       ret += `<li class="page-item disabled">
+                                       <a class="page-link" href="#" aria-label="Ultima" title="Ultima">
+                                       <span aria-hidden="true">&raquo;</span>
+                                       </a>
+                                       </li>`
+               }
+
+               ret += `</ul>
+                           </nav>`
+       }
+
+       return ret
+}