Bug 15982 - Serials numbering patterns can be deleted without warning

A JavaScript alert should ask the user to confirm deletion of a serial
numbering pattern. This patch adds this to the template.

To test, apply the patch and go to Serials -> Manage numbering patterns.

- In the list of patterns, click any "Delete" link.
- Verify that a JavaScript alert is triggered.
- Test that cancelling the alert cancels the deletion operation.
- Test that confirming the alert allows the deletion to complete.

Signed-off-by: Nicole C Engard <nengard@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-numberpatterns.tt

@@ -4,6 +4,11 @@
 [% INCLUDE 'calendar.inc' %]
 <script type="text/javascript">
 //<![CDATA[
+
+function confirmDelete() {
+  return confirm(_("Are you sure you want to delete this numbering pattern?"));
+}
+
 [% IF (new or modify) %]
   function testPattern() {
       var frequencyid = $("#frequency").val();
@@ -57,6 +62,11 @@
 function show_blocking_subs() {
     $("#blocking_subs").show();
 }
+$(document).ready(function(){
+    $(".delete_pattern").on("click",function(){
+        return confirmDelete();
+    });
+});
 //]]>
 </script>
 </head>
@@ -318,7 +328,7 @@ function show_blocking_subs() {
                   <td>[% numberpattern.displayorder %]</td>
                   <td>
                     <a href="/cgi-bin/koha/serials/subscription-numberpatterns.pl?op=modify&id=[% numberpattern.id %]">Edit</a> |
-                    <a href="/cgi-bin/koha/serials/subscription-numberpatterns.pl?op=del&id=[% numberpattern.id %]">Delete</a>
+                    <a class="delete_pattern" href="/cgi-bin/koha/serials/subscription-numberpatterns.pl?op=del&id=[% numberpattern.id %]">Delete</a>
                   </td>
                 </tr>
               [% END %]