Bug 31699: Add 'return' option to opac modal login

This patch adds the option to trigger a redirect back to the current
context after successful login using modal logins triggered from various
places in the OPAC.

To make use of this, simply add 'data-return="true"' to the modal trigger link.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 507d48413d)
Signed-off-by: Jacob O'Mara <jacob.omara@ptfs-europe.com>

koha-tmpl/opac-tmpl/bootstrap/js/global.js

@@ -225,6 +225,11 @@ $(document).ready(function(){
 
     $(".loginModal-trigger").on("click",function(e){
         e.preventDefault();
+        var button = $(this);
+        var context = button.data('return');
+        if ( context ) {
+            $('#modalAuth').append('<input type="hidden" name="return" value="'+window.location+'" />');
+        }
         $("#loginModal").modal("show");
     });
     $("#loginModal").on("shown.bs.modal", function(){

opac/opac-user.pl

@@ -424,4 +424,14 @@ if ($search_query) {
     );
 }
 
+# if not an empty string this indicates to return
+# back to the page we triggered the login from
+my $return = $query->param('return');
+if ( $return ) {
+    print $query->redirect(
+        -uri    => $return,
+        -cookie => $cookie,
+    );
+}
+
 output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };