Improved the clicked submit button detection to work on all platforms and...

Improved the clicked submit button detection to work on all platforms and cases where the form has multiple submit buttons.

themes/bootstrap3/js/lightbox.js

@@ -45,6 +45,15 @@ VuFind.lightbox = (function() {
     _modal.modal('show');
     // Attach capturing events
     _modalBody.find('a').on('click', _constrainLink);
+    // Handle submit buttons attached to a form as well as those in a form. Store 
+    // information about which button was clicked here as checking focused button 
+    // doesn't work on all browsers and platforms.
+    _modalBody.find('[type=submit]').click(function() {
+      var form = $(this).prop('form') || $(this).closest('form')[0];
+      $(form.elements).filter('[type=submit]').removeAttr('clicked');
+      $(this).attr('clicked', true);
+    });    
+    
     var forms = _modalBody.find('form');
     for(var i=0;i<forms.length;i++) {
       $(forms[i]).on('submit', _formSubmit);
@@ -141,7 +150,7 @@ VuFind.lightbox = (function() {
     var data = $(form).serializeArray();
     data.push({'name':'layout', 'value':'lightbox'}); // Return in lightbox, please
     // Add submit button information
-    var submit = $(form).find('[type=submit]');
+    var submit = $(form).find('[type=submit][clicked]');
     if (submit.length > 0) {
       submit.attr('disabled', 'disabled');
       var name = submit.attr('name') ? submit.attr('name') : 'submit';