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Edit File: segment_selection.hbs

$(function() {
      mailpoet_segment_available_render();
      mailpoet_segment_selection_render();

setInputNames();

// add segment
      $('.mailpoet_segment_add').on('click', function() {
        // add currently selected segment to the selection
        var selected_segment = $('.mailpoet_segment_available :selected');

// add segment to selection
        selected_segments.push({
          id: selected_segment.val(),
          name: selected_segment.text(),
          is_checked: 0
        });

// remove segment from available segments
        selected_segment.remove();

// render selection
        mailpoet_segment_selection_render();

setInputNames();
      });

// remove segment
      $('#mailpoet_segment_selection').on('click', '.remove', function(e) {
        if($('#mailpoet_segment_selection').children().length === 1) {
          return e.preventDefault();
        }
        var element = $(this).parents('li');
        // remove currently selected segment to the selection
        var selected_segment = parseInt(element.data('segment'), 10);

// remove segment from selection
        selected_segments = selected_segments.filter(function(segment) {
          return (parseInt(segment.id, 10) !== selected_segment);
        });

// remove element
        element.remove();

// render available segment
        mailpoet_segment_available_render();

setInputNames();
      });
    });

function setupSortableSegments() {
      // make segment selection sortable
      Sortable.create('mailpoet_segment_selection', {
        handles: $$('#mailpoet_segment_selection .handle'),
         onChange: function(item) {
          setInputNames();
        }
      });
    }

function mailpoet_segment_available_render() {
      // clear available segments
      $('.mailpoet_segment_available').html('');

var selected_segment_ids = selected_segments.map(function(segment) {
        return segment.id;
      });

// display available segments
      $.each(mailpoet_segments, function(i, segment) {
        if($.inArray(segment.id, selected_segment_ids) < 0) {
          $('.mailpoet_segment_available').append(
            '<option value="'+segment.id+'">'+segment.name+'</option>'
          );
        }
      });
      mailpoet_segment_available_toggle();
    }

function mailpoet_segment_selection_render() {
      // segment item template
      var template = Handlebars.compile(
        $('#field_settings_segment_selection_item').html()
      );

// update view
      $('#mailpoet_segment_selection').html(
        template({ segments: selected_segments })
      );

mailpoet_segment_available_toggle();
    }

function mailpoet_segment_available_toggle() {
      // toggle visibility of available segments
      if($('.mailpoet_segment_available option').length === 0) {
        $('#mailpoet_segment_available_container').hide();
      } else {
        $('#mailpoet_segment_available_container').show();
      }
    }

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