====== Large book collection Navigation Bar by Decade/Year/Month======
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{{ :reloaded:largebookcollbydecadebyyear.png?nolink&400 |}}

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Enable Views block on book collection you want navigation bar.
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An example: [[http://archive.digibess.eu/islandora/object/fleinaudi%3Aleconomista|here]]
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To edit second level accordion header (i.e. change default background color) add this to style.css:
<WRAP prewrap center>
<code>
.view-grouping-content>.view-grouping>.view-grouping-header {
  background-color: #6aa9be;
}
</code>
</WRAP>
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NOTE: export can include some unused fields that could be removed.

  * **Views Export**
<WRAP prewrap center>
<code>
$view = new view();
$view->name = 'collectionbylustro';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'islandora_solr';
$view->human_name = 'CollectionBYDecadeYearMonth';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Collection by Decade';
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'some';
$handler->display->display_options['pager']['options']['items_per_page'] = '0';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['style_plugin'] = 'views_nested_accordion';
$handler->display->display_options['style_options']['grouping'] = array(
  0 => array(
    'field' => 'php_2',
    'rendered' => 1,
    'rendered_strip' => 0,
  ),
  1 => array(
    'field' => 'php',
    'rendered' => 1,
    'rendered_strip' => 0,
  ),
  2 => array(
    'field' => 'dc.date_dt',
    'rendered' => 1,
    'rendered_strip' => 0,
  ),
);
$handler->display->display_options['style_options']['row_class_special'] = FALSE;
$handler->display->display_options['style_options']['use-grouping-header'] = 1;
$handler->display->display_options['style_options']['collapsible'] = 1;
$handler->display->display_options['style_options']['row-start-open'] = 'none';
$handler->display->display_options['style_options']['animated'] = 'none';
$handler->display->display_options['style_options']['nestedaccordion'] = 1;
$handler->display->display_options['row_plugin'] = 'fields';
/* Field: Islandora Solr: dc.date_dt */
$handler->display->display_options['fields']['dc.date_dt']['id'] = 'dc.date_dt';
$handler->display->display_options['fields']['dc.date_dt']['table'] = 'islandora_solr';
$handler->display->display_options['fields']['dc.date_dt']['field'] = 'dc.date_dt';
$handler->display->display_options['fields']['dc.date_dt']['label'] = '';
$handler->display->display_options['fields']['dc.date_dt']['exclude'] = TRUE;
$handler->display->display_options['fields']['dc.date_dt']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['dc.date_dt']['link_to_object'] = 0;
$handler->display->display_options['fields']['dc.date_dt']['date_format'] = 'custom';
$handler->display->display_options['fields']['dc.date_dt']['custom_date_format'] = 'Y-m';
/* Field: Islandora Solr: dc.title */
$handler->display->display_options['fields']['dc.title']['id'] = 'dc.title';
$handler->display->display_options['fields']['dc.title']['table'] = 'islandora_solr';
$handler->display->display_options['fields']['dc.title']['field'] = 'dc.title';
$handler->display->display_options['fields']['dc.title']['label'] = ' ';
$handler->display->display_options['fields']['dc.title']['element_type'] = 'em';
$handler->display->display_options['fields']['dc.title']['element_label_type'] = 'h5';
$handler->display->display_options['fields']['dc.title']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['dc.title']['link_to_object'] = 1;
/* Field: Global: PHP */
$handler->display->display_options['fields']['php_2']['id'] = 'php_2';
$handler->display->display_options['fields']['php_2']['table'] = 'views';
$handler->display->display_options['fields']['php_2']['field'] = 'php';
$handler->display->display_options['fields']['php_2']['label'] = '';
$handler->display->display_options['fields']['php_2']['exclude'] = TRUE;
$handler->display->display_options['fields']['php_2']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['php_2']['hide_empty'] = TRUE;
$handler->display->display_options['fields']['php_2']['use_php_setup'] = 0;
$handler->display->display_options['fields']['php_2']['php_output'] = '<?php
if (isset($row->{\'dc.date_dt\'})) {
$unit = (int)substr($row->{\'dc.date_dt\'},3,1);
if ($unit < 5) {
$lustro = substr($row->{\'dc.date_dt\'},0,3)."0";
} else {
$lustro = substr($row->{\'dc.date_dt\'},0,3)."5";
}
$lustro = substr($row->{\'dc.date_dt\'},0,3)."0";
print $lustro;
}
?>';
$handler->display->display_options['fields']['php_2']['use_php_click_sortable'] = '0';
$handler->display->display_options['fields']['php_2']['php_click_sortable'] = '';
/* Field: Global: PHP */
$handler->display->display_options['fields']['php']['id'] = 'php';
$handler->display->display_options['fields']['php']['table'] = 'views';
$handler->display->display_options['fields']['php']['field'] = 'php';
$handler->display->display_options['fields']['php']['label'] = '';
$handler->display->display_options['fields']['php']['exclude'] = TRUE;
$handler->display->display_options['fields']['php']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['php']['use_php_setup'] = 0;
$handler->display->display_options['fields']['php']['php_output'] = '<?php
if (isset($row->{\'dc.date_dt\'})) {
$anno = substr($row->{\'dc.date_dt\'},0,4);
print $anno;
}
?>';
$handler->display->display_options['fields']['php']['use_php_click_sortable'] = '0';
$handler->display->display_options['fields']['php']['php_click_sortable'] = '';
/* Sort criterion: Islandora Solr: fgs_label_s */
$handler->display->display_options['sorts']['fgs_label_s']['id'] = 'fgs_label_s';
$handler->display->display_options['sorts']['fgs_label_s']['table'] = 'islandora_solr';
$handler->display->display_options['sorts']['fgs_label_s']['field'] = 'fgs_label_s';
/* Contextual filter: Islandora Solr: RELS_EXT_isMemberOfCollection_uri_s */
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['id'] = 'RELS_EXT_isMemberOfCollection_uri_s';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['table'] = 'islandora_solr';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['field'] = 'RELS_EXT_isMemberOfCollection_uri_s';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['default_action'] = 'default';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['default_argument_type'] = 'php';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['default_argument_options']['code'] = '$current_url = check_plain(request_uri());
$sub=explode("/", $current_url, 4);
$subsub=explode("?", $sub[3], 2);
$fullPID="info:fedora/".urldecode($subsub[0]);
$prova = "info:fedora/fgramsci:sisifo";
return $fullPID;';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['RELS_EXT_isMemberOfCollection_uri_s']['summary_options']['items_per_page'] = '25';
/* Filter criterion: Islandora Solr: RELS_EXT_hasModel_uri_ms */
$handler->display->display_options['filters']['RELS_EXT_hasModel_uri_ms']['id'] = 'RELS_EXT_hasModel_uri_ms';
$handler->display->display_options['filters']['RELS_EXT_hasModel_uri_ms']['table'] = 'islandora_solr';
$handler->display->display_options['filters']['RELS_EXT_hasModel_uri_ms']['field'] = 'RELS_EXT_hasModel_uri_ms';
$handler->display->display_options['filters']['RELS_EXT_hasModel_uri_ms']['value'] = 'info:fedora/islandora:bookCModel';

/* Display: Block */
$handler = $view->new_display('block', 'Block', 'block');
</code>
</WRAP>