kirbycms-individualmultifilterby.php

 <?php 
  
  #Pages have these fields, the can have comma separated values for group, category and option
    
  #  Title: Event1
  #  ----
  #  Group: Group1
  #  ----
  #  Category: Cat2
  #  ----
  #  Option: Option1
  #  ----
  #  Text: Some text
  #  ----

  # Get the tagclouds, we are using three: groups, categories and options
  # You also of course need the tagcloud plugin, but just as it is no hacks or duplicates.
  $items = $pages->find('events');
  
  $groups = tagcloud($items, array('field'   => 'group',
                                   'sort'    => 'name',
                                   'sortdir' => 'asc'));
                                   
  $categories = tagcloud($items, array('field'   => 'category',
                                       'sort'    => 'name',
                                       'sortdir' => 'asc'));
                                       
  $options = tagcloud($items, array('field'   => 'option',
                                    'sort'    => 'name',
                                    'sortdir' => 'asc'));
  
  # Next get the individual unique names from the tagclouds for the form select filter options
  ?>

  <form action="" method="post">
    <h3>Select Group</h3>
    <label for="groups">Select Group:</label>
    <select name="groups">
       <option value="">All</option>
    	<?php foreach($groups as $group): ?>
    	  <option value="<?php echo $group->name()?>"
          <?php if(($_POST) and (strval($group->name()) == $_POST['groups'])) echo ' selected ="selected" ';?>> 
          <?php echo $group->name()?></option>
    	<?php endforeach ?>
  	</select>
    <hr/>
    <label for="categories">Select Category:</label>
  	<select name="categories">
       <option value="">All</option>
    	<?php foreach($categories as $category): ?>
    	  <option value="<?php echo $category->name()?>" 
          <?php if(($_POST) and (strval($category->name()) == $_POST['categories'])) echo ' selected ="selected" ';?>>
          <?php echo $category->name()?>
        </option>
    	<?php endforeach ?>
  	</select>
    <hr/>
    <label for="options">Select Option:</label>
  	<select name="options">
       <option value="">All</option>
    	<?php foreach($options as $option): ?>
        <option value="<?php echo $option->name()?>"
          <?php if(($_POST) and (strval($option->name()) == $_POST['options'])) echo ' selected ="selected" ';?>> 
          <?php echo $option->name()?></option>
    	<?php endforeach ?>
  	</select>
    <br/>
    <button type="submit" id="submit" name="submit" value="Submit" class="btn">Filter</button>
  </form>  

  <hr/>
  

    <h3>Selected filters:</h3>
    <?php 
    # Check to see if anything has been selected, if so then show the filters selected
    if ($_POST){
      echo '<ul><li>Group: '.$_POST['groups'].'</li>';
      echo '<li> Categories: '.$_POST['categories'].'</li>';
      echo '<li> Options: '.$_POST['options'].'</li></ul><hr/><br/>';
      
      # If something is selected we need to set the appropriate filter logic
      $glogic = ($_POST['groups'] == "")     ? '!=' : '*=' ;
      $clogic = ($_POST['categories'] == "") ? '!=' : '*=' ;
      $ologic = ($_POST['options'] == "")    ? '!=' : '*=' ;
      
      $filtered='';
      
      $filtered = $pages->find('events')
                        ->children()
                        ->filterBy('group',    $glogic, $_POST['groups'])
                        ->filterBy('category', $clogic, $_POST['categories'])
                        ->filterBy('option',   $ologic, $_POST['options']);
              
      # And then display pages that match the filters if any - you can use anything in the array
      if ($filtered <>''){   
        echo '<h3>Pages that match filters:</h3>';
        echo '<ul>';
          foreach($filtered as $page) echo '<li> <a href="'.$page->url().'">'.$page->title().'</a></li>';
        echo '</ul>';
      }
      else #No Pages Match Filter
      { 
        echo '<h3>No pages match filters</h3>';
      }
    } 
    else #No Filters Selected
    {
      echo '<p>No filter selected</p>';
    }
  

    ?>