Sort book notes

sort.js

<script>
// Dynamic Filter
$(document).ready(function() {
  
  	// Code#001: Set Slug Variables
  	var slug = function(str) {
      var $slug = '';
      var trimmed = $.trim(str);
      $slug = trimmed.replace(/[^a-z0-9-]/gi, '-').
      replace(/-+/g, '-').
      replace(/^-|-$/g, '');
      return $slug.toLowerCase();
    }

	// Code#002: Add Classes to Collection List Items
  	$('#filter-list .w-dyn-item').each(function () {
    									   // The five Category Text Blocks
      	var category1 = slug($(this).find('.category-inlay:nth-child(1)').text());
      	var category2 = slug($(this).find('.category-inlay:nth-child(2)').text());
      	var category3 = slug($(this).find('.category-inlay:nth-child(3)').text());	
      	var category4 = slug($(this).find('.category-inlay:nth-child(4)').text());
      	var category5 = slug($(this).find('.category-inlay:nth-child(5)').text());
      
      	$(this).addClass(category1);
      	$(this).addClass(category2);
      	$(this).addClass(category3);
      	$(this).addClass(category4);
      	$(this).addClass(category5);
	});
  	
  	// Code#003: Show & Hide Items when Filter Navigation is clicked
	$('.filter-item').click(function(){
      
 		var navigationCategory = slug($(this).text());
      
      	$('#filter-list .w-dyn-item').delay(500).css('display', 'none');
        $('.' + navigationCategory).delay(500).css('display', 'block');
      
      	$('.filter-item').removeClass('filter-active');
      	$(this).addClass('filter-active');
        
        $('#category-header').text(navigationCategory.substr(0,1).toUpperCase()+navigationCategory.substr(1));
	});
  
  
  	// Code#004: Show All
  	$('.filter-item:first-child').click(function(){
      
      	$('#filter-list .w-dyn-item').delay(500).css('display', 'block');
	});
  
  	// Code#005: Set Active for Category "All"
  	$('.filter-item:first-child').addClass('filter-active');
  
});
</script>