/*
 * A pure javascript class for paginating through any number of DOM elements
 * v1.0.2
 *
 * @copyright	Copyright (C) 2011 Simplify Your Web, Inc. All rights reserved.
 * @license	GNU General Public License version 3 or later; see LICENSE.txt
 */
 
function _instanceof(left, right) { if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) { return !!right[Symbol.hasInstance](left); } else { return left instanceof right; } }

function _classCallCheck(instance, Constructor) { if (!_instanceof(instance, Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var purePajinate = /*#__PURE__*/function () {
  "use strict";

  function purePajinate(options) {
    _classCallCheck(this, purePajinate);

    this.config = {
      containerSelector: '.items',
      itemSelector: '.item',
      navigationSelector: '.page_navigation',
      itemsPerPage: 10,
      pageLinksToDisplay: 10,
      startPage: 0,
      wrapAround: false,
      navLabelFirst: 'First',
      navLabelPrev: 'Prev',
      navLabelNext: 'Next',
      navLabelLast: 'Last',
      navOrder: ["first", "prev", "num", "next", "last"],
      showFirstLast: false,
      showPrevNext: true,
      hideOnSmall: false,
      defaultClass: '',
      activeClass: "active",
      disabledClass: "disabled",
      onInit: function onInit() {},
      onPageDisplayed: function onPageDisplayed() {}
    };

    if (typeof options !== "undefined") {
      var userSettings = options;

      for (var attrname in userSettings) {
        if (userSettings[attrname] != undefined) {
          this.config[attrname] = userSettings[attrname];
        }
      }
    }

    this.init();
  }

  _createClass(purePajinate, [{
    key: "init",
    value: function init() {
      this.config.item_container = document.querySelector(this.config.containerSelector);
      this.config.pagination_containers = document.querySelectorAll(this.config.navigationSelector);
      /* Get all the items that are paginated */

      var items = this.config.item_container.querySelectorAll(this.config.itemSelector);

      if (this.config.hideOnSmall && this.config.itemsPerPage >= items.length) {
        return;
      }

      this.current_page = this.config.startPage;

      for (var i = 0; i < items.length; i++) {
        items[i].style.display = 'none';
        items[i].classList.add('hidden');
      }
      /* Calculate the number of pages needed */


      var number_of_pages = Math.ceil(items.length / this.config.itemsPerPage);
      /* Construct the navigation bar */

      var more = '<li class="ellipse more"><span>...</span></li>';
      var less = '<li class="ellipse less"><span>...</span></li>';
      var first = !this.config.showFirstLast ? '' : '<li class="first_link ' + this.config.defaultClass + '"><a href="" onclick="return false;">' + this.config.navLabelFirst + '</a></li>';
      var last = !this.config.showFirstLast ? '' : '<li class="last_link ' + this.config.defaultClass + '"><a href="" onclick="return false;">' + this.config.navLabelLast + '</a></li>';
      var previous = !this.config.showPrevNext ? '' : '<li class="previous_link ' + this.config.defaultClass + '"><a href="" onclick="return false;">' + this.config.navLabelPrev + '</a></li>';
      var next = !this.config.showPrevNext ? '' : '<li class="next_link ' + this.config.defaultClass + '"><a href="" onclick="return false;">' + this.config.navLabelNext + '</a></li>';
      var navigation_html = '<ul>';

      for (var _i = 0; _i < this.config.navOrder.length; _i++) {
        switch (this.config.navOrder[_i]) {
          case "first":
            navigation_html += first;
            break;

          case "last":
            navigation_html += last;
            break;

          case "next":
            navigation_html += next;
            break;

          case "prev":
            navigation_html += previous;
            break;

          case "num":
            if (this.config.showPrevNext) {
              navigation_html += less;
            }

            var current_link = 0;

            while (number_of_pages > current_link) {
              var extra_class = '';

              if (current_link == 0) {
                extra_class = ' first';
              }

              if (current_link == number_of_pages - 1) {
                extra_class = ' last';
              }

              navigation_html += '<li class="page_link' + extra_class + ' ' + this.config.defaultClass + '" longdesc="' + current_link + '"><a href="" onclick="return false;"><span>' + (current_link + 1) + '</span></a></li>';
              current_link++;
            }

            if (this.config.showPrevNext) {
              navigation_html += more;
            }

            break;
        }
      }

      navigation_html += '</ul>';
      /* Iterate through all pagination blocks */

      this.config.pagination_containers.forEach(function (el) {
        el.innerHTML = navigation_html;
        /* Show a subset of page links */

        var page_links = el.querySelectorAll('.page_link');

        for (var _i2 = 0; _i2 < page_links.length; _i2++) {
          if (_i2 >= this.config.pageLinksToDisplay + this.config.startPage || _i2 < this.config.startPage) {
            page_links[_i2].style.display = 'none';
          }
        }
        /* Hide the more/less indicators */


        el.querySelectorAll('.ellipse').forEach(function (ellipses) {
          ellipses.style.display = 'none';
        });
        /* Set the active page link styling */

        if (page_links.length > 0) {
          var first_page = page_links[0];
          first_page.classList.add('active_page');
          first_page.classList.add(this.config.activeClass);
        }

        this.total_page_no_links = page_links.length;
        this.config.pageLinksToDisplay = Math.min(this.config.pageLinksToDisplay, this.total_page_no_links);
        var that = this;
        /* avoids bind(this) in function(e) { }.bind(this) */

        if (this.config.showFirstLast) {
          /* Event handler for 'First' link */
          el.querySelector('.first_link').addEventListener('click', function (e) {
            e.preventDefault();
            that.showFirstPage(el);
          });
          /* Event handler for 'Last' link */

          el.querySelector('.last_link').addEventListener('click', function (e) {
            e.preventDefault();
            that.showLastPage(el);
          });
        }

        if (this.config.showPrevNext) {
          /* Event handler for 'Prev' link */
          el.querySelector('.previous_link').addEventListener('click', function (e) {
            e.preventDefault();
            that.showPrevPage(el);
          });
          /* Event handler for 'Next' link */

          el.querySelector('.next_link').addEventListener('click', function (e) {
            e.preventDefault();
            that.showNextPage(el);
          });
        }
        /* Event handler for each 'Page' link */


        el.querySelectorAll('.page_link').forEach(function (page) {
          page.addEventListener('click', function (e) {
            e.preventDefault();
            that.gotopage(page.getAttribute('longdesc'));
          });
        }, that);
      }, this);
      this.gotopage(parseInt(this.config.startPage));
      /* Set the pagination as ready */

      this.config.item_container.classList.add('loaded');
      /* Call user onInit */

      this.config.onInit.call(this);
    }
  }, {
    key: "showFirstPage",
    value: function showFirstPage(el) {
      this.movePageNumbersRight(el.querySelector('.first_link'), 0);
      this.gotopage(0);
    }
  }, {
    key: "showLastPage",
    value: function showLastPage(el) {
      var lastPage = this.total_page_no_links - 1;
      this.movePageNumbersLeft(el.querySelector('.last_link'), lastPage);
      this.gotopage(lastPage);
    }
  }, {
    key: "showPrevPage",
    value: function showPrevPage(el) {
      var new_page = parseInt(this.current_page) - 1;
      var before_active = el.querySelector('.previous_link').parentNode.querySelector('.active_page').previousElementSibling;

      if (before_active != null && before_active.classList.contains('page_link')) {
        this.movePageNumbersRight(el.querySelector('.previous_link'), new_page);
        this.gotopage(new_page);
      } else if (this.config.wrapAround) {
        this.movePageNumbersLeft(el.querySelector('.previous_link'), this.total_page_no_links - 1);
        this.gotopage(this.total_page_no_links - 1);
      }
    }
  }, {
    key: "showNextPage",
    value: function showNextPage(el) {
      var new_page = parseInt(this.current_page) + 1;
      var after_active = el.querySelector('.next_link').parentNode.querySelector('.active_page').nextElementSibling;

      if (after_active != null && after_active.classList.contains('page_link')) {
        this.movePageNumbersLeft(el.querySelector('.next_link'), new_page);
        this.gotopage(new_page);
      } else if (this.config.wrapAround) {
        this.movePageNumbersRight(el.querySelector('.next_link'), 0);
        this.gotopage(0);
      }
    }
  }, {
    key: "gotopage",
    value: function gotopage(page_num) {
      page_num = parseInt(page_num, 10);
      var ipp = parseInt(this.config.itemsPerPage);
      /* Find the start of the next slice */

      var start_from = page_num * ipp;
      /* Find the end of the next slice */

      var end_on = start_from + ipp;
      /* Hide the current page */

      var items = this.config.item_container.querySelectorAll(this.config.itemSelector);

      var _loop = function _loop(i) {
        if (i >= end_on || i < start_from) {
          items[i].style.display = 'none';
          items[i].classList.remove('visible');
          items[i].classList.add('hidden');
        } else {
          items[i].style.display = 'inline-block';
          setTimeout(function () {
            items[i].classList.remove('hidden');
            items[i].classList.add('visible');
          }, 20);
        }
      };

      for (var i = 0; i < items.length; i++) {
        _loop(i);
      }
      /* Reassign the active class */


      this.config.pagination_containers.forEach(function (el) {
        var page_links = el.querySelectorAll('.page_link');

        for (var _i3 = 0; _i3 < page_links.length; _i3++) {
          if (page_links[_i3].getAttribute('longdesc') == page_num) {
            page_links[_i3].classList.add('active_page');

            page_links[_i3].classList.add(this.config.activeClass);
          } else {
            page_links[_i3].classList.remove('active_page');

            page_links[_i3].classList.remove(this.config.activeClass);
          }
        }
      }, this);
      /* Set the current page */

      this.current_page = page_num;
      /* Hide the more and/or less indicators */

      this.toggleMoreLess();
      /* Add a class to the next or prev links if there are no more pages next or previous to the active page */

      if (!this.config.wrapAround) {
        this.tagNextPrev();
      }

      this.config.onPageDisplayed.call(this, page_num + 1);
    }
  }, {
    key: "movePageNumbersLeft",
    value: function movePageNumbersLeft(e, new_p) {
      var new_page = new_p;
      e.parentNode.querySelectorAll('.page_link').forEach(function (el) {
        if (el.getAttribute('longdesc') == new_page && !el.classList.contains('active_page') && el.style.display == 'none') {
          this.config.pagination_containers.forEach(function (el) {
            var page_links = el.querySelectorAll('.page_link');

            for (var i = 0; i < page_links.length; i++) {
              if (i < new_page + 1 && i >= parseInt(new_page - this.config.pageLinksToDisplay + 1)) {
                page_links[i].style.display = 'inline';
              } else {
                page_links[i].style.display = 'none';
              }
            }
          }, this);
        }
      }, this);
    }
  }, {
    key: "movePageNumbersRight",
    value: function movePageNumbersRight(e, new_p) {
      var new_page = new_p;
      e.parentNode.querySelectorAll('.page_link').forEach(function (el) {
        if (el.getAttribute('longdesc') == new_page && !el.classList.contains('active_page') && el.style.display == 'none') {
          this.config.pagination_containers.forEach(function (el) {
            var page_links = el.querySelectorAll('.page_link');

            for (var i = 0; i < page_links.length; i++) {
              if (i < new_page + parseInt(this.config.pageLinksToDisplay) && i >= new_page) {
                page_links[i].style.display = 'inline';
              } else {
                page_links[i].style.display = 'none';
              }
            }
          }, this);
        }
      }, this);
    }
  }, {
    key: "toggleMoreLess",
    value: function toggleMoreLess() {
      this.config.pagination_containers.forEach(function (container) {
        var more = container.querySelector('.more');

        if (more != null) {
          more.style.display = 'none';

          if (container.querySelector('.page_link.last') && this.isHidden(container.querySelector('.page_link.last'))) {
            more.style.display = 'inline';
          }
        }

        var less = container.querySelector('.less');

        if (less != null) {
          less.style.display = 'none';

          if (container.querySelector('.page_link.first') && this.isHidden(container.querySelector('.page_link.first'))) {
            less.style.display = 'inline';
          }
        }
      }, this);
    }
  }, {
    key: "tagNextPrev",
    value: function tagNextPrev() {
      this.config.pagination_containers.forEach(function (container) {
        var next = container.querySelector('.next_link');
        var previous = container.querySelector('.previous_link');
        var first = container.querySelector('.first_link');
        var last = container.querySelector('.last_link');

        if (container.querySelector('.page_link.last') && container.querySelector('.page_link.last').classList.contains('active_page')) {
          if (next != null) {
            next.classList.add('no_more');
            next.classList.add(this.config.disabledClass);
          }

          if (last != null) {
            last.classList.add('no_more');
            last.classList.add(this.config.disabledClass);
          }
        } else {
          if (next != null) {
            next.classList.remove('no_more');
            next.classList.remove(this.config.disabledClass);
          }

          if (last != null) {
            last.classList.remove('no_more');
            last.classList.remove(this.config.disabledClass);
          }
        }

        if (container.querySelector('.page_link.first') && container.querySelector('.page_link.first').classList.contains('active_page')) {
          if (previous != null) {
            previous.classList.add('no_more');
            previous.classList.add(this.config.disabledClass);
          }

          if (first != null) {
            first.classList.add('no_more');
            first.classList.add(this.config.disabledClass);
          }
        } else {
          if (previous != null) {
            previous.classList.remove('no_more');
            previous.classList.remove(this.config.disabledClass);
          }

          if (first != null) {
            first.classList.remove('no_more');
            first.classList.remove(this.config.disabledClass);
          }
        }
      }, this);
    }
  }, {
    key: "isHidden",
    value: function isHidden(el) {
      var style = window.getComputedStyle(el);
      return style.display === 'none' || style.visibility === 'hidden';
    }
  }]);

  return purePajinate;
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