All files / addon/components bootstrap-pagination-nav.js

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import { computed } from '@ember/object';
import Component from '@ember/component';
import layout from '../templates/components/bootstrap-pagination-nav';
 
export default Component.extend({
  tagName: 'nav',
  classNames: ['bootstrap-pagination-nav-component'],
  classNameBindings: ['aria-label'],
  layout: layout,
 
  // Attributes
  'aria-label': 'Page navigation',
  pageNumber: null,
  totalPages: null,
  innerWindowSize: 2,
  outerWindowSize: 1,
 
  // Actions
  moveToPage: null,
 
  _innerPageNumbers: computed('innerWindowSize', 'pageNumber', function() {
    const innerWindowSize = this.get('innerWindowSize');
    const arraySize = innerWindowSize * 2 + 1; // double the length plus the middle "pageNumber"
    const pageNumber = this.get('pageNumber');
 
    return Array.apply(null, Array(arraySize)).map((n, index) => {
      return pageNumber - innerWindowSize + index;
    });
  }),
 
  _outerLeftPageNumbers: computed('outerWindowSize', function() {
    const outerWindowSize = this.get('outerWindowSize');
 
    return Array.apply(null, Array(outerWindowSize)).map((n, index) => {
      return index + 1;
    });
  }),
 
  _outerRightPageNumbers: computed('outerWindowSize', 'totalPages', function() {
    const outerWindowSize = this.get('outerWindowSize');
    const totalPages = this.get('totalPages');
 
    return Array.apply(null, Array(outerWindowSize)).map((n, index) => {
      return totalPages - outerWindowSize + index + 1;
    });
  }),
 
  visibleOuterLeftPageNumbers: computed('_outerLeftPageNumbers', 'totalPages', function() {
    const totalPages = this.get('totalPages');
    const _outerLeftPageNumbers = this.get('_outerLeftPageNumbers');
 
    return _outerLeftPageNumbers.filter((pageNumber) => {
      return pageNumber <= totalPages;
    });
  }),
 
  visibleOuterRightPageNumbers: computed('_outerRightPageNumbers', 'visibleOuterLeftPageNumbers', function() {
    const _outerRightPageNumbers = this.get('_outerRightPageNumbers');
    const visibleOuterLeftPageNumbers = this.get('visibleOuterLeftPageNumbers');
 
    return _outerRightPageNumbers.filter((pageNumber) => {
      return pageNumber >= 1 && visibleOuterLeftPageNumbers.indexOf(pageNumber) === -1;
    });
  }),
 
  visibleInnerPageNumbers: computed(
    '_innerPageNumbers',
    'visibleOuterLeftPageNumbers',
    'visibleOuterRightPageNumbers',
    'pageNumber',
    'totalPages',
    function() {
      const _innerPageNumbers = this.get('_innerPageNumbers');
      const visibleOuterLeftPageNumbers = this.get('visibleOuterLeftPageNumbers');
      const visibleOuterRightPageNumbers = this.get('visibleOuterRightPageNumbers');
      const totalPages = this.get('totalPages');
 
      return _innerPageNumbers.filter((pageNumber) => {
        return visibleOuterLeftPageNumbers.indexOf(pageNumber) === -1 &&
          visibleOuterRightPageNumbers.indexOf(pageNumber) === -1 &&
          pageNumber >= 1 && pageNumber <= totalPages;
      });
    }
  ),
 
  hasLeftGap: computed(
    'pageNumber',
    'innerWindowSize',
    'outerWindowSize',
    function() {
      let innerWindowSize = this.get('innerWindowSize');
      let outerWindowSize = this.get('outerWindowSize');
      let pageNumber = this.get('pageNumber');
      let firstInnerPageNumber = pageNumber - innerWindowSize;
 
      return firstInnerPageNumber > (outerWindowSize + 1);
    }
  ),
 
  hasRightGap: computed(
    'pageNumber',
    'totalPages',
    'innerWindowSize',
    'outerWindowSize',
    function() {
      const innerWindowSize = this.get('innerWindowSize');
      const outerWindowSize = this.get('outerWindowSize');
      const totalPages = this.get('totalPages');
      const pageNumber = this.get('pageNumber');
      const lastInnerPageNumber = pageNumber + innerWindowSize;
      const firstOuterRightPageNumber = totalPages - outerWindowSize;
 
      return lastInnerPageNumber < firstOuterRightPageNumber;
    }
  ),
 
  actions: {
    moveToPreviousPage() {
      const pageNumber = this.get('pageNumber');
 
      if (pageNumber > 1) {
        this.get('moveToPage')(pageNumber - 1);
      }
    },
 
    moveToNextPage() {
      const pageNumber = this.get('pageNumber');
      const totalPages = this.get('totalPages');
 
      if (pageNumber < totalPages) {
        this.get('moveToPage')(pageNumber + 1);
      }
    },
 
    moveToPage(pageNumber) {
      if (pageNumber >= 1) {
        this.get('moveToPage')(pageNumber);
      }
    }
  }
});