# src/modules/paging.js | tablefilter v0.5.3 API Document

# src/modules/paging.js

    import {Feature} from '../feature';
    import {createElm, createOpt, createText, elm, removeElm} from '../dom';
    import {isArray, isFn, isNull, EMPTY_FN} from '../types';
    import {addEvt, keyCode, removeEvt} from '../event';
    import {INPUT, SELECT, NONE, ENTER_KEY} from '../const';

    /**
     * Paging UI component
     * @export
     * @class Paging
     * @extends {Feature}
     */
    export class Paging extends Feature {

        /**
         * Creates an instance of Paging
         * @param {TableFilter} tf TableFilter instance
         */
        constructor(tf) {
            super(tf, 'paging');

            // Configuration object
            var f = this.config;

            /**
             * Css class for the paging buttons (previous, next, etc.)
             * @type {String}
             */
            this.btnPageCssClass = f.paging_btn_css_class || 'pgInp';

             /**
             * Main select DOM element
             * @type {DOMElement}
             */
            this.pagingSlc = null;

            /**
             * Results per page select DOM element
             * @type {DOMElement}
             */
            this.resultsPerPageSlc = null;

            /**
             * ID of custom container element
             * @type {String}
             */
            this.pagingTgtId = f.paging_target_id || null;

            /**
             * Number of rows contained in a page
             * @type {Number}
             */
            this.pagingLength = !isNaN(f.paging_length) ? f.paging_length : 10;

            /**
             * ID of custom container element for the results per page selector
             * @type {String}
             */
            this.resultsPerPageTgtId = f.results_per_page_target_id || null;

            /**
             * Css class for the paging select element
             * @type {String}
             */
            this.pgSlcCssClass = f.paging_slc_css_class || 'pgSlc';

            /**
             * Css class for the paging input element
             * @type {String}
             */
            this.pgInpCssClass = f.paging_inp_css_class || 'pgNbInp';

            /**
             * Label and values for the results per page select, example of usage:
             * ['Records: ', [10,25,50,100]]
             * @type {Array}
             */
            this.resultsPerPage = f.results_per_page || null;

            /**
             * Determines if results per page is configured
             * @type {Boolean}
             */
            this.hasResultsPerPage = isArray(this.resultsPerPage);

            /**
             * Css class for the results per page select
             * @type {String}
             */
            this.resultsSlcCssClass = f.results_slc_css_class || 'rspg';

            /**
             * Css class for the label preceding results per page select
             * @type {String}
             */
            this.resultsSpanCssClass = f.results_span_css_class || 'rspgSpan';

            /**
             * Index of the first row of current page
             * @type {Number}
             * @private
             */
            this.startPagingRow = 0;

            /**
             * Total number of pages
             * @type {Number}
             * @private
             */
            this.nbPages = 0;

            /**
             * Current page number
             * @type {Number}
             * @private
             */
            this.currentPageNb = 1;

            /**
             * Next page button text
             * @type {String}
             */
            this.btnNextPageText = f.btn_next_page_text || '>';

            /**
             * Previous page button text
             * @type {String}
             */
            this.btnPrevPageText = f.btn_prev_page_text || '<';

            /**
             * Last page button text
             * @type {String}
             */
            this.btnLastPageText = f.btn_last_page_text || '>|';

            /**
             * First page button text
             * @type {String}
             */
            this.btnFirstPageText = f.btn_first_page_text || '|<';

            /**
             * Next page button HTML
             * @type {String}
             */
            this.btnNextPageHtml = f.btn_next_page_html ||
                (!tf.enableIcons ? null :
                    '<input type="button" value="" class="' + this.btnPageCssClass +
                    ' nextPage" title="Next page" />');

            /**
             * Previous page button HTML
             * @type {String}
             */
            this.btnPrevPageHtml = f.btn_prev_page_html ||
                (!tf.enableIcons ? null :
                    '<input type="button" value="" class="' + this.btnPageCssClass +
                    ' previousPage" title="Previous page" />');

            /**
             * First page button HTML
             * @type {String}
             */
            this.btnFirstPageHtml = f.btn_first_page_html ||
                (!tf.enableIcons ? null :
                    '<input type="button" value="" class="' + this.btnPageCssClass +
                    ' firstPage" title="First page" />');

            /**
             * Last page button HTML
             * @type {String}
             */
            this.btnLastPageHtml = f.btn_last_page_html ||
                (!tf.enableIcons ? null :
                    '<input type="button" value="" class="' + this.btnPageCssClass +
                    ' lastPage" title="Last page" />');

            /**
             * Text preceeding page selector drop-down
             * @type {String}
             */
            this.pageText = f.page_text || ' Page ';

            /**
             * Text after page selector drop-down
             * @type {String}
             */
            this.ofText = f.of_text || ' of ';

            /**
             * Css class for the span containing total number of pages
             * @type {String}
             */
            this.nbPgSpanCssClass = f.nb_pages_css_class || 'nbpg';

            /**
             * Determines if paging buttons are enabled (default: true)
             * @type {Boolean}
             */
            this.hasPagingBtns = f.paging_btns === false ? false : true;

            /**
             * Defines page selector type, two possible values: 'select', 'input'
             * @type {String}
             */
            this.pageSelectorType = f.page_selector_type || SELECT;

            /**
             * Callback fired before the page is changed
             * @type {Function}
             */
            this.onBeforeChangePage = isFn(f.on_before_change_page) ?
                f.on_before_change_page : EMPTY_FN;

            /**
             * Callback fired after the page is changed
             * @type {Function}
             */
            this.onAfterChangePage = isFn(f.on_after_change_page) ?
                f.on_after_change_page : EMPTY_FN;

            /**
             * Label preciding results per page select
             * @type {DOMElement}
             * @private
             */
            this.slcResultsTxt = null;
            /**
             * Span containing next page button
             * @type {DOMElement}
             * @private
             */
            this.btnNextCont = null;
            /**
             * Span containing previous page button
             * @type {DOMElement}
             * @private
             */
            this.btnPrevCont = null;
            /**
             * Span containing last page button
             * @type {DOMElement}
             * @private
             */
            this.btnLastCont = null;
            /**
             * Span containing first page button
             * @type {DOMElement}
             * @private
             */
            this.btnFirstCont = null;
            /**
             * Span for tot nb pages
             * @type {DOMElement}
             * @private
             */
            this.pgCont = null;
            /**
             * Span preceding pages select (contains 'Page')
             * @type {DOMElement}
             * @private
             */
            this.pgBefore = null;
            /**
             * Span following pages select (contains ' of ')
             * @type {DOMElement}
             * @private
             */
            this.pgAfter = null;

            var start_row = tf.refRow;
            var nrows = tf.getRowsNb(true);
            //calculates page nb
            this.nbPages = Math.ceil((nrows - start_row) / this.pagingLength);

            var o = this;
            /**
             * Paging DOM events handlers
             * @type {String}
             * @private
             */
            this.evt = {
                slcIndex() {
                    return (o.pageSelectorType === SELECT) ?
                        o.pagingSlc.options.selectedIndex :
                        parseInt(o.pagingSlc.value, 10) - 1;
                },
                nbOpts() {
                    return (o.pageSelectorType === SELECT) ?
                        parseInt(o.pagingSlc.options.length, 10) - 1 :
                        (o.nbPages - 1);
                },
                next() {
                    var nextIndex = o.evt.slcIndex() < o.evt.nbOpts() ?
                        o.evt.slcIndex() + 1 : 0;
                    o.changePage(nextIndex);
                },
                prev() {
                    var prevIndex = o.evt.slcIndex() > 0 ?
                        o.evt.slcIndex() - 1 : o.evt.nbOpts();
                    o.changePage(prevIndex);
                },
                last() {
                    o.changePage(o.evt.nbOpts());
                },
                first() {
                    o.changePage(0);
                },
                _detectKey(e) {
                    var key = keyCode(e);
                    if (key === ENTER_KEY) {
                        if (tf.sorted) {
                            tf.filter();
                            o.changePage(o.evt.slcIndex());
                        } else {
                            o.changePage();
                        }
                        this.blur();
                    }
                },
                slcPagesChange: null,
                nextEvt: null,
                prevEvt: null,
                lastEvt: null,
                firstEvt: null
            };
        }

        /**
         * Initialize DOM elements
         */
        init() {
            var slcPages;
            var tf = this.tf;
            var evt = this.evt;

            if (this.initialized) {
                return;
            }

            // Check resultsPerPage is in expected format and initialise the
            // results per page component
            if (this.hasResultsPerPage) {
                if (this.resultsPerPage.length < 2) {
                    this.hasResultsPerPage = false;
                } else {
                    this.pagingLength = this.resultsPerPage[1][0];
                    this.setResultsPerPage();
                }
            }

            evt.slcPagesChange = (event) => {
                var slc = event.target;
                this.changePage(slc.selectedIndex);
            };

            // Paging drop-down list selector
            if (this.pageSelectorType === SELECT) {
                slcPages = createElm(SELECT);
                slcPages.className = this.pgSlcCssClass;
                addEvt(slcPages, 'change', evt.slcPagesChange);
            }

            // Paging input selector
            if (this.pageSelectorType === INPUT) {
                slcPages = createElm(INPUT, ['value', this.currentPageNb]);
                slcPages.className = this.pgInpCssClass;
                addEvt(slcPages, 'keypress', evt._detectKey);
            }

            // btns containers
            var btnNextSpan = createElm('span');
            var btnPrevSpan = createElm('span');
            var btnLastSpan = createElm('span');
            var btnFirstSpan = createElm('span');

            if (this.hasPagingBtns) {
                // Next button
                if (!this.btnNextPageHtml) {
                    var btnNext = createElm(INPUT,
                        ['type', 'button'],
                        ['value', this.btnNextPageText],
                        ['title', 'Next']
                    );
                    btnNext.className = this.btnPageCssClass;
                    addEvt(btnNext, 'click', evt.next);
                    btnNextSpan.appendChild(btnNext);
                } else {
                    btnNextSpan.innerHTML = this.btnNextPageHtml;
                    addEvt(btnNextSpan, 'click', evt.next);
                }
                // Previous button
                if (!this.btnPrevPageHtml) {
                    var btnPrev = createElm(INPUT,
                        ['type', 'button'],
                        ['value', this.btnPrevPageText],
                        ['title', 'Previous']
                    );
                    btnPrev.className = this.btnPageCssClass;
                    addEvt(btnPrev, 'click', evt.prev);
                    btnPrevSpan.appendChild(btnPrev);
                } else {
                    btnPrevSpan.innerHTML = this.btnPrevPageHtml;
                    addEvt(btnPrevSpan, 'click', evt.prev);
                }
                // Last button
                if (!this.btnLastPageHtml) {
                    var btnLast = createElm(INPUT,
                        ['type', 'button'],
                        ['value', this.btnLastPageText],
                        ['title', 'Last']
                    );
                    btnLast.className = this.btnPageCssClass;
                    addEvt(btnLast, 'click', evt.last);
                    btnLastSpan.appendChild(btnLast);
                } else {
                    btnLastSpan.innerHTML = this.btnLastPageHtml;
                    addEvt(btnLastSpan, 'click', evt.last);
                }
                // First button
                if (!this.btnFirstPageHtml) {
                    var btnFirst = createElm(INPUT,
                        ['type', 'button'],
                        ['value', this.btnFirstPageText],
                        ['title', 'First']
                    );
                    btnFirst.className = this.btnPageCssClass;
                    addEvt(btnFirst, 'click', evt.first);
                    btnFirstSpan.appendChild(btnFirst);
                } else {
                    btnFirstSpan.innerHTML = this.btnFirstPageHtml;
                    addEvt(btnFirstSpan, 'click', evt.first);
                }
            }

            // paging elements (buttons+drop-down list) are added to defined element
            if (!this.pagingTgtId) {
                tf.setToolbar();
            }
            var targetEl = !this.pagingTgtId ? tf.mDiv : elm(this.pagingTgtId);
            targetEl.appendChild(btnFirstSpan);
            targetEl.appendChild(btnPrevSpan);

            var pgBeforeSpan = createElm('span');
            pgBeforeSpan.appendChild(createText(this.pageText));
            pgBeforeSpan.className = this.nbPgSpanCssClass;
            targetEl.appendChild(pgBeforeSpan);
            targetEl.appendChild(slcPages);
            var pgAfterSpan = createElm('span');
            pgAfterSpan.appendChild(createText(this.ofText));
            pgAfterSpan.className = this.nbPgSpanCssClass;
            targetEl.appendChild(pgAfterSpan);
            var pgSpan = createElm('span');
            pgSpan.className = this.nbPgSpanCssClass;
            pgSpan.appendChild(createText(' ' + this.nbPages + ' '));
            targetEl.appendChild(pgSpan);
            targetEl.appendChild(btnNextSpan);
            targetEl.appendChild(btnLastSpan);

            this.btnNextCont = btnNextSpan;
            this.btnPrevCont = btnPrevSpan;
            this.btnLastCont = btnLastSpan;
            this.btnFirstCont = btnFirstSpan;
            this.pgCont = pgSpan;
            this.pgBefore = pgBeforeSpan;
            this.pgAfter = pgAfterSpan;
            this.pagingSlc = slcPages;

            this.setPagingInfo();

            if (!tf.fltGrid) {
                tf.validateAllRows();
                this.setPagingInfo(tf.validRowsIndex);
            }

            this.emitter.on(['after-filtering'], () => this.resetPagingInfo());
            this.emitter.on(['change-page'],
                (tf, pageNumber) => this.setPage(pageNumber));
            this.emitter.on(['change-page-results'],
                (tf, pageLength) => this.changeResultsPerPage(pageLength));

            /** @inherited */
            this.initialized = true;
        }

        /**
         * Reset paging when filters are already instantiated
         * @param {Boolean} filterTable Execute filtering once paging instanciated
         */
        reset(filterTable = false) {
            var tf = this.tf;
            if (this.isEnabled()) {
                return;
            }
            this.enable();
            this.init();

            if (filterTable) {
                tf.filter();
            }
        }

        /**
         * Reset paging info from scratch after a filtering process
         */
        resetPagingInfo() {
            this.startPagingRow = 0;
            this.currentPageNb = 1;
            this.setPagingInfo(this.tf.validRowsIndex);
        }

        /**
         * Calculate number of pages based on valid rows
         * Refresh paging select according to number of pages
         * @param {Array} validRows Collection of valid rows
         */
        setPagingInfo(validRows) {
            var tf = this.tf;
            var mdiv = !this.pagingTgtId ? tf.mDiv : elm(this.pagingTgtId);

            //store valid rows indexes
            tf.validRowsIndex = validRows || tf.getValidRows(true);

            //calculate nb of pages
            this.nbPages = Math.ceil(tf.validRowsIndex.length / this.pagingLength);
            //refresh page nb span
            this.pgCont.innerHTML = this.nbPages;
            //select clearing shortcut
            if (this.pageSelectorType === SELECT) {
                this.pagingSlc.innerHTML = '';
            }

            if (this.nbPages > 0) {
                mdiv.style.visibility = 'visible';
                if (this.pageSelectorType === SELECT) {
                    for (var z = 0; z < this.nbPages; z++) {
                        var opt = createOpt(z + 1, z * this.pagingLength, false);
                        this.pagingSlc.options[z] = opt;
                    }
                } else {
                    //input type
                    this.pagingSlc.value = this.currentPageNb;
                }

            } else {
                /*** if no results paging select and buttons are hidden ***/
                mdiv.style.visibility = 'hidden';
            }
            this.groupByPage(tf.validRowsIndex);
        }

        /**
         * Group table rows by page and display valid rows
         * @param  {Array} validRows Collection of valid rows
         */
        groupByPage(validRows) {
            var tf = this.tf;
            var rows = tf.tbl.rows;
            var startPagingRow = parseInt(this.startPagingRow, 10);
            var endPagingRow = startPagingRow + parseInt(this.pagingLength, 10);

            //store valid rows indexes
            if (validRows) {
                tf.validRowsIndex = validRows;
            }

            //this loop shows valid rows of current page
            for (var h = 0, len = tf.getValidRowsNb(true); h < len; h++) {
                var validRowIdx = tf.validRowsIndex[h];
                var r = rows[validRowIdx];
                var isRowValid = r.getAttribute('validRow');
                var rowDisplayed = false;

                if (h >= startPagingRow && h < endPagingRow) {
                    if (isNull(isRowValid) || Boolean(isRowValid === 'true')) {
                        r.style.display = '';
                        rowDisplayed = true;
                    }
                } else {
                    r.style.display = NONE;
                }
                this.emitter.emit('row-paged', tf, validRowIdx, h, rowDisplayed);
            }

            // broadcast grouping by page
            this.emitter.emit('grouped-by-page', tf, this);
        }

        /**
         * Return the current page number
         * @return {Number} Page number
         */
        getPage() {
            return this.currentPageNb;
        }

        /**
         * Show page defined by passed argument (string or number):
         * @param {String}/{Number} cmd possible string values: 'next',
         *   'previous', 'last', 'first' or page number as per param
         */
        setPage(cmd) {
            var tf = this.tf;
            if (!tf.isInitialized() || !this.isEnabled()) {
                return;
            }
            var btnEvt = this.evt,
                cmdtype = typeof cmd;
            if (cmdtype === 'string') {
                switch (cmd.toLowerCase()) {
                    case 'next':
                        btnEvt.next();
                        break;
                    case 'previous':
                        btnEvt.prev();
                        break;
                    case 'last':
                        btnEvt.last();
                        break;
                    case 'first':
                        btnEvt.first();
                        break;
                    default:
                        btnEvt.next();
                        break;
                }
            }
            else if (cmdtype === 'number') {
                this.changePage(cmd - 1);
            }
        }

        /**
         * Generates UI elements for the number of results per page drop-down
         */
        setResultsPerPage() {
            var tf = this.tf;
            var evt = this.evt;

            if (this.resultsPerPageSlc || !this.resultsPerPage) {
                return;
            }

            evt.slcResultsChange = (ev) => {
                this.onChangeResultsPerPage();
                ev.target.blur();
            };

            var slcR = createElm(SELECT);
            slcR.className = this.resultsSlcCssClass;
            var slcRText = this.resultsPerPage[0],
                slcROpts = this.resultsPerPage[1];
            var slcRSpan = createElm('span');
            slcRSpan.className = this.resultsSpanCssClass;

            // results per page select is added to external element
            if (!this.resultsPerPageTgtId) {
                tf.setToolbar();
            }
            var targetEl = !this.resultsPerPageTgtId ?
                tf.rDiv : elm(this.resultsPerPageTgtId);
            slcRSpan.appendChild(createText(slcRText));

            var help = tf.feature('help');
            if (help && help.btn) {
                help.btn.parentNode.insertBefore(slcRSpan, help.btn);
                help.btn.parentNode.insertBefore(slcR, help.btn);
            } else {
                targetEl.appendChild(slcRSpan);
                targetEl.appendChild(slcR);
            }

            for (var r = 0; r < slcROpts.length; r++) {
                var currOpt = new Option(slcROpts[r], slcROpts[r], false, false);
                slcR.options[r] = currOpt;
            }
            addEvt(slcR, 'change', evt.slcResultsChange);
            this.slcResultsTxt = slcRSpan;
            this.resultsPerPageSlc = slcR;
        }

        /**
         * Remove number of results per page UI elements
         */
        removeResultsPerPage() {
            var tf = this.tf;
            if (!tf.isInitialized() || !this.resultsPerPageSlc ||
                !this.resultsPerPage) {
                return;
            }
            if (this.resultsPerPageSlc) {
                removeElm(this.resultsPerPageSlc);
            }
            if (this.slcResultsTxt) {
                removeElm(this.slcResultsTxt);
            }
            this.resultsPerPageSlc = null;
            this.slcResultsTxt = null;
        }

        /**
         * Change the page based on passed index
         * @param {Number} index Index of the page (0-n)
         */
        changePage(index) {
            var tf = this.tf;

            if (!this.isEnabled()) {
                return;
            }

            this.emitter.emit('before-page-change', tf, (index + 1));

            if (index === null) {
                index = this.pageSelectorType === SELECT ?
                    this.pagingSlc.options.selectedIndex : this.pagingSlc.value - 1;
            }
            if (index >= 0 && index <= (this.nbPages - 1)) {
                this.onBeforeChangePage(this, (index + 1));

                this.currentPageNb = parseInt(index, 10) + 1;
                if (this.pageSelectorType === SELECT) {
                    this.pagingSlc.options[index].selected = true;
                } else {
                    this.pagingSlc.value = this.currentPageNb;
                }

                this.startPagingRow = (this.pageSelectorType === SELECT) ?
                    this.pagingSlc.value : (index * this.pagingLength);

                this.groupByPage();

                this.onAfterChangePage(this, (index + 1));
            }

            this.emitter.emit('after-page-change', tf, (index + 1));
        }

        /**
         * Change the number of results per page based on passed value
         * @param {String} val The number of results per page
         */
        changeResultsPerPage(val) {
            if (!this.isEnabled() || isNaN(val)) {
                return;
            }

            this.resultsPerPageSlc.value = val;
            this.onChangeResultsPerPage();
        }

        /**
         * Change rows according to page results drop-down
         */
        onChangeResultsPerPage() {
            var tf = this.tf;

            if (!this.isEnabled()) {
                return;
            }

            this.emitter.emit('before-page-length-change', tf);

            var slcR = this.resultsPerPageSlc;
            var slcIndex = slcR.selectedIndex;
            var slcPagesSelIndex = (this.pageSelectorType === SELECT) ?
                this.pagingSlc.selectedIndex :
                parseInt(this.pagingSlc.value - 1, 10);
            this.pagingLength = parseInt(slcR.options[slcIndex].value, 10);
            this.startPagingRow = this.pagingLength * slcPagesSelIndex;

            if (!isNaN(this.pagingLength)) {
                if (this.startPagingRow >= tf.nbFilterableRows) {
                    this.startPagingRow = (tf.nbFilterableRows - this.pagingLength);
                }
                this.setPagingInfo();

                if (this.pageSelectorType === SELECT) {
                    var slcIdx =
                        (this.pagingSlc.options.length - 1 <= slcPagesSelIndex) ?
                            (this.pagingSlc.options.length - 1) : slcPagesSelIndex;
                    this.pagingSlc.options[slcIdx].selected = true;
                }
            }

            this.emitter.emit('after-page-length-change', tf, this.pagingLength);
        }

        /**
         * Re-set page nb at page re-load
         */
        resetPage() {
            var tf = this.tf;
            if (!this.isEnabled()) {
                return;
            }
            this.emitter.emit('before-reset-page', tf);
            var pgNb = tf.feature('store').getPageNb();
            if (pgNb !== '') {
                this.changePage((pgNb - 1));
            }
            this.emitter.emit('after-reset-page', tf, pgNb);
        }

        /**
         * Re-set page length value at page re-load
         */
        resetPageLength() {
            var tf = this.tf;
            if (!this.isEnabled()) {
                return;
            }
            this.emitter.emit('before-reset-page-length', tf);
            var pglenIndex = tf.feature('store').getPageLength();

            if (pglenIndex !== '') {
                this.resultsPerPageSlc.options[pglenIndex].selected = true;
                this.changeResultsPerPage();
            }
            this.emitter.emit('after-reset-page-length', tf, pglenIndex);
        }

        /**
         * Remove paging feature
         */
        destroy() {
            if (!this.initialized) {
                return;
            }

            var evt = this.evt;

            if (this.pagingSlc) {
                if (this.pageSelectorType === SELECT) {
                    removeEvt(this.pagingSlc, 'change', evt.slcPagesChange);
                }
                else if (this.pageSelectorType === INPUT) {
                    removeEvt(this.pagingSlc, 'keypress', evt._detectKey);
                }
                removeElm(this.pagingSlc);
            }

            if (this.btnNextCont) {
                removeEvt(this.btnNextCont, 'click', evt.next);
                removeElm(this.btnNextCont);
                this.btnNextCont = null;
            }

            if (this.btnPrevCont) {
                removeEvt(this.btnPrevCont, 'click', evt.prev);
                removeElm(this.btnPrevCont);
                this.btnPrevCont = null;
            }

            if (this.btnLastCont) {
                removeEvt(this.btnLastCont, 'click', evt.last);
                removeElm(this.btnLastCont);
                this.btnLastCont = null;
            }

            if (this.btnFirstCont) {
                removeEvt(this.btnFirstCont, 'click', evt.first);
                removeElm(this.btnFirstCont);
                this.btnFirstCont = null;
            }

            if (this.pgBefore) {
                removeElm(this.pgBefore);
                this.pgBefore = null;
            }

            if (this.pgAfter) {
                removeElm(this.pgAfter);
                this.pgAfter = null;
            }

            if (this.pgCont) {
                removeElm(this.pgCont);
                this.pgCont = null;
            }

            if (this.hasResultsPerPage) {
                this.removeResultsPerPage();
            }

            this.emitter.off(['after-filtering'], () => this.resetPagingInfo());
            this.emitter.off(['change-page'],
                (tf, pageNumber) => this.setPage(pageNumber));
            this.emitter.off(['change-page-results'],
                (tf, pageLength) => this.changeResultsPerPage(pageLength));

            this.pagingSlc = null;
            this.nbPages = 0;
            this.disable();
            this.initialized = false;
        }
    }