metodos.js

generatePagesArray: function(currentPage, collectionLength, rowsPerPage, paginationRange)
{
    var pages = [];
    var totalPages = Math.ceil(collectionLength / rowsPerPage);
    var halfWay = Math.ceil(paginationRange / 2);
    var position;

    if (currentPage <= halfWay) {
        position = 'start';
    } else if (totalPages - halfWay < currentPage) {
        position = 'end';
    } else {
        position = 'middle';
    }

    var ellipsesNeeded = paginationRange < totalPages;
    var i = 1;
    while (i <= totalPages && i <= paginationRange) {
        var pageNumber = this.calculatePageNumber(i, currentPage, paginationRange, totalPages);
        var openingEllipsesNeeded = (i === 2 && (position === 'middle' || position === 'end'));
        var closingEllipsesNeeded = (i === paginationRange - 1 && (position === 'middle' || position === 'start'));
        if (ellipsesNeeded && (openingEllipsesNeeded || closingEllipsesNeeded)) {
            pages.push('...');
        } else {
            pages.push(pageNumber);
        }
        i ++;
    }
    return pages;
},

calculatePageNumber: function(i, currentPage, paginationRange, totalPages)
{
    var halfWay = Math.ceil(paginationRange/2);
    if (i === paginationRange) {
        return totalPages;
    } else if (i === 1) {
        return i;
    } else if (paginationRange < totalPages) {
        if (totalPages - halfWay < currentPage) {
        return totalPages - paginationRange + i;
    } else if (halfWay < currentPage) {
        return currentPage - halfWay + i;
    } else {
        return i;
    }
    } else {
        return i;
    }
}