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This a requireJS module helpful for paginating an array data structure. I have used this module for features like infinite scrolling and others.
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// Helper service to paginate an array | |
// Usage: | |
// var bigArray = [1, 2, 3, ..., 1000], | |
// paginatedArray = new ArrayPaginator(bigArray); | |
// paginatedArray.getFirstPage() <-- will always return the first 10 elements in array | |
// paginatedArray.getNextPage() <-- will return next 10 elements in array of the next page | |
/*global define*/ | |
define([], function() { | |
'use strict'; | |
function ArrayPaginator(array) { | |
this._setArray(array); | |
} | |
ArrayPaginator.prototype._totalPages = 0; | |
ArrayPaginator.prototype._currentPage = 0; | |
ArrayPaginator.prototype._perPage = 10; | |
ArrayPaginator.prototype.getFirstPage = function() { | |
this._setFirstPage(); | |
return this._getCurrentPage(); | |
}; | |
ArrayPaginator.prototype.getNextPage = function() { | |
if (this._currentPage <= this._totalPages) { | |
this._currentPage++; | |
return this._getCurrentPage(); | |
} | |
}; | |
ArrayPaginator.prototype._setArray = function(array) { | |
this._array = array; | |
this._setFirstPage(); | |
this._setTotalPages(); | |
}; | |
ArrayPaginator.prototype._setFirstPage = function() { | |
this._currentPage = 0; | |
}; | |
ArrayPaginator.prototype._setTotalPages = function() { | |
this._totalPages = Math.ceil(this._array.length / this._perPage); | |
}; | |
ArrayPaginator.prototype._getCurrentPage = function() { | |
return this._array.slice( | |
this._currentPage * this._perPage, | |
(this._currentPage + 1) * this._perPage | |
); | |
}; | |
return ArrayPaginator; | |
}); |
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