fundamental-ngx
Version:
SAP Fundamentals, implemented in Angular
128 lines • 12.4 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { Injectable, isDevMode } from '@angular/core';
/** @type {?} */
const DISPLAY_NUM_PAGES = 3;
/**
* Service that is used to retrieve all the pages,
* the number of pages,
* and to validate the pagination object.
*/
export class PaginationService {
/**
* @hidden
*/
constructor() {
/**
* Constant representing the default number of items per page.
*/
this.DEFAULT_ITEMS_PER_PAGE = 10;
/**
* @hidden
*/
this.MORE = -1;
}
/**
* Returns a number array representing the pages of the pagination object.
* @param {?} pagination An object of type *Pagination*.
* @return {?}
*/
getPages(pagination) {
/** @type {?} */
const pages = [];
this.validate(pagination);
/** @type {?} */
const totalPages = this.getTotalPages(pagination);
if (totalPages <= DISPLAY_NUM_PAGES) {
for (let i = 1; i <= totalPages; i++) {
pages.push(i);
}
}
else {
if (pagination.currentPage <= DISPLAY_NUM_PAGES) {
for (let i = 1; i <= DISPLAY_NUM_PAGES; i++) {
pages.push(i);
}
if (totalPages !== DISPLAY_NUM_PAGES + 1) {
pages.push(this.MORE);
}
pages.push(totalPages);
}
else if (pagination.currentPage > totalPages - (DISPLAY_NUM_PAGES - 1)) {
pages.push(1);
if (totalPages !== DISPLAY_NUM_PAGES + 1) {
pages.push(this.MORE);
}
for (let i = totalPages - (DISPLAY_NUM_PAGES - 1); i <= totalPages; i++) {
pages.push(i);
}
}
else {
pages.push(1);
if (totalPages !== DISPLAY_NUM_PAGES + 1) {
pages.push(this.MORE);
}
/** @type {?} */
const buffer = Math.floor(DISPLAY_NUM_PAGES / 2);
for (let i = pagination.currentPage - buffer; i <= pagination.currentPage + buffer; i++) {
pages.push(i);
}
if (totalPages !== DISPLAY_NUM_PAGES + 1) {
pages.push(this.MORE);
}
pages.push(totalPages);
}
}
return pages;
}
/**
* Retrieves the total number of pages.
* @param {?} pagination An object of type *Pagination*.
* @return {?}
*/
getTotalPages(pagination) {
if (pagination.itemsPerPage <= 0) {
pagination.itemsPerPage = this.DEFAULT_ITEMS_PER_PAGE;
}
return Math.ceil(pagination.totalItems / pagination.itemsPerPage);
}
/**
* Provides validation for the pagination object.
* @param {?} pagination An object of type *Pagination*.
* @return {?}
*/
validate(pagination) {
if (!pagination.totalItems && isDevMode()) {
console.warn(`No pages provided in the Pagination object. This warning only appears in development mode.`);
}
if (!pagination.itemsPerPage) {
pagination.itemsPerPage = this.DEFAULT_ITEMS_PER_PAGE;
}
else if (pagination.itemsPerPage < 0 && isDevMode()) {
console.warn(`itemsPerPage must be greater than zero. This warning only appears in development mode.`);
}
if (!pagination.currentPage) {
pagination.currentPage = 1;
}
}
}
PaginationService.decorators = [
{ type: Injectable }
];
/** @nocollapse */
PaginationService.ctorParameters = () => [];
if (false) {
/**
* Constant representing the default number of items per page.
* @type {?}
*/
PaginationService.prototype.DEFAULT_ITEMS_PER_PAGE;
/**
* @hidden
* @type {?}
*/
PaginationService.prototype.MORE;
}
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i <= totalPages; i++) {\n                pages.push(i);\n            }\n        } else {\n            if (pagination.currentPage <= DISPLAY_NUM_PAGES) {\n                for (let i = 1; i <= DISPLAY_NUM_PAGES; i++) {\n                    pages.push(i);\n                }\n                if (totalPages !== DISPLAY_NUM_PAGES + 1) {\n                    pages.push(this.MORE);\n                }\n                pages.push(totalPages);\n            } else if (pagination.currentPage > totalPages - (DISPLAY_NUM_PAGES - 1)) {\n                pages.push(1);\n                if (totalPages !== DISPLAY_NUM_PAGES + 1) {\n                    pages.push(this.MORE);\n                }\n                for (let i = totalPages - (DISPLAY_NUM_PAGES - 1); i <= totalPages; i++) {\n                    pages.push(i);\n                }\n            } else {\n                pages.push(1);\n                if (totalPages !== DISPLAY_NUM_PAGES + 1) {\n                    pages.push(this.MORE);\n                }\n                const buffer = Math.floor(DISPLAY_NUM_PAGES / 2);\n                for (let i = pagination.currentPage - buffer; i <= pagination.currentPage + buffer; i++) {\n                    pages.push(i);\n                }\n                if (totalPages !== DISPLAY_NUM_PAGES + 1) {\n                    pages.push(this.MORE);\n                }\n                pages.push(totalPages);\n            }\n        }\n        return pages;\n    }\n\n    /**\n     * Retrieves the total number of pages.\n     * @param pagination An object of type *Pagination*.\n     */\n    public getTotalPages(pagination: Pagination): number {\n        if (pagination.itemsPerPage <= 0) {\n            pagination.itemsPerPage = this.DEFAULT_ITEMS_PER_PAGE;\n        }\n        return Math.ceil(pagination.totalItems / pagination.itemsPerPage);\n    }\n\n    /**\n     * Provides validation for the pagination object.\n     * @param pagination An object of type *Pagination*.\n     */\n    public validate(pagination: Pagination) {\n        if (!pagination.totalItems && isDevMode()) {\n            console.warn(`No pages provided in the Pagination object. This warning only appears in development mode.`);\n        }\n        if (!pagination.itemsPerPage) {\n            pagination.itemsPerPage = this.DEFAULT_ITEMS_PER_PAGE;\n        } else if (pagination.itemsPerPage < 0 && isDevMode()) {\n            console.warn(`itemsPerPage must be greater than zero. This warning only appears in development mode.`);\n        }\n        if (!pagination.currentPage) {\n            pagination.currentPage = 1;\n        }\n    }\n}\n"]}