ngx-pagination
Version:
The simplest solution for pagination in Angular.
208 lines • 25.3 kB
JavaScript
import { Directive, EventEmitter, Input, Output } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "./pagination.service";
/**
* This directive is what powers all pagination controls components, including the default one.
* It exposes an API which is hooked up to the PaginationService to keep the PaginatePipe in sync
* with the pagination controls.
*/
export class PaginationControlsDirective {
constructor(service, changeDetectorRef) {
this.service = service;
this.changeDetectorRef = changeDetectorRef;
this.maxSize = 7;
this.pageChange = new EventEmitter();
this.pageBoundsCorrection = new EventEmitter();
this.pages = [];
this.changeSub = this.service.change
.subscribe(id => {
if (this.id === id) {
this.updatePageLinks();
this.changeDetectorRef.markForCheck();
this.changeDetectorRef.detectChanges();
}
});
}
ngOnInit() {
if (this.id === undefined) {
this.id = this.service.defaultId();
}
this.updatePageLinks();
}
ngOnChanges(changes) {
this.updatePageLinks();
}
ngOnDestroy() {
this.changeSub.unsubscribe();
}
/**
* Go to the previous page
*/
previous() {
this.checkValidId();
this.setCurrent(this.getCurrent() - 1);
}
/**
* Go to the next page
*/
next() {
this.checkValidId();
this.setCurrent(this.getCurrent() + 1);
}
/**
* Returns true if current page is first page
*/
isFirstPage() {
return this.getCurrent() === 1;
}
/**
* Returns true if current page is last page
*/
isLastPage() {
return this.getLastPage() === this.getCurrent();
}
/**
* Set the current page number.
*/
setCurrent(page) {
this.pageChange.emit(page);
}
/**
* Get the current page number.
*/
getCurrent() {
return this.service.getCurrentPage(this.id);
}
/**
* Returns the last page number
*/
getLastPage() {
let inst = this.service.getInstance(this.id);
if (inst.totalItems < 1) {
// when there are 0 or fewer (an error case) items, there are no "pages" as such,
// but it makes sense to consider a single, empty page as the last page.
return 1;
}
return Math.ceil(inst.totalItems / inst.itemsPerPage);
}
getTotalItems() {
return this.service.getInstance(this.id).totalItems;
}
checkValidId() {
if (this.service.getInstance(this.id).id == null) {
console.warn(`PaginationControlsDirective: the specified id "${this.id}" does not match any registered PaginationInstance`);
}
}
/**
* Updates the page links and checks that the current page is valid. Should run whenever the
* PaginationService.change stream emits a value matching the current ID, or when any of the
* input values changes.
*/
updatePageLinks() {
let inst = this.service.getInstance(this.id);
const correctedCurrentPage = this.outOfBoundCorrection(inst);
if (correctedCurrentPage !== inst.currentPage) {
setTimeout(() => {
this.pageBoundsCorrection.emit(correctedCurrentPage);
this.pages = this.createPageArray(inst.currentPage, inst.itemsPerPage, inst.totalItems, this.maxSize);
});
}
else {
this.pages = this.createPageArray(inst.currentPage, inst.itemsPerPage, inst.totalItems, this.maxSize);
}
}
/**
* Checks that the instance.currentPage property is within bounds for the current page range.
* If not, return a correct value for currentPage, or the current value if OK.
*/
outOfBoundCorrection(instance) {
const totalPages = Math.ceil(instance.totalItems / instance.itemsPerPage);
if (totalPages < instance.currentPage && 0 < totalPages) {
return totalPages;
}
else if (instance.currentPage < 1) {
return 1;
}
return instance.currentPage;
}
/**
* Returns an array of Page objects to use in the pagination controls.
*/
createPageArray(currentPage, itemsPerPage, totalItems, paginationRange) {
// paginationRange could be a string if passed from attribute, so cast to number.
paginationRange = +paginationRange;
let pages = [];
// Return 1 as default page number
// Make sense to show 1 instead of empty when there are no items
const totalPages = Math.max(Math.ceil(totalItems / itemsPerPage), 1);
const halfWay = Math.ceil(paginationRange / 2);
const isStart = currentPage <= halfWay;
const isEnd = totalPages - halfWay < currentPage;
const isMiddle = !isStart && !isEnd;
let ellipsesNeeded = paginationRange < totalPages;
let i = 1;
while (i <= totalPages && i <= paginationRange) {
let label;
let pageNumber = this.calculatePageNumber(i, currentPage, paginationRange, totalPages);
let openingEllipsesNeeded = (i === 2 && (isMiddle || isEnd));
let closingEllipsesNeeded = (i === paginationRange - 1 && (isMiddle || isStart));
if (ellipsesNeeded && (openingEllipsesNeeded || closingEllipsesNeeded)) {
label = '...';
}
else {
label = pageNumber;
}
pages.push({
label: label,
value: pageNumber
});
i++;
}
return pages;
}
/**
* Given the position in the sequence of pagination links [i],
* figure out what page number corresponds to that position.
*/
calculatePageNumber(i, currentPage, paginationRange, totalPages) {
let 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;
}
}
}
PaginationControlsDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.3.9", ngImport: i0, type: PaginationControlsDirective, deps: [{ token: i1.PaginationService }, { token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Directive });
PaginationControlsDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "13.3.9", type: PaginationControlsDirective, selector: "pagination-template,[pagination-template]", inputs: { id: "id", maxSize: "maxSize" }, outputs: { pageChange: "pageChange", pageBoundsCorrection: "pageBoundsCorrection" }, exportAs: ["paginationApi"], usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.3.9", ngImport: i0, type: PaginationControlsDirective, decorators: [{
type: Directive,
args: [{
selector: 'pagination-template,[pagination-template]',
exportAs: 'paginationApi'
}]
}], ctorParameters: function () { return [{ type: i1.PaginationService }, { type: i0.ChangeDetectorRef }]; }, propDecorators: { id: [{
type: Input
}], maxSize: [{
type: Input
}], pageChange: [{
type: Output
}], pageBoundsCorrection: [{
type: Output
}] } });
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{ChangeDetectorRef, Directive, EventEmitter, Input, Output} from '@angular/core';\r\nimport {Subscription} from 'rxjs';\r\n\r\nimport {PaginationService} from './pagination.service';\r\nimport {PaginationInstance} from './pagination-instance';\r\n\r\nexport interface Page {\r\n    label: string;\r\n    value: any;\r\n}\r\n\r\n/**\r\n * This directive is what powers all pagination controls components, including the default one.\r\n * It exposes an API which is hooked up to the PaginationService to keep the PaginatePipe in sync\r\n * with the pagination controls.\r\n */\r\n@Directive({\r\n    selector: 'pagination-template,[pagination-template]',\r\n    exportAs: 'paginationApi'\r\n})\r\nexport class PaginationControlsDirective {\r\n    @Input() id: string;\r\n    @Input() maxSize: number = 7;\r\n    @Output() pageChange: EventEmitter<number> = new EventEmitter<number>();\r\n    @Output() pageBoundsCorrection: EventEmitter<number> = new EventEmitter<number>();\r\n    pages: Page[] = [];\r\n\r\n    private changeSub: Subscription;\r\n\r\n    constructor(private service: PaginationService,\r\n                private changeDetectorRef: ChangeDetectorRef) {\r\n        this.changeSub = this.service.change\r\n            .subscribe(id => {\r\n                if (this.id === id) {\r\n                    this.updatePageLinks();\r\n                    this.changeDetectorRef.markForCheck();\r\n                    this.changeDetectorRef.detectChanges();\r\n                }\r\n            });\r\n    }\r\n\r\n    ngOnInit() {\r\n        if (this.id === undefined) {\r\n            this.id = this.service.defaultId();\r\n        }\r\n        this.updatePageLinks();\r\n    }\r\n\r\n    ngOnChanges(changes: any) {\r\n        this.updatePageLinks();\r\n    }\r\n\r\n    ngOnDestroy() {\r\n        this.changeSub.unsubscribe();\r\n    }\r\n\r\n    /**\r\n     * Go to the previous page\r\n     */\r\n    previous() {\r\n        this.checkValidId();\r\n        this.setCurrent(this.getCurrent() - 1);\r\n    }\r\n\r\n    /**\r\n     * Go to the next page\r\n     */\r\n    next() {\r\n        this.checkValidId();\r\n        this.setCurrent(this.getCurrent() + 1);\r\n    }\r\n\r\n    /**\r\n     * Returns true if current page is first page\r\n     */\r\n    isFirstPage(): boolean {\r\n        return this.getCurrent() === 1;\r\n    }\r\n\r\n    /**\r\n     * Returns true if current page is last page\r\n     */\r\n    isLastPage(): boolean {\r\n        return this.getLastPage() === this.getCurrent();\r\n    }\r\n\r\n    /**\r\n     * Set the current page number.\r\n     */\r\n    setCurrent(page: number) {\r\n        this.pageChange.emit(page);\r\n    }\r\n\r\n    /**\r\n     * Get the current page number.\r\n     */\r\n    getCurrent(): number {\r\n        return this.service.getCurrentPage(this.id);\r\n    }\r\n\r\n    /**\r\n     * Returns the last page number\r\n     */\r\n    getLastPage(): number {\r\n        let inst = this.service.getInstance(this.id);\r\n        if (inst.totalItems < 1) {\r\n            // when there are 0 or fewer (an error case) items, there are no \"pages\" as such,\r\n            // but it makes sense to consider a single, empty page as the last page.\r\n            return 1;\r\n        }\r\n        return Math.ceil(inst.totalItems / inst.itemsPerPage);\r\n    }\r\n\r\n    getTotalItems(): number {\r\n        return this.service.getInstance(this.id).totalItems;\r\n    }\r\n\r\n    private checkValidId() {\r\n        if (this.service.getInstance(this.id).id == null) {\r\n            console.warn(`PaginationControlsDirective: the specified id \"${this.id}\" does not match any registered PaginationInstance`);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Updates the page links and checks that the current page is valid. Should run whenever the\r\n     * PaginationService.change stream emits a value matching the current ID, or when any of the\r\n     * input values changes.\r\n     */\r\n    private updatePageLinks() {\r\n        let inst = this.service.getInstance(this.id);\r\n        const correctedCurrentPage = this.outOfBoundCorrection(inst);\r\n\r\n        if (correctedCurrentPage !== inst.currentPage) {\r\n            setTimeout(() => {\r\n                this.pageBoundsCorrection.emit(correctedCurrentPage);\r\n                this.pages = this.createPageArray(inst.currentPage, inst.itemsPerPage, inst.totalItems, this.maxSize);\r\n            });\r\n        } else {\r\n            this.pages = this.createPageArray(inst.currentPage, inst.itemsPerPage, inst.totalItems, this.maxSize);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Checks that the instance.currentPage property is within bounds for the current page range.\r\n     * If not, return a correct value for currentPage, or the current value if OK.\r\n     */\r\n    private outOfBoundCorrection(instance: PaginationInstance): number {\r\n        const totalPages = Math.ceil(instance.totalItems / instance.itemsPerPage);\r\n        if (totalPages < instance.currentPage && 0 < totalPages) {\r\n            return totalPages;\r\n        } else if (instance.currentPage < 1) {\r\n            return 1;\r\n        }\r\n\r\n        return instance.currentPage;\r\n    }\r\n\r\n    /**\r\n     * Returns an array of Page objects to use in the pagination controls.\r\n     */\r\n    private createPageArray(currentPage: number, itemsPerPage: number, totalItems: number, paginationRange: number): Page[] {\r\n        // paginationRange could be a string if passed from attribute, so cast to number.\r\n        paginationRange = +paginationRange;\r\n        let pages = [];\r\n        \r\n        // Return 1 as default page number\r\n        // Make sense to show 1 instead of empty when there are no items\r\n        const totalPages = Math.max(Math.ceil(totalItems / itemsPerPage), 1);\r\n        const halfWay = Math.ceil(paginationRange / 2);\r\n\r\n        const isStart = currentPage <= halfWay;\r\n        const isEnd = totalPages - halfWay < currentPage;\r\n        const isMiddle = !isStart && !isEnd;\r\n\r\n        let ellipsesNeeded = paginationRange < totalPages;\r\n        let i = 1;\r\n\r\n        while (i <= totalPages && i <= paginationRange) {\r\n            let label;\r\n            let pageNumber = this.calculatePageNumber(i, currentPage, paginationRange, totalPages);\r\n            let openingEllipsesNeeded = (i === 2 && (isMiddle || isEnd));\r\n            let closingEllipsesNeeded = (i === paginationRange - 1 && (isMiddle || isStart));\r\n            if (ellipsesNeeded && (openingEllipsesNeeded || closingEllipsesNeeded)) {\r\n                label = '...';\r\n            } else {\r\n                label = pageNumber;\r\n            }\r\n            pages.push({\r\n                label: label,\r\n                value: pageNumber\r\n            });\r\n            i ++;\r\n        }\r\n        return pages;\r\n    }\r\n\r\n    /**\r\n     * Given the position in the sequence of pagination links [i],\r\n     * figure out what page number corresponds to that position.\r\n     */\r\n    private calculatePageNumber(i: number, currentPage: number, paginationRange: number, totalPages: number) {\r\n        let halfWay = Math.ceil(paginationRange / 2);\r\n        if (i === paginationRange) {\r\n            return totalPages;\r\n        } else if (i === 1) {\r\n            return i;\r\n        } else if (paginationRange < totalPages) {\r\n            if (totalPages - halfWay < currentPage) {\r\n                return totalPages - paginationRange + i;\r\n            } else if (halfWay < currentPage) {\r\n                return currentPage - halfWay + i;\r\n            } else {\r\n                return i;\r\n            }\r\n        } else {\r\n            return i;\r\n        }\r\n    }\r\n}\r\n"]}