ngx-pagination
Version:
The simplest solution for pagination in Angular.
103 lines • 11.6 kB
JavaScript
import { EventEmitter } from '@angular/core';
export class PaginationService {
constructor() {
this.change = new EventEmitter();
this.instances = {};
this.DEFAULT_ID = 'DEFAULT_PAGINATION_ID';
}
defaultId() { return this.DEFAULT_ID; }
/**
* Register a PaginationInstance with this service. Returns a
* boolean value signifying whether the instance is new or
* updated (true = new or updated, false = unchanged).
*/
register(instance) {
if (instance.id == null) {
instance.id = this.DEFAULT_ID;
}
if (!this.instances[instance.id]) {
this.instances[instance.id] = instance;
return true;
}
else {
return this.updateInstance(instance);
}
}
/**
* Check each property of the instance and update any that have changed. Return
* true if any changes were made, else return false.
*/
updateInstance(instance) {
let changed = false;
for (let prop in this.instances[instance.id]) {
if (instance[prop] !== this.instances[instance.id][prop]) {
this.instances[instance.id][prop] = instance[prop];
changed = true;
}
}
return changed;
}
/**
* Returns the current page number.
*/
getCurrentPage(id) {
if (this.instances[id]) {
return this.instances[id].currentPage;
}
return 1;
}
/**
* Sets the current page number.
*/
setCurrentPage(id, page) {
if (this.instances[id]) {
let instance = this.instances[id];
let maxPage = Math.ceil(instance.totalItems / instance.itemsPerPage);
if (page <= maxPage && 1 <= page) {
this.instances[id].currentPage = page;
this.change.emit(id);
}
}
}
/**
* Sets the value of instance.totalItems
*/
setTotalItems(id, totalItems) {
if (this.instances[id] && 0 <= totalItems) {
this.instances[id].totalItems = totalItems;
this.change.emit(id);
}
}
/**
* Sets the value of instance.itemsPerPage.
*/
setItemsPerPage(id, itemsPerPage) {
if (this.instances[id]) {
this.instances[id].itemsPerPage = itemsPerPage;
this.change.emit(id);
}
}
/**
* Returns a clone of the pagination instance object matching the id. If no
* id specified, returns the instance corresponding to the default id.
*/
getInstance(id = this.DEFAULT_ID) {
if (this.instances[id]) {
return this.clone(this.instances[id]);
}
return {};
}
/**
* Perform a shallow clone of an object.
*/
clone(obj) {
var target = {};
for (var i in obj) {
if (obj.hasOwnProperty(i)) {
target[i] = obj[i];
}
}
return target;
}
}
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Returns a\r\n     * boolean value signifying whether the instance is new or\r\n     * updated (true = new or updated, false = unchanged).\r\n     */\r\n    public register(instance: PaginationInstance): boolean {\r\n        if (instance.id == null) {\r\n            instance.id = this.DEFAULT_ID;\r\n        }\r\n\r\n        if (!this.instances[instance.id]) {\r\n            this.instances[instance.id] = instance;\r\n            return true;\r\n        } else {\r\n            return this.updateInstance(instance);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Check each property of the instance and update any that have changed. Return\r\n     * true if any changes were made, else return false.\r\n     */\r\n    private updateInstance(instance: PaginationInstance): boolean {\r\n        let changed = false;\r\n        for (let prop in this.instances[instance.id]) {\r\n            if (instance[prop] !== this.instances[instance.id][prop]) {\r\n                this.instances[instance.id][prop] = instance[prop];\r\n                changed = true;\r\n            }\r\n        }\r\n        return changed;\r\n    }\r\n\r\n    /**\r\n     * Returns the current page number.\r\n     */\r\n    public getCurrentPage(id: string): number {\r\n        if (this.instances[id]) {\r\n            return this.instances[id].currentPage;\r\n        }\r\n        return 1;\r\n    }\r\n\r\n    /**\r\n     * Sets the current page number.\r\n     */\r\n    public setCurrentPage(id: string, page: number) {\r\n        if (this.instances[id]) {\r\n            let instance = this.instances[id];\r\n            let maxPage = Math.ceil(instance.totalItems / instance.itemsPerPage);\r\n            if (page <= maxPage && 1 <= page) {\r\n                this.instances[id].currentPage = page;\r\n                this.change.emit(id);\r\n            }\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Sets the value of instance.totalItems\r\n     */\r\n    public setTotalItems(id: string, totalItems: number) {\r\n        if (this.instances[id] && 0 <= totalItems) {\r\n            this.instances[id].totalItems = totalItems;\r\n            this.change.emit(id);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Sets the value of instance.itemsPerPage.\r\n     */\r\n    public setItemsPerPage(id: string, itemsPerPage: number) {\r\n        if (this.instances[id]) {\r\n            this.instances[id].itemsPerPage = itemsPerPage;\r\n            this.change.emit(id);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Returns a clone of the pagination instance object matching the id. If no\r\n     * id specified, returns the instance corresponding to the default id.\r\n     */\r\n    public getInstance(id: string = this.DEFAULT_ID): PaginationInstance {\r\n        if (this.instances[id]) {\r\n            return this.clone(this.instances[id]);\r\n        }\r\n        return {} as PaginationInstance;\r\n    }\r\n\r\n    /**\r\n     * Perform a shallow clone of an object.\r\n     */\r\n    private clone(obj: any): any {\r\n        var target = {};\r\n        for (var i in obj) {\r\n            if (obj.hasOwnProperty(i)) {\r\n                target[i] = obj[i];\r\n            }\r\n        }\r\n        return target;\r\n    }\r\n\r\n}\r\n"]}