ngx-pagination
Version:
The simplest solution for pagination in Angular.
119 lines • 16.9 kB
JavaScript
import { Pipe } from "@angular/core";
import * as i0 from "@angular/core";
import * as i1 from "./pagination.service";
const LARGE_NUMBER = Number.MAX_SAFE_INTEGER;
export class PaginatePipe {
constructor(service) {
this.service = service;
// store the values from the last time the pipe was invoked
this.state = {};
}
transform(collection, args) {
// When an observable is passed through the AsyncPipe, it will output
// `null` until the subscription resolves. In this case, we want to
// use the cached data from the `state` object to prevent the NgFor
// from flashing empty until the real values arrive.
if (!(collection instanceof Array)) {
let _id = args.id || this.service.defaultId();
if (this.state[_id]) {
return this.state[_id].slice;
}
else {
return collection;
}
}
let serverSideMode = args.totalItems && args.totalItems !== collection.length;
let instance = this.createInstance(collection, args);
let id = instance.id;
let start, end;
let perPage = instance.itemsPerPage;
let emitChange = this.service.register(instance);
if (!serverSideMode && collection instanceof Array) {
perPage = +perPage || LARGE_NUMBER;
start = (instance.currentPage - 1) * perPage;
end = start + perPage;
let isIdentical = this.stateIsIdentical(id, collection, start, end);
if (isIdentical) {
return this.state[id].slice;
}
else {
let slice = collection.slice(start, end);
this.saveState(id, collection, slice, start, end);
this.service.change.emit(id);
return slice;
}
}
else {
if (emitChange) {
this.service.change.emit(id);
}
// save the state for server-side collection to avoid null
// flash as new data loads.
this.saveState(id, collection, collection, start, end);
return collection;
}
}
/**
* Create an PaginationInstance object, using defaults for any optional properties not supplied.
*/
createInstance(collection, config) {
this.checkConfig(config);
return {
id: config.id != null ? config.id : this.service.defaultId(),
itemsPerPage: +config.itemsPerPage || 0,
currentPage: +config.currentPage || 1,
totalItems: +config.totalItems || collection.length
};
}
/**
* Ensure the argument passed to the filter contains the required properties.
*/
checkConfig(config) {
const required = ['itemsPerPage', 'currentPage'];
const missing = required.filter(prop => !(prop in config));
if (0 < missing.length) {
throw new Error(`PaginatePipe: Argument is missing the following required properties: ${missing.join(', ')}`);
}
}
/**
* To avoid returning a brand new array each time the pipe is run, we store the state of the sliced
* array for a given id. This means that the next time the pipe is run on this collection & id, we just
* need to check that the collection, start and end points are all identical, and if so, return the
* last sliced array.
*/
saveState(id, collection, slice, start, end) {
this.state[id] = {
collection,
size: collection.length,
slice,
start,
end
};
}
/**
* For a given id, returns true if the collection, size, start and end values are identical.
*/
stateIsIdentical(id, collection, start, end) {
let state = this.state[id];
if (!state) {
return false;
}
let isMetaDataIdentical = state.size === collection.length &&
state.start === start &&
state.end === end;
if (!isMetaDataIdentical) {
return false;
}
return state.slice.every((element, index) => element === collection[start + index]);
}
}
PaginatePipe.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.3.9", ngImport: i0, type: PaginatePipe, deps: [{ token: i1.PaginationService }], target: i0.ɵɵFactoryTarget.Pipe });
PaginatePipe.ɵpipe = i0.ɵɵngDeclarePipe({ minVersion: "12.0.0", version: "13.3.9", ngImport: i0, type: PaginatePipe, name: "paginate", pure: false });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.3.9", ngImport: i0, type: PaginatePipe, decorators: [{
type: Pipe,
args: [{
name: 'paginate',
pure: false
}]
}], ctorParameters: function () { return [{ type: i1.PaginationService }]; } });
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In this case, we want to\r\n        // use the cached data from the `state` object to prevent the NgFor\r\n        // from flashing empty until the real values arrive.\r\n        if (!(collection instanceof Array)) {\r\n            let _id = args.id || this.service.defaultId();\r\n            if (this.state[_id]) {\r\n                return this.state[_id].slice as U;\r\n            } else {\r\n                return collection;\r\n            }\r\n        }\r\n\r\n        let serverSideMode = args.totalItems && args.totalItems !== collection.length;\r\n        let instance = this.createInstance(collection, args);\r\n        let id = instance.id;\r\n        let start, end;\r\n        let perPage = instance.itemsPerPage;\r\n\r\n        let emitChange = this.service.register(instance);\r\n\r\n        if (!serverSideMode && collection instanceof Array) {\r\n            perPage = +perPage || LARGE_NUMBER;\r\n            start = (instance.currentPage - 1) * perPage;\r\n            end = start + perPage;\r\n\r\n            let isIdentical = this.stateIsIdentical(id, collection, start, end);\r\n            if (isIdentical) {\r\n                return this.state[id].slice as U;\r\n            } else {\r\n                let slice = collection.slice(start, end);\r\n                this.saveState(id, collection, slice, start, end);\r\n                this.service.change.emit(id);\r\n                return slice as U;\r\n            }\r\n        } else {\r\n            if (emitChange) {\r\n                this.service.change.emit(id);\r\n            }\r\n\r\n            // save the state for server-side collection to avoid null\r\n            // flash as new data loads.\r\n            this.saveState(id, collection, collection, start, end);\r\n\r\n            return collection;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Create an PaginationInstance object, using defaults for any optional properties not supplied.\r\n     */\r\n    private createInstance(collection: readonly any[], config: PaginatePipeArgs): PaginationInstance {\r\n        this.checkConfig(config);\r\n\r\n        return {\r\n            id: config.id != null ? config.id : this.service.defaultId(),\r\n            itemsPerPage: +config.itemsPerPage || 0,\r\n            currentPage: +config.currentPage || 1,\r\n            totalItems: +config.totalItems || collection.length\r\n        };\r\n    }\r\n\r\n    /**\r\n     * Ensure the argument passed to the filter contains the required properties.\r\n     */\r\n    private checkConfig(config: PaginatePipeArgs): void {\r\n        const required = ['itemsPerPage', 'currentPage'];\r\n\r\n        const missing = required.filter(prop => !(prop in config));\r\n        if (0 < missing.length) {\r\n            throw new Error(`PaginatePipe: Argument is missing the following required properties: ${missing.join(', ')}`);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * To avoid returning a brand new array each time the pipe is run, we store the state of the sliced\r\n     * array for a given id. This means that the next time the pipe is run on this collection & id, we just\r\n     * need to check that the collection, start and end points are all identical, and if so, return the\r\n     * last sliced array.\r\n     */\r\n    private saveState(id: string, collection: ArrayLike<any>, slice: ArrayLike<any>, start: number, end: number) {\r\n        this.state[id] = {\r\n            collection,\r\n            size: collection.length,\r\n            slice,\r\n            start,\r\n            end\r\n        };\r\n    }\r\n\r\n    /**\r\n     * For a given id, returns true if the collection, size, start and end values are identical.\r\n     */\r\n    private stateIsIdentical(id: string, collection: ArrayLike<any>, start: number, end: number): boolean {\r\n        let state = this.state[id];\r\n        if (!state) {\r\n            return false;\r\n        }\r\n        let isMetaDataIdentical = state.size === collection.length &&\r\n            state.start === start &&\r\n            state.end === end;\r\n\r\n        if(!isMetaDataIdentical) {\r\n            return false;\r\n        }\r\n\r\n        return (state.slice as Array<any>).every((element, index) => element === collection[start + index]);\r\n    }\r\n}\r\n"]}