RestCollectionView JSONPlaceholder (React)

This sample shows how you can extend the RestCollectionView class to create a custom RestCollectionViewJson class that talks to a JSONPlaceholder source.

This data source does not support server-side paging, sorting, or filtering.

Learn about FlexGrid | Loading Data Documentation | CollectionView API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useState } from 'react'; import { RestCollectionViewJson } from './rest-collection-view-json'; import { CollectionViewNavigator } from '@mescius/wijmo.react.input'; import { FlexGrid } from '@mescius/wijmo.react.grid'; import { FlexGridFilter } from '@mescius/wijmo.react.grid.filter'; import './app.css'; const view = new RestCollectionViewJson('todos', { key: 'id', pageSize: 8 }); function App() { const [update, setUpdate] = useState(0); return (<div className="container-fluid"> <label> Paging{' '} <input id="paging" type="checkbox" checked={view.pageSize > 0} onChange={e => { view.pageSize = view.pageSize == 0 ? 8 : 0; setUpdate(new Date().getTime()); }}> </input> </label> <br /> <CollectionViewNavigator cv={view} byPage={true}/> <FlexGrid allowAddNew={true} allowDelete={true} showMarquee={true} selectionMode='MultiRange' deferResizing={true} alternatingRowStep={0} itemsSource={view} initialized={(s) => s.topLeftCells.columns[0].cellTemplate = ($) => $.text || ($.row.index + 1).toString()}> <FlexGridFilter /> </FlexGrid> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo RestCollectionView JSON Placeholder</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexgrid { max-height: 400px; }
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) { function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); } return new (P || (P = Promise))(function (resolve, reject) { function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); } step((generator = generator.apply(thisArg, _arguments || [])).next()); }); }; import { RestCollectionView } from '@mescius/wijmo.rest'; import { httpRequest, copy, asString, assert } from '@mescius/wijmo'; // regex used to parse dates const _rxDate = /^\d{4}\-\d{2}\-\d{2}T\d{2}\:\d{2}\:\d{2}|\/Date\([\d\-]*?\)/; /** * Class that extends {@link ServerCollectionViewBase} to support JSOnPlaceholder sources. * * For more details on JSOnPlaceholder sources, please see * https://jsonplaceholder.typicode.com/guide/ */ export class RestCollectionViewJson extends RestCollectionView { /** * Initializes a new instance of the {@link RestCollectionViewJson} class. * * @param tableName Name of the table (entity) to retrieve from the service. * @param options JavaScript object containing initialization data (property * values and event handlers) for the {@link ODataCollectionView}. */ constructor(tableName, options) { super(); this._url = 'https://jsonplaceholder.typicode.com/'; this._tbl = asString(tableName); copy(this, options); // this source does not support server-side pagination, sorting, or filtering. this.pageOnServer = false; this.sortOnServer = false; this.filterOnServer = false; } /** * Gets or the name of the key field. * * Key fields are required for update operations (add/remove/delete). */ get key() { return this._key; } set key(value) { this._key = asString(value); } // ** implementation _getWriteUrl(item) { let url = this._url + this._tbl; assert(this.key != null, 'write operations require keys'); return url + '/' + item[this.key]; } _jsonReviver(key, value) { if (typeof value === 'string' && _rxDate.test(value)) { value = value.indexOf('/Date(') == 0 // verbosejson ? new Date(parseInt(value.substr(6))) : new Date(value); } return value; } // ** overrides getItems() { return __awaiter(this, void 0, void 0, function* () { // cancel any pending requests if (this._pendingRequest) { //console.log('aborting pending request'); this._pendingRequest.abort(); } return new Promise(resolve => { let url = this._url + this._tbl; this._pendingRequest = httpRequest(url, { success: (xhr) => __awaiter(this, void 0, void 0, function* () { let arr = JSON.parse(xhr.responseText, this._jsonReviver); resolve(arr); }), error: xhr => this._raiseError(xhr.responseText, false), complete: xhr => this._pendingRequest = null // no pending requests }); }); }); } addItem(item) { return new Promise(resolve => { let url = this._url + this._tbl; let requestHeaders = { 'Content-Type': 'application/json; charset=UTF-8' }; if (this.requestHeaders) { for (let k in this.requestHeaders) { requestHeaders[k] = this.requestHeaders[k]; } } let newItem = {}; for (let k in item) { if (k != this.key) { newItem[k] = item[k]; } } httpRequest(url, { method: 'POST', requestHeaders: requestHeaders, data: newItem, success: xhr => { let newItem = JSON.parse(xhr.responseText, this._jsonReviver); item[this.key] = newItem[this.key]; this.refresh(); }, error: xhr => this._raiseError(xhr.responseText, true) }); }); } patchItem(item) { return new Promise((resolve) => { let url = this._getWriteUrl(item); httpRequest(url, { method: 'PUT', requestHeaders: this.requestHeaders, data: item, success: xhr => resolve(item), error: xhr => this._raiseError(xhr.responseText, true) }); }); } deleteItem(item) { return new Promise(resolve => { let url = this._getWriteUrl(item); httpRequest(url, { method: 'DELETE', requestHeaders: this.requestHeaders, success: xhr => { resolve(item); }, error: xhr => this._raiseError(xhr.responseText, true) }); }); } }
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