RestCollectionView JSONPlaceholder (Vue)

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 Vue.

<template> <div className="container-fluid"> <label> Paging <input id="paging" type="checkbox" :checked="view.pageSize > 0" v-on:click="view.pageSize = view.pageSize == 0 ? 8 : 0"> </label> <br /> <wj-collection-view-navigator :cv="view" :byPage="true" /> <wj-flex-grid :allowAddNew="true" :allowDelete="true" :showMarquee="true" :deferResizing="true" :alternatingRowStep="0" selectionMode="MultiRange" :itemsSource="view" :initialized="initGrid"> <wj-flex-grid-filter /> </wj-flex-grid> </div> </template> <script> import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import { createApp } from "vue" import { registerGrid } from "@mescius/wijmo.vue2.grid"; import { registerGridFilter } from "@mescius/wijmo.vue2.grid.filter"; import { registerInput } from "@mescius/wijmo.vue2.input"; import { RestCollectionViewJson } from './rest-collection-view-json'; let App = { name: "App", data: function () { return { view: new RestCollectionViewJson('todos', { key: 'id', pageSize: 8 }) } }, methods: { initGrid: function (s) { s.topLeftCells.columns[0].cellTemplate = function ($) { return $.text || ($.row.index + 1).toString() } } } }; const app = createApp(App); // register all components and directives from Wijmo modules registerInput(app); registerGrid(app); registerGridFilter(app); app.mount('#app'); </script> <style> body { margin-bottom: 36pt; } .wj-flexgrid { max-height: 400px; } </style>
<!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/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app.vue'); </script> </head> <body> <div id="app"> </div> </body> </html>
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 RestCollectionView} to support JSOnPlaceholder sources. * * For more details on JSOnPlaceholder sources, please see * https://jsonplaceholder.typicode.com/guide/ */ export class RestCollectionViewJson extends RestCollectionView { _url = 'https://jsonplaceholder.typicode.com/'; _tbl; _key; _pendingRequest; /** * 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._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 async getItems() { // 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: async xhr => { 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 => { // update keys in the new item, refresh the view 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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