Demos
Wijmo(Angular)
CollectionView
REST CollectionView
RestAPI
Overview

RestCollectionView RestAPI (Angular)

This sample shows how you can extend the RestCollectionView class to create a custom RestCollectionViewExt class that talks to Mescius Demo Service's Grouping and Pagination RestAPI.

The RestCollectionViewExt class supports server-based pagination/virtualization along with server based sorting, filtering.

You can check a sample implementation with server and client code Wijmo-Rest-CollectionView-Sample

Learn about FlexGrid | Loading Data Documentation | CollectionView API Reference

This example uses Angular.

JavaScript
Angular
Vue
React
app.component.ts
index.html
app.component.html
styles.css
rest-collection-view-ext.ts
Copy to CodeMine
import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import './styles.css';
//
import '@angular/compiler';
import { Component, enableProdMode, ChangeDetectorRef, ɵresolveComponentResources, ViewChild } from '@angular/core';

import { BrowserModule, bootstrapApplication } from '@angular/platform-browser';
import { WjGridModule } from '@mescius/wijmo.angular2.grid';
import { WjGridFilterModule } from '@mescius/wijmo.angular2.grid.filter';
import { WjInputModule } from '@mescius/wijmo.angular2.input';
import { RestCollectionViewExt } from './rest-collection-view-ext';
import { FlexGrid } from '@mescius/wijmo.grid';
import { createElement } from '@mescius/wijmo';

// field info for PurchaseOrders table
const fields = 'OrderId,StockItem,Color,State,City,Quantity,UnitPrice,Date,IsChillerStock'.split(',');
//
@Component({
  standalone: true,
  imports: [WjGridModule, WjGridFilterModule, WjInputModule, BrowserModule],
  selector: 'app-component',
  templateUrl: 'src/app.component.html',
})
export class AppComponent {
  enablePaging = true;
  pageSize = 100;
  isReadOnly = true;
  //create RestCollectionViewExt instance
  view = new RestCollectionViewExt('purchaseorders', {
    fields: fields,
    pageSize: this.pageSize,
    loading: () => {
      this.toggleSpinner(this._flexGrid, true);
    },
    loaded: () => {
      this.toggleSpinner(this._flexGrid, false);
    },
  });
  @ViewChild('theGrid', { static: true }) private _flexGrid: FlexGrid;
  constructor(private readonly _chDetector: ChangeDetectorRef) {}
  //toggle b/w paging and virtualization
  toggleFeature(feature: string) {
    let view = this.view;
    if (feature == 'paging') {
      this.enablePaging = true;
      view.pageSize = this.pageSize;
      view.virtualization = false;
    } else {
      this.enablePaging = false;
      view.pageSize = 0;
      view.virtualization = true;
    }
  }
  //show gif loader while data loading
  toggleSpinner(grid: FlexGrid, show: boolean) {
    let _rect = grid.controlRect;
    let elem: HTMLElement = grid.hostElement.querySelector('.spinner');
    if (!elem)
      elem = createElement(
        `<div class='spinner' style="left:${_rect.left}px;top:${_rect.top}px;width:${_rect.width}px;height:${_rect.height}px;"><img src="resources/Rounded%20blocks.gif"></div>`,
        grid.hostElement,
      );
    elem.style.display = show ? 'block' : 'none';
  }
}
enableProdMode();

// Resolve resources (templateUrl, styleUrls etc), After resolution all URLs have been converted into `template` strings.
ɵresolveComponentResources(fetch).then(() => {
  // Bootstrap application
  bootstrapApplication(AppComponent).catch((err) => console.error(err));
});
import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; // import '@angular/compiler'; import { Component, enableProdMode, ChangeDetectorRef, ɵresolveComponentResources, ViewChild } from '@angular/core'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { WjGridFilterModule } from '@mescius/wijmo.angular2.grid.filter'; import { WjInputModule } from '@mescius/wijmo.angular2.input'; import { RestCollectionViewExt } from './rest-collection-view-ext'; import { FlexGrid } from '@mescius/wijmo.grid'; import { createElement } from '@mescius/wijmo'; // field info for PurchaseOrders table const fields = 'OrderId,StockItem,Color,State,City,Quantity,UnitPrice,Date,IsChillerStock'.split(','); // @Component({ standalone: true, imports: [WjGridModule, WjGridFilterModule, WjInputModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html', }) export class AppComponent { enablePaging = true; pageSize = 100; isReadOnly = true; //create RestCollectionViewExt instance view = new RestCollectionViewExt('purchaseorders', { fields: fields, pageSize: this.pageSize, loading: () => { this.toggleSpinner(this._flexGrid, true); }, loaded: () => { this.toggleSpinner(this._flexGrid, false); }, }); @ViewChild('theGrid', { static: true }) private _flexGrid: FlexGrid; constructor(private readonly _chDetector: ChangeDetectorRef) {} //toggle b/w paging and virtualization toggleFeature(feature: string) { let view = this.view; if (feature == 'paging') { this.enablePaging = true; view.pageSize = this.pageSize; view.virtualization = false; } else { this.enablePaging = false; view.pageSize = 0; view.virtualization = true; } } //show gif loader while data loading toggleSpinner(grid: FlexGrid, show: boolean) { let _rect = grid.controlRect; let elem: HTMLElement = grid.hostElement.querySelector('.spinner'); if (!elem) elem = createElement( `<div class='spinner' style="left:${_rect.left}px;top:${_rect.top}px;width:${_rect.width}px;height:${_rect.height}px;"><img src="resources/Rounded%20blocks.gif"></div>`, grid.hostElement, ); elem.style.display = show ? 'block' : 'none'; } } enableProdMode(); // Resolve resources (templateUrl, styleUrls etc), After resolution all URLs have been converted into `template` strings. ɵresolveComponentResources(fetch).then(() => { // Bootstrap application bootstrapApplication(AppComponent).catch((err) => console.error(err)); });
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo RestCollectionView RestAPI</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/fesm2015/zone.min.js"></script> <!-- 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> // workaround to load 'rxjs/operators' from the rxjs bundle System.import('rxjs').then(function (m) { System.set(SystemJS.resolveSync('rxjs/operators'), System.newModule(m.operators)); System.import('./src/app.component'); }); </script> </head> <body> <app-component></app-component> </body> </html>
<div class="container-fluid"> <label> <input id="paging" type="radio" name="viewtype" value="paging" checked (change)="toggleFeature('paging')">Paging </label> <label> <input id="virtualization" type="radio" name="viewtype" value="virtualization" (change)="toggleFeature('virtualization')">Virtualization </label> <br /> <div *ngIf="enablePaging"> <wj-collection-view-navigator #nav [cv]="view" [byPage]="true"> </wj-collection-view-navigator> </div> <wj-flex-grid #theGrid [isReadOnly]="isReadOnly" [itemsSource]="view"> <wj-flex-grid-filter></wj-flex-grid-filter> </wj-flex-grid> </div>
body { margin-bottom: 36pt; margin-top:10px; } label{ padding-right: 10px; } .wj-flexgrid { height: 400px; } .spinner{ position: absolute; z-index: 10; opacity: .5; } .spinner img { margin: auto; position: relative; top:40%; left:45%; }
import { RestCollectionView } from '@mescius/wijmo.rest'; import { DataType, isDate, DateTime, asNumber, isBoolean, httpRequest, copy, changeType, isString } from '@mescius/wijmo'; const _apiUrl = "https://demodata.mescius.io/wwi/api/v1/"; /** * Class that extends {@link RestCollectionView} to support RestAPI data sources. */ export class RestCollectionViewExt extends RestCollectionView { _pendingRequest: XMLHttpRequest; _url: string = _apiUrl; _tbl: string; /** * Initializes a new instance of the {@link RestCollectionViewExt} 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 RestCollectionView}. */ constructor(tableName: string, options?: any) { super(); this._tbl = tableName; copy(this, options); } // parse json data protected _jsonReviver(key: string, value: any): any { const _rxDate = /^\d{4}\-\d{2}\-\d{2}T\d{2}\:\d{2}\:\d{2}|\/Date\([\d\-]*?\)/; if (typeof value === 'string' && _rxDate.test(value)) { value = value.indexOf('/Date(') == 0 // verbosejson ? new Date(parseInt(value.substr(6))) : new Date(value); } return value; } // get parameter for sorting, filtering, paging and virtualization _getReadParams(): any { let settings: any = {}; // apply filter if (this.filterOnServer && this._filterProvider) { let filter = this._asODataFilter(this._filterProvider); if (filter.length > 0) { settings.filterBy = filter; } } //apply sortBy if (this.sortOnServer && this.sortDescriptions.length > 0) { let _sortBy = []; for (let i = 0; i < this.sortDescriptions.length; i++) { let sort = `${this.sortDescriptions[i].property} ${this.sortDescriptions[i].ascending ? 'ASC' : 'DESC'}`; _sortBy.push(sort);// add sort } settings.sortBy = _sortBy.join(','); } // current view window if (this.virtualization) { settings.skip = this._start; settings.top = this._fetchSize(); } // get page params if (this.pageOnServer && this.pageSize > 0) { settings.skip = this.pageIndex * this.pageSize settings.top = this.pageSize; } if (this.fields && this.fields.length > 0) { settings.select = this.fields; } return settings; } // ** overrides protected getItems(): Promise<any[]> { // cancel any pending requests if (this._pendingReq) { this._pendingReq.abort(); } return new Promise<any>(resolve => { let _settings = this._getReadParams(); // get the items virtually this._pendingReq = httpRequest(this._url + this._tbl, { requestHeaders: this.requestHeaders, data: _settings, success: async xhr => { // parse response let resp = JSON.parse(xhr.responseText, this._jsonReviver); let _count = asNumber(resp.totalItemCount); if (_count != this._totalItemCount) this._totalItemCount = _count; resolve(resp.items); }, error: xhr => this._raiseError(xhr.responseText, false), complete: xhr => { this._pendingReq = null; }// no pending requests }); });; } //#region Filter Implementation // gets the OData filter definition from a wijmo.grid.filter.FlexGridFilter object. // https://www.odata.org/documentation/odata-version-2-0/uri-conventions/ _asODataFilter(filter: any): string { let def = ''; for (let c = 0; c < filter.grid.columns.length; c++) { let col = filter.grid.columns[c], cf = filter.getColumnFilter(col, false); if (cf && cf.isActive) { if (def) { def += ' and '; } if (cf.conditionFilter && cf.conditionFilter.isActive) { def += this._asODataConditionFilter(cf.conditionFilter); } else if (cf.valueFilter && cf.valueFilter.isActive) { def += this._asODataValueFilter(cf.valueFilter); } } } return def; } _asODataValueFilter(vf: any): string { let col = vf.column, fld = col.binding, map = col.dataMap, def = ''; // build condition with 'eq/or' for (let key in vf.showValues) { let value = changeType(key, col.dataType, col.format); if (map && isString(value)) { // TFS 239356 value = map.getKeyValue(value); } if (def) def += ' or '; def += this._asEquals(fld, value, col.dataType); } // enclose in parenthesis if not empty if (def.length) { def = '(' + def + ')'; } // all done return def; } _asEquals(fld: string, value: any, type: DataType): string { let def = '', DT = DataType; if (value === '' || value == null) { // null or empty def += fld + ' eq null'; if (type == DT.String) { // empty OK for strings only def += ' or ' + fld + ' eq \'\''; } } else if (type == DT.Date) { // non-null/empty dates (TFS 458080) def += fld + ' ge ' + this._asODataValue(value, type) + ' and ' + fld + ' lt ' + this._asODataValue(DateTime.addDays(value, 1), type); } else { // other types def += fld + ' eq ' + this._asODataValue(value, type); } return '(' + def + ')'; } _asODataConditionFilter(cf: any): string { let c1 = this._asODataCondition(cf, cf.condition1), c2 = this._asODataCondition(cf, cf.condition2); if (c1 && c2) return '(' + c1 + (cf.and ? ' and ' : ' or ') + c2 + ')'; if (c1) return '(' + c1 + ')'; if (c2) return '(' + c2 + ')'; return null; } _asODataCondition(cf: any, cnd: any): string { let col = cf.column, fld = col.binding, map = col.dataMap, value = cnd.value; if (map && isString(value)) { // TFS 440901 value = map.getKeyValue(value); } value = this._asODataValue(value, cf.column.dataType); switch (cnd.operator) { case 0: // EQ = 0, return fld + ' eq ' + value; case 1: // NE = 1, return fld + ' ne ' + value; case 2: // GT = 2, return fld + ' gt ' + value; case 3: // GE = 3, return fld + ' ge ' + value; case 4: // LT = 4, return fld + ' lt ' + value; case 5: // LE = 5, return fld + ' le ' + value; case 6: // BW = 6, return `${fld} starts-with ${value}`; case 7: // EW = 7, return `${fld} ends-with ${value}`; case 8: // CT = 8, return `${fld} contains ${value}`; case 9: // NC = 9 return `${fld} not-contains ${value}`; case 10: // NBW = 10 return `${fld} not-starts-with ${value}`; case 11: // NEW = 11 return `${fld} not-ends-with ${value}`; } } _asODataValue(value: any, dataType: DataType): string { if (isDate(value)) { value = `'${value.toJSON()}'`; return value; } else if (isString(value)) { return "'" + value.replace(/'/g, "''") + "'"; } else if (isBoolean(value)) { return "'" + value + "'"; } else if (value != null) { return value.toString(); } return dataType == DataType.String ? "''" : null; } //#endRegion }
(function (global) { SystemJS.config({ transpiler: './plugin-typescript.js', typescriptOptions: { "target": "ES2022", "module": "system", "emitDecoratorMetadata": true, "experimentalDecorators": true, }, baseURL: 'node_modules/', meta: { 'typescript': { "exports": "ts" }, '*.css': { loader: 'systemjs-plugin-css' }, '*.mjs': { format: 'esm' }, }, paths: { // paths serve as alias 'npm:': '' }, packageConfigPaths: [ '/node_modules/*/package.json', "/node_modules/@angular/*/package.json", "/node_modules/@mescius/*/package.json" ], map: { 'core-js': 'https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js', 'typescript': 'https://cdnjs.cloudflare.com/ajax/libs/typescript/5.2.2/typescript.min.js', "rxjs": "https://cdnjs.cloudflare.com/ajax/libs/rxjs/7.8.1/rxjs.umd.min.js", 'systemjs-plugin-css': 'https://cdn.jsdelivr.net/npm/systemjs-plugin-css@0.1.37/css.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', 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'npm:@angular/forms/fesm2022/forms.mjs', }, // packages tells the System loader how to load when no filename and/or no extension packages: { "./src": { defaultExtension: 'ts' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);