Filtering Hierarchical Data (Angular)

The CollectionView class supports filtering only for items that are direct children of the collection. In most cases, it does not work well for hierarchical data. Filtering hierarchical data is not a trivial exercise because when a child element is visible, all its ancestors should also be visible. The grid below shows how you can implement a simple hierarchical binding method that will show cities that match the filter and states that match the filter or contain cities that do. For example, try typing 'San' in the filter box:

Learn about FlexGrid | Filtering Hierarchical Data Documentation | FlexGrid API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; import '@angular/compiler'; import { Component, enableProdMode, NgModule, ViewChild } from '@angular/core'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { BrowserModule } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { FlexGrid, GroupRow } from '@mescius/wijmo.grid'; @Component({ selector: 'app-component', templateUrl: 'src/app.component.html' }) export class AppComponent { data: any[]; constructor() { this.data = this._getData(); } @ViewChild('flex', { static: true }) flex: FlexGrid; @ViewChild('filter', { static: true }) filter: any; applyHierarchicalFilter() { let filter = this.filter.nativeElement.value.toLowerCase(), grid = this.flex, rows = grid.rows; for (let i = 0; i < rows.length; i++) { let row = rows[i] as GroupRow, state = row.dataItem, rng = row.getCellRange(); // handle states (level 0) if (row.level == 0) { // check if the state name matches the filter let stateVisible = state.name.toLowerCase().indexOf(filter) >= 0; if (stateVisible) { // it does, so show the state and all its cities for (let j = rng.topRow; j <= rng.bottomRow; j++) { rows[j].visible = true; } } else { // it does not, so check the cities for (let j = rng.topRow + 1; j <= rng.bottomRow; j++) { let city = rows[j].dataItem, cityVisible = city.name.toLowerCase().indexOf(filter) >= 0; rows[j].visible = cityVisible; stateVisible = stateVisible || cityVisible; } // if at least one city is visible, the state is visible rows[i].visible = stateVisible; } // move on to the next group i = rng.bottomRow; } } } private _getData() { return [ { name: 'Washington', type: 'state', population: 6971, cities: [ { name: 'Seattle', type: 'city', population: 652 }, { name: 'Spokane', type: 'city', population: 210 }] }, { name: 'Oregon', type: 'state', population: 3930, cities: [ { name: 'Portland', type: 'city', population: 609 }, { name: 'Eugene', type: 'city', population: 159 }] }, { name: 'California', type: 'state', population: 38330, cities: [ { name: 'Los Angeles', type: 'city', population: 3884 }, { name: 'San Diego', type: 'city', population: 1356 }, { name: 'San Francisco', type: 'city', population: 837 }] } ]; } } @NgModule({ imports: [WjGridModule, BrowserModule], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } enableProdMode(); // Bootstrap application with hash style navigation and global services. platformBrowserDynamic().bootstrapModule(AppModule);
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Filtering Hierarchical Data</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"> <div class="input-group"> <div class="input-group-addon"> <span class="glyphicon glyphicon-search"></span> </div> <input #filter class="form-control" placeholder="Filter" (input)="applyHierarchicalFilter()" /> </div> <wj-flex-grid #flex [childItemsPath]="'cities'" [headersVisibility]="'Column'" [itemsSource]="data" (sortedColumn)="applyHierarchicalFilter()"> </wj-flex-grid> <p> For more details in hierarchical filtering, please see our <a href="/blogs/filter-hierarchical-data-flexgrid/" target="_blank"> How to Filter Hierarchical Data in FlexGrid and Angular </a> blog. </p> </div>
.wj-flexgrid { max-height: 250px; margin: 10px 0; } .wj-cell.wj-group { border: none; } .wj-cell.wj-group:not(.wj-state-selected):not(.wj-state-multi-selected) { background-color: white; } body { margin-bottom: 20px; }
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