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Tree List

Web API Service

To access a Web API service from the client, use the createStore method from the DevExtreme.AspNet.Data extension. This extension also allows you to process data for DevExtreme components on the server. The server-side implementation is available under the TreeListTasksController.cs tab in the ASP.NET MVC and ASP.NET Core versions of this demo.

To notify the TreeList that data is processed on the server, set the remoteOperations property to true.

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<dx-tree-list id="tree-list" [dataSource]="tasksData" keyExpr="Task_ID" parentIdExpr="Task_Parent_ID" hasItemsExpr="Has_Items" [expandedRowKeys]="[1, 2]" [showRowLines]="true" [showBorders]="true" [columnAutoWidth]="true" [wordWrapEnabled]="true" (onInitNewRow)="initNewRow($event)"> <dxo-remote-operations [filtering]="true" [sorting]="true" [grouping]="true"></dxo-remote-operations> <dxo-search-panel [visible]="true"></dxo-search-panel> <dxo-header-filter [visible]="true"></dxo-header-filter> <dxo-editing mode="row" [allowAdding]="true" [allowUpdating]="true" [allowDeleting]="true"> </dxo-editing> <dxi-column dataField="Task_Subject" [minWidth]="250"> <dxi-validation-rule type="required"></dxi-validation-rule> </dxi-column> <dxi-column dataField="Task_Assigned_Employee_ID" caption="Assigned" [minWidth]="120"> <dxo-lookup [dataSource]="employeesData" valueExpr="ID" displayExpr="Name"></dxo-lookup> <dxi-validation-rule type="required"></dxi-validation-rule> </dxi-column> <dxi-column dataField="Task_Status" caption="Status" [minWidth]="120"> <dxo-lookup [dataSource]="statusesData"></dxo-lookup> </dxi-column> <dxi-column dataField="Task_Start_Date" caption="Start Date" dataType="date"></dxi-column> <dxi-column dataField="Task_Due_Date" caption="Due Date" dataType="date"></dxi-column> </dx-tree-list>
import { NgModule, Component, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxTreeListModule } from 'devextreme-angular'; import * as AspNetData from "devextreme-aspnet-data-nojquery"; if(!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'] }) export class AppComponent { tasksData: any; employeesData: any; statusesData: Array<string>; constructor() { var url = "https://js.devexpress.com/Demos/Mvc/api/TreeListTasks"; this.tasksData = AspNetData.createStore({ key: "Task_ID", loadUrl: url + "/Tasks", insertUrl: url + "/InsertTask", updateUrl: url + "/UpdateTask", deleteUrl: url + "/DeleteTask", onBeforeSend: function(method, ajaxOptions) { ajaxOptions.xhrFields = { withCredentials: true }; } }); this.employeesData = AspNetData.createStore({ key: "ID", loadUrl: url + "/TaskEmployees" }); this.statusesData = [ "Not Started", "Need Assistance", "In Progress", "Deferred", "Completed" ]; } initNewRow(e) { e.data.Task_Status = "Not Started"; e.data.Task_Start_Date = new Date(); e.data.Task_Due_Date = new Date(); } } @NgModule({ imports: [ BrowserModule, DxTreeListModule ], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #tree-list { max-height: 640px; }
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ System.config({ transpiler: 'ts', typescriptOptions: { module: "system", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" }, 'devextreme-aspnet-data-nojquery': { "esModule": true }, 'devextreme/localization.js': { "esModule": true } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.5.3/lib/typescript.js', '@angular': 'npm:@angular', 'tslib': 'npm:tslib@2.2.0/tslib.js', 'rxjs': 'npm:rxjs@6.4.0', 'devextreme-aspnet-data-nojquery': 'npm:devextreme-aspnet-data-nojquery@2.7.1/index.js', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.26.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@20.2.7', 'jszip': 'npm:jszip@3.6.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.10.3/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.23', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.29', 'devextreme-angular': 'npm:devextreme-angular@20.2.6', 'preact': 'npm:preact@10.5.13/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.13/hooks/dist/hooks.js' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'devextreme/events/utils': { main: 'index' }, 'devextreme/events': { main: 'index' }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js' } }, packageConfigPaths: [ "npm:@angular/*/package.json", "npm:@angular/common/*/package.json", "npm:rxjs/package.json", "npm:rxjs/operators/package.json", "npm:devextreme-angular/*/package.json", "npm:devextreme-angular/ui/*/package.json", "npm:devextreme-angular/package.json", "npm:devexpress-diagram/package.json", "npm:devexpress-gantt/package.json", ] });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.7/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.7/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.10.2/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import('app').catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>