Cascading combobox sample committed

.editorconfig

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+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+ij_typescript_use_double_quotes = false
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.gitignore

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+# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+
+# System files
+.DS_Store
+Thumbs.db

angular.json

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+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "myapp": {
+      "projectType": "application",
+      "schematics": {},
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/myapp",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": [
+              "zone.js"
+            ],
+            "tsConfig": "tsconfig.app.json",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.css"
+            ],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kB",
+                  "maximumError": "1MB"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "2kB",
+                  "maximumError": "4kB"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "myapp:build:production"
+            },
+            "development": {
+              "buildTarget": "myapp:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n"
+        },
+        "test": {
+          "builder": "@angular-devkit/build-angular:karma",
+          "options": {
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
+            "tsConfig": "tsconfig.spec.json",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.css"
+            ],
+            "scripts": []
+          }
+        }
+      }
+    }
+  },
+  "cli": {
+    "analytics": false
+  }
+}

package.json

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+{
+  "name": "myapp",
+  "version": "0.0.0",
+  "scripts": {
+    "ng": "ng",
+    "start": "ng serve",
+    "build": "ng build",
+    "watch": "ng build --watch --configuration development",
+    "test": "ng test"
+  },
+  "private": true,
+  "dependencies": {
+    "@angular/animations": "^18.2.0",
+    "@angular/common": "^18.2.0",
+    "@angular/compiler": "^18.2.0",
+    "@angular/core": "^18.2.0",
+    "@angular/forms": "^18.2.0",
+    "@angular/platform-browser": "^18.2.0",
+    "@angular/platform-browser-dynamic": "^18.2.0",
+    "@angular/router": "^18.2.0",
+    "@syncfusion/ej2-angular-dropdowns": "^27.2.2",
+    "rxjs": "~7.8.0",
+    "tslib": "^2.3.0",
+    "zone.js": "~0.14.10"
+  },
+  "devDependencies": {
+    "@angular-devkit/build-angular": "^18.2.12",
+    "@angular/cli": "^18.2.12",
+    "@angular/compiler-cli": "^18.2.0",
+    "@types/jasmine": "~5.1.0",
+    "jasmine-core": "~5.2.0",
+    "karma": "~6.4.0",
+    "karma-chrome-launcher": "~3.2.0",
+    "karma-coverage": "~2.2.0",
+    "karma-jasmine": "~5.1.0",
+    "karma-jasmine-html-reporter": "~2.1.0",
+    "typescript": "~5.5.2"
+  }
+}

src/app/app.component.html

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+<div class="wrapper">
+  <ejs-combobox #country
+    [dataSource]="countryData" 
+    [fields]="countryFields" 
+    [placeholder]="countryWatermark"
+    (change)="countryChange()">
+  </ejs-combobox>
+  <div style="padding-top: 35px;">
+    <ejs-combobox #state
+     [dataSource]="stateData"
+     [fields]="stateFields"
+     [placeholder]="stateWatermark"
+     [enabled]="false"></ejs-combobox>
+  </div>
+</div>

src/app/app.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [AppComponent],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have the 'myapp' title`, () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('myapp');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement as HTMLElement;
+    expect(compiled.querySelector('h1')?.textContent).toContain('Hello, myapp');
+  });
+});

src/app/app.component.ts

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+import { ComboBoxModule, ComboBoxComponent } 
+  from '@syncfusion/ej2-angular-dropdowns'
+import { Component, ViewChild } from '@angular/core';
+import { Query } from '@syncfusion/ej2-data';
+
+@Component({
+imports: [ ComboBoxModule ],
+standalone: true,
+    selector: 'app-root',
+    templateUrl: `app.component.html`
+})
+export class AppComponent {
+@ViewChild('country') countryObj?: ComboBoxComponent | any;
+@ViewChild('state') stateObj?: ComboBoxComponent | any;
+public countryChange(): void {
+  let childDataQuery: Query = 
+  new Query().where('countryId', 'equal', this.countryObj.value);
+  this.stateObj.query = childDataQuery;
+  this.stateObj.enabled = true;
+  this.stateObj.text = null;
+  this.stateObj.dataBind();
+};
+public stateWatermark: string = "Select a state";
+
+
+public stateFields: Object = 
+  { text: 'stateName', value: 'stateId' };
+
+
+
+  public stateData: { [key: string]: Object }[] = [
+    { stateName: 'New York', countryId: '1', stateId: '101' },
+    { stateName: 'Queensland', countryId: '2', stateId: '104' },
+    { stateName: 'Tasmania ', countryId: '2', stateId: '105' }, 
+    { stateName: 'Victoria', countryId: '2', stateId: '106' },
+    { stateName: 'Virginia ', countryId: '1', stateId: '102' },
+    { stateName: 'Washington', countryId: '1', stateId: '103' }
+  ];
+
+
+
+public countryData: { [key: string]: Object }[] = [
+  { countryName: 'Australia', countryId: '2' },
+  { countryName: 'United States', countryId: '1' }
+];
+public countryFields: Object = 
+  { text: 'countryName', value: 'countryId' };
+public countryWatermark: string = "Select a country";
+}

src/app/app.config.ts

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+import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
+import { provideRouter } from '@angular/router';
+
+import { routes } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [provideZoneChangeDetection({ eventCoalescing: true }), provideRouter(routes)]
+};

src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+
+export const routes: Routes = [];

src/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>Myapp</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+</head>
+<body>
+  <app-root></app-root>
+</body>
+</html>

src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser';
+import { appConfig } from './app/app.config';
+import { AppComponent } from './app/app.component';
+
+bootstrapApplication(AppComponent, appConfig)
+  .catch((err) => console.error(err));

src/styles.css

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+/* You can add global styles to this file, and also import other style files */
+@import '../node_modules/@syncfusion/ej2-base/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-buttons/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-dropdowns/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-inputs/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-popups/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-lists/styles/material.css';
+@import '../node_modules/@syncfusion/ej2-angular-dropdowns/styles/material.css';
+
+.wrapper {
+    width: 250px;
+    margin: 50px auto;
+}

tsconfig.app.json

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+/* To learn more about Typescript configuration file: https://www.typescriptlang.org/docs/handbook/tsconfig-json.html. */
+/* To learn more about Angular compiler options: https://angular.dev/reference/configs/angular-compiler-options. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/app",
+    "types": []
+  },
+  "files": [
+    "src/main.ts"
+  ],
+  "include": [
+    "src/**/*.d.ts"
+  ]
+}

tsconfig.json

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+/* To learn more about Typescript configuration file: https://www.typescriptlang.org/docs/handbook/tsconfig-json.html. */
+/* To learn more about Angular compiler options: https://angular.dev/reference/configs/angular-compiler-options. */
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "outDir": "./dist/out-tsc",
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "esModuleInterop": true,
+    "sourceMap": true,
+    "declaration": false,
+    "experimentalDecorators": true,
+    "moduleResolution": "bundler",
+    "importHelpers": true,
+    "target": "ES2022",
+    "module": "ES2022",
+    "lib": [
+      "ES2022",
+      "dom"
+    ]
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}