---
title: Nest Content Within Choice Options
product: Survey Creator
description: Create dynamic nesting choice options in Checkboxes and Radio Button Group questions. When a respondent selects a specific choice, follow-up sub-questions appear automatically cascading from that option. View our free JavaScript demo to learn more.
framework: Angular
source: https://surveyjs.io/survey-creator/examples/nest-sub-questions-within-choice-options/angular
index: https://surveyjs.io/survey-creator/examples/overview.md
---

# Nest Content Within Choice Options (Angular)

Survey authors can insert questions and panels inside individual choice options in Checkboxes and Radio Button Group questions. These nested elements appear dynamically when respondents select the corresponding option. To add a nested question or panel, click the button on the right side of a choice option on the design surface.

To enable this feature in Survey Creator, set the [`maxChoiceContentNestingLevel`](/survey-creator/documentation/api-reference/icreatoroptions#maxChoiceContentNestingLevel) property to an integer value. This property defines how many levels of nesting are allowed:

- 0 - Disables nesting (default).
- 1 - Allows first-level choice options to contain survey elements.
- 2 - Allows first- and second-level choice options to contain survey elements, and so on.

In this demo, the `maxChoiceContentNestingLevel` property is set to 2.

## Files

### `src/app/components/creator.component.css`

```css
/* You can define custom CSS rules here */
```

### `src/app/components/creator.component.html`

```html
<div style="position: fixed; top: 0; bottom: 0; right: 0; left: 0;">
    <survey-creator [model]="model"></survey-creator>
</div>
```

### `src/app/components/survey_json.js`

```js
export const surveyJSON = {
  "elements": [
    {
      "type": "checkbox",
      "name": "event_preferences",
      "title": "Which types of events are you interested in attending?",
      "choices": [
        {
          "value": "music",
          "text": "Music events",
          "elements": [
            {
              "type": "checkbox",
              "name": "music_event_type",
              "title": "Which type of music event would you like to attend?",
              "isRequired": true,
              "choices": [
                {
                  "value": "concert",
                  "text": "Concert",
                  "elements": [
                    {
                      "type": "text",
                      "name": "preferred_concert_genre",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "placeholder": "Enter preferred music genre (e.g., Rock, Jazz)"
                    },
                    {
                      "type": "text",
                      "name": "preferred_concert_date",
                      "titleLocation": "hidden",
                      "inputType": "month",
                      "placeholder": "Preferred date"
                    }
                  ]
                },
                {
                  "value": "festival",
                  "text": "Music festival",
                  "elements": [
                    {
                      "type": "text",
                      "name": "preferred_festival_name",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "placeholder": "Enter festival name or type"
                    }
                  ]
                }
              ]
            }
          ]
        },
        {
          "value": "sports",
          "text": "Sports events",
          "elements": [
            {
              "type": "checkbox",
              "name": "sports_event_type",
              "title": "Which sports events are you interested in?",
              "isRequired": true,
              "choices": [
                {
                  "value": "match",
                  "text": "Live match",
                  "elements": [
                    {
                      "type": "dropdown",
                      "name": "preferred_sport",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "choices": [
                        "Football",
                        "Basketball",
                        "Tennis"
                      ],
                      "placeholder": "Select sport"
                    }
                  ]
                },
                {
                  "value": "tournament",
                  "text": "Tournament",
                  "elements": [
                    {
                      "type": "text",
                      "name": "preferred_tournament",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "placeholder": "Enter preferred tournament (e.g., Wimbledon)"
                    }
                  ]
                }
              ]
            }
          ]
        },
        {
          "value": "cultural",
          "text": "Cultural events",
          "elements": [
            {
              "type": "checkbox",
              "name": "cultural_event_type",
              "title": "Which cultural event are you interested in?",
              "isRequired": true,
              "choices": [
                {
                  "value": "museum",
                  "text": "Museum exhibition",
                  "elements": [
                    {
                      "type": "text",
                      "name": "preferred_museum_theme",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "placeholder": "Enter theme or type (e.g., Art, History)"
                    }
                  ]
                },
                {
                  "value": "theater",
                  "text": "Theater performance",
                  "elements": [
                    {
                      "type": "text",
                      "name": "preferred_theater_show",
                      "titleLocation": "hidden",
                      "isRequired": true,
                      "placeholder": "Enter the name of the show"
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    },
    {
      "type": "checkbox",
      "name": "contact_methods",
      "title": "How may we contact you?",
      "choices": [
        {
          "value": "email",
          "text": "By email",
          "elements": [
            {
              "type": "text",
              "name": "email_address",
              "titleLocation": "hidden",
              "inputType": "email",
              "placeholder": "Enter your email address"
            }
          ]
        },
        {
          "value": "phone_call",
          "text": "By phone call",
          "elements": [
            {
              "type": "text",
              "name": "phone_number_call",
              "titleLocation": "hidden",
              "isRequired": true,
              "inputType": "tel",
              "placeholder": "Enter your phone number"
            },
            {
              "type": "comment",
              "name": "preferred_call_time",
              "titleLocation": "hidden",
              "placeholder": "Enter a convenient time to call"
            }
          ]
        },
        {
          "value": "sms",
          "text": "By SMS",
          "elements": [
            {
              "type": "text",
              "name": "phone_number_sms",
              "titleLocation": "hidden",
              "valueName": "phone_number_call",
              "inputType": "tel",
              "placeholder": "Enter your phone number"
            }
          ]
        },
        {
          "value": "telegram",
          "text": "By Telegram",
          "elements": [
            {
              "type": "text",
              "name": "telegram_username",
              "titleLocation": "hidden",
              "isRequired": true,
              "placeholder": "Enter your Telegram username"
            }
          ]
        }
      ]
    }
  ]
};
```

### `src/app/components/creator.component.ts`

```ts
import { Component, OnInit } from "@angular/core";
import { SurveyCreatorModel } from "survey-creator-core";
import "survey-core/survey.i18n";
import "survey-creator-core/survey-creator-core.i18n";
import { surveyJSON } from "./survey_json";
import "survey-core/survey-core.css";
import "survey-creator-core/survey-creator-core.css";

import SurveyTheme from "survey-core/themes";
import { registerCreatorTheme } from "survey-creator-core";

registerCreatorTheme(SurveyTheme); // Add predefined Survey Creator UI themes

@Component({
    // tslint:disable-next-line:component-selector
    selector: "component-survey-creator",
    templateUrl: "./creator.component.html",
    styleUrls: ["./creator.component.css"]
})
export class SurveyCreatorComponent implements OnInit {
    model: SurveyCreatorModel;
    ngOnInit() {
        const creator = new SurveyCreatorModel({ maxChoiceContentNestingLevel: 2 });
        creator.JSON = surveyJSON;
        this.model = creator;
    }
}
```

### `src/app/app.component.html`

```html
<component-survey-creator></component-survey-creator>
```

### `src/app/app.component.ts`

```ts
import { Component } from "@angular/core";

@Component({
    selector: "app-root",
    templateUrl: "./app.component.html"
})
export class AppComponent {
    title = "CodeSandbox";
}
```

### `src/app/app.module.ts`

```ts
import { BrowserModule } from "@angular/platform-browser";
import { NgModule } from "@angular/core";
import { AppComponent } from "./app.component";
import { SurveyCreatorModule } from "survey-creator-angular";
import { SurveyCreatorComponent } from "./components/creator.component";

@NgModule({
    declarations: [AppComponent, SurveyCreatorComponent],
    imports: [BrowserModule, SurveyCreatorModule],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }
```

### `src/environments/environment.prod.ts`

```ts
export const environment = {
    production: true
};
```

### `src/environments/environment.ts`

```ts
// The file contents for the current environment will overwrite these during build.
// The build system defaults to the dev environment which uses `environment.ts`, but if you do
// `ng build --env=prod` then `environment.prod.ts` will be used instead.
// The list of which env maps to which file can be found in `.angular-cli.json`.

export const environment = {
    production: false
};
```

### `src/index.html`

```html
<app-root></app-root>
```

### `src/main.ts`

```ts
import { enableProdMode } from "@angular/core";
import { platformBrowserDynamic } from "@angular/platform-browser-dynamic";

import { AppModule } from "./app/app.module";
import { environment } from "./environments/environment";

if (environment.production) {
    enableProdMode();
}

platformBrowserDynamic()
    .bootstrapModule(AppModule)
    .catch(err => console.log(err));
```

### `src/polyfills.ts`

```ts
/**
 * This file includes polyfills needed by Angular and is loaded before the app.
 * You can add your own extra polyfills to this file.
 *
 * This file is divided into 2 sections:
 *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
 *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
 *      file.
 *
 * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
 * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
 * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
 *
 * Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html
 */

/***************************************************************************************************
 * BROWSER POLYFILLS
 */

/** IE9, IE10 and IE11 requires all of the following polyfills. **/
// import 'core-js/es6/symbol';
// import 'core-js/es6/object';
// import 'core-js/es6/function';
// import 'core-js/es6/parse-int';
// import 'core-js/es6/parse-float';
// import 'core-js/es6/number';
// import 'core-js/es6/math';
// import 'core-js/es6/string';
// import 'core-js/es6/date';
// import 'core-js/es6/array';
// import 'core-js/es6/regexp';
// import 'core-js/es6/map';
// import 'core-js/es6/weak-map';
// import 'core-js/es6/set';

/** IE10 and IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js';  // Run `npm install classlist.js`.

/** IE10 and IE11 requires the following for the Reflect API. */
// import 'core-js/es6/reflect';

/** Evergreen browsers require these. **/
// Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
import "core-js/proposals/reflect-metadata";

/**
 * Required to support Web Animations `@angular/platform-browser/animations`.
 * Needed for: All but Chrome, Firefox and Opera. http://caniuse.com/#feat=web-animation
 **/
// import 'web-animations-js';  // Run `npm install web-animations-js`.

/***************************************************************************************************
 * Zone JS is required by default for Angular itself.
 */
import "zone.js/dist/zone"; // Included with Angular CLI.

/***************************************************************************************************
 * APPLICATION IMPORTS
 */
```

### `src/styles.css`

```css
/* You can add global styles to this file and import other style files */
```

### `src/typings.d.ts`

```ts
/* SystemJS module definition */
declare var module: NodeModule;
interface NodeModule {
    id: string;
}
```

### `.angular-cli.json`

```json
{
  "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [ "assets", "favicon.ico" ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "prefix": "app",
      "styles": [ "styles.css"  ],
      "scripts": [  ],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ]
}
```

### `_tsconfig.json`

```json
{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "allowSyntheticDefaultImports": true,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "resolveJsonModule": true,
    "target": "es2015",
    "module": "es2020",
    "lib": [
      "es2018",
      "dom"
    ]
  }
}
```

### `package.json`

```json
{
  "name": "surveyjs-angular",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "14.1.1",
    "@angular/cdk": "14.1.1",
    "@angular/common": "14.1.1",
    "@angular/compiler": "14.1.1",
    "@angular/core": "14.1.1",
    "@angular/forms": "14.1.1",
    "@angular/platform-browser": "14.1.1",
    "@angular/platform-browser-dynamic": "14.1.1",
    "@angular/router": "14.1.1",
    "core-js": "3.6.4",
    "rxjs": "6.5.4",
    "survey-angular-ui": "latest",
    "survey-creator-core": "latest",
    "survey-core": "latest",
    "survey-creator-angular": "latest",
    "tslib": "1.13.0",
    "zone.js": "0.11.7"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~13.0.0",
    "@angular/cli": "~13.0.0",
    "@types/jasmine": "3.6.3",
    "@types/jasminewd2": "2.0.8",
    "@types/node": "14.14.28",
    "codelyzer": "6.0.1",
    "jasmine-core": "3.6.0",
    "jasmine-spec-reporter": "6.0.0",
    "karma": "6.1.1",
    "karma-chrome-launcher": "3.1.0",
    "karma-coverage-istanbul-reporter": "3.0.3",
    "karma-jasmine": "4.0.1",
    "karma-jasmine-html-reporter": "1.5.4",
    "protractor": "7.0.0",
    "ts-node": "9.1.1",
    "tslint": "~6.1.3",
    "typescript": "4.1.5"
  },
  "keywords": [ "angular", "surveyjs" ],
  "description": "SurveyJS-Angular example project"
}
```

## Other Frameworks

- [React](https://surveyjs.io/survey-creator/examples/nest-sub-questions-within-choice-options/reactjs.md)
- [Vue 3](https://surveyjs.io/survey-creator/examples/nest-sub-questions-within-choice-options/vue3js.md)
- [jQuery](https://surveyjs.io/survey-creator/examples/nest-sub-questions-within-choice-options/jquery.md)
- [Vanilla JS](https://surveyjs.io/survey-creator/examples/nest-sub-questions-within-choice-options/vanillajs.md)