---
title: Modify New Question
product: Survey Creator
description: Learn how to dynamically modify the properties of newly added questions using the onQuestionAdded event. Check out our free demo for JavaScript.
framework: Angular
source: https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/angular
index: https://surveyjs.io/survey-creator/examples/overview.md
---

# Modify New Question (Angular)

Survey Creator raises an [`onQuestionAdded`](https://surveyjs.io/survey-creator/documentation/api-reference/survey-creator#onQuestionAdded) event when users add questions to a survey. You can handle this event to modify the questions on the fly. In this demo, the `onQuestionAdded` event is used to generate GUIDs and use them as question names.

## Implementation

A function that handles the `onQuestionAdded` event accepts an `options` object as the second parameter. The object's `question` property provides access to the question being added, while the `reason` property contains a string value indicating how the question was added: dragged from the Toolbox (`"DROPPED_FROM_TOOLBOX"`), created using the Add Question button (`"ADDED_FROM_PAGEBUTTON"`), duplicated (`"ELEMENT_COPIED"`), or converted from another question type (`"ELEMENT_CONVERTED"`). In this demo, the `onQuestionAdded` function changes the question's `name` property to a GUID and `title` property to a predefined value. These changes do not apply if the question is converted from another type, because in this case the question already has a GUID and a proper title.

```js
var questionCounter = 1;
creator.onQuestionAdded.add((_, options) => {
  if (options.reason === "ELEMENT_CONVERTED")
    return;
  
  const q = options.question;
  q.name = guid();
  q.title = "Question " + questionCounter;
  questionCounter++;
});
```

To ensure that users don't change the generated GUIDs, make the `name` property read-only using the `Serializer` API:

```js
import { Serializer } from "survey-core";
Serializer.findProperty("question", "name").readOnly = true;
```

Survey Creator uses question names in the UI. Now that the question names are GUIDs, they become hard to read and distinguish at a glance. To eliminate this disadvantage, enable the [`useElementTitles`](https://surveyjs.io/survey-creator/documentation/api-reference/icreatoroptions#useElementTitles) property when you instantiate Survey Creator. With this setting, the Survey Creator UI will use question titles instead of the names. 

```js
const creatorOptions = {
  // ...
  useElementTitles: true
}
```

## Similar Events

In addition to `onQuestionAdded`, Survey Creator raises other events that allow you to modify newly added survey elements dynamically. These events are handled similarly to `onQuestionAdded`.

| Event name | Raised when |
| ---------- | ----------- |
| [`onPanelAdded`](https://surveyjs.io/survey-creator/documentation/api-reference/survey-creator#onPanelAdded) | Raised when users add a panel to the survey. |
| [`onPageAdded`](https://surveyjs.io/survey-creator/documentation/api-reference/survey-creator#onPageAdded) | Raised when users add a page to the survey. |
| [`onMatrixColumnAdded`](https://surveyjs.io/survey-creator/documentation/api-reference/survey-creator#onMatrixColumnAdded) | Raised when users add a column to a [Multi-Select](https://surveyjs.io/form-library/documentation/api-reference/matrix-table-with-dropdown-list) or [Dynamic Matrix](https://surveyjs.io/form-library/documentation/api-reference/dynamic-matrix-table-question-model). |
| [`onItemValueAdded`](https://surveyjs.io/survey-creator/documentation/api-reference/survey-creator#onItemValueAdded) | Raised when users add a new item value (column, row, choice). |

## 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/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 { Serializer } from "survey-core";
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

Serializer.findProperty("question", "name").readOnly = true;

function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
        .toString(16)
        .substring(1);
}

function guid() {    
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
        s4() + '-' + s4() + s4() + s4();
}

var questionCounter = 1;
@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({ useElementTitles: true });
        creator.onQuestionAdded.add((_, options) => {
            if (options.reason === "ELEMENT_CONVERTED")
                return;
            
            const q = options.question;
            q.name = guid();
            q.title = "Question " + questionCounter;
            questionCounter++;
        });
        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/dynamically-modify-newly-added-questions/reactjs.md)
- [Vue 3](https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/vue3js.md)
- [jQuery](https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/jquery.md)
- [Vanilla JS](https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/vanillajs.md)