---
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: Vue 3
source: https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/vue3js
index: https://surveyjs.io/survey-creator/examples/overview.md
---

# Modify New Question (Vue 3)

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

### `public/index.html`

```html
<div id="app" style="position: absolute; top: 0; left: 0; right: 0; bottom: 0;"></div>
```

### `src/App.vue`

```html
<template>
    <SurveyCreatorComponent :model="creator" />
</template>
<script setup lang="ts">
    import { SurveyCreatorModel } from "survey-creator-core";
    import { SurveyCreatorComponent } from "survey-creator-vue";
    import { Serializer } from "survey-core";
    import "survey-core/survey.i18n";
    import "survey-creator-core/survey-creator-core.i18n";
    import "survey-core/survey-core.css";
    import "survey-creator-core/survey-creator-core.css";
    import "./index.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;
    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++;
    });
</script>
```

### `src/index.css`

```css
/* You can add your custom CSS here. */
```

### `src/main.ts`

```ts
import { createApp } from "vue";
import App from "./App.vue";

const app = createApp(App);
app.mount("#app");
```

### `src/shims-vue.d.ts`

```ts
/* eslint-disable */
declare module "*.vue" {
    import type { DefineComponent } from "vue"
    const component: DefineComponent<{}, {}, any>
    export default component
}
```

### `.eslintrc.js`

```js
module.exports = {
    root: true,
    env: {
        node: true
    },
    extends: [
        "plugin:vue/vue3-essential",
        "eslint:recommended",
        "@vue/typescript/recommended",
        "@vue/prettier",
        "@vue/prettier/@typescript-eslint"
    ],
    parserOptions: {
        ecmaVersion: 2020
    },
    rules: {
        "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
        "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off"
    },
    overrides: [
        {
            files: [
                "**/__tests__/*.{j,t}s?(x)",
                "**/tests/unit/**/*.spec.{j,t}s?(x)"
            ],
            env: {
                jest: true
            }
        }
    ]
};
```

### `babel.config.js`

```js
module.exports = {
  presets: ["@vue/cli-plugin-babel/preset"]
};
```

### `package.json`

```json
{
  "name": "surveyjs-library-vue3",
  "version": "0.1.0",
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^3.6.5",
    "tslib": "2.6.1",
    "vue": "^3.4.1",
    "survey-core": "latest",
    "survey-vue3-ui": "latest",
    "survey-creator-core": "latest",
    "survey-creator-vue": "latest",
    "vue-router": "^4.0.0-0",
    "vuex": "^4.0.0-0"
  },
  "devDependencies": {
    "@typescript-eslint/eslint-plugin": "^2.33.0",
    "@typescript-eslint/parser": "^2.33.0",
    "@vue/cli-plugin-babel": "~4.5.0",
    "@vue/cli-plugin-eslint": "~4.5.0",
    "@vue/cli-plugin-pwa": "~4.5.0",
    "@vue/cli-plugin-router": "~4.5.0",
    "@vue/cli-plugin-typescript": "~4.5.0",
    "@vue/cli-plugin-vuex": "~4.5.0",
    "@vue/cli-service": "~4.5.0",
    "@vue/compiler-sfc": "^3.0.0",
    "@vue/eslint-config-prettier": "^6.0.0",
    "@vue/eslint-config-typescript": "^5.0.2",
    "@vue/test-utils": "^2.0.0-0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.1.3",
    "eslint-plugin-vue": "^7.0.0-0",
    "node-sass": "^4.12.0",
    "prettier": "^1.19.1",
    "sass-loader": "^8.0.2",
    "typescript": "~3.9.3"
  }
}
```

### `tsconfig.json`

```json
{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "strict": true,
    "jsx": "preserve",
    "importHelpers": true,
    "moduleResolution": "node",
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "sourceMap": true,
    "baseUrl": ".",
    "types": [
      "webpack-env",
      "jest"
    ],
    "paths": {
      "@/*": [
        "src/*"
      ]
    },
    "lib": [
      "esnext",
      "dom",
      "dom.iterable",
      "scripthost"
    ]
  },
  "include": [
    "src/**/*.ts",
    "src/**/*.tsx",
    "src/**/*.vue",
    "tests/**/*.ts",
    "tests/**/*.tsx"
  ],
  "exclude": [
    "node_modules"
  ]
}
```

## Other Frameworks

- [Angular](https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/angular.md)
- [React](https://surveyjs.io/survey-creator/examples/dynamically-modify-newly-added-questions/reactjs.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)