---
title: Calculator Forms for E-commerce
product: Form Library
description: Learn how to create calculator forms that instantly compute the total order costs based on predefined item prices and selected quantities. Build dynamic product order forms with item images and real-time calculations. Try out this free code example on JavaScript.
framework: React
source: https://surveyjs.io/form-library/examples/how-to-create-calculator-form/reactjs
index: https://surveyjs.io/form-library/examples/overview.md
---

# Calculator Forms for E-commerce (React)

Calculator forms are interactive e-forms that incorporate expression-based calculations into their functionality. They allow respondents to input data or make selections that are then processed in real-time to produce calculated results. For instance, a calculator form on a grocery shop website helps buyers determine the total cost of selected items. This demo shows how to build a calculator form that contains a catalog of item images with names and costs (vegetables in our example). Once a user selects an item they want to purchase, a related dropdown appears, allowing them to select the quantity. The total cost of all selected items is displayed at the bottom of the form and automatically updates with each modification.

## Arrange Elements on the Form

To build the layout described above, use [Panel](/form-library/examples/set-properties-on-multiple-questions-using-panel/) elements with an [Image Picker](/form-library/examples/image-picker-question/) and a [Dropdown](/form-library/examples/create-dropdown-menu-in-javascript/) questions inside. Each Image Picker should contain only one image and enable the [`multiSelect`](https://surveyjs.io/form-library/documentation/api-reference/image-picker-question-model#multiSelect) property to let respondents both select and unselect the image. Each Dropdown should become visible only when respondents select an image to which it is attached. Use the [`visibleIf`](https://surveyjs.io/form-library/documentation/api-reference/dropdown-menu-model#visibleIf) property to control the visibility.

## Perform Calculations

To calculate the price of each product, add an [Expression](/form-library/examples/expression-question-for-dynamic-form-calculations/) question to each Panel. Use this question multiply the price of one kilogram by the selected number of kilograms. Because this question will only be used in calculations, set its [`visible`](https://surveyjs.io/form-library/documentation/api-reference/expression-model#visible) property to `false`.

To compute the total price, create a [calculated value](https://surveyjs.io/form-library/documentation/design-survey/conditional-logic#calculated-values) that adds up all expression values. You can use an [HTML](/form-library/examples/questiontype-html/) question to display the calculated value. To exclude unselected products from the final calculation, set `SurveyModel`'s [`clearInvisibleValues`](https://surveyjs.io/form-library/documentation/api-reference/survey-data-model#clearInvisibleValues) property to `"onHidden"`.

Refer to the survey JSON schema (the `json.js` file) for a code example.

## Files

### `public/index.html`

```html
<div id="surveyElement" style="position: absolute; top: 0; left: 0; right: 0; bottom: 0; min-height: 100%; height:100%"></div>
```

### `src/SurveyComponent.jsx`

```js
import React from "react";
import { Model } from "survey-core";
import { Survey } from "survey-react-ui";
import "survey-core/survey-core.min.css";
import "./index.css";
import { json } from "./json";

function SurveyComponent() {
    const survey = new Model(json);
    survey.onComplete.add((sender, options) => {
        console.log(JSON.stringify(sender.data, null, 3));
    });
    return (<Survey model={survey} />);
}

export default SurveyComponent;
```

### `src/index.css`

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

### `src/index.js`

```js
import React from "react";
import { createRoot } from "react-dom/client";
import SurveyComponent from "./SurveyComponent";

const root = createRoot(document.getElementById("surveyElement"));
root.render(<SurveyComponent />);
```

### `src/json.js`

```js
export const json = {
  "pages": [
    {
      "name": "page1",
      "title": "Vegetable Store",
      "elements": [
        {
          "type": "panel",
          "name": "cabbagePanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "cabbageImage",
              "title": "Cabbage",
              "description": "$2.50",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=d744127b-26e1-4b41-80ac-955b2a383621"
                }
              ],
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageHeight": 200,
              "maxImageWidth": 1000,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "cabbagePrice",
              "visible": false,
              "expression": "{cabbageWeight} * 2.50"
            },
            {
              "type": "dropdown",
              "name": "cabbageWeight",
              "visibleIf": "{cabbageImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "carrotPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "carrotImage",
              "title": "Carrot",
              "description": "$1.20",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=aaca9982-af66-4840-869e-fc2fc0b34bde"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "carrotPrice",
              "visible": false,
              "expression": "{carrotWeight} * 1.2"
            },
            {
              "type": "dropdown",
              "name": "carrotWeight",
              "visibleIf": "{carrotImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "pumpkinPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "pumpkinImage",
              "title": "Pumpkin",
              "description": "$3.00",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=26c5abf2-7eb2-4437-963e-03d49d8822d7"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "pumpkinPrice",
              "visible": false,
              "expression": "{pumpkinWeight} * 3.00"
            },
            {
              "type": "dropdown",
              "name": "pumpkinWeight",
              "visibleIf": "{pumpkinImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "pepperPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "pepperImage",
              "title": "Pepper",
              "description": "$4.50",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=68135162-1d85-4f5f-ba7b-3130274dc663"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "pepperPrice",
              "visible": false,
              "expression": "{pepperWeight} * 4.5"
            },
            {
              "type": "dropdown",
              "name": "pepperWeight",
              "visibleIf": "{pepperImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "cornPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "cornImage",
              "title": "Corn",
              "description": "$1.50",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=44c0fbcb-cf53-451f-a8f2-864dd7213d8e"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "cornPrice",
              "visible": false,
              "expression": "{cornWeight} * 1.5"
            },
            {
              "type": "dropdown",
              "name": "cornWeight",
              "visibleIf": "{cornImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "potatoPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "potatoImage",
              "title": "Potato",
              "description": "$0.90",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=51d53a3a-4d94-4b6e-b2fa-a48e7e7b44d4"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "potatoPrice",
              "visible": false,
              "expression": "{potatoWeight} * 0.9"
            },
            {
              "type": "dropdown",
              "name": "potatoWeight",
              "visibleIf": "{potatoImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "tomatoPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "tomatoImage",
              "title": "Tomato",
              "description": "$3.80",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=4c947e02-393b-4d18-b95b-77909de7ddeb"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "tomatoPrice",
              "visible": false,
              "expression": "{tomatoWeight} * 3.8"
            },
            {
              "type": "dropdown",
              "name": "tomatoWeight",
              "visibleIf": "{tomatoImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "panel",
          "name": "lemonPanel",
          "elements": [
            {
              "type": "imagepicker",
              "name": "lemonImage",
              "title": "Lemon",
              "description": "$2.20",
              "choices": [
                {
                  "value": "image",
                  "imageLink": "https://api.surveyjs.io/private/Surveys/files?name=a6de77e1-65de-4af5-bf09-3b8125bc140b"
                }
              ],
              "colCount": 1,
              "imageFit": "cover",
              "minImageHeight": 200,
              "maxImageWidth": 1000,
              "maxImageHeight": 200,
              "multiSelect": true
            },
            {
              "type": "expression",
              "name": "lemonPrice",
              "visible": false,
              "expression": "{lemonWeight} * 2.20"
            },
            {
              "type": "dropdown",
              "name": "lemonWeight",
              "visibleIf": "{lemonImage} = ['image']",
              "titleLocation": "hidden",
              "choices": [ 1, 2, 3, 4, 5 ],
              "placeholder": "Select weight (kg)",
              "allowClear": false
            }
          ],
          "startWithNewLine": false,
          "minWidth": "320px"
        },
        {
          "type": "html",
          "name": "totalPrice",
          "html": "<h4 style=\"font-weight:bold;margin-top:24px;margin-bottom:16px;text-align:right\">Total: ${total}</h4>"
        }
      ]
    }
  ],
  "calculatedValues": [
    {
      "name": "total",
      "expression": "{cabbagePrice} + {carrotPrice} + {pumpkinPrice} + {pepperPrice} + {cornPrice} + {tomatoPrice} + {potatoPrice} + {lemonPrice}",
      "includeIntoResult": true
    }
  ],
  "questionTitleLocation": "bottom",
  "clearInvisibleValues": "onHidden",
  "completeText": "PLACE ORDER",
  "widthMode": "responsive"
};
```

### `src/theme.js`

```js
export const themeJson = {};
```

### `package.json`

```json
{
  "dependencies": {
    "react": "latest",
    "react-dom": "latest",
    "survey-core": "latest",
    "survey-react-ui": "latest"
  },
  "devDependencies": {
    "react-scripts": "latest"
  }
}
```

## Other Frameworks

- [Angular](https://surveyjs.io/form-library/examples/how-to-create-calculator-form/angular.md)
- [Vue 3](https://surveyjs.io/form-library/examples/how-to-create-calculator-form/vue3js.md)
- [jQuery](https://surveyjs.io/form-library/examples/how-to-create-calculator-form/jquery.md)
- [Vanilla JS](https://surveyjs.io/form-library/examples/how-to-create-calculator-form/vanillajs.md)