---
id: 5ddb965c65d27e1512d44d9c
title: Step 3
challengeType: 0
dashedName: step-3
---
# --description--
Now we need to specify what should be done with the form when the user submits it by clicking the Calculate button.
Forms have an `onsubmit` event that can execute a function when the form is submitted.
For example, in `document.getElementById('my-form').onsubmit = processForm;`, the function `processForm` will run when the form is submitted.
Assign a function named `calculate` to the `onsubmit` event of your form.
You will create the `calculate` function later.
# --hints--
See description above for instructions.
```js
assert(
code
.replace(/\s/g, '')
.match(
/document\.getElementById\([\'\"\`]calorie\-form[\'\"\`]\)\.onsubmit\=calculate/
)
);
```
# --seed--
## --before-user-code--
```html