with-multiple-checkbox.md

description
How to integrate Checkbox with Web3Forms Properly

With Multiple Checkbox

There are some confusions on how multiple checkboxes works and how to to integrate it with Web3Forms.

If you simply added a checkbox like this and sent the data to a regular form action, check would return on or off based on whether the user checked or not.

<input type="checkbox" name="check">

However, if you need to add a value to your checkbox, you need to define it like this:

<input type="checkbox" name="check" value="checked">

Now, this would return check: checked

Multiple Checkboxes

You need to add the same name with different values for multiple checkboxes. See:

<label>Interests</label>
<input type="checkbox" id="coding" name="interest" value="coding" />
<input type="checkbox" id="music" name="interest" value="music" />

Web3Forms will then automatically parse them to be comma-separated like this:

Interests
coding,music

Multiple Checkbox with Javascript

If you are using javascript, you have to manually stringify multiple data like this before sending the request to Web3Forms API. See example code:

const formData = new FormData(form);
const interests = [];
 
form.querySelectorAll('input[name="interest"]:checked').forEach((checkbox) => {
    interests.push(checkbox.value);
});
  
formData.set('interest', interests);

This will set the checkbox as you intended.

Live Demo

{% embed url="https://codepen.io/surjithctly/pen/eYobEbO" %} View Codepen {% endembed %}