Identifying the button which submitted a form in javascript

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Let's say we have a form that has multiple submit buttons:

<form>
  <input type="email" placeholder="Your email ..." />
  <button class="red" value="Red" type="submit">Red</button>
  <button class="green" value="Green" type="submit">Green</button>
</form>

We can call the submitter property of the submit event to determine the button used to send the form:

form.addEventListener('submit', e => {
  e.preventDefault()
  const {submitter} = e
  alert(`Form submitted with the ${submitter.value} button`)
})

Checkout the full working example below:

See the Pen
CSS User Select
by JS Craft (@js-craft)
on CodePen.

You may be also interested to checkout this example for appending an array with the FormData Api and how to have a submit button placed outside of its html form.

šŸ“– Neural networks for Javascript developers

The Neural Networks for JavaScript developers book is almost ready! Learn the basics of AI with TensorFlowJs examples. Join now the presale and get a 15$ coupon off the launching price!


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