How to Run JavaScript After a Kadence Form is Successfully Submitted (On Event)

You can run custom JavaScript immediately after someone submits a Kadence Form on your site. Kadence Blocks makes this possible by providing JavaScript events that fire only when the form is successfully submitted. The event you use depends on the type of form block you are working with.

For example, you might want to do the following:

Track submissions in Google Analytics or Google Tag Manager
Trigger an animation or send the data to another application
Hide or show HTML elements

Form (Adv) Block Submission Event

Event name: kb-advanced-form-success

Example:

document.body.addEventListener('kb-advanced-form-success', function (event) {
    console.log('Advanced Form submitted!', event.detail);
    alert('Thank you for submitting the advanced form!');
});

Targeting a Specific Advanced Form

You can make your script run only for one specific form by using the HTML Anchor setting in the block.

In the block settings, go to Advanced > HTML Anchor and set a unique anchor.
Example: myContact

JavaScript Example:

document.body.addEventListener('kb-advanced-form-success', function(event) {
  const uniqueId = 'wp-block-kadence-advanced-form' + event.detail.uniqueId;
  const formDiv = document.querySelector('#myContact');
  if (formDiv.classList.contains(uniqueId)) {
    console.log("This form");
  }
});

How it works:

The HTML Anchor you set (e.g., myContact) becomes the form’s ID in the page HTML.
The script checks if the submitted form’s unique ID matches that element before running your custom code.

Form Block Submission Event

Event name: kb-form-success

Example:

document.body.addEventListener('kb-form-success', function (event) {
    console.log('Form submitted!', event.detail);
    alert('Thank you for submitting the form!');
});

Targeting a Specific Form Block

You can also run your script for only one specific Form block by giving it an HTML Anchor.

In the block settings, set the HTML Anchor to something unique.
Example: myContact
Use this JavaScript:

 document.body.addEventListener('kb-form-success', function (event) {
   const form = document.querySelector('.kadence-form-' + event.detail);
   if (form && form.id === 'myContact') {
      console.log('form sent');
   }
});

How it works: