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Fetch the complete documentation index at: https://docs.conversion.ai/llms.txt

Use this file to discover all available pages before exploring further.

The Advanced tab of the form settings page contains JavaScript snippets for programmatically updating and retrieving data from your embedded Conversion form.
These settings only apply to embedded Conversion forms.
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Form fields

This table maps each form field (both displayed and hidden fields) to its field ID, which is used to identify it programmatically.

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Listen to form submissions

The following JavaScript snippet shows how to retrieve submitted form field values from an embedded Conversion form. 
// Optional helper to access fields by their readable names
const FORM_FIELDS = {
  email: "<FIELD_ID>",
  name: "<FIELD_ID>",
};

window.addEventListener("message", (event) => {
  if (event.data?.type === "conversion-forms" && event.data.data?.eventName === "submitted") {
    const fields = event.data.data.fields || {};
    console.log("Form submitted:", fields);

    // Example of pulling specific values:
    // console.log("Email:", fields[FORM_FIELDS.email]);
  }
});
Replace <FIELD_ID> with your form field ID’s
Steps to retrieve fields programmatically:
1

Define a helper object

Define a helper object to store the field IDs for each field. These IDs are used to reference field data in your code.
2

Wait for form submission

Add an event listener for the submitted event, which fires when the form has been submitted.
3

Read the submitted fields

Extract values from the fields object, which maps each field ID to its submitted value.

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Update field values

The following JavaScript snippet shows how to programmatically update field values on an embedded Conversion form. 
// Optional helper to access fields by their readable names
const FORM_FIELDS = {
  email: "<FIELD_ID>",
  name: "<FIELD_ID>",
};

// Ensure the form is ready to receive messages
window.addEventListener("message", (event) => {
  // Only handle messages from Conversion Forms
  if (event.data?.type !== "conversion-forms-ping" || event.origin !== "https://forms.conversion.ai") return;

  document.getElementById(<YOUR_FORM_ID>)?.contentWindow.postMessage({
    type: "conversion-forms",
    data: {
      eventName: "set-values",
      fields: {
        // Set a value
        // [FORM_FIELDS.email]: "user@example.com",
        // Remove a value
        // [FORM_FIELDS.name]: null
      }
    }
  }, "https://forms.conversion.ai");
});
Replace <YOUR_FORM_ID> with your form ID, and <FIELD_ID> with your form field ID’s
Steps to set field values programmatically:
1

Define a helper object

Define a helper object to store the field IDs for each field. These IDs are used to target specific fields when setting values.
2

Wait for the form to render

Add an event listener for the "conversion-forms-ping" event, which fires when the form is ready to receive messages.
3

Post a message to the iframe

Send a message to the form iframe with a fields object mapping each field ID to the value you want to set.
To clear a field, set its value to null