Asynchronous submission of adaptive forms asynchronous-submission-of-adaptive-forms

Traditionally, web forms are configured to submit synchronously. When users submit a form, they are redirected to an acknowledgement page, or in case of submission failure, an error page. However, modern web experiences like single page applications are gaining popularity where the web page remains static while client-server interaction happens in the background. You can now provide this experience with adaptive forms by configuring asynchronous submission. In this case, an adaptive form behaves like a single page application as the form does not reload or its URL does not change when the submitted form data is validated on the server.

Read on for details about asynchronous submission in adaptive forms.

Configure asynchronous submission configure

To configure asynchronous submission for an adaptive form:

How asynchronous submission works how-asynchronous-submission-works

AEM Forms provides out-of-the-box success and error handlers for form submissions. Handlers are client-side functions that execute based on the server response. When a form is submitted, the data is transmitted to the server for validation, which returns a response to the client with information about the success or error event for the submission. The information is passed as parameters to the relevant handler to execute the function.

In addition, form authors and developers can write rules at form level to override default handlers. For more information, see Override default handlers using rules.

Let us first review the server response for success and error events.

Server response for submission success event server-response-for-submission-success-event

The structure for the server response for submission success event is as follows:

{
  contentType : "<xmlschema or jsonschema>",
  data : "<dataXML or dataJson>" ,
  thankYouOption : <page/message>,
  thankYouContent : "<thank you page url/thank you message>"
}

The server response in case of successful form submission includes:

The success handler reads the server response and accordingly redirects to the configured page URL or displays a message.

Server response for submission error event server-response-for-submission-error-event

The structure for the server response for submission error event is as follows:

{
   errorCausedBy : "<CAPTCHA_VALIDATION or SERVER_SIDE_VALIDATION>",

   errors : [
               { "somExpression" : "<SOM Expression>",
                 "errorMessage"  : "<Error Message>"
               },
               ...
             ]
 }

The server response in case of error in form submission includes:

The errors handler reads the server response and accordingly displays the error message on the form.

Override default handlers using rules custom

Form developers and authors can write rules, at form level, in code editor to override default handlers. The server response for success and error events is exposed at form level, which developers can access using $event.data in rules.

Perform the following steps to write rules in code editor to handle success and error events.