Скачать или смотреть Solving the Problem of Cursor Caret Movement After AJAX Requests in ADF

Discover how to maintain a consistent cursor location while managing button states in JSF applications with AJAX requests.
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Keeping Cursor Caret in Place After AJAX Requests in ADF

When working with Oracle ADF and JSF, maintaining an intuitive user experience is crucial, especially when it comes to input fields and their associated buttons. A common issue arises when using AJAX to dynamically update a button based on user input—specifically, the behavior of the cursor caret jumping back to the beginning of an input field after a request. In this post, we will explore the problem, the solutions attempted, and the ultimate fix that worked for this scenario.

The Problem: Cursor Caret Movement

Imagine you have a form with input fields for the first and last names, alongside a submit button. The goal is to disable the button until both fields are filled. While using AJAX to provide feedback and update the button state efficiently, you may notice that upon typing in an input field, the cursor reset to the start of the field. This interrupts the flow for users as they must continuously reposition their caret to continue typing.

Initial Approach

Partial Triggers: The first method involved using partial triggers on the button along with an EL expression to determine the button’s disabled state. Autocomplete was set to true on input fields to ensure immediate validation.

Sample Code:

[[See Video to Reveal this Text or Code Snippet]]

This approach worked for disabling and enabling the button, but the button would only be enabled after the focus left the input field.

AJAX KeyPress Call: To address the focus issue, an AJAX call on the keyPress event was attempted, which refreshed the button upon each keystroke.

Sample Code:

[[See Video to Reveal this Text or Code Snippet]]

While this method achieved immediate feedback, it inadvertently caused the cursor caret to reset after each character was typed due to the entire button being refreshed.

The Solution: Upgrade ADF and Change Event Type

After experimenting with several methods, the solution that finally worked involved two steps:

Upgrading ADF: The issue with the cursor caret was identified as a bug in version 12.2.1.3. Upgrading to version 12.2.1.4 resolved this behavior, ensuring that the cursor no longer reverted to the start after an AJAX request.

Changing the AJAX Event: The key to solving the intermittent button disable state, while also keeping the cursor in place, was to switch the AJAX event from keyPress to keyUp.

By using the keyUp event, the button refresh was triggered after the user had completed their input for that keystroke, thus maintaining the caret position.

Final Working Code:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Navigating the nuances of AJAX in ADF can be challenging, especially when user experience seems compromised. By understanding the root of the problem—in this case, the cursor caret movement—and intelligently choosing the right events in conjunction with platform upgrades, you can create a more seamless and enjoyable experience for users.

As you work with AJAX in ADF, remember to test the versions you are using and be willing to explore alternative approaches! If you've faced similar issues or have additional insights, feel free to share in the comments below!