How Can I Find and Manage the Focused DOM Element in JavaScript?

Finding the DOM Element with Focus

When developing interactive web applications, determining which element holds the focus is crucial for various functionalities, such as navigation and form validation. In JavaScript, identifying the focused element is achieved using document.activeElement.

To retrieve the focused element, simply access document.activeElement, which returns the DOM element that currently has input focus. This method is widely supported across major browsers.

Emulating Focus Detection in Legacy Browsers

In older browsers that don't support document.activeElement, you can approximate focus detection by implementing event handlers for focus and blur events. For each form field, add a focus event handler to update a global variable with the ID of the focused field. Additionally, add a blur handler that clears the variable when the focused field loses focus.

Removing Focus

If necessary, you can remove focus from an active element using blur. Calling document.activeElement.blur() removes focus from the active element and sets it to the body element.

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