Practical task: implement the logic to unlock buttons after scrolling a container to the end (JavaScript).

To implement the logic of unlocking buttons after scrolling the container to the end, you can use the scroll event and check whether the end of the scroll has been reached.

Example in JavaScript:

const container = document.getElementById('scrollable-container');
const buttons = document.querySelectorAll('.locked-button');

container.addEventListener('scroll', () => {
  // Check if the end of the scroll has been reached
  if (container.scrollTop + container.clientHeight >= container.scrollHeight) {
    // Unlock the buttons
    buttons.forEach(button => button.disabled = false);
  }
});

Here:

• scrollTop — the current vertical scroll position of the container
• clientHeight — the visible height of the container
• scrollHeight — the total height of the content

When the sum of scrollTop and clientHeight is equal to or greater than scrollHeight, it means the user has scrolled to the end, and the buttons can be unlocked.