Get element at specified position - JavaScript

Digging deeper: Multiple elements

Unlike document.elementFromPoint which fetches the topmost element, document.elementsFromPoint(x, y) provides an array-like list of all elements at the specified (x, y) coordinates. This is handy when dealing with multiple overlays or nested HTML elements.

Example:

let elementsList = document.elementsFromPoint(100, 200);
console.log(elementsList); // Congrats! You've found all the hidden treasure at (100, 200).
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Remember: the (x, y) coordinates are relative to the viewport. Convert it using window.scrollX and window.scrollY if you are dealing with page coordinates.

Calibrating your aim

In real-time, be warned that dynamic layout changes and element overlapping due to user interaction can affect these methods. Hence, these methods might need repeated calls to ensure they consistently fetch the right elements.

elementFromPoint in real-time engagement

The use of elementFromPoint in real-time applications, like drag-and-drop UIs or interactive tooltips, boosts user interaction. Map mousemove events to this method to unveil the power of real-time element identification.

Code Snippet:

document.addEventListener('mousemove', (event) => {
  let el = document.elementFromPoint(event.clientX, event.clientY);
  // Ghostbusters dectecting ghosts in JavaScript dimension.
});
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CSS over JavaScript: Styling your fetched elements

When dealing with absolutely positioned elements, the understanding of CSS property z-index is vital as it affects the stacking order. Coupling elementFromPoint with CSS :hover and pointer-events properties can enhance the overall user experience.

Navigating uncharted territory: Handling edge cases

Checking the coordinates

Ensure your coordinates lie within the viewport to prevent null from being returned. Cross-check with window.innerWidth and window.innerHeight.

Dealing with overlays

For layered or nested elements, elementsFromPoint provides a list of elements at specified coordinates, helping you to select the right element based on your requirements.

Cross-browser support

Be aware of browser inconsistencies, especially with older ones or those with known compatibility issues. You might need a polyfill or an alternative solution for consistent results.