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Home Web Front-end JS Tutorial ## How to Use jQuery to Check if an Element is Visible in the Viewport?

## How to Use jQuery to Check if an Element is Visible in the Viewport?

Oct 24, 2024 pm 11:12 PM

## How to Use jQuery to Check if an Element is Visible in the Viewport?

jQuery Check if Element is Visible in Viewport

In the realm of web development, it's often necessary to determine whether an element is within the visible area of the browser window. This can be particularly crucial when deciding what content to display and how to interact with it.

One popular jQuery plugin that caters to this need is jquery-visible, which provides a convenient method for checking an element's visibility within the viewport. However, its usage can be slightly confusing.

To utilize the jquery-visible plugin, you can define a custom jQuery function that leverages its capabilities. This function can determine if an element is in the viewport, regardless of the current window scroll position.

Here's a sample implementation of such a function:

<code class="javascript">$.fn.isInViewport = function() {
  var elementTop = $(this).offset().top;
  var elementBottom = elementTop + $(this).outerHeight();

  var viewportTop = $(window).scrollTop();
  var viewportBottom = viewportTop + $(window).height();

  return elementBottom > viewportTop && elementTop < viewportBottom;
};</code>

To use this function, you can instantiate it on the desired element, as seen below:

<code class="javascript">$(window).on('resize scroll', function() {
  if ($('#Something').isInViewport()) {
    // Perform actions when the element is visible
  } else {
    // Execute alternative actions when the element is hidden
  }
});</code>

However, it's important to note that this function only considers an element's vertical position within the viewport. It does not account for horizontal visibility, which may also be relevant in certain scenarios.

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