Adjust the height of the HTML overlay to span the entire visible page

I have a website that utilizes AJAX to load content dynamically. To enhance user experience, I implemented an overlay with a loading indicator during the loading process using jQuery and the jQuery BlockUI plugin.

When invoking $(element).block(), everything functions as expected. However, the issue arises when additional content is loaded onto the page - the overlay shifts down along with it, resulting in a less-than-ideal appearance. My goal is to have the overlay cover the entire visible area of the page right from the start. One solution would be to set a large height value for the overlay like so:


$(myElement).block({
        overlayCSS: {
            height: '10000px'
        }
 });

Unfortunately, this approach introduces a scrollbar. How can I prevent this and ensure that the overlay remains the perfect height to cover the visible page without altering its size?

htmlcssdomjquery-ui

Answer №1

Consider using the position: fixed; property instead of position: absolute. By doing so, you can ensure that the overlay remains in place even while scrolling.

Answer №2

When it comes to XHTML, the html and body elements don't possess the same automatic magic as in HTML. Unlike in HTML, the body element does not automatically fill the viewport (window) - its size is limited to the height of its contents.

If you want an element to occupy the entire window, you need to ensure that both the html and body elements expand to cover the full window:

html, body { height: 100%; }

After setting the heights for the html and body elements, you can then apply height: 100%; to any element within the body to make it span the full height of the window.

Answer №3

After some trial and error, I finally got the following code to work as intended:

$("body").block({
  message: '<h2>Loading...</h2>',
  overlayCSS: {
    position: 'absolute',
    top: '0',
    bottom: '0',
    left: '0',
    right: '0'
  }
});

body {
  color: #004A6E;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

I found inspiration from this helpful post: Make div 100% height of browser window I did have to make one adjustment by including both left and right properties. Initially, my overlay was only covering half of the screen.

Answer №4

Change the position property to absolute and set the height to 100%.

Answer №5

I have prepared a comprehensive example for you to use in your application. Simply implement it and hide it once the ajax request is completed.

Follow this link to view the example on JSFiddle: here!

<div class="overlay"></div>
<div id="container">
    Insert any content you desire here, you can even remove this container entirely.
<div>

Answer №6

It worked like a charm for me! I simply switched out absolute with fixed.

function displayPopup() {
  var element = document.getElementById('popupdiv');
  if (element) {
    element.style.display = 'block';
  }
  return true;
}

displayPopup();
div.popupdiv {
  background-color: #000000;
  opacity: 0.6;
  filter: alpha(opacity=60);
  z-index: 2000;
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 200%;
  display: none;
}
<div class="popupdiv" id="popupdiv"></div>

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