Detecting Background Image Load Status
Aspiring to trigger some code upon the successful loading of a body tag's background image? Introducing a solution to this elusive problem:
The initial approach using $().load() fails due to its limitation to DOM elements, excluding background images. Instead, we employ the following strategy:
- Create a new image element and set its src attribute to match the target background image's URL.
- Utilize the 'load' event listener to capture the completion of image loading.
In jQuery, this technique translates to:
$('<img/>').attr('src', 'http://picture.de/image.png').on('load', function() {
$(this).remove(); // Prevent memory leaks suggested by @benweet
$('body').css('background-image', 'url(http://picture.de/image.png)');
});
Implementing this logic in Vanilla JavaScript:
var src = 'http://picture.de/image.png';
var image = new Image();
image.addEventListener('load', function() {
body.style.backgroundImage = 'url(' + src + ')';
});
image.src = src;
Elevate your code by encapsulating this functionality into a convenient function that yields a promise:
function load(src) {
return new Promise((resolve, reject) => {
const image = new Image();
image.addEventListener('load', resolve);
image.addEventListener('error', reject);
image.src = src;
});
}
const image = 'http://placekitten.com/200/300';
load(image).then(() => {
body.style.backgroundImage = `url(${image})`;
});The above is the detailed content of How Can I Detect When a Background Image Has Loaded?. For more information, please follow other related articles on the PHP Chinese website!
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