Skip to content

loadImage

Load a given image.

Usage

js
import { 
loadImage
} from '@studiometa/js-toolkit/utils';
const
src
= '/path/to/my/image.jpg';
const {
event
,
element
} = await
loadImage
(
src
);
if (
event
.
type
=== 'error') {
console
.
log
(`Failed to load ${
src
}: ${
event
.message}`);
} else {
console
.
log
(`${
src
} has been loaded!`);
}

Parameters

  • src (string): the source URL to load
  • options ({ appendTo?: HTMLElement }): configure the loader behavior
    • options.appendTo (HTMLElement): append the created element to a DOM element

Return value

  • Promise<{ event: Event, element: HTMLelement }>: a promise resolving to an object containing both the load event object and the created element

Examples

Avoid loading the same image multiple times

You can combine the loadImage function with the memo function to add an in memory cache layer. This will make the generated function always return the same generated element.

js
import { 
loadImage
,
memo
} from '@studiometa/js-toolkit';
const
loadImageWithCache
=
memo
(
loadImage
);
const
promise
=
loadImageWithCache
('image.webp');
const
promise2
=
loadImageWithCache
('image.webp');
console
.
assert
(
promise
===
promise2
); // true
const [
result
,
result2
] = await
Promise
.
all
([
promise
,
promise2
]);
console
.
assert
(
result
===
result2
);

Cache invalidation

Be aware that the memo function will use a simple arguments.join('') call to generate the cache key, thus ignoring any change in the options parameter of the loadImage function.

js
const 
loadImageWithCache
= memo(loadImage);
const
result
= await
loadImageWithCache
('image.webp', {
appendTo
:
document
.
head
});
const
result2
= await
loadImageWithCache
('image.webp', {
appendTo
:
document
.
body
});
console
.
assert
(
result
===
result2
); // true
console
.
log
(
result
.element.parentElement); // document.head
console
.
log
(
result2
.element.parentElement); // document.head

MIT Licensed