From 392dfd024c505f5ae1bbb2f0d3e0793c251a1f35 Mon Sep 17 00:00:00 2001 From: Sam Potts Date: Wed, 13 Jun 2018 00:02:55 +1000 Subject: Utils broken down into seperate files and exports --- src/js/utils/loadImage.js | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 src/js/utils/loadImage.js (limited to 'src/js/utils/loadImage.js') diff --git a/src/js/utils/loadImage.js b/src/js/utils/loadImage.js new file mode 100644 index 00000000..8acd2496 --- /dev/null +++ b/src/js/utils/loadImage.js @@ -0,0 +1,19 @@ +// ========================================================================== +// Load image avoiding xhr/fetch CORS issues +// Server status can't be obtained this way unfortunately, so this uses "naturalWidth" to determine if the image has loaded +// By default it checks if it is at least 1px, but you can add a second argument to change this +// ========================================================================== + +export default function loadImage(src, minWidth = 1) { + return new Promise((resolve, reject) => { + const image = new Image(); + + const handler = () => { + delete image.onload; + delete image.onerror; + (image.naturalWidth >= minWidth ? resolve : reject)(image); + }; + + Object.assign(image, { onload: handler, onerror: handler, src }); + }); +} -- cgit v1.2.3