How to preload an image in JavaScript or HTML code?
Often times, we need to “preload” an image into browser’s cache for performance concern. For instance, we have a mouseover event and the image needs to be update without any delay. This “Preloading” stuff can be achieved in two ways , either JavaScript or HTML code.
Javascript
We can “preload” an image with the following Javascript.
<script type="text/javascript">
if (document.images) {
imgPreload = new Image();
imgPreload.src = "/preload-image.jpg";
}
</script>
We also can “preload” few images with the following Javascript.
<script type="text/javascript">
if (document.images) {
imgPreload1 = new Image();
imgPreload1.src = "/preload-image1.jpg";
imgPreload2 = new Image();
imgPreload2.src = "/Preload-image2.jpg";
}
</script>
HTML
What about Javascript is disabled? Here is another dirty trick in HTML. Just load an image and hide it by specified the width and height equal = 1 :), who bother?
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Another way to preload images is to use CSS. This may be benificial as javacsript is not enabled on all browsers. For examples of how to do this visit: http://www.prismgraphicdesign.co.uk/blog/?p=12
Thanks for sharing your CSS trick, it’s really a new way to me 🙂
very cool & simple tip, thank you very much for sharing.
Thank