Answer: Use the JavaScript clientWidth property You can simply use the JavaScript clientWidth property to get the current width and height of an image. This property will round the value to an integer.
The magnification equation states that m=hiho=−dido m = h i h o = − d i d o . We will use these steps, definitions, and equations to calculate the height of an image for a convex mirror in the following two examples.
I was searching a solution to get height and width of an image using JavaScript. I found many, but all those solutions only worked when the image was present in browser cache.
Finally I found a solution to get the image height and width even if the image does not exist in the browser cache:
<script type="text/javascript">
var imgHeight;
var imgWidth;
function findHHandWW() {
imgHeight = this.height;
imgWidth = this.width;
return true;
}
function showImage(imgPath) {
var myImage = new Image();
myImage.name = imgPath;
myImage.onload = findHHandWW;
myImage.src = imgPath;
}
</script>
Thanks,
Binod Suman
http://binodsuman.blogspot.com/2009/06/how-to-get-height-and-widht-of-image.html
Try this:
var curHeight;
var curWidth;
function getImgSize(imgSrc)
{
var newImg = new Image();
newImg.src = imgSrc;
curHeight = newImg.height;
curWidth = newImg.width;
}
You can use img.naturalWidth
and img.naturalHeight
to get real dimension of image in pixel
...but... wouldn't it be better to adjust the image size on the server side rather than transmitting the bytes to the browser and doing it there?
When I say adjust the image size, I don't mean set the height and width in the HTML image tag. If you do that, you are still shipping a large number of bytes from server to client. I mean, actually manipulate the image itself server side.
I have .NET C# code here that takes that approach, but there must be a php way to do it too: http://ifdefined.com/www/gallery.html
Also, by doing it server side, that opens up the possibility of doing the adjustment just once and then saving the adjusted image, which would be very fast.
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