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How to get image size (height & width) using JavaScript?


Question

Are there any JavaScript or jQuery APIs or methods to get the dimensions of an image on the page?

2020/08/03
1
625
8/3/2020 8:36:53 PM


clientWidth and clientHeight are DOM properties that show the current in-browser size of the inner dimensions of a DOM element (excluding margin and border). So in the case of an IMG element, this will get the actual dimensions of the visible image.

var img = document.getElementById('imageid'); 
//or however you get a handle to the IMG
var width = img.clientWidth;
var height = img.clientHeight;
2009/08/21

Also (in addition to Rex and Ian's answers) there is:

imageElement.naturalHeight

and

imageElement.naturalWidth

These provide the height and width of the image file itself (rather than just the image element).

2017/08/08

If you are using jQuery and you are requesting image sizes you have to wait until they load or you will only get zeroes.

$(document).ready(function() {
    $("img").load(function() {
        alert($(this).height());
        alert($(this).width());
    });
});
2011/03/01

I think an update to these answers is useful because one of the best-voted replies suggests using clientWidth and clientHeight, which I think is now obsolete.

I have done some experiments with HTML5, to see which values actually get returned.

First of all, I used a program called Dash to get an overview of the image API. It states that height and width are the rendered height/width of the image and that naturalHeight and naturalWidth are the intrinsic height/width of the image (and are HTML5 only).

I used an image of a beautiful butterfly, from a file with height 300 and width 400. And this Javascript:

var img = document.getElementById("img1");

console.log(img.height,           img.width);
console.log(img.naturalHeight,    img.naturalWidth);
console.log($("#img1").height(),  $("#img1").width());

Then I used this HTML, with inline CSS for the height and width.

<img style="height:120px;width:150px;" id="img1" src="img/Butterfly.jpg" />

Results:

/*Image Element*/ height == 300         width == 400
           naturalHeight == 300  naturalWidth == 400
/*Jquery*/      height() == 120       width() == 150

/*Actual Rendered size*/    120                  150

I then changed the HTML to the following:

<img height="90" width="115" id="img1" src="img/Butterfly.jpg" />

i.e. using height and width attributes rather than inline styles

Results:

/*Image Element*/ height ==  90         width == 115
           naturalHeight == 300  naturalWidth == 400
/*Jquery*/      height() ==  90       width() == 115

/*Actual Rendered size*/     90                  115

I then changed the HTML to the following:

<img height="90" width="115" style="height:120px;width:150px;" id="img1" src="img/Butterfly.jpg" />

i.e. using both attributes and CSS, to see which takes precedence.

Results:

/*Image Element*/ height ==  90         width == 115
           naturalHeight == 300  naturalWidth == 400
/*Jquery*/      height() == 120       width() == 150

/*Actual Rendered size*/    120                  150
2017/08/08

Using JQuery you do this:

var imgWidth = $("#imgIDWhatever").width();
2009/03/08

Source: https://stackoverflow.com/questions/623172
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