JS can't read image width

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I'm doing basic exercises for students in JS and one of them requires to change the image size like 50% and back on button click.

I use the following HTML:

        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link href="style.css" rel="stylesheet" type="text/css"/>
        <script src="script.js" type="text/javascript"></script>
            <img id="image" src="krogan.png" alt="krogan">
            <input type="button" value="Change size">

with following CSS

button {
    display: block;

img {
    display: block;
    width: 256px;
    height: 256px;

and when I try to get current image width using this JS code

window.onload=function() {

I get an empty message instead of actually set width. What am I doing wrong?

You can use following:-


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You are accessing the CSS width, these are not set.

What you want is the real width, you can get it from the clientWidth property:


Same works for clientHeight.

The client width or height are the real sizes that are being displayed by the browser to the user.

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I would suggest you assign the width using JavaScript and remove it from the CSS file. Then you can manipulate it in JavaScript like this:

document.getElementById('image').css('width') == '256px';

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  • there is no style property on that img tag ... - did you want to get the Computed CSS Style width, or the actual natural Image Width?