We Keep Coding

Image object width property unavailable [duplicate]

Is there a JavaScript or jQuery API or method to get the dimensions of an image on the page?

You can programmatically get the image and check the dimensions using JavaScript...
const img = new Image();
img.onload = function() {
alert(this.width + 'x' + this.height);
}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';
This can be useful if the image is not a part of the markup.

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;

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).

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());
});
});

Using clientWidth and clientHeight is, I think, 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 code:
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

Using jQuery, you do this:
var imgWidth = $("#imgIDWhatever").width();

The thing all other have forgot is that you can’t check image size before it loads. When the author checks all of posted methods it will work probably only on localhost.
Since jQuery could be used here, remember that the 'ready' event is fired before images are loaded. $('#xxx').width() and .height() should be fired in the onload event or later.

You can only really do this using a callback of the load event as the size of the image is not known until it has actually finished loading. Something like the code below...
var imgTesting = new Image();
function CreateDelegate(contextObject, delegateMethod)
{
return function()
{
return delegateMethod.apply(contextObject, arguments);
}
}
function imgTesting_onload()
{
alert(this.width + " by " + this.height);
}
imgTesting.onload = CreateDelegate(imgTesting, imgTesting_onload);
imgTesting.src = 'yourimage.jpg';

Let's combine everything we learned here into one simple function (imageDimensions()). It uses promises.
// helper to get dimensions of an image
const imageDimensions = file =>
new Promise((resolve, reject) => {
const img = new Image()
// the following handler will fire after a successful loading of the image
img.onload = () => {
const { naturalWidth: width, naturalHeight: height } = img
resolve({ width, height })
}
// and this handler will fire if there was an error with the image (like if it's not really an image or a corrupted one)
img.onerror = () => {
reject('There was some problem with the image.')
}
img.src = URL.createObjectURL(file)
})
// here's how to use the helper
const getInfo = async ({ target: { files } }) => {
const [file] = files
try {
const dimensions = await imageDimensions(file)
console.info(dimensions)
} catch(error) {
console.error(error)
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/7.0.0-beta.3/babel.min.js"></script>
Select an image:
<input
type="file"
onchange="getInfo(event)"
/>
<br />
<small>It works offline.</small>

To get the natural height and width:
document.querySelector("img").naturalHeight;
document.querySelector("img").naturalWidth;
<img src="img.png">
And if you want to get style height and width:
document.querySelector("img").offsetHeight;
document.querySelector("img").offsetWidth;

Assuming, we want to get image dimensions of <img id="an-img" src"...">
// Query after all the elements on the page have loaded.
// Or, use `onload` on a particular element to check if it is loaded.
document.addEventListener('DOMContentLoaded', function () {
var el = document.getElementById("an-img");
console.log({
"naturalWidth": el.naturalWidth, // Only on HTMLImageElement
"naturalHeight": el.naturalHeight, // Only on HTMLImageElement
"offsetWidth": el.offsetWidth,
"offsetHeight": el.offsetHeight
});
})
Natural Dimensions
el.naturalWidth and el.naturalHeight will get us the natural dimensions, the dimensions of the image file.
Layout Dimensions
el.offsetWidth and el.offsetHeight will get us the dimensions at which the element is rendered on the document.

This answer was exactly what I was looking for (in jQuery):
var imageNaturalWidth = $('image-selector').prop('naturalWidth');
var imageNaturalHeight = $('image-selector').prop('naturalHeight');

I think I improved the source code to be able to let the image load before trying to find out its properties. Otherwise, it will display '0 * 0', because the next statement would have been called before the file was loaded into the browser. It requires jQuery...
function getImgSize(imgSrc) {
var newImg = new Image();
newImg.src = imgSrc;
var height = newImg.height;
var width = newImg.width;
p = $(newImg).ready(function() {
return {width: newImg.width, height: newImg.height};
});
alert (p[0]['width'] + " " + p[0]['height']);
}

I thought this might be helpful to some who are using JavaScript and/or TypeScript in 2019.
I found the following, as some have suggested, to be incorrect:
let img = new Image();
img.onload = function() {
console.log(this.width, this.height) // Error: undefined is not an object
};
img.src = "http://example.com/myimage.jpg";
This is correct:
let img = new Image();
img.onload = function() {
console.log(img.width, img.height)
};
img.src = "http://example.com/myimage.jpg";
Conclusion:
Use img, not this, in the onload function.

With the jQuery library-
Use .width() and .height().
More in jQuery width and jQuery heigth.
Example Code-
$(document).ready(function(){
$("button").click(function()
{
alert("Width of image: " + $("#img_exmpl").width());
alert("Height of image: " + $("#img_exmpl").height());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<img id="img_exmpl" src="http://images.all-free-download.com/images/graphicthumb/beauty_of_nature_9_210287.jpg">
<button>Display dimensions of img</button>

Before using the real image size, you should load the source image. If you use the jQuery framework, you can get the real image size in a simple way.
$("ImageID").load(function(){
console.log($(this).width() + "x" + $(this).height())
})

A jQuery answer:
$height = $('#image_id').height();
$width = $('#image_id').width();

My two cents in jQuery
Disclaimer: This does not necessarily answer this question, but broadens our capabilities. It was tested and working in jQuery 3.3.1
Let’s consider:
You have the image URL/path and you want to get the image width and height without rendering it on the DOM,
Before rendering image on the DOM, you need to set the offsetParent node or image div wrapper element to the image width and height, to create a fluid wrapper for different image sizes, i.e., when clicking a button to view image on a modal/lightbox
This is how I will do it:
// image path
const imageUrl = '/path/to/your/image.jpg'
// Create dummy image to get real width and height
$('<img alt="" src="">').attr("src", imageUrl).on('load', function(){
const realWidth = this.width;
const realHeight = this.height;
alert(`Original width: ${realWidth}, Original height: ${realHeight}`);
})

Recently I had the same issue for an error in the flex slider. The first image's height was set smaller due to the loading delay. I tried the following method for resolving that issue and it's worked.
// Create an image with a reference id. Id shall
// be used for removing it from the DOM later.
var tempImg = $('<img id="testImage" />');
// If you want to get the height with respect to any specific width you set.
// I used window width here.
tempImg.css('width', window.innerWidth);
tempImg[0].onload = function () {
$(this).css('height', 'auto').css('display', 'none');
var imgHeight = $(this).height();
// Remove it if you don't want this image anymore.
$('#testImage').remove();
}
// Append to body
$('body').append(tempImg);
// Set an image URL. I am using an image which I got from Google.
tempImg[0].src ='http://aspo.org/wp-content/uploads/strips.jpg';
This will give you the height with respect to the width you set rather than original width or Zero.

Nicky De Maeyer asked for a background picture; I simply get it from the CSS content and replace the "url()":
var div = $('#my-bg-div');
var url = div.css('background-image').replace(/^url\(\'?(.*)\'?\)$/, '$1');
var img = new Image();
img.src = url;
console.log('img:', img.width + 'x' + img.height); // Zero, image not yet loaded
console.log('div:', div.width() + 'x' + div.height());
img.onload = function() {
console.log('img:', img.width + 'x' + img.height, (img.width/div.width()));
}

You can apply the onload handler property when the page loads in JavaScript or jQuery like this:
$(document).ready(function(){
var width = img.clientWidth;
var height = img.clientHeight;
});

This is an alternative answer for Node.js. That isn't likely what the OP meant, but it could come in handy and seems to be in the scope of the question.
This is a solution with Node.js, and the example uses the Next.js framework, but it would work with any Node.js framework. It uses the probe-image-size NPM package to resolve the image attributes from the server side.
Example use case: I used the below code to resolve the size of an image from an Airtable Automation script, which calls my own analyzeImage API and returns the image's props.
import {
NextApiRequest,
NextApiResponse,
} from 'next';
import probe from 'probe-image-size';
export const analyzeImage = async (req: NextApiRequest, res: NextApiResponse): Promise<void> => {
try {
const result = await probe('http://www.google.com/intl/en_ALL/images/logo.gif');
res.json(result);
} catch (e) {
res.json({
error: true,
message: process.env.NODE_ENV === 'production' ? undefined : e.message,
});
}
};
export default analyzeImage;
Yields:
{
"width": 276,
"height": 110,
"type": "gif",
"mime": "image/gif",
"wUnits": "px",
"hUnits": "px",
"length": 8558,
"url": "http://www.google.com/intl/en_ALL/images/logo.gif"
}

In my case, I have a File type (that is guaranteed to be an image), and I want the image dimensions without loading it on the DOM.
General strategy: Convert File to ArrayBuffer → Convert ArrayBuffer to a base64 string → use this as the image source with an Image class → use naturalHeight & naturalWidth to get dimensions.
const fr = new FileReader();
fr.readAsArrayBuffer(image); // Image the 'File' object
fr.onload = () => {
const arrayBuffer: ArrayBuffer = fr.result as ArrayBuffer;
// Convert to base64. String.fromCharCode can hit a stack overflow error if you pass
// the entire arrayBuffer in, and iteration gets around this
let binary = '';
const bytes = new Uint8Array(arrayBuffer);
bytes.forEach(b => binary += String.fromCharCode(b));
const base64Data = window.btoa(binary);
// Create an image object. Note, a default width/height MUST be given to the constructor (per
// the documentation) or naturalWidth/Height will always return 0.
const imageObj = new Image(100, 100);
imageObj.src = `data:${image.type};base64,${base64Data}`;
imageObj.onload = () => {
console.log(imageObj.naturalWidth, imageObj.naturalHeight);
}
}
This allows you to get the image dimensions and aspect ratio all from a File without rendering it. It can easily convert the onload functions to RxJS Observables using fromEvent for a better async experience:
// fr is the file reader, and this is the same as fr.onload = () => { ... }
fromEvent(fr, 'load')

Simply, you can test like this.
<script>
(function($) {
$(document).ready(function() {
console.log("ready....");
var i = 0;
var img;
for(i=1; i<13; i++) {
img = new Image();
img.src = 'img/' + i + '.jpg';
console.log("name : " + img.src);
img.onload = function() {
if(this.height > this.width) {
console.log(this.src + " : portrait");
}
else if(this.width > this.height) {
console.log(this.src + " : landscape");
}
else {
console.log(this.src + " : square");
}
}
}
});
}(jQuery));
</script>

const file = event.target.files[0];
const img = new Image();
img.onload = function () {
width = img.width;
height = img.height;
};
img.src = URL.createObjectURL(file);
alert(width + "x" + height);

It is important to remove the browser interpreted setting from the parent div. So if you want the real image width and height, you can just use
$('.right-sidebar').find('img').each(function(){
$(this).removeAttr("width");
$(this).removeAttr("height");
$(this).imageResize();
});
This is one TYPO3 project example from me where I need the real properties of the image to scale it with the right relation.

Use
function outmeInside() {
var output = document.getElementById('preview_product_image');
if (this.height < 600 || this.width < 600) {
output.src = "http://localhost/danieladenew/uploads/no-photo.jpg";
alert("The image you have selected is low resolution image. Your image width=" + this.width + ", height=" + this.height + ". Please select image greater or equal to 600x600. Thanks!");
}
else {
output.src = URL.createObjectURL(event.target.files[0]);
}
return;
}
img.src = URL.createObjectURL(event.target.files[0]);
}
This works for multiple images preview and upload. If you have to select for each of the images one by one, then copy and paste into all the preview image function and validate!!!

Before acquiring an element's attributes, the document page should be onload:
window.onload = function(){
console.log(img.offsetWidth,img.offsetHeight);
}

Just pass the 'img' file object which is obtained by the input element. When we select the correct file, it will give the netural height and width of the image.
function getNeturalHeightWidth(file) {
let h, w;
let reader = new FileReader();
reader.onload = () => {
let tmpImgNode = document.createElement("img");
tmpImgNode.onload = function() {
h = this.naturalHeight;
w = this.naturalWidth;
};
tmpImgNode.src = reader.result;
};
reader.readAsDataURL(file);
}
return h, w;
}

You can also use:
var image=document.getElementById("imageID");
var width=image.offsetWidth;
var height=image.offsetHeight;

Get image size already on DOM with jquery / javascript [duplicate]

Is there a JavaScript or jQuery API or method to get the dimensions of an image on the page?

You can programmatically get the image and check the dimensions using JavaScript...
const img = new Image();
img.onload = function() {
alert(this.width + 'x' + this.height);
}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';
This can be useful if the image is not a part of the markup.

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;

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).

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());
});
});

Using clientWidth and clientHeight is, I think, 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 code:
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

Using jQuery, you do this:
var imgWidth = $("#imgIDWhatever").width();

The thing all other have forgot is that you can’t check image size before it loads. When the author checks all of posted methods it will work probably only on localhost.
Since jQuery could be used here, remember that the 'ready' event is fired before images are loaded. $('#xxx').width() and .height() should be fired in the onload event or later.

You can only really do this using a callback of the load event as the size of the image is not known until it has actually finished loading. Something like the code below...
var imgTesting = new Image();
function CreateDelegate(contextObject, delegateMethod)
{
return function()
{
return delegateMethod.apply(contextObject, arguments);
}
}
function imgTesting_onload()
{
alert(this.width + " by " + this.height);
}
imgTesting.onload = CreateDelegate(imgTesting, imgTesting_onload);
imgTesting.src = 'yourimage.jpg';

Let's combine everything we learned here into one simple function (imageDimensions()). It uses promises.
// helper to get dimensions of an image
const imageDimensions = file =>
new Promise((resolve, reject) => {
const img = new Image()
// the following handler will fire after a successful loading of the image
img.onload = () => {
const { naturalWidth: width, naturalHeight: height } = img
resolve({ width, height })
}
// and this handler will fire if there was an error with the image (like if it's not really an image or a corrupted one)
img.onerror = () => {
reject('There was some problem with the image.')
}
img.src = URL.createObjectURL(file)
})
// here's how to use the helper
const getInfo = async ({ target: { files } }) => {
const [file] = files
try {
const dimensions = await imageDimensions(file)
console.info(dimensions)
} catch(error) {
console.error(error)
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/7.0.0-beta.3/babel.min.js"></script>
Select an image:
<input
type="file"
onchange="getInfo(event)"
/>
<br />
<small>It works offline.</small>

To get the natural height and width:
document.querySelector("img").naturalHeight;
document.querySelector("img").naturalWidth;
<img src="img.png">
And if you want to get style height and width:
document.querySelector("img").offsetHeight;
document.querySelector("img").offsetWidth;

Assuming, we want to get image dimensions of <img id="an-img" src"...">
// Query after all the elements on the page have loaded.
// Or, use `onload` on a particular element to check if it is loaded.
document.addEventListener('DOMContentLoaded', function () {
var el = document.getElementById("an-img");
console.log({
"naturalWidth": el.naturalWidth, // Only on HTMLImageElement
"naturalHeight": el.naturalHeight, // Only on HTMLImageElement
"offsetWidth": el.offsetWidth,
"offsetHeight": el.offsetHeight
});
})
Natural Dimensions
el.naturalWidth and el.naturalHeight will get us the natural dimensions, the dimensions of the image file.
Layout Dimensions
el.offsetWidth and el.offsetHeight will get us the dimensions at which the element is rendered on the document.

This answer was exactly what I was looking for (in jQuery):
var imageNaturalWidth = $('image-selector').prop('naturalWidth');
var imageNaturalHeight = $('image-selector').prop('naturalHeight');

I think I improved the source code to be able to let the image load before trying to find out its properties. Otherwise, it will display '0 * 0', because the next statement would have been called before the file was loaded into the browser. It requires jQuery...
function getImgSize(imgSrc) {
var newImg = new Image();
newImg.src = imgSrc;
var height = newImg.height;
var width = newImg.width;
p = $(newImg).ready(function() {
return {width: newImg.width, height: newImg.height};
});
alert (p[0]['width'] + " " + p[0]['height']);
}

I thought this might be helpful to some who are using JavaScript and/or TypeScript in 2019.
I found the following, as some have suggested, to be incorrect:
let img = new Image();
img.onload = function() {
console.log(this.width, this.height) // Error: undefined is not an object
};
img.src = "http://example.com/myimage.jpg";
This is correct:
let img = new Image();
img.onload = function() {
console.log(img.width, img.height)
};
img.src = "http://example.com/myimage.jpg";
Conclusion:
Use img, not this, in the onload function.

With the jQuery library-
Use .width() and .height().
More in jQuery width and jQuery heigth.
Example Code-
$(document).ready(function(){
$("button").click(function()
{
alert("Width of image: " + $("#img_exmpl").width());
alert("Height of image: " + $("#img_exmpl").height());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<img id="img_exmpl" src="http://images.all-free-download.com/images/graphicthumb/beauty_of_nature_9_210287.jpg">
<button>Display dimensions of img</button>

Before using the real image size, you should load the source image. If you use the jQuery framework, you can get the real image size in a simple way.
$("ImageID").load(function(){
console.log($(this).width() + "x" + $(this).height())
})

A jQuery answer:
$height = $('#image_id').height();
$width = $('#image_id').width();

My two cents in jQuery
Disclaimer: This does not necessarily answer this question, but broadens our capabilities. It was tested and working in jQuery 3.3.1
Let’s consider:
You have the image URL/path and you want to get the image width and height without rendering it on the DOM,
Before rendering image on the DOM, you need to set the offsetParent node or image div wrapper element to the image width and height, to create a fluid wrapper for different image sizes, i.e., when clicking a button to view image on a modal/lightbox
This is how I will do it:
// image path
const imageUrl = '/path/to/your/image.jpg'
// Create dummy image to get real width and height
$('<img alt="" src="">').attr("src", imageUrl).on('load', function(){
const realWidth = this.width;
const realHeight = this.height;
alert(`Original width: ${realWidth}, Original height: ${realHeight}`);
})

Recently I had the same issue for an error in the flex slider. The first image's height was set smaller due to the loading delay. I tried the following method for resolving that issue and it's worked.
// Create an image with a reference id. Id shall
// be used for removing it from the DOM later.
var tempImg = $('<img id="testImage" />');
// If you want to get the height with respect to any specific width you set.
// I used window width here.
tempImg.css('width', window.innerWidth);
tempImg[0].onload = function () {
$(this).css('height', 'auto').css('display', 'none');
var imgHeight = $(this).height();
// Remove it if you don't want this image anymore.
$('#testImage').remove();
}
// Append to body
$('body').append(tempImg);
// Set an image URL. I am using an image which I got from Google.
tempImg[0].src ='http://aspo.org/wp-content/uploads/strips.jpg';
This will give you the height with respect to the width you set rather than original width or Zero.

Nicky De Maeyer asked for a background picture; I simply get it from the CSS content and replace the "url()":
var div = $('#my-bg-div');
var url = div.css('background-image').replace(/^url\(\'?(.*)\'?\)$/, '$1');
var img = new Image();
img.src = url;
console.log('img:', img.width + 'x' + img.height); // Zero, image not yet loaded
console.log('div:', div.width() + 'x' + div.height());
img.onload = function() {
console.log('img:', img.width + 'x' + img.height, (img.width/div.width()));
}

You can apply the onload handler property when the page loads in JavaScript or jQuery like this:
$(document).ready(function(){
var width = img.clientWidth;
var height = img.clientHeight;
});

This is an alternative answer for Node.js. That isn't likely what the OP meant, but it could come in handy and seems to be in the scope of the question.
This is a solution with Node.js, and the example uses the Next.js framework, but it would work with any Node.js framework. It uses the probe-image-size NPM package to resolve the image attributes from the server side.
Example use case: I used the below code to resolve the size of an image from an Airtable Automation script, which calls my own analyzeImage API and returns the image's props.
import {
NextApiRequest,
NextApiResponse,
} from 'next';
import probe from 'probe-image-size';
export const analyzeImage = async (req: NextApiRequest, res: NextApiResponse): Promise<void> => {
try {
const result = await probe('http://www.google.com/intl/en_ALL/images/logo.gif');
res.json(result);
} catch (e) {
res.json({
error: true,
message: process.env.NODE_ENV === 'production' ? undefined : e.message,
});
}
};
export default analyzeImage;
Yields:
{
"width": 276,
"height": 110,
"type": "gif",
"mime": "image/gif",
"wUnits": "px",
"hUnits": "px",
"length": 8558,
"url": "http://www.google.com/intl/en_ALL/images/logo.gif"
}

In my case, I have a File type (that is guaranteed to be an image), and I want the image dimensions without loading it on the DOM.
General strategy: Convert File to ArrayBuffer → Convert ArrayBuffer to a base64 string → use this as the image source with an Image class → use naturalHeight & naturalWidth to get dimensions.
const fr = new FileReader();
fr.readAsArrayBuffer(image); // Image the 'File' object
fr.onload = () => {
const arrayBuffer: ArrayBuffer = fr.result as ArrayBuffer;
// Convert to base64. String.fromCharCode can hit a stack overflow error if you pass
// the entire arrayBuffer in, and iteration gets around this
let binary = '';
const bytes = new Uint8Array(arrayBuffer);
bytes.forEach(b => binary += String.fromCharCode(b));
const base64Data = window.btoa(binary);
// Create an image object. Note, a default width/height MUST be given to the constructor (per
// the documentation) or naturalWidth/Height will always return 0.
const imageObj = new Image(100, 100);
imageObj.src = `data:${image.type};base64,${base64Data}`;
imageObj.onload = () => {
console.log(imageObj.naturalWidth, imageObj.naturalHeight);
}
}
This allows you to get the image dimensions and aspect ratio all from a File without rendering it. It can easily convert the onload functions to RxJS Observables using fromEvent for a better async experience:
// fr is the file reader, and this is the same as fr.onload = () => { ... }
fromEvent(fr, 'load')

Simply, you can test like this.
<script>
(function($) {
$(document).ready(function() {
console.log("ready....");
var i = 0;
var img;
for(i=1; i<13; i++) {
img = new Image();
img.src = 'img/' + i + '.jpg';
console.log("name : " + img.src);
img.onload = function() {
if(this.height > this.width) {
console.log(this.src + " : portrait");
}
else if(this.width > this.height) {
console.log(this.src + " : landscape");
}
else {
console.log(this.src + " : square");
}
}
}
});
}(jQuery));
</script>

const file = event.target.files[0];
const img = new Image();
img.onload = function () {
width = img.width;
height = img.height;
};
img.src = URL.createObjectURL(file);
alert(width + "x" + height);

It is important to remove the browser interpreted setting from the parent div. So if you want the real image width and height, you can just use
$('.right-sidebar').find('img').each(function(){
$(this).removeAttr("width");
$(this).removeAttr("height");
$(this).imageResize();
});
This is one TYPO3 project example from me where I need the real properties of the image to scale it with the right relation.

Use
function outmeInside() {
var output = document.getElementById('preview_product_image');
if (this.height < 600 || this.width < 600) {
output.src = "http://localhost/danieladenew/uploads/no-photo.jpg";
alert("The image you have selected is low resolution image. Your image width=" + this.width + ", height=" + this.height + ". Please select image greater or equal to 600x600. Thanks!");
}
else {
output.src = URL.createObjectURL(event.target.files[0]);
}
return;
}
img.src = URL.createObjectURL(event.target.files[0]);
}
This works for multiple images preview and upload. If you have to select for each of the images one by one, then copy and paste into all the preview image function and validate!!!

Before acquiring an element's attributes, the document page should be onload:
window.onload = function(){
console.log(img.offsetWidth,img.offsetHeight);
}

Just pass the 'img' file object which is obtained by the input element. When we select the correct file, it will give the netural height and width of the image.
function getNeturalHeightWidth(file) {
let h, w;
let reader = new FileReader();
reader.onload = () => {
let tmpImgNode = document.createElement("img");
tmpImgNode.onload = function() {
h = this.naturalHeight;
w = this.naturalWidth;
};
tmpImgNode.src = reader.result;
};
reader.readAsDataURL(file);
}
return h, w;
}

You can also use:
var image=document.getElementById("imageID");
var width=image.offsetWidth;
var height=image.offsetHeight;

How to get the downloaded image's width&height?

I want to set the width and height of the container <div> of <img> after the image is downloaded, how to do it?

function fn (div, url_path) {
var img = new Image();
img.onload = function () {
div.style.width = img.width;
div.style.height = img.height;
};
img.src = "url_path";
}
fn(document.getElementsByTagName('div')[0], 'http://some-url-to-image.com/1.jpg');

Put it on the page hidden, then measure its width. See here for a good explanation of how to measure the width of a hidden object (just calling width() returns 0).

It is best to wait for the image to be loaded unless you want false results.
jQuery('#image').load(function() {
var jThis = jQuery(this);
var width = jThis.width();
var height = jThis.height();
yourFunction(width, height); //whatever you want to do with these values
jThis.unbind('load'); //might be necessary if you only want this to happen once. Remove this if #image is a container for multiple uses.
})
EDIT 1
Instead of yourFunction(), you could use this since it fits your description better:
jThis.parents('#container').css({
width: width,
height: height
});

Javascript: Adjusting image container height to dynamic image height after image load?

i load graphs via the following javascript function:
function loadMCorCBGraph(self,surveyID,questionID,varID) {
var img = new Image();
img.onload = function() {
$(self).parents().parents().siblings(".graph_container")
.empty().append(img);
};
img.src = 'drawGraph.php?type=surveys_report_MC_or_CB&surveyID=' + surveyID + '&questionID=' + questionID +
(varID != null ? '&varID=' + varID : '') + '&companyID=<?php echo $_SESSION['companyID'] ?>';
}
however, the graph height is unknown until it is drawn. i was wondering if there was a way to get this height after it has loaded and set the container height to cet height.
i thought about putting:
.css("height", THE_IMAGE_HEIGHT)
in the onload function, but i am having trouble finding this image's height. debugging shows that (inside the onload):
$(this).height() = 0
img.height = ReferenceError: img is not defined
this.height = 425
now the last one, this.height, is clearly referring to the container, which is set with a height of 425px.
any ideas as to how to get the height?
thanks!

img.onload = function() {
$Container = $(self).parents().parents().siblings(".graph_container");
$Container.empty().append(img);
this.find('img').each(function(){
//Dynamically check each image
if(this.height > 400)
{
$(this).height(400);
}
console.log(this); //Should see object with attribs.
})
};
Give that a go and tell me what happens, also check your console log to see if the Object is the image element.

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

Is there a JavaScript or jQuery API or method to get the dimensions of an image on the page?

You can programmatically get the image and check the dimensions using JavaScript...
const img = new Image();
img.onload = function() {
alert(this.width + 'x' + this.height);
}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';
This can be useful if the image is not a part of the markup.

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;

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).

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());
});
});

Using clientWidth and clientHeight is, I think, 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 code:
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

Using jQuery, you do this:
var imgWidth = $("#imgIDWhatever").width();

The thing all other have forgot is that you can’t check image size before it loads. When the author checks all of posted methods it will work probably only on localhost.
Since jQuery could be used here, remember that the 'ready' event is fired before images are loaded. $('#xxx').width() and .height() should be fired in the onload event or later.

You can only really do this using a callback of the load event as the size of the image is not known until it has actually finished loading. Something like the code below...
var imgTesting = new Image();
function CreateDelegate(contextObject, delegateMethod)
{
return function()
{
return delegateMethod.apply(contextObject, arguments);
}
}
function imgTesting_onload()
{
alert(this.width + " by " + this.height);
}
imgTesting.onload = CreateDelegate(imgTesting, imgTesting_onload);
imgTesting.src = 'yourimage.jpg';

Let's combine everything we learned here into one simple function (imageDimensions()). It uses promises.
// helper to get dimensions of an image
const imageDimensions = file =>
new Promise((resolve, reject) => {
const img = new Image()
// the following handler will fire after a successful loading of the image
img.onload = () => {
const { naturalWidth: width, naturalHeight: height } = img
resolve({ width, height })
}
// and this handler will fire if there was an error with the image (like if it's not really an image or a corrupted one)
img.onerror = () => {
reject('There was some problem with the image.')
}
img.src = URL.createObjectURL(file)
})
// here's how to use the helper
const getInfo = async ({ target: { files } }) => {
const [file] = files
try {
const dimensions = await imageDimensions(file)
console.info(dimensions)
} catch(error) {
console.error(error)
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/7.0.0-beta.3/babel.min.js"></script>
Select an image:
<input
type="file"
onchange="getInfo(event)"
/>
<br />
<small>It works offline.</small>

To get the natural height and width:
document.querySelector("img").naturalHeight;
document.querySelector("img").naturalWidth;
<img src="img.png">
And if you want to get style height and width:
document.querySelector("img").offsetHeight;
document.querySelector("img").offsetWidth;

Assuming, we want to get image dimensions of <img id="an-img" src"...">
// Query after all the elements on the page have loaded.
// Or, use `onload` on a particular element to check if it is loaded.
document.addEventListener('DOMContentLoaded', function () {
var el = document.getElementById("an-img");
console.log({
"naturalWidth": el.naturalWidth, // Only on HTMLImageElement
"naturalHeight": el.naturalHeight, // Only on HTMLImageElement
"offsetWidth": el.offsetWidth,
"offsetHeight": el.offsetHeight
});
})
Natural Dimensions
el.naturalWidth and el.naturalHeight will get us the natural dimensions, the dimensions of the image file.
Layout Dimensions
el.offsetWidth and el.offsetHeight will get us the dimensions at which the element is rendered on the document.

This answer was exactly what I was looking for (in jQuery):
var imageNaturalWidth = $('image-selector').prop('naturalWidth');
var imageNaturalHeight = $('image-selector').prop('naturalHeight');

I think I improved the source code to be able to let the image load before trying to find out its properties. Otherwise, it will display '0 * 0', because the next statement would have been called before the file was loaded into the browser. It requires jQuery...
function getImgSize(imgSrc) {
var newImg = new Image();
newImg.src = imgSrc;
var height = newImg.height;
var width = newImg.width;
p = $(newImg).ready(function() {
return {width: newImg.width, height: newImg.height};
});
alert (p[0]['width'] + " " + p[0]['height']);
}

I thought this might be helpful to some who are using JavaScript and/or TypeScript in 2019.
I found the following, as some have suggested, to be incorrect:
let img = new Image();
img.onload = function() {
console.log(this.width, this.height) // Error: undefined is not an object
};
img.src = "http://example.com/myimage.jpg";
This is correct:
let img = new Image();
img.onload = function() {
console.log(img.width, img.height)
};
img.src = "http://example.com/myimage.jpg";
Conclusion:
Use img, not this, in the onload function.

With the jQuery library-
Use .width() and .height().
More in jQuery width and jQuery heigth.
Example Code-
$(document).ready(function(){
$("button").click(function()
{
alert("Width of image: " + $("#img_exmpl").width());
alert("Height of image: " + $("#img_exmpl").height());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<img id="img_exmpl" src="http://images.all-free-download.com/images/graphicthumb/beauty_of_nature_9_210287.jpg">
<button>Display dimensions of img</button>

Before using the real image size, you should load the source image. If you use the jQuery framework, you can get the real image size in a simple way.
$("ImageID").load(function(){
console.log($(this).width() + "x" + $(this).height())
})

A jQuery answer:
$height = $('#image_id').height();
$width = $('#image_id').width();

My two cents in jQuery
Disclaimer: This does not necessarily answer this question, but broadens our capabilities. It was tested and working in jQuery 3.3.1
Let’s consider:
You have the image URL/path and you want to get the image width and height without rendering it on the DOM,
Before rendering image on the DOM, you need to set the offsetParent node or image div wrapper element to the image width and height, to create a fluid wrapper for different image sizes, i.e., when clicking a button to view image on a modal/lightbox
This is how I will do it:
// image path
const imageUrl = '/path/to/your/image.jpg'
// Create dummy image to get real width and height
$('<img alt="" src="">').attr("src", imageUrl).on('load', function(){
const realWidth = this.width;
const realHeight = this.height;
alert(`Original width: ${realWidth}, Original height: ${realHeight}`);
})

Recently I had the same issue for an error in the flex slider. The first image's height was set smaller due to the loading delay. I tried the following method for resolving that issue and it's worked.
// Create an image with a reference id. Id shall
// be used for removing it from the DOM later.
var tempImg = $('<img id="testImage" />');
// If you want to get the height with respect to any specific width you set.
// I used window width here.
tempImg.css('width', window.innerWidth);
tempImg[0].onload = function () {
$(this).css('height', 'auto').css('display', 'none');
var imgHeight = $(this).height();
// Remove it if you don't want this image anymore.
$('#testImage').remove();
}
// Append to body
$('body').append(tempImg);
// Set an image URL. I am using an image which I got from Google.
tempImg[0].src ='http://aspo.org/wp-content/uploads/strips.jpg';
This will give you the height with respect to the width you set rather than original width or Zero.

Nicky De Maeyer asked for a background picture; I simply get it from the CSS content and replace the "url()":
var div = $('#my-bg-div');
var url = div.css('background-image').replace(/^url\(\'?(.*)\'?\)$/, '$1');
var img = new Image();
img.src = url;
console.log('img:', img.width + 'x' + img.height); // Zero, image not yet loaded
console.log('div:', div.width() + 'x' + div.height());
img.onload = function() {
console.log('img:', img.width + 'x' + img.height, (img.width/div.width()));
}

You can apply the onload handler property when the page loads in JavaScript or jQuery like this:
$(document).ready(function(){
var width = img.clientWidth;
var height = img.clientHeight;
});

This is an alternative answer for Node.js. That isn't likely what the OP meant, but it could come in handy and seems to be in the scope of the question.
This is a solution with Node.js, and the example uses the Next.js framework, but it would work with any Node.js framework. It uses the probe-image-size NPM package to resolve the image attributes from the server side.
Example use case: I used the below code to resolve the size of an image from an Airtable Automation script, which calls my own analyzeImage API and returns the image's props.
import {
NextApiRequest,
NextApiResponse,
} from 'next';
import probe from 'probe-image-size';
export const analyzeImage = async (req: NextApiRequest, res: NextApiResponse): Promise<void> => {
try {
const result = await probe('http://www.google.com/intl/en_ALL/images/logo.gif');
res.json(result);
} catch (e) {
res.json({
error: true,
message: process.env.NODE_ENV === 'production' ? undefined : e.message,
});
}
};
export default analyzeImage;
Yields:
{
"width": 276,
"height": 110,
"type": "gif",
"mime": "image/gif",
"wUnits": "px",
"hUnits": "px",
"length": 8558,
"url": "http://www.google.com/intl/en_ALL/images/logo.gif"
}

In my case, I have a File type (that is guaranteed to be an image), and I want the image dimensions without loading it on the DOM.
General strategy: Convert File to ArrayBuffer → Convert ArrayBuffer to a base64 string → use this as the image source with an Image class → use naturalHeight & naturalWidth to get dimensions.
const fr = new FileReader();
fr.readAsArrayBuffer(image); // Image the 'File' object
fr.onload = () => {
const arrayBuffer: ArrayBuffer = fr.result as ArrayBuffer;
// Convert to base64. String.fromCharCode can hit a stack overflow error if you pass
// the entire arrayBuffer in, and iteration gets around this
let binary = '';
const bytes = new Uint8Array(arrayBuffer);
bytes.forEach(b => binary += String.fromCharCode(b));
const base64Data = window.btoa(binary);
// Create an image object. Note, a default width/height MUST be given to the constructor (per
// the documentation) or naturalWidth/Height will always return 0.
const imageObj = new Image(100, 100);
imageObj.src = `data:${image.type};base64,${base64Data}`;
imageObj.onload = () => {
console.log(imageObj.naturalWidth, imageObj.naturalHeight);
}
}
This allows you to get the image dimensions and aspect ratio all from a File without rendering it. It can easily convert the onload functions to RxJS Observables using fromEvent for a better async experience:
// fr is the file reader, and this is the same as fr.onload = () => { ... }
fromEvent(fr, 'load')

Simply, you can test like this.
<script>
(function($) {
$(document).ready(function() {
console.log("ready....");
var i = 0;
var img;
for(i=1; i<13; i++) {
img = new Image();
img.src = 'img/' + i + '.jpg';
console.log("name : " + img.src);
img.onload = function() {
if(this.height > this.width) {
console.log(this.src + " : portrait");
}
else if(this.width > this.height) {
console.log(this.src + " : landscape");
}
else {
console.log(this.src + " : square");
}
}
}
});
}(jQuery));
</script>

const file = event.target.files[0];
const img = new Image();
img.onload = function () {
width = img.width;
height = img.height;
};
img.src = URL.createObjectURL(file);
alert(width + "x" + height);

It is important to remove the browser interpreted setting from the parent div. So if you want the real image width and height, you can just use
$('.right-sidebar').find('img').each(function(){
$(this).removeAttr("width");
$(this).removeAttr("height");
$(this).imageResize();
});
This is one TYPO3 project example from me where I need the real properties of the image to scale it with the right relation.

Use
function outmeInside() {
var output = document.getElementById('preview_product_image');
if (this.height < 600 || this.width < 600) {
output.src = "http://localhost/danieladenew/uploads/no-photo.jpg";
alert("The image you have selected is low resolution image. Your image width=" + this.width + ", height=" + this.height + ". Please select image greater or equal to 600x600. Thanks!");
}
else {
output.src = URL.createObjectURL(event.target.files[0]);
}
return;
}
img.src = URL.createObjectURL(event.target.files[0]);
}
This works for multiple images preview and upload. If you have to select for each of the images one by one, then copy and paste into all the preview image function and validate!!!

Before acquiring an element's attributes, the document page should be onload:
window.onload = function(){
console.log(img.offsetWidth,img.offsetHeight);
}

Just pass the 'img' file object which is obtained by the input element. When we select the correct file, it will give the netural height and width of the image.
function getNeturalHeightWidth(file) {
let h, w;
let reader = new FileReader();
reader.onload = () => {
let tmpImgNode = document.createElement("img");
tmpImgNode.onload = function() {
h = this.naturalHeight;
w = this.naturalWidth;
};
tmpImgNode.src = reader.result;
};
reader.readAsDataURL(file);
}
return h, w;
}

You can also use:
var image=document.getElementById("imageID");
var width=image.offsetWidth;
var height=image.offsetHeight;