JavaScript: Get image dimensions
JavascriptHtmlImageJavascript Problem Overview
I only have a URL to an image. I need to determine the height and width of this image using only JavaScript. The image cannot be visible to the user on the page. How can I get its dimensions?
Javascript Solutions
Solution 1 - Javascript
var img = new Image();
img.onload = function(){
var height = img.height;
var width = img.width;
// code here to use the dimensions
}
img.src = url;
Solution 2 - Javascript
Make a new Image
var img = new Image();
Set the src
img.src = your_src
Get the width and the height
//img.width
//img.height
Solution 3 - Javascript
naturalWidth and naturalHeight
var img = document.createElement("img");
img.onload = function (event)
{
console.log("natural:", img.naturalWidth, img.naturalHeight);
console.log("width,height:", img.width, img.height);
console.log("offsetW,offsetH:", img.offsetWidth, img.offsetHeight);
}
img.src = "image.jpg";
document.body.appendChild(img);
// css for tests
img { width:50%;height:50%; }
Solution 4 - Javascript
This uses the function and waits for it to complete.
http://jsfiddle.net/SN2t6/118/
function getMeta(url){
var r = $.Deferred();
$('<img/>').attr('src', url).load(function(){
var s = {w:this.width, h:this.height};
r.resolve(s)
});
return r;
}
getMeta("http://www.google.hr/images/srpr/logo3w.png").done(function(test){
alert(test.w + ' ' + test.h);
});
Solution 5 - Javascript
if you have image file from your input form. you can use like this
let images = new Image();
images.onload = () => {
console.log("Image Size", images.width, images.height)
}
images.onerror = () => result(true);
let fileReader = new FileReader();
fileReader.onload = () => images.src = fileReader.result;
fileReader.onerror = () => result(false);
if (fileTarget) {
fileReader.readAsDataURL(fileTarget);
}
Solution 6 - Javascript
Combining promises & typescript typing:
/**
* Returns image dimensions for specified URL.
*/
export const getImageDimensions = (url: string): Promise<{width: number, height: number}> => {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => resolve({
width: img.width,
height: img.height,
});
img.onerror = (error) => reject(error);
img.src = url;
});
};
Usage:
try {
const {width, height} = await getImageDimensions(entry.NWS_IMAGE);
console.log(`Image dimensions: ${width}px x ${height}px`);
} catch (e) {
// Could not load image from specified URL
console.error(e);
}
Solution 7 - Javascript
Get image size with jQuery
function getMeta(url){
$("<img/>",{
load : function(){
alert(this.width+' '+this.height);
},
src : url
});
}
Get image size with JavaScript
function getMeta(url){
var img = new Image();
img.onload = function(){
alert( this.width+' '+ this.height );
};
img.src = url;
}
Get image size with JavaScript (modern browsers, IE9+ )
function getMeta(url){
var img = new Image();
img.addEventListener("load", function(){
alert( this.naturalWidth +' '+ this.naturalHeight );
});
img.src = url;
}
Use the above simply as: getMeta( "http://example.com/img.jpg" );
https://developer.mozilla.org/en/docs/Web/API/HTMLImageElement
Solution 8 - Javascript
Similar question asked and answered using JQuery here:
function getMeta(url){
$("<img/>").attr("src", url).load(function(){
s = {w:this.width, h:this.height};
alert(s.w+' '+s.h);
});
}
getMeta("http://page.com/img.jpg");
Solution 9 - Javascript
Following code add image attribute height and width to each image on the page.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Untitled</title>
<script type="text/javascript">
function addImgAttributes()
{
for( i=0; i < document.images.length; i++)
{
width = document.images[i].width;
height = document.images[i].height;
window.document.images[i].setAttribute("width",width);
window.document.images[i].setAttribute("height",height);
}
}
</script>
</head>
<body onload="addImgAttributes();">
<img src="2_01.jpg"/>
<img src="2_01.jpg"/>
</body>
</html>