How to Get a Div's Background Image Dimensions Using jQuery?

Determine Background Image Dimensions with jQuery

Introduction

Retrieving the dimensions of a div's background image using jQuery may seem straightforward but poses challenges. This article tackles this task and presents an extended solution that simplifies the process.

Questions:

Query: How can I obtain the background image size (width and height) of a div using jQuery?

Response A:

To retrieve the background image dimensions, employ the following approach:

var image_url = $('#myDiv').css('background-image'),
    image;

// Remove url() or url("")
image_url = image_url.match(/^url\("?(.+?)"?\)$/);

if (image_url[1]) {
    image_url = image_url[1];
    image = new Image();

    // Load image if needed
    $(image).load(function () {
        alert(image.width + 'x' + image.height);
    });

    image.src = image_url;
}

Response B (2018 Update):

For a comprehensive solution:

var getBackgroundImageSize = function(el) {
    var imageUrl = $(el).css('background-image').match(/^url\(["']?(.+?)["']?\)$/);
    var dfd = new $.Deferred();

    if (imageUrl) {
        var image = new Image();
        image.onload = dfd.resolve;
        image.onerror = dfd.reject;
        image.src = imageUrl[1];
    } else {
        dfd.reject();
    }

    return dfd.then(function() {
        return { width: this.width, height: this.height };
    });
};

Usage:

getBackgroundImageSize(jQuery('#mydiv'))
    .then(function(size) {
        console.log('Image size is', size.width, size.height);
    })
    .fail(function() {
        console.log('Could not get size because could not load image');
    });

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