How do I get background image size in jQuery?

Question

The problem is simple. How do I get a div's background image size (width and height) in jQuery. Is it even possible? I thought this would work:

jQuery('#myDiv').css('background-image').height();

The error message I get is that this is not a function.

Answer 1

The following is my adaptation:

$.fn.getBgDim = function (callback) {
    var width  = 0,
        height = 0,
        path   = $(this).css("background-image").replace("url(", "").replace(")", "").replace("\"", "").replace("\"", ""),
        tmp    = $("<img />");
    tmp.hide();
    tmp.bind("load", function() {
        width = $(this).width(); 
        height = $(this).height();
        callback({"width": width, "height": height});
        $(this).remove();
    });
    $("body").append(tmp);
    tmp.attr('src', path);
};

Usage:

$("#image").getBgDim(function(dim) {
    console.log("Height: " + dim.height + " Width: " + dim.width);
});

Answer 2

Here is my rendition.

$.fn.getBgImage = function (callback) {
    var path = $(this).css('background-image').match(/^url\("?(.+?)"?\)$/)[1];
    var tempImg = $('<img />').hide().bind('load', function () {
        callback($(this).width(), $(this).height());
        $(this).remove();
    }).appendTo('body').attr('src', path);
};

Usage:

imgDiv.getBgImage(function (imgW, imgH) {
    //use the imgW and imgH here!   
});

Answer 3

Its been a while but I needed this solution as well, based on some suggested solutions here is my complete solution.

$.fn.getBgHeight = function () {
        var height = 0;
        var path = $(this).css('background-image').replace('url', '').replace('(', '').replace(')', '').replace('"', '').replace('"', '');
        var tempImg = '<img id="tempImg" src="' + path + '"/>';
        $('body').append(tempImg); // add to DOM before </body>
        $('#tempImg').hide(); //hide image
        height = $('#tempImg').height(); //get height
        $('#tempImg').remove(); //remove from DOM
        return height;
    };

Answer 4

Another short way :

function bgSize($el, cb){
    $('<img />')
        .load(function(){ cb(this.width, this.height); })
        .attr('src', $el.css('background-image').match(/^url\("?(.+?)"?\)$/)[1]);
}

usage

bgSize($('#element-with-background'), function(width, height){
    console.log('width : ' + width + ' height : ' + height);
});

https://jsfiddle.net/x4u2ndha/58/

Answer 5

Late answer, but you could also do this:

var img = new Image;
img.src = $('#myDiv').css('background-image').replace(/url\(|\)$/ig, "");
var bgImgWidth = img.width;
var bgImgHeight = img.height;

Then you don't have to manipulate the dom objects;

Answer 6

css('background-image') will return "url(.....)", you can't test the height of the image with that, since it's not a DOM object.