Simple JQuery script working on JSFiddle, not on my site

Question

I\'m trying to get the original width of an image with JQuery and make some adjustments in the CSS with a condition if an image is wider than 700px.

I used this code

Answer 1

Try it like this:

var img = new Image();
img.onload = function () {
    var W2 = this.width;
    if(W2 > 700) {
        var photoHolder = document.getElementById("photoHolder");
        photoHolder.style.verticalAlign = 'none';
        photoHolder.style.textAlign = 'none';
    }
}
img.src = document.getElementById('imageViewerImg').src;

Also, open the console and check for errors, check that you only have one element with that ID etc.