Get the real width and height of an image with JavaScript? (in Safari/Chrome)

Question

I am creating a jQuery plugin.

How do I get the real image width and height with Javascript in Safari?

The following works with Firefox 3, IE7 and Opera 9:

Answer 1

The root problem is that WebKit browsers (Safari and Chrome) load JavaScript and CSS information in parallel. Thus, JavaScript may execute before the styling effects of CSS have been computed, returning the wrong answer. In jQuery, I've found that the solution is to wait until document.readyState == 'complete', .e.g.,

jQuery(document).ready(function(){
  if (jQuery.browser.safari && document.readyState != "complete"){
    //console.info('ready...');
    setTimeout( arguments.callee, 100 );
    return;
  } 
  ... (rest of function) 

As far as width and height goes... depending on what you are doing you may want offsetWidth and offsetHeight, which include things like borders and padding.