为什么在.on（）工作时调用.error（）？ （IE11）

Question

$(function() {  /*jquery .ready()*/
  var thumb_img = new Image();
  thumb_img.id = 'cid_' + 1730;
  thumb_img.src = ""; 

  $(thumb_img).on('load', function() {
    console.log("Image loaded " + thumb_img.src);
  }).error(function(){
    console.log("ERROR loading image " + thumb_img.src);
  });

  thumb_img.src = 'https://fiddle.jshell.net/img/logo.png';
});

Result in console:

Image loaded https://fiddle.jshell.net/img/logo.png
ERROR loading image https://fiddle.jshell.net/img/logo.png

I only want .error() to be called if the image cannot be loaded. This seems to be happening in IE (using 11) only.

Using jquery 2.0.2

Answer 1

The error is related to this line:

thumb_img.src = ""; 

Remove the previous line from your code. For IE11 it seems like changing the source attribute and so the error.

 var thumb_img = new Image(); thumb_img.id = 'cid_' + 1730; //thumb_img.src = ""; $(thumb_img).on('load', function() { console.log("Image loaded " + thumb_img.src); }).on('error', function(e){ alert("ERROR loading image " + thumb_img.src); }); thumb_img.src ='https://fiddle.jshell.net/img/logo.png'; document.body.appendChild(thumb_img); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script> 

Answer 2

Try using the load() method instead. That way you can look for errors in a callback. This should be fired anytime the src attribute of the image is changed. Which technically you are doing right away, hence the error.

$('img').load(function(response, status, xhr){
    console.log('loaded');
    console.log({response,status, xhr});
    if (status === "error") {
        console.log('error here');
    }
});

$('img').attr('src', 'someimageurl');