How to add class or attribute automatically to img tags in CKEditor?

Question

I\'m using CKEditor version 3.6

I want to automatically add class=\"newsleft\" to any image tag added through the WYSIWYG.

I\'ve seen a few post

Answer 1

Here's another approach:

CKEDITOR.on( 'instanceReady', function( evt ) {
  evt.editor.dataProcessor.htmlFilter.addRules( {
    elements: {
      img: function(el) {
        el.addClass('img-responsive');
      }
    }
  });
});