I found the solution. Whilst jRails uses jquery-ui-1.5, it is still using jquery-1.2.6, and "closest" is a 1.3 feature.
The following works just fine: <a href="#" onclick="$(this).parents('.setting').remove()">remove</ a> Ricardo Tomasi wrote: > 'this' in an attribute event handler refers to 'window', not the > element itself. In my copy of JavaScript, The Definitive Guide (5th ed), it says (p396) "Whether you define an event handler with an HTML attribute or with a JavaScript property, you are assigning a function to a property of a document element. In other words, you're defining a new method of the document element. When your event handler is invoked, it is invoked as a method of the element on which the event occurred, so the 'this' keyword refers to that target element. This behavior is useful and unsurprising" Regards, Brian.