Question

Selected items in the listbox will show up in the UL below. Click on an item in the UL and it will remove it from the listbox and remove itself from the UL.

Reproduce Bug: http://jsfiddle.net/rkw79/mmBKf/2/

• Select an item in the listbox
• Click on that item in the UL, it will disappear and the listbox will show it as unselected
• Click on that same item in the listbox

Notice that the event is fired, but the item is not added

Now do the same steps, except use .prop(‘selected’,”) instead of .removeProp(‘selected’): http://jsfiddle.net/rkw79/mmBKf/3/

Answer 1

Everything you need to know is in the documentation.

With some built-in properties of a DOM element or window object, browsers may generate an error if an attempt is made to remove the property. jQuery first assigns the value undefined to the property and ignores any error the browser generates. In general, it is only necessary to remove custom properties that have been set on an object, and not built-in (native) properties.

Note: Do not use this method to remove native properties such as checked, disabled, or selected. This will remove the property completely and, once removed, cannot be added again to element. Use .prop() to set these properties to false instead.