How do you bind jQuery UI autocomplete using .on()?

If I understood correctly, your problem looks very similar to one I saw in another topic. I’ll adapt my answer to your case, let’s see if it solves your problem:

$(document).on("focus",[selector],function(e) {
    if ( !$(this).data("autocomplete") ) { // If the autocomplete wasn't called yet:
        $(this).autocomplete({             //   call it
            source:['abc','ade','afg']     //     passing some parameters
        });
    }
});

Working example at jsFiddle. I used focus instead of keydown because I need to re-trigger the event, and I don’t know how to do it with key/mouse events.

Update: You could also consider using clone, if your additional inputs will have the same autocomplete as an existing one:

var count = 0;
$(cloneButton).click(function() {
    var newid = "cloned_" + (count++); // Generates a unique id
    var clone = $(source) // the input with autocomplete your want to clone
        .clone()
        .attr("id",newid) // Must give a new id with clone
        .val("") // Clear the value (optional)
        .appendTo(target);
});

See the updated fiddle. There are also jQuery template plugins that might make this solution easier (although I haven’t used one myself yet, so I can’t talk from experience).

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