select2 plugin and jquery ui modal dialogs

Question

I am using the Select2 plugin, but the built in search functionality doesn't work when the plugin is used with a jQuery modal dialog. I have a fiddle that shows the problem at...

http://jsfiddle.net/jeljeljel/s3AFx/

Notice the Search box will not accept the focus. There is supposed to be a workaround with the _allowInteraction event (http://api.jqueryui.com/dialog/#method-_allowInteraction), but it isn't working for me.

Can anyone help to see how to make this Fiddle work?

Also, this SO post (select2 plugin works fine when not inside a jquery modal dialog) discusses the same issue, but the suggested fixes are not working for me.

HTML

<div class="dialog">
    <select>
        <option>A tall ship was seen a</option>
        <option>A tall ship was seen b</option>
        <option>A tall ship was seen c</option>
        <option>A tall ship was seen d</option>
        <option>A tall ship was seen e</option>
        <option>A tall ship was seen f</option>
    </select>
</div>

JAVASCRIPT

$('.dialog').dialog({
    modal: true,
    _allowInteraction: function (event) {
        return !!$(event.target).is(".select2-input") || this._super(event);
    }
});
$('select').select2();

Answer 1

There's a new version of the fix bigwavesoftware gives for select2 4.0 from the github issue thread about this problem:

if ($.ui && $.ui.dialog && $.ui.dialog.prototype._allowInteraction) {
    var ui_dialog_interaction = $.ui.dialog.prototype._allowInteraction;
    $.ui.dialog.prototype._allowInteraction = function(e) {
        if ($(e.target).closest('.select2-dropdown').length) return true;
        return ui_dialog_interaction.apply(this, arguments);
    };
}

This only needs to be run before any modal dialogs that will have select2 in them are created; you don't need to do anything special inside of the dialog options like in bigwavesoftware's solution.

JSFiddle of this fix in action

Answer 2

I solved this problem by adding this code to JS

$.ui.dialog.prototype._allowInteraction = function(e) {
    return !!$(e.target).closest('.ui-dialog, .ui-datepicker, .select2-drop').length;
};

I found this here https://github.com/ivaynberg/select2/issues/1246#issuecomment-17428249