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You're probably looking for Scott González' autoSelect extension. Just including this extension on the page will allow the select event to fire if the user enters a valid value and should require no changes on your end:

/*
 * jQuery UI Autocomplete Auto Select Extension
 *
 * Copyright 2010, Scott González (http://scottgonzalez.com)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * http://github.com/scottgonzalez/jquery-ui-extensions
 */
(function( $ ) {

$.ui.autocomplete.prototype.options.autoSelect = true;
$( ".ui-autocomplete-input" ).live( "blur", function( event ) {
    var autocomplete = $( this ).data( "autocomplete" );
    if ( !autocomplete.options.autoSelect || autocomplete.selectedItem ) { return; }

    var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( $(this).val() ) + "$", "i" );
    autocomplete.widget().children( ".ui-menu-item" ).each(function() {
        var item = $( this ).data( "item.autocomplete" );
        if ( matcher.test( item.label || item.value || item ) ) {
            autocomplete.selectedItem = item;
            return false;
        }
    });
    if ( autocomplete.selectedItem ) {
        autocomplete._trigger( "select", event, { item: autocomplete.selectedItem } );
    }
});

}( jQuery ));

以下是使用扩展名的示例: http://jsfiddle.net/vFWUt /226/