如何使用javascript选择Jquery UI Combobox的值

Question

如何使用javascript选择JQuery UI ComboBox的值。这是HTML。

<select id="combobox" class="custom-combobox" name="n">
                        <option>Select Action</option>
                        <option value="1">1</option>
                        <option value="2">2</option>
                        <option value="3">3</option>
                        <option value="4">4</option>
                    </select>

以下是JQuery UI Combobox。

(function( $ ) {
    $.widget( "custom.combobox", {
        _create: function() {
            this.wrapper = $( "<span>" )
                .addClass( "custom-combobox" )
                .insertAfter( this.element );

            this.element.hide();
            this._createAutocomplete();
            this._createShowAllButton();
        },
        _createAutocomplete: function() {
            var selected = this.element.children( ":selected" ),
                value = selected.val() ? selected.text() : "";

            this.input = $( "<input>" )
                .appendTo( this.wrapper )
                .val( value )
                .attr( "title", "" )
                .addClass( "custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left" )
                .autocomplete({
                    delay: 0,
                    minLength: 0,
                    source: $.proxy( this, "_source" ),
                    select: function( event, ui){
                        messagetext_log( ui.item ?
                            ui.item.value:
                            "Nothing selected, input was " + this.value );
                    }

                })
                .tooltip({
                    tooltipClass: "ui-state-highlight"
                });

            this._on( this.input, {
                autocompleteselect: function( event, ui ) {
                    ui.item.option.selected = true;
                    this._trigger( "select", event, {
                        item: ui.item.option
                    });
                },

                autocompletechange: "_removeIfInvalid"
            });
        },
        _createShowAllButton: function() {
            var input = this.input,
                wasOpen = false;

            $( "<a>" )
                .attr( "tabIndex", -1 )
                .attr( "title", "Show All Items" )
                .tooltip()
                .appendTo( this.wrapper )
                .button({
                    icons: {
                        primary: "ui-icon-triangle-1-s"
                    },
                    text: false
                })
                .removeClass( "ui-corner-all" )
                .addClass( "custom-combobox-toggle ui-corner-right" )
                .mousedown(function() {
                    wasOpen = input.autocomplete( "widget" ).is( ":visible" );
                })
                .click(function() {
                    input.focus();

                    // Close if already visible
                    if ( wasOpen ) {
                        return;
                    }

                    // Pass empty string as value to search for, displaying all results
                    input.autocomplete( "search", "" );
                });
        },
        _source: function( request, response ) {
            var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
            response( this.element.children( "option" ).map(function() {
                var text = $( this ).text();
                if ( this.value && ( !request.term || matcher.test(text) ) )
                    return {
                        label: text,
                        value: text,
                        option: this
                    };
            }) );
        },
        _removeIfInvalid: function( event, ui ) {

            // Selected an item, nothing to do
            if ( ui.item ) {
                return;
            }

            // Search for a match (case-insensitive)
            var value = this.input.val(),
                valueLowerCase = value.toLowerCase(),
                valid = false;
            this.element.children( "option" ).each(function() {
                if ( $( this ).text().toLowerCase() === valueLowerCase ) {
                    this.selected = valid = true;
                    return false;
                }
            });

            // Found a match, nothing to do
            if ( valid ) {
                return;
            }

            // Remove invalid value
            this.input
                .val( "" )
                .attr( "title", value + " didn't match any item" )
                .tooltip( "open" );
            this.element.val( "" );
            this._delay(function() {
                this.input.tooltip( "close" ).attr( "title", "" );
            }, 2500 );
            this.input.data( "ui-autocomplete" ).term = "";
        },
        _destroy: function() {
            this.wrapper.remove();
            this.element.css('visibility','visible');
        }
    });
    $( "#messagetext" ).val(function(){return this.value + message + ', '}).prependTo( "#messagetext" );
})( jQuery );

这是我尝试使用javascript做的事情。但是可以选择要选择的选项值。

reInsertComboBoxMessage=document.getElementById("combobox");

reInsertComboBoxMessage.options[1].selected=true;

和

reInsertComboBoxMessage=document.getElementById("combobox");

   reInsertComboBoxMessage.value="1";

OR

 $("#combobox").val('1');

在小提琴上工作正常 http://jsfiddle.net/pratik24/bwNUG/ 那么UI导入应该有问题吗？

我认为这是导致问题的原因。但不知道现在该做什么。我可以删除它。因为我需要在组合框上使用Jquery UI样式。如果我删除这个功能，那么每件事情都可以。

$(function (){

 $( "#combobox" ).combobox();
*$( "#toggle" ).click(function() {
        $( "#combobox" ).toggle();
    });
});

小提琴--- http://jsfiddle.net/pratik24/bwNUG/2/