Limit Number Of Result in AutoComplete Jquery Ui [duplicate]

This question already has an answer here:

• Limit results in jQuery UI Autocomplete 9 answers

I've read all the questions in stackoverflow but i couldn't solve it.
I want To limit the show 1 result .

here's my Code :

Json

[
  {
    "label": "soheil", "category": "کانال" , "class":"channel", "url":"http://yahoo.com"
  },
  {
    "label": "بانجی‌جامپینگ", "category": "کانال" , "class":"channel", "url":"http://google.com"
  }
]  

js :

$.widget( "custom.catcomplete", $.ui.autocomplete, {
    _create: function() {
        this._super();
        this.widget().menu( "option", "items", "> :not(.ui-autocomplete-category)" );
    },
    _renderMenu: function( ul, items ) {
        var that = this,
            currentCategory = "";
        $.each( items, function( index, item ) {
            var li;
            if ( item.category != currentCategory ) {
                ul.append( "<li class='ui-autocomplete-category'>" + item.category + "</li>" );
                currentCategory = item.category;
            }
            li = that._renderItemData( ul, item );
            if ( item.category ) {
                li.prepend("<span></span>")
                li.attr( "aria-label", item.category + " : " + item.label);
                li.attr("class", item.class);
            }
        });
    }
});

var data = "/data.json";

    $( "#search-input" ).catcomplete({
    source:data,

    select:function (event, ui) {
            window.location.href = ui.item.url;
        }
    });

I want to show 1 result in maxmimum .

Any Advice ? Thanks