Form with array

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var countriesArray = $.map(countries, function (value, key) { return { value: value, data: key }; });

// Setup jQuery ajax mock:
$.mockjax({
    url: '*',
    responseTime: 2000,
    response: function (settings) {
        var query = settings.data.query,
            queryLowerCase = query.toLowerCase(),
            re = new RegExp('\\\\b' + $.Autocomplete.utils.escapeRegExChars(queryLowerCase), 'gi'),
            suggestions = $.grep(countriesArray, function (country) {
                 // return country.value.toLowerCase().indexOf(queryLowerCase) === 0;
                return re.test(country.value);
            }),
            response = {
                query: query,
                suggestions: suggestions
            };

        this.responseText = JSON.stringify(response);
    }
});

$('#country').autocomplete({
    lookup: countriesArray,
    minChars: 1,
    onSelect: function (suggestion) {
        $('#selection-country').html('You selected:' + suggestion.value);
    },
    showNoSuggestionNotice: true,
    noSuggestionNotice: 'Sorry,no matching results',
    groupBy: 'category'
});

Form with two array

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var nhlTeams = ['Atlanta','Boston','Buffalo','Calgary','Carolina','Chicago','Colorado','Columbus','Dallas','Detroit','Edmonton','Florida','Los Angeles','Minnesota','Montreal','Nashville',];var nbaTeams = ['New Jersey','New Rork','New York','Ottawa','Philadelphia','Phoenix','Pittsburgh','Saint Louis','San Jose','Tampa Bay','Toronto Maple','Vancouver','Washington'];var nhl = $.map(nhlTeams,function(team){return{value:team,data:{category:'Section A'}}});var nba = $.map(nbaTeams,function(team){return{value:team,data:{category:'Section B'}}});var teams = nhl.concat(nba);// Initialize autocomplete with local lookup:$('#city').autocomplete({lookup:teams,minChars:1,onSelect:function(suggestion){$('#selection').html('You selected: '+suggestion.value)},showNoSuggestionNotice:true,noSuggestionNotice:'Sorry, no matching results',groupBy:'category'});

Simple Autocomplete 

// Initialize autocomplete with custom appendTo:$('#autocomplete-dynamic').autocomplete({lookup:countriesArray});

Custom Suggestion Container 


// Initialize autocomplete with custom appendTo:$('#autocomplete-custom-append').autocomplete({lookup:countriesArray,});