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,
});

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