使用typeahead.js可以實現預先輸入，即智能提示，本篇在ASP.NET MVC下實現。實現效果如下：

首先是有關城市的模型。

    public class City    {public int Id { get; set; }public string Name { get; set; }public string PinYin { get; set; }    }

在HomeController中響應前端請求返回有關City的json數據。

public ActionResult GetCitiesJson(){    var result = new List<City>()    {new City(){Id = 1, Name = "青島",PinYin = "qingdao"},new City(){Id = 10, Name = "青山",PinYin = "qingshan"},new City(){Id = 11, Name = "青峰",PinYin = "qingfeng"},new City(){Id = 2, Name = "武漢",PinYin = "wuhan"},new City(){Id = 3, Name = "煙臺",PinYin = "yantai"},new City(){Id = 4, Name = "哈爾濱",PinYin = "haerbing"},new City(){Id = 5, Name = "北京",PinYin = "beijing"},new City(){Id = 6, Name = "安陽",PinYin = "angyang"},new City(){Id = 7, Name = "長春",PinYin = "changchun"},new City(){Id = 8, Name = "東陽",PinYin = "dongyang"},new City(){Id = 9, Name = "葛洲壩",PinYin = "gezhoubei"}    };    return Json(result,JsonRequestBehavior.AllowGet);}

在視圖中先加載City集合，再使用預先輸入功能。

@section styles{    <link href="~/Content/TypeHead.css" rel="external nofollow"  rel="stylesheet" />}<div>    <input type="text" placeholder="輸入城市名稱"></div>@section scripts{    <script src="~/Scripts/typeahead.bundle.js"></script>    <script type="text/javascript">$(function () {    $.getJSON("@Url.Action("GetCitiesJson","Home")", function(data) {if (data) {    $.each(data, function(index, city) {cities.push(city.Name);       });}    });    //預先輸入功能    $(".typeahead").typeahead({hint: true,highlight: true,minLength: 1    },    {name: "city",displayKey: "value",source: substringMatcher(cities)    });});var cities = [];//參數arr表示數據源 數組var substringMatcher = function (arr) {    return function findMatches(q, cb) {var substrRegex;var matches = [];substrRegex = new RegExp(q, "i");$.each(arr, function (i, ele) {    if (substrRegex.test(ele)) {matches.push({ value: ele });    }   });cb(matches);    };};    </script>}

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