jQuery autocomplete 使用

推荐：http://www.cnblogs.com/Peter-Zhang/archive/2011/10/22/2221147.html
eg:
 1 $("#txtGrand").autocomplete("/AjaxHandlers/StudentContractHandler.ashx", {
 2        multiple: false,
 3        mustMatch: true,
 4         140,
 5        extraParams: { action: "subname", province: '0' },
 6        parse: function (data) {
 7            var parsed = [];
 8            if (data != "") {
 9                data = eval("(" + data + ")");
10                for (var i = 0; i < data.length; i++) {
11                    parsed[parsed.length] = {
12                        data: data[i],
13                        value: data[i].usercode,
14                        result: data[i].username //返回的结果显示内容
15                    };
16                }
17            }
18            return parsed;
19        },
20        formatItem: function (row, i, max) {
21            return "<div value='" + row.usercode + "' >" + row.userinfo + "</div>";
22        },
23        formatResult: function (row) {
24            return item.usercode;
25        }
26    }).result(function (event, item, formatted) {//选择后操作
27        if (document.getElementById("txtGrand").value != "") {
28            $("#visVal").val("");
29            $("#txtGrand").val(item.username);
31            $("#visVal").val(item.usercode);35        }
36    });