jQuery autocomplete 使用

推荐 ：http://www.cnblogs.com/Peter-Zhang/archive/2011/10/22/2221147.html

eg:

 $("#txtGrand").autocomplete("/AjaxHandlers/StudentContractHandler.ashx", {
        multiple: false,
        mustMatch: true,
        width: 140,
        extraParams: { action: "subname", province: '0' },
        parse: function (data) {
            var parsed = [];
            if (data != "") {
                data = eval("(" + data + ")");
                for (var i = 0; i < data.length; i++) {
                    parsed[parsed.length] = {
                        data: data[i],
                        value: data[i].usercode,
                        result: data[i].username //返回的结果显示内容
                    };
                }
            }
            return parsed;
        },
        formatItem: function (row, i, max) {
            return "<div value='" + row.usercode + "' >" + row.userinfo + "</div>";
        },
        formatResult: function (row) {
            return item.usercode;
        }
    }).result(function (event, item, formatted) {//选择后操作
        if (document.getElementById("txtGrand").value != "") {
            $("#visVal").val("");
            $("#txtGrand").val(item.username);
            $("#visVal").val(item.usercode);        }
    });