Question

我有一个页面，其中有LeagueDDL，ClubDDL，然后是玩家列表。我想要实现的是用户将选择联盟，之后俱乐部根据联盟的ID被绑定到第二个DDL，并且当用户也选择俱乐部时，玩家列表将被绑定到视图取决于ClubID。

到目前为止，我有以下内容： -

查看： -

<script type="text/javascript">

function populateClubsDropdown() {
    $("#ddlClubs").empty();
    var typeID = getLeagueID();
    $.getJSON('@Url.Action("GetClubsByLeague", "Footballer")?TypeID=' + typeID, function (result) {
        $.each(result, function () {
            $("<option>").attr("value", this.ClubID).text(this.Club).appendTo("#ddlClubs");
        });
    });
}

function getLeagueID() {
    var leagueID = $("#ddlLeagues").val();
    return leagueID;
}

</script>


@Html.DropDownListFor(model => model.League.LeagueID, Model.LeagueList, 
    new { id = "ddlLeagues", onChange = "$:populateClubsDropdown()" })
@Html.DropDownListFor(model => model.Club.ClubID, Model.ClubList, new { id = "ddlClubs" })

在我的控制器里我有： -

        public ViewResult Index()
    {
        League league = new League();
        string selected = "Please Select";
        model.LeagueList = model.PopulateLeagueDDL(selected, league, null);

        Club club = new Club();
        model.ClubList = model.PopulateClubDDL(selected, league, club, null);

        model.Footballers = db.Footballers.Include("Club").Include("Position").Include("Status").Include("Country");
        return View(model);
    }

       public JsonResult GetClubsByLeague(int LeagueID)
    {
        var result = footballersDAL.GetClubsByLeagueId(LeagueID).Select(
                c => new { ClubID = c.ClubID, Club = c.ClubName });
        JsonResult jsonResult = new JsonResult { Data = result, JsonRequestBehavior = JsonRequestBehavior.AllowGet };

        return jsonResult;
    }

当我第一次启动页面时，两个下拉列表都是正确的，但是当我更改LeagueDDL时，我得到一个空的第二个DDL。并且Json断点没有被击中。

我希望得到一些帮助，我无法弄清楚我的错误。

更新视图

<script type="text/javascript">

function populateClubsDropdown() {
    $("#ddlClubs").empty();
    var typeID = getLeagueID();
    $.getJSON('@Url.Action("GetClubsByLeague", "Footballer")?TypeID=' + typeID, function (result) {
        $.each(result, function () {
            $("<option>").attr("value", this.ClubID).text(this.Club).appendTo("#ddlClubs");
        });
    });
}

function getLeagueID() {
    var leagueID = $("#ddlLeagues").val();
    return leagueID;

$(function () {
        $('#ddlLeagues').change(populateClubsDropdown);
    });
}

@Html.DropDownListFor(model => model.League.LeagueID, Model.LeagueList,
            new { id = "ddlLeagues" })
@Html.DropDownListFor(model => model.Club.ClubID, Model.ClubList, new { id = "ddlClubs" })

Answer 1

看起来问题就在这里：

@Html.DropDownListFor(model => model.League.LeagueID, Model.LeagueList, 
new { id = "ddlLeagues", onChange="$:populateClubsDropdown()" }) //What is"$:"?!

更改为：

@Html.DropDownListFor(model => model.League.LeagueID, Model.LeagueList, 
new { id = "ddlLeagues", onChange = "populateClubsDropdown()" })

jQuery unobtrusive事件监听器的使用是更好的事件：

 <script>    
    function populateClubsDropdown() {
        $("#ddlClubs").empty();
        var typeID = getLeagueID();
        $.getJSON('@Url.Action("GetClubsByLeague", "Footballer")?TypeID=' + typeID, function (result) {
            $.each(result, function () {
                $("<option>").attr("value", this.ClubID).text(this.Club).appendTo("#ddlClubs");
            });
        });
    }

    $(function(){
        $('#ddlLeagues').change(populateClubsDropdown);
    });
</script>

@Html.DropDownListFor(model => model.League.LeagueID, Model.LeagueList, 
new { id = "ddlLeagues"})

@Html.DropDownListFor(model => model.Club.ClubID, Model.ClubList,
 new { id = "ddlClubs" })

<强>更新看起来你向行动发送了错误的参数：
应为LeagueID，但您发送TypeId〜

根据第一个ddl绑定第二个ddl

1 个答案: