MVC - 级联下拉列表 - 如何获取所选值?

时间:2013-03-31 18:33:44

标签: javascript jquery asp.net-mvc-4

我有一个带有级联下拉列表的View的MVC应用程序。在用户在第一个下拉列表中选择了值之后,我有以下Ajax调用来检索第二个下拉列表的数据:

function GetAutoModel(_manufacturerId) {

    var autoSellerListingId = document.getElementById("AutoSellerListingId").value;

    $.ajax({
        url: "/AutoSellerListing/GetAutoModel/",
        data: { manufacturerId: _manufacturerId, autoSellerListingId: autoSellerListingId },
        cache: false,
        type: "POST",
        success: function (data) {
            var markup = "<option value='0'>-- Select --</option>";
            for (var x = 0; x < data.length; x++) {
                markup += "<option value=" + data[x].Value + ">" + data[x].Text + "</option>";
            }

            $('#ModelList').html(markup).show();
        },
        error: function (reponse) {
            alert("error : " + reponse);
        }
    });
}

调用以下控制器代码来提供Ajax调用数据:

[HttpPost]
public ActionResult GetAutoModel(int manufacturerId, int autoSellerListingId)
{
    int modelId = 0;

    // Get all the models associated with the target manufacturer
    List<AutoModel> modelList = this._autoLogic.GetModelListByManufacturer(manufacturerId);

    // If this is an existing listing, get the auto model Id value the seller selected.
    if (autoSellerListingId > 0)
        modelId = this._systemLogic.GetItem<AutoSellerListing>(row => row.AutoSellerListingId == autoSellerListingId).AutoModel.AutoModelId;

    // Convert all the model data to a SelectList and return it
    SelectList returnList = new SelectList(modelList, "AutoModelId", "Description", modelId);

    return Json(returnList);
}

注意控制器代码(modelId)中new SelectList()调用中的最后一个参数。这就是我希望在Ajax调用中创建select对象后将所选值设置为。问题是我不知道如何在客户端中访问此值。一切正常,我只是不知道如何访问所选值,然后设置它。

1 个答案:

答案 0 :(得分:2)

  

问题是我不知道如何在客户端访问此值。

您可以查看客户端上的Selected布尔属性:

if (data[x].Selected) {
    markup += "<option value=" + data[x].Value + " selected=\"selected\">" + data[x].Text + "</option>";
} else {
    markup += "<option value=" + data[x].Value + ">" + data[x].Text + "</option>";
}