Question

我尝试让以下部件运行，但总是失败。目标是：如果选择了组合框中的目标，则mediaId的组合框应填充相应的值。此时我只是模仿mediaId组合框的值。谁能告诉我如何正确地组合它们？ Thx提前。

视图Medium.cshtml：

<script src="@Url.Content("~/Scripts/PartialLoad.js")" type="text/javascript"></script>
<div class="editor-label">
    @Html.LabelFor(model => model.Files[i].TargetId)
</div>
<div class="editor-field">
    @Html.DropDownListFor(model => model.Files[i].PTargetId, (ViewData["targets"] as SelectList).MakeSelection(Model.Files[i].PTargetId))
</div>
<div class="editor-label">
    @Html.LabelFor(model => model.Files[i].MediaId)
</div>
<div class="editor-field">
    @Html.DropDownListFor(model => model.Files[i].MediaId, (ViewData["mediaIds"] as SelectList).MakeSelection(1)) 
</div>

javascript partialload.js

$(document).ready(function () {
    $("#targets").change(function () { GetMValues("#targets", "#mediaIds"); });
});

function ClearDrop(objSource) {
    $(objSource).empty();
}

function GetMValues(objSource, objDest) {
    var url = '/GetMValues/';
    $.getJSON(url, { id: $(objSource).val() },
        function (data) {
            ClearDrop(objDest); $.each(data, function (index, optionData) {
                $(objDest).append("<option value='" + optionData.Value + "'>" + optionData.Text + "</option>");
            });
        });
}

homecontroller.cs

public ActionResult GetMValues(String id)
{
    int myId = 0;
    int.TryParse(id, out myId);

    var mediumIds = new List<long>();
    int max = myId + 3;
    // just to emulate the data in the list
    for ( long l = 1 ; l < max ; l++ ){
        mediumIds.Add(l);
    }
    var select = new SelectList(mediumIds, "PTargetId", "TargetId");
    return Json(select, JsonRequestBehavior.AllowGet); //allow get needed to allow get calls
}

Answer 1

此处您正在使用下拉列表的ID选择器：$("#targets")但您的下拉列表似乎没有此ID。也许你想为它分配一个id或一个类：

@Html.DropDownListFor(
    model => model.Files[i].PTargetId, 
    (ViewData["targets"] as SelectList).MakeSelection(Model.Files[i].PTargetId),
    new { id = "targets" }
)

但是因为这似乎是重复的，你不能拥有多个具有相同id的元素，所以类选择器可能更合适：

@Html.DropDownListFor(
    model => model.Files[i].PTargetId, 
    (ViewData["targets"] as SelectList).MakeSelection(Model.Files[i].PTargetId),
    new { @class = "targets" }
)

然后：

$(document).ready(function () {
    $(".targets").change(function () { 
        ...
    });
});

#mediaIds显然相同。

结合Razor，Ajax，JSON

1 个答案: