显示信息取决于下拉选择-MVC 5

Question

我有这样的产品模型

public class ProductViewModel
{
    public int Id { get; set; }
    public string Description { get; set; }
    public bool IsActive { get; set; }
    public ProductTypeFlag ProductType { get; set; }

    public string BikeMake { get; set; }
    public string BikeModel { get; set; }

    public string CarMake { get; set; }
    public string CarModel { get; set; }

    public string TrainMake { get; set; }
    public string TrainModel { get; set; }
}

public enum ProductTypeFlag
{
    Bike = 0,
    Car = 1,
    Train = 2
}

如您所见，我只有三种产品可供选择：自行车，汽车或火车。

我的创建新产品视图当前看起来像这样...在这里，我有一个下拉列表用于ProductType

 @model WebApplication14.Models.ProductViewModel @{ ViewBag.Title = "Create"; } <h2>Create</h2> @using (Html.BeginForm()) { @Html.AntiForgeryToken() <div class="form-horizontal"> <h4>ProductViewModel</h4> <hr /> @Html.ValidationSummary(true, "", new { @class = "text-danger" }) <div class="form-group"> @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.IsActive, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> <div class="checkbox"> @Html.EditorFor(model => model.IsActive) @Html.ValidationMessageFor(model => model.IsActive, "", new { @class = "text-danger" }) </div> </div> </div> <div class="form-group"> @Html.LabelFor(model => model.ProductType, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EnumDropDownListFor(model => model.ProductType, htmlAttributes: new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.ProductType, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.BikeMake, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.BikeMake, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.BikeMake, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.BikeModel, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.BikeModel, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.BikeModel, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.CarMake, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.CarMake, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.CarMake, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.CarModel, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.CarModel, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.CarModel, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.TrainMake, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.TrainMake, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.TrainMake, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.TrainModel, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.EditorFor(model => model.TrainModel, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.TrainModel, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> <div class="col-md-offset-2 col-md-10"> <input type="submit" value="Create" class="btn btn-default" /> </div> </div> </div> } <div> @Html.ActionLink("Back to List", "Index") </div> @section Scripts { @Scripts.Render("~/bundles/jqueryval") } 

现在，我要做的是仅显示与所选产品相关的产品信息。 例如，如果我选择“自行车”作为产品，那么我只希望看到可用的BikeMake和BikeModel-即，我不想看到“汽车/火车/模型”不存在，因为它不相关。

Answer 1

您可以将与每种车辆类型相关的属性分组到一个容器div中，并根据下拉菜单中的选择有条件地隐藏/显示。

例如

<div my-section="section-0" style="display:none;">
   <div class="form-group">
        @Html.LabelFor(model => model.BikeMake, new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.BikeMake, new { @class = "form-control" } )
            @Html.ValidationMessageFor(model => model.BikeMake)
        </div>
   </div>
</div>
<div my-section="section-1" style="display:none;">
   <!-- Inputs for code car related fields goes here -->
</div>
<div my-section="section-2" style="display:none;">
   <!-- Inputs for Train related fields goes here -->
</div>

现在，侦听SELECT元素上的change事件，并仅显示该容器div。

$(function () {

    // Show the section for the current(default) selection of the dropdown
    var t = $("#ProductType").val();  
    var item = $("[my-section='section-" + t + "']").show();

    // Wire up change event code for dropdown
    $("#ProductType").change(function (e) {
        // Hide all the sections (including previously shown)
        $("[my-section]").hide();

        //Select only the section corresponding the the dropdown selection
        var item = $("[my-section='section-" + $(this).val() + "']").show(); 
    })
});

例如，如果您在下拉菜单中选择第二个项目，则jQuery选择器代码$("[my-section='section-" + $(this).val() + "']")将返回div和my-section属性值设置为"section-1"