问题
i have selectList with multiple attr which is filled through cascading(on select a company i just show selected Company Models) Now i want to allow user to select multiple models such that on select, item should add in c# list and display in page and then allow user to select more of any other company.Picture attached Following is my code. OrderViewModel
public class OrderViewModel
{
[Display(Name ="Order ID")]
public int order_id { get; set; }
[Required]
public string cus_name { get; set; }
public string cus_phone { get; set; }
public System.DateTime Date { get; set; }
[DataType(DataType.Date)]
public System.DateTime Date { get; set; }
public int Amount { get; set; }
public List<Products> Products { get; set; }
}
i want to bind selected Item in 'Products' List of OrderViewModel which will be send to server with Further fields. Products
public class Products
{
public int id { get; set; }
public int modelId { get; set; }
public int Phoneid { get; set; }
public int Quantity { get; set; }
public double price { get; set; }
public bool isSelected { get; set; }
public int order_id { get; set; }
}
Razor View
<div class="form-group row">
<label class="control-label col-6">Company Name</label>
<div class="col-12">
<select id="CompanyId" class="custom-select mr-sm-2"
asp-items="@(new SelectList( @ViewBag.Companies,"Phoneid","Com_name"))">
<option value="">Please Select</option>
</select>
</div>
<span class="text-danger"></span>
</div>
<div class="form-group row">
<label class="control-label col-6"></label>
<div class="col-12">
<select id="modelId" multiple class="custom-select mr-sm-2"
asp-items="@(new SelectList(string.Empty,"modelId","model_name","--Select--"))">
<option value="">Please Select</option>
</select>
</div>
<span class="text-danger"></span>
</div>
what i have tried yet to add item in list
<script>
$("#modelId").change(function () {
var list = @(Model.Products);
let item = $(this).children("option:selected").val();
list.forEach(x => {
if (x.modelId != item) {
@{
Products products = new Products()
{
isSelected=true,
modelId= item,
};
Model.Products.Add(products);
}
}
});
})
@for (int i = 0; i < Model.Products.Count; i++)
{
}
</script>
I display all selected product throught partial view now i just want to send these selected products along with Quanity and Price of each to Server
回答1:
Here is a working demo like below:
Model:
public class Model
{
[Key]
public int modelId { get; set; }
[Display(Name = "Model Name")]
public string model_name { get; set; }
public int Phoneid { get; set; }
public IList<Products> Products { get; set; }
}
public class Company
{
[Key]
public int Phoneid { get; set; }
[Display(Name = "Company Name")]
public string Com_name { get; set; }
}
public class Products
{
public int id { get; set; }
public int modelId { get; set; }
public int Phoneid { get; set; }
public int Quantity { get; set; }
public double price { get; set; }
public bool isSelected { get; set; }
public int order_id { get; set; }
}
View(Index.cshtml):
@model Products
<div>
<div style="float:left;width:40%">
<form id="form">
<div class="form-group row">
<label>Company Name</label>
<div class="col-12">
<select id="CompanyId" asp-for="Phoneid" class="custom-select mr-sm-2"
asp-items="@(new SelectList( @ViewBag.Companies,"Phoneid","Com_name"))">
<option value="">Please Select</option>
</select>
</div>
</div>
<div class="form-group row">
<label>Model Name</label>
<div class="col-12">
<select id="modelId" multiple class="custom-select mr-sm-2" name="modelId"
asp-items="@(new SelectList(string.Empty,"modelId","model_name","--Select--"))">
<option value="">Please Select</option>
</select>
</div>
</div>
<div>
<input type="button" id="saveBtn" value="Save" />
</div>
</form>
</div>
<div style="float:right;width:60%">
<h5>Products</h5>
<div id="products"></div>
</div>
</div>
@section Scripts
{
<script>
$(function () {
$('#CompanyId').change(function () {
var data = $("#CompanyId").val();
console.log(data);
$.ajax({
url: '/Home/GetModel?Phoneid=' + $("#CompanyId").val(),
type: 'Get',
success: function (data) {
var items = "<option value='0'>Select</option>";
$.each(data, function (i, item) {
items += "<option value='" + item.value + "'>" + item.text + "</option>";
});
$('#modelId').html(items);
}
})
});
$('#saveBtn').click(function () {
$.ajax({
url: '/Home/GetProduct?Phoneid=' + $("#CompanyId").val() + "&modelId=" + $('#modelId').val(),
type: 'Post',
success: function (data) {
$('#products').html(data);
}
})
})
})
</script>
}
Partial View(_Partial.cshtml):
@model IEnumerable<Products>
<table class="table">
<tbody>
@foreach (var item in Model)
{
<tr>
<td>check</td>
<td>
<input asp-for="@item.isSelected" />
</td>
<td>Product Id</td>
<td>
@Html.DisplayFor(modelItem => item.id)
</td>
</tr>
<tr>
<td>Quantity</td>
<td>
@Html.DisplayFor(modelItem => item.Quantity)
</td>
<td>Price</td>
<td>
@Html.DisplayFor(modelItem => item.price)
</td>
</tr>
}
</tbody>
</table>
Controller:
public class HomeController : Controller
{
private readonly MvcProj3Context _context;
public HomeController(MvcProj3Context context)
{
_context = context;
}
public IActionResult Index()
{
ViewBag.Companies = _context.Company.ToList();
return View();
}
public JsonResult GetModel(int Phoneid)
{
List<Model> model = new List<Model>();
model = (from m in _context.Model
where m.Phoneid == Phoneid
select m).ToList();
return Json(new SelectList(model, "modelId", "model_name"));
}
[HttpPost]
public IActionResult GetProduct(int Phoneid, string[] modelId)
{
var data = new List<Products>();
var ids = modelId[0].Split(',');
foreach(var item in ids)
{
var id = int.Parse(item);
//guess the modelA in CompanyA contains several products
var product = (from p in _context.Products
where p.Phoneid == Phoneid && p.modelId == id
select p).ToList();
foreach (var pro in product)
{
data.Add(pro);
}
}
return PartialView("_Partial", data);
}
}
Result:
来源：https://stackoverflow.com/questions/61962733/add-item-to-c-sharp-list-on-selectchange-loaded-through-cascading