如何使用 Ajax 錯誤處理創建級聯下拉選單
創建下拉國家州和地區
1.當我點擊國家它顯示狀態。
2.當我點擊狀態它顯示區。
public class Country
{
public int CountryId { get; set; }
public string CountryName { get; set; }
}
public class District
{
public int DistrictId { get; set; }
public string DistrictName { get; set; }
}
public class State
{
public int StateId { get; set; }
public string StateName { get; set; }
}
控制器
namespace Dropdown.Controllers
{
public class CascadingController : Controller
{
private readonly DropdownContext _context;
public CascadingController(DropdownContext context)
{
_context = context;
}
public IActionResult Index()
{
return View();
}
public IActionResult DropDown()
{
ViewBag.Country = _context.Country.ToList();
ViewBag.District = _context.District.ToList();
ViewBag.State = _context.State.ToList();
return View();
}
}
}
這是我的結合課
public class Combine
{
public int CombineId { get; set; }
public int CountryId { get; set; }
public int StateId { get; set; }
public int DistrictId { get; set; }
public Country Country { get; set; }
public State State { get; set; }
public District District { get; set; }
}
看法
這是查看頁面我只添加表單 html 以顯示下拉串列我不添加 jQuery 或其他東西
@model Dropdown.Models.Combine
@{
ViewData["Title"] = "DropDown";
}
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<html>
<head>
</head>
<body>
<h1>DropDown</h1>
<hr />
<form>
<div class="row">
<div class="col-md-4">
<div class="form-group" style="padding-top: 8px;padding-right:7px;">
<label asp-for="Country" class="control-label"></label>
<br />
<select asp-for="CountryId" class="form-control" asp-items="@(new SelectList(ViewBag.Country,"CountryId","CountryName"))">
</select>
</div>
<br />
<div class="form-group" style="padding-top: 8px;padding-right:7px;">
<label asp-for="District" class="control-label"></label>
<br />
<select asp-for="DistrictId" class="form-control" asp-items="@(new MultiSelectList(ViewBag.District,"DistrictId","DistrictName"))">
</select>
</div>
<br />
<div class="form-group" style="padding-top: 8px;padding-right:7px;">
<label asp-for="State" class="control-label"></label>
<br />
<select asp-for="StateId" class="form-control" asp-items="@(new SelectList(ViewBag.State,"StateId","StateName"))">
</select>
</div>
<br />
<input type="submit" value="Create" class="btn btn-primary form-group" />
</div>
</div>
</form>
</body>
</html>
<br>
<div>
<a asp-action="Index">Back to List</a>
</div>
@section Scripts {
<script><script type="text/javascript">
</script>
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
Controller:
public IActionResult Index()
{
return View();
}
[HttpGet]
public async Task<ActionResult> LoadCountry()
{
var country = ListOfCountry.ToList();
return Ok(country);
}
[HttpGet]
public async Task<ActionResult> GetState(int countryId)
{
var state = ListOfState.Where(cId => cId.CountryId == countryId).ToList() ;
return Ok(state);
}
[HttpGet]
public async Task<ActionResult> GetDistrict(int stateId)
{
var state = ListOfDistrict.Where(cId => cId.StateId == stateId).ToList();
return Ok(state);
}
[HttpPost]
public async Task<IActionResult> AddCountryStateDistrict(SubmitModel model)
{
return RedirectToAction("Index");
}
Views:
<div class="form-group">
<label class="col-md-4 control-label">Country</label>
<div class="col-md-6">
<select class="form-control" id="ddlCountry"></select><br />
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label">State</label>
<div class="col-md-6">
<select class="form-control" id="ddlState"></select>
<br />
</div>
</div>
<br />
<div class="form-group">
<label class="col-md-4 control-label">District</label>
<div class="col-md-6">
<select class="form-control" id="ddlDistrict"></select>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label"></label>
<div class="col-md-6">
<input id="Submit" value="Submit" class="btn btn-primary" />
</div>
</div>
</div>
<div class="col-lg-3"></div>
</div>
Scripts:
@section scripts {
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.2.1.min.js"></script>
<script src="https://cdn.datatables.net/1.11.3/js/jquery.dataTables.min.js"></script>
<script>
$(document).ready(function () {
var ddlCountry = $('#ddlCountry');
ddlCountry.append($("<option></option>").val('').html('Please Select Country'));
$.ajax({
url: 'http://localhost:5094/CascadingDropdown/LoadCountry',
type: 'GET',
dataType: 'json',
success: function (d) {
console.log(d);
$.each(d, function (i, country) {
console.log(i);
console.log(country);
ddlCountry.append($("<option></option>").val(country.countryId).html(country.countryName));
});
},
error: function () {
alert('Error!');
}
});
//State details by country id
$("#ddlCountry").change(function () {
//alert("On ddlCountry change");
var CountryId = parseInt($(this).val());
console.log(CountryId);
if (!isNaN(CountryId)) {
var ddlState = $('#ddlState');
ddlState.empty();
ddlState.append($("<option></option>").val('').html('Please wait ...'));
$.ajax({
url: 'http://localhost:5094/CascadingDropdown/GetState',
type: 'GET',
dataType: 'json',
data: { CountryId: CountryId },
success: function (d) {
ddlState.empty(); // Clear the please wait
ddlState.append($("<option></option>").val('').html('Select State'));
$.each(d, function (i, states) {
ddlState.append($("<option></option>").val(states.stateId).html(states.stateName));
});
},
error: function () {
alert('Error!');
}
});
}
});
//District Bind By satate id
$("#ddlState").change(function () {
var StateId = parseInt($(this).val());
if (!isNaN(StateId)) {
var ddlDistrict = $('#ddlDistrict');
ddlDistrict.append($("<option></option>").val('').html('Please wait ...'));
$.ajax({
url: 'http://localhost:5094/CascadingDropdown/GetDistrict',
type: 'GET',
dataType: 'json',
data: { stateId: StateId },
success: function (d) {
ddlDistrict.empty(); // Clear the plese wait
ddlDistrict.append($("<option></option>").val('').html('Select District Name'));
$.each(d, function (i, districts) {
ddlDistrict.append($("<option></option>").val(districts.districtId).html(districts.districtName));
});
},
error: function () {
alert('Error!');
}
});
}
});
//On Submit Method
$("#Submit").click(function(){
var ddlCountry = parseInt($("#ddlCountry").val());
var ddlState = parseInt( $("#ddlState").val());
var ddlDistrict = parseInt($("#ddlDistrict").val());
var data = {
ddlCountry: ddlCountry,
ddlState: ddlState,
ddlDistrict: ddlDistrict
};
console.log(data);
$.ajax({
url: 'http://localhost:5094/CascadingDropdown/AddCountryStateDistrict',
type: 'POST',
dataType: 'json',
data: data,
success: function (d) {
alert("Submitted To Database");
},
error: function () {
alert('Error!');
}
});
});
});
</script>
}
Output:
希望這會相應地指導您，您要實作的目標
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標籤：C＃ asp.net-mvc asp.net 核心 asp.net-core-mvc
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