[英]How to call a string in a method using jquery ajax in asp.net mvc
我希望能够在ajax方法上使用“字符串”。
如果我使用“字符串”,如何在SQL语句上再次添加“ where”
有关更多信息,请参见此页面: https : //www.aspsnippets.com/Articles/Cascading-Dependent-Country-State-State-City-DropDownLists-using-jQuery-AJAX-in-ASPNet-MVC.aspx
型号代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.Mvc;
namespace tk3.Models
{
public class ViewModel
{
public ViewModel()
{
this.depart = new List<SelectListItem>();
this.department = new List<SelectListItem>();
this.gender = new List<SelectListItem>();
this.dryclean = new List<SelectListItem>();
}
public List<SelectListItem> depart { get; set; }
public List<SelectListItem> department { get; set; }
public List<SelectListItem> gender { get; set; }
public List<SelectListItem> dryclean { get; set; }
public int departId { get; set; }
public int typegenderId { get; set; }
public int genderId { get; set; }
public int btntagId { get; set; }
public int ServiceId { get; set; }
public int gendertypeId { get; set; }
}
}
Controlller:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using tk3.Models;
using System.Configuration;
using System.Data.SqlClient;
namespace tk3.Controllers
{
public class HomeController : Controller
{
// GET: Home
public ActionResult Index()
{
ViewModel model = new ViewModel();
model.depart = PopulateDropDown("SELECT * FROM depart", "servgend", "departId");
model.gender = PopulateDropDown("SELECT genderId, gender FROM gender", "gender", "genderId");
return View(model);
}
[HttpPost]
public JsonResult AjaxMethod(string type, int value)
{
ViewModel model = new ViewModel();
switch (type)
{
case "departId":
model.department = PopulateDropDown("SELECT btntagId, btntag FROM department WHERE departId = " + value, "btntag", "btntagId");
break;
case "btntagId":
model.dryclean = PopulateDropDown("SELECT typegenderId, type FROM dryclean WHERE btntagId = " + value, "type", "typegenderId");
break;
case "genderId":
model.dryclean = PopulateDropDown("SELECT genderId, type FROM dryclean WHERE typegenderId = " + value, "type", "genderId");
break;
case "typegenderId":
model.dryclean = PopulateDropDown("SELECT genderId, price FROM dryclean WHERE genderId = " + value, "price", "genderId");
break;
}
return Json(model);
}
[HttpPost]
public ActionResult Index(int departId, int btntagId, int typegenderId, int genderId, int gendertypeId, int ServiceId)
{
ViewModel model = new ViewModel();
model.depart = PopulateDropDown("SELECT departId, servgend FROM depart", "servgend", "departId");
model.gender = PopulateDropDown("SELECT genderId, gender FROM gender", "gender", "genderId");
model.department = PopulateDropDown("SELECT btntagId, btntag FROM department WHERE departId = " + departId, "btntag", "btntagId");
model.dryclean = PopulateDropDown("SELECT typegenderId, type FROM dryclean WHERE btntagId = " + btntagId, "type", "typegenderId");
model.dryclean = PopulateDropDown("SELECT genderId, type FROM dryclean WHERE typegenderId = " + typegenderId, "type", "genderId");
model.dryclean = PopulateDropDown("SELECT genderId, price FROM dryclean WHERE genderId = " + genderId, "price", "genderId");
return View(model);
}
private static List<SelectListItem> PopulateDropDown(string query, string textColumn, string valueColumn)
{
List<SelectListItem> items = new List<SelectListItem>();
string constr = ConfigurationManager.ConnectionStrings["tk"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand(query))
{
cmd.Connection = con;
con.Open();
using (SqlDataReader sdr = cmd.ExecuteReader())
{
while (sdr.Read())
{
items.Add(new SelectListItem()
{
Text = sdr[textColumn].ToString(),
Value = sdr[valueColumn].ToString()
});
}
}
con.Close();
}
}
return items;
}
}
}
CSHTML:
@model tk3.Models.ViewModel
@{
ViewBag.Title = "Index";
}
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Request</title>
</head>
<body>
@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
<br />
<br />
@Html.DropDownListFor(m => m.departId, Model.depart, "Please select department")
<br />
<br />
@Html.DropDownListFor(m => m.btntagId, Model.department, "Please select service")
<br />
<br />
@Html.DropDownListFor(m => m.genderId, Model.gender, "Please select gender")
<br />
<br />
@Html.DropDownListFor(m => m.typegenderId, Model.dryclean, "Please select item")
<br />
<br />
@Html.DropDownListFor(m => m.ServiceId, Model.dryclean, "Please select item")
}
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
$(function () {
$("select").each(function () {
if ($(this).find("option").length <= 1) {
$(this).attr("disabled", "disabled");
}
});
$("select").change(function () {
var value = 0;
if ($(this).val() != "") {
value = $(this).val();
}
var id = $(this).attr("id");
$.ajax({
type: "POST",
url: "/Home/AjaxMethod",
data: '{type: "' + id + '", value: ' + value + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
var dropDownId;
var list;
switch (id) {
case "departId":
list = response.department;
DisableDropDown("#btntagId");
//DisableDropDown("#id");
PopulateDropDown("#btntagId", list);
break;
case "btntagId":
list = response.dryclean;
DisableDropDown("#typegenderId");
//DisableDropDown("#id");
PopulateDropDown("#typegenderId", list);
break;
case "genderId":
list = response.dryclean;
DisableDropDown("#typegenderId");
//DisableDropDown("#id");
PopulateDropDown("#typegenderId", list);
break;
case "typegenderId":
list = response.dryclean;
DisableDropDown("#ServiceId");
//DisableDropDown("#id");
PopulateDropDown("#ServiceId", list);
break;
}
},
failure: function (response) {
alert(response.responseText);
},
error: function (response) {
alert(response.responseText);
}
});
});
});
function DisableDropDown(dropDownId) {
$(dropDownId).attr("disabled", "disabled");
$(dropDownId).empty().append('<option selected="selected" value="0">Please select</option>');
}
function PopulateDropDown(dropDownId, list) {
if (list != null && list.length > 0) {
$(dropDownId).removeAttr("disabled");
$.each(list, function () {
$(dropDownId).append($("<option></option>").val(this['Value']).html(this['Text']));
});
}
}
</script>
因此,我想在控制器上实现以下类似功能,并能够在Ajax代码上执行它
例:
[HttpPost]
public JsonResult AjaxMethod(string type, int value, string value2)
{
ViewModel model = new ViewModel();
switch (type)
{
case "departId":
model.department = PopulateDropDown("SELECT btntagId, btntag FROM department WHERE departId = " + value + "AND WHHERE services = " + value2, "btntag", "btntagId");
break;
}
请尝试以下ajax。
url: "/Home/AjaxMethod",
type:"POST",
data:JSON.stringify({type: id, value: value}),
success: function (response)
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