在ASP.NET MVC 3中使用Ajax和JsonResult

Question

我需要使用ajax和Action获取字符串数组或列表,这是我的实现:

这是我在AccessMenuController中对Index动作的html Dom视图:

<div class="RoleAccess">
   <select name="RoleDropDown">
    <option value="0">Select Role</option>
    <option value="61AD3FD9-C080-4BB1-8012-2A25309B0AAF">AdminRole</option>
    <option value="8A330699-57E1-4FDB-8C8E-99FFDE299AC5">Role2</option>
    <option value="004E39C2-4FFC-4353-A06E-30AC887619EF">Role3</option>
   </select>
</div>

我的控制器:

namespace MyProject.Areas.GlobalAccess.Controllers {

public class AccessMenuController : Controller {

    public ActionResult Index() { return View();}

    [HttpPost]
    public JsonResult RoleDropDownChanged(string roleId) {

     Guid RoleId = new Guid(roleId);

    //Some implement

    List<string> actions = new List<string>();
    for(int i = 0; i <= 10; i++) 
            actions.Add(i.ToString());

return Json(actions.ToArray(), JsonRequestBehavior.AllowGet);

   }
  }
}

和脚本:

$(document).ready(function () {

//Handle Checks of Actions by RoleName Changed
$('div.RoleAccess select').change(function () {
    RoleChangeHandler();
});

function RoleChangeHandler() {

    $.ajax({
        url: '@Url.Action("RoleDropDownChanged")',
        type: 'POST',
        data: { 'roleId': '61AD3FD9-C080-4BB1-8012-2A25309B0AAF' },
        dataType: 'json',
        processData: false,
        contentType: 'application/json; charset=utf-8',
        success: function (data) { SuccessRoleChangeHandler(data); },
        error: OnFailRoleChangeHandler
    });
    return false;
}


function SuccessRoleChangeHandler(data) {

    alert("in success role change");

}

function OnFailRoleChangeHandler(result) {
    alert('in OnFailRoleChangeHandler');

}

问题是所有下拉列表的更改只是Onfail函数运行并提醒我"在OnFailRoleChangeHandler"中,我也检查RoleDropDownChanged具有断点的 Action并且从不运行,问题出在哪里？

UPDATE

当我通过chrome加载页面时,控制台窗口中出现错误: http://MyProject/GlobalAccess/AccessMenu/@Url.Action(%22RoleDropDownChanged%22) 404 (Not Found) jquery-1.7.1.js:8102

Answer 1

删除此设置:

contentType: 'application/json; charset=utf-8',

您没有向服务器发送任何JSON.

如果要保留此设置,请确保向服务器发送有效的JSON:

data: JSON.stringify({ 'roleId': '61AD3FD9-C080-4BB1-8012-2A25309B0AAF' })

所以:

$.ajax({
    url: '@Url.Action("RoleDropDownChanged")',
    type: 'POST',
    data: { 'roleId': '61AD3FD9-C080-4BB1-8012-2A25309B0AAF' },
    success: SuccessRoleChangeHandler,
    error: OnFailRoleChangeHandler
});

应该工作(至少它对我来说)有以下行动:

[HttpPost]
public ActionResult RoleDropDownChanged(Guid roleId) 
{
    var actions = Enumerable.Range(1, 10).Select(x => x.ToString()).ToList();
    return Json(actions);
}

更新:

根据您的评论,您似乎试图在单独的javascript中使用服务器端助手,这是不可能的.这是我建议你的.首先在生成下拉列表时提供url:

<div class="RoleAccess">
    @Html.DropDownListFor(
        x => x.RoleDropDown, 
        Model.Roles, 
        "-- Select role --",
        new { 
            data_url = Url.Action("RoleDropDownChanged") 
        }
   )
</div>

然后在你单独的javascript文件中:

$(document).ready(function() {
    $('div.RoleAccess select').change(function () {
        var url = $(this).data('url');
        $.ajax({
            url: url,
            type: 'POST',
            data: { 'roleId': '61AD3FD9-C080-4BB1-8012-2A25309B0AAF' },
            success: function(result) {
                alert('success');
            },
            error: function() {
                alert('error');
            }
        });        
    });    
});

然后你当然可以用当前选择的值替换硬编码的roleId:

data: { 'roleId': $(this).val() }