我有一个 DropDownListFor,当选择不同的 elementID/值时,应使用从 GET ActionResult 返回的模型数据填充相关元素,或者如果未选择任何值,则清除相关 TextBoxFor 中的条目。从 DropDownListFor 传递到 ActionResult 的字符串 ID 始终为 null,从而生成错误。我尝试过使用变量进行 AJAX 数据调用、对数据进行字符串化并阅读许多 StackOverflow 问题,但仍然出现 null 异常。我是 jQuery 新手,所以有人能明白为什么数据不包含值吗?
View :
<div class="row">
<div class="col-lg-4">
@Html.LabelFor(m => m.AccountOwnerID, "Account Owner Name", new { @class = "req" })
@Html.DropDownListFor(m => m.AccountOwnerID, Model.AccountOwners, "--New Owner--")
</div>
<div class="col-lg-4" id="AccountOwnerName">
@Html.LabelFor(m => m.AccountOwner.AccountOwnerName, new { @class = "req"})
@Html.TextBoxFor(m => m.AccountOwner.AccountOwnerName)
</div>
</div>
<div class="row">
<div class="col-lg-6" id="AccountOwnerPhoneNumber">
@Html.LabelFor(m => m.AccountOwner.AccountOwnerPhoneNumber, "Owner Phone Number")
@Html.TextBoxFor(m => m.AccountOwner.AccountOwnerPhoneNumber, new { @class = "form-control", data_parsley_required = "true" })
</div>
<div class="col-lg-6" id="AccountOwnerEmail">
@Html.LabelFor(m => m.AccountOwner.AccountOwnerEmail, "Owner E-Mail Address")
@Html.TextBoxFor(m => m.AccountOwner.AccountOwnerEmail, new { @class = "form-control", data_parsley_required = "true" })
</div>
</div>
@section Scripts{
<script src="~/Scripts/jquery-2.1.3.js"></script>
<script src="/Scripts/jquery-ui-1.11.4.js"></script>
<script>
$("#AccountOwnerID").change(function () {
var $ownerName = $("#AccountOwner\\.AccountOwnerName"),
$ownerEmail = $("#AccountOwner\\.AccountOwnerEmail"),
$ownerPhone = $("#AccountOwner\\.AccountOwnerPhoneNumber"),
$ownerValue = $("#AccountOwnerID").val(),
$aOID = { ownerID : $ownerValue };
if (this.value >= 1) {
$.ajax({
type: "GET",
url: '/Sales/GetAccountOwnerInfo',
data: JSON.stringify($aOID),
success: function (data) {
//Fill data
$ownerName = data.AccountOwnerName;
$ownerEmail = data.AccountOwnerEmail;
$ownerPhone = data.AccountOwnerPhoneNumber;
}
});
}
else {
//clear fields
$ownerName.val('');
$ownerEmail.val('');
$ownerPhone.val('');
}
}).change();
</script>
Controller ,返回一个模型,其中包含 AJAX 成功分配给 TextBoxFor(s) 的元素:
public ActionResult GetAccountOwnerInfo(string ownerID)
{
Int64 accountOwnerID = 0;
Int64.TryParse(ownerID, out accountOwnerID);
ProjectEntities projectDB = new ProjectEntities();
var owner = projectDB.uspGetAccountOwnerInformation(accountOwnerID).FirstOrDefault();
AccountOwnersModel accountOwner = new AccountOwnersModel()
{
AccountOwnerID = owner.AccountOwnerID,
AccountOwnerName = owner.AccountOwnerName,
AccountOwnerEmail = owner.AccountOwnerEmail,
AccountOwnerPhoneNumber = owner.AccountOwnerPhone,
};
return Json(accountOwner, JsonRequestBehavior.AllowGet);
}
最佳答案
首先$ownerName = $("#AccountOwner\\.AccountOwnerName"),
将意味着 $ownerName
未定义,因为您没有任何带有 id="AccountOwner\\.AccountOwnerName"
的元素。 html 帮助器方法生成 id
属性,方法是使用替换任何 .
(以及 [
和 ]
字符)在属性名称中带有 _
以避免 jquery 出现问题。它需要是 $ownerName = $("#AccountOwner_AccountOwnerName")
其次,您不需要对数据进行字符串化(如果这样做,则需要指定 contentType: 'json',
ajax 选项)。应该是data: { ownerID: $(this.val() },
。注意 $(this)
的使用以避免再次搜索 DOM。
第三,$ownerName
是一个 jquery 元素,因此要设置其值,需要 $ownerName.val(data.AccountOwnerName);
旁注:您对 if (this.value >= 1)
的使用表明有什么问题。你的助手正在生成它的第一个选项 <option value="">--New Owner--</option>
所以你应该检查 null
.
你的脚本应该是
// cache the elements since you repeatedly accessing them
var ownerName = $("#AccountOwner_AccountOwnerName"),
ownerEmail = $("#AccountOwner_AccountOwnerEmail"),
ownerPhone = $("#AccountOwner_AccountOwnerPhoneNumber");
$("#AccountOwnerID").change(function () {
if ($(this).val()) {
$.ajax({
type: "GET",
url: '@Url.Action("GetAccountOwnerInfo", "Sales")', // don't hard code your url's
data: { ownerID: $(this).val() },
success: function (data) {
// Fill data
ownerName.val(dataAccountOwnerName);
ownerEmail.val(data.AccountOwnerEmail);
ownerPhone.val(data.AccountOwnerPhoneNumber);
}
});
} else {
// clear fields
ownerName.val('');
ownerEmail.val('');
ownerPhone.val('');
}
})
旁注:由于您传递的值是 int
对于该方法,您的方法参数应该是 int ownerID
。另外,您不需要 AccountOwnerID
的值在响应中,这样您就可以在 Controller 中创建一个匿名对象
public ActionResult GetAccountOwnerInfo(int ownerID)
{
ProjectEntities projectDB = new ProjectEntities();
var owner = projectDB.uspGetAccountOwnerInformation(ownerID).FirstOrDefault();
var data = new
{
AccountOwnerName = owner.AccountOwnerName,
AccountOwnerName = owner.AccountOwnerName,
AccountOwnerPhoneNumber = owner.AccountOwnerPhone
};
return Json(data, JsonRequestBehavior.AllowGet);
}
关于javascript - AJAX Get 向 ActionResult 发送 null 变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32105936/