[英]Knockout dropdownlist databind is not working in ajax call
I try to bind a dropdownlist in knockout with MVC 4. Please see my code below. 我尝试使用MVC 4绑定下拉列表中的下拉列表。请参阅下面的代码。
Action 行动
public JsonResult GetUserTypes()
{
using (QuestApplicationEntities db = new QuestApplicationEntities())
{
var usertypes = (from usertype in db.UserTypes
select new
{
usertype.Id,
usertype.Name
}).ToArray();
return Json(usertypes, JsonRequestBehavior.AllowGet);
}
}
Knockout.js Knockout.js
var Register =
{
Name: ko.observable("Ragesh"),
Email: ko.observable().extend({ email: true }),
Password: ko.observable(),
UserTypes: ko.observableArray([]),
UserType: ko.observable(),
SaveRegistration: function () {
//alert('saved');
$.ajax({
url: '/Home/RegisterUser',
type: 'post',
datatype: 'json',
data: ko.toJSON(this),
contentType: 'application/json',
success: function () {
alert('saved');
}
});
}
};
$.ajax({
url: '/Home/GetUserTypes',
type: 'post',
datatype: 'json',
data: ko.toJSON(this),
contentType: 'application/json',
success: function () {
ko.mapping.fromJS(data,Register.UserTypes);
}
});
ko.applyBindings(Register);
Html HTML
<h4>Register</h4>
<fieldset>
<legend>New User Registration</legend>
<div class="editor-label">
Name
</div>
<div class="editor-field">
<input data-bind="value:Name" />
</div>
<div class="editor-label">
Email
</div>
<div class="editor-field">
<input data-bind="value:Email" />
</div>
<div class="editor-label">
User Type
</div>
<div class="editor-field">
<select data-bind="options: UserTypes, value: UserType, optionsCaption: 'Select User Type...'">
</select>
</div>
<p>
<button type="button" data-bind="click:SaveRegistration">Register</button>
</p>
</fieldset>
<script src="~/Scripts/knockout-2.2.1.js"></script>
<script src="~/Scripts/knockout.validation.js"></script>
<script src="~/Scripts/App/Register.js"></script>
But the GetUserTypes action is not fired. 但是不会触发GetUserTypes操作。
And there is another error show in the firebug . 在萤火虫中还有另一个错误显示。
Please help. 请帮忙。
I think the list is not getting to data variable. 我认为列表没有达到数据变量。 so the data variable must be null. 所以数据变量必须为null。
try this. 尝试这个。 add data parameter in the success function 在success函数中添加data参数
$.ajax({
url: '/Home/GetUserTypes',
type: 'post',
datatype: 'json',
data: ko.toJSON(this),
contentType: 'application/json',
success: function (data) {
ko.mapping.fromJS(data,Register.UserTypes);
}
});
Your action GetUserTypes
doesn't expected any parameters, but you pass viewModel object: 您的操作GetUserTypes
不期望任何参数,但您传递viewModel对象:
....
$.ajax({
url: '/Home/GetUserTypes',
type: 'post',
datatype: 'json',
data: ko.toJSON(this),
...
Try to remove this property from ajax call. 尝试从ajax调用中删除此属性。
About error in FireBug , just include jQuery script in your page. 关于FireBug中的错误 ,只需在页面中包含jQuery脚本即可。
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