KnockOutJs对象不张贴 [英] KnockOutJs object not posting
问题描述
我通过KnockOutJs采样工作,我有与MVC3张贴的一些问题。我的示例使用一整页的回发时,正确的职位。当我尝试使用jQuery的一个阿贾克斯后保存,我可以看到张贴在使用Firebug NET观众是:
{礼物:[{GiftId:0,标题:悲,价格:3}]}
当我查看了ModelBinder的MVC3中的ControllerContext,表单参数为空并且json不绑定。任何想法发生了什么?
我已经尝试了多种配置,但这里是jQuery的发帖code(目前硬coded到一个静态值):
...
$阿贾克斯({
网址:/首页/ PartialUpdate
输入:POST,
缓存:假的,
数据:{礼物:[{GiftId:0,标题:悲,价格:3}]}',//ko.toJSON({礼物:this.gifts})
数据类型:JSON,
的contentType:应用/ JSON;,
成功:函数(结果){
警报(结果);
VAR数据= ko.utils.parseJson(结果);
this.gifts = ko.observableArray(数据);
},
错误:功能(XHR,ERR){
警报(readyState的:+ xhr.readyState +\\ n状态:+ xhr.status);
警报(responseText的:+ xhr.responseText);
}
});
编辑:这里是行动MVC3 code代表阿贾克斯更新code
[HttpPost]
公共JsonResult PartialUpdate([FromJson]的IEnumerable<礼品GT;礼品)
{
礼品赠品=?新的List<礼品GT;();
使用(VAR上下文=新KnockOutContext())
{
//添加记录,如果未在DB
的foreach(在礼品赠送VAR)
{
context.Entry(礼品).STATE =(gift.GiftId == 0)? EntityState.Added:EntityState.Modified;
} //如果不是在视图模型删除记录
的foreach(在context.Gifts VAR dbGift)
{
如果(gifts.SingleOrDefault(C => c.GiftId == dbGift.GiftId)== NULL)
context.Gifts.Remove(dbGift);
}
context.SaveChanges();
}
返回GetGifts_Json();
}
和全回传code,在工程(史蒂夫·桑德森的榜样
的http://blog.stevensanderson.com/2010/07/12/editing-a-variable-length-list-knockout-style/)
[HttpPost]
公众的ActionResult指数([FromJson]的IEnumerable<礼品GT;礼品)
{
SaveGifts(礼品);
返回RedirectToAction(「指数」);
}
使用
这个自定义模型粘结剂:
公共类FromJsonAttribute:CustomModelBinderAttribute
{
私人只读静态的JavaScriptSerializer串=新的JavaScriptSerializer(); 公众覆盖IModelBinder GetBinder()
{
返回新JsonModelBinder();
} 私有类JsonModelBinder:IModelBinder
{
公共对象BindModel(ControllerContext controllerContext,ModelBindingContext的BindingContext)
{
VAR字符串化= controllerContext.HttpContext.Request [bindingContext.ModelName]
如果(string.IsNullOrEmpty(字符串化))
返回null;
返回serializer.Deserialize(字符串化,bindingContext.ModelType);
}
}
}
我的猜测是,你开始与史蒂夫的下载,这是使用MVC2。 MVC2没有足够的<一个href=\"http://haacked.com/archive/2010/04/15/sending-json-to-an-asp-net-mvc-action-method-argument.aspx\"相对=nofollow> JsonValueProvider 通过默认注册。在 [FromJson]
属性旨在与已通过ko.utils.postJson(完全回发)提交的URL恩codeD JSON工作。通过AJAX使用正确的内容类型(MVC3)发布JSON时,这是没有必要的。
那么,做最简单的事情就是你的项目升级到MVC 3(省事这里),并移除部分更新了 [FromJson]
属性。
工作拷贝这里。
另外一个真正次要的事情:你的静态数据目前是无效的JSON('{礼物:[{GiftId:0,标题:悲,价格:3}] }
)。 礼品
将需要礼物
I am working through a KnockOutJs Sample and am having some posting problems with MVC3. My sample correctly posts when using a full page postback. When I try to save using an jQuery Ajax post, I can see the Post in the using Firebug NET viewer to be:
{ gifts:[{"GiftId":0,"Title":"sad","Price":3}] }
When I view the ControllerContext in the ModelBinder in MVC3, the form parameters are empty and the json does not bind. Any ideas as to what is happening?
I have tried a number of configurations but here is the jQuery posting code (currently hard-coded to a static value):
...
$.ajax({
url: "/Home/PartialUpdate",
type: 'POST',
cache: false,
data: '{ gifts:[{"GiftId":0,"Title":"sad","Price":3}] }', //ko.toJSON({ gifts: this.gifts }),
dataType: 'json' ,
contentType: "application/json;",
success: function(result){
alert(result);
var data = ko.utils.parseJson(result);
this.gifts = ko.observableArray(data) ;
},
error:function(xhr,err){
alert("readyState: " + xhr.readyState+"\nstatus: "+xhr.status);
alert("responseText: " + xhr.responseText);
}
});
Edit: Here is the MVC3 action code for the Ajax update code
[HttpPost]
public JsonResult PartialUpdate ([FromJson] IEnumerable<Gift> gifts)
{
gifts = gifts ?? new List<Gift>();
using (var context = new KnockOutContext())
{
// Add record if not in DB
foreach (var gift in gifts )
{
context.Entry(gift).State = (gift.GiftId == 0) ? EntityState.Added : EntityState.Modified;
}
// Delete records if not in ViewModel
foreach (var dbGift in context.Gifts)
{
if (gifts.SingleOrDefault(c => c.GiftId == dbGift.GiftId) == null)
context.Gifts.Remove(dbGift);
}
context.SaveChanges();
}
return GetGifts_Json();
}
And the full postback code that works (from Steve Sanderson's example at http://blog.stevensanderson.com/2010/07/12/editing-a-variable-length-list-knockout-style/)
[HttpPost]
public ActionResult Index([FromJson] IEnumerable<Gift> gifts)
{
SaveGifts(gifts);
return RedirectToAction("Index");
}
using this custom model binder:
public class FromJsonAttribute : CustomModelBinderAttribute
{
private readonly static JavaScriptSerializer serializer = new JavaScriptSerializer();
public override IModelBinder GetBinder()
{
return new JsonModelBinder();
}
private class JsonModelBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
var stringified = controllerContext.HttpContext.Request[bindingContext.ModelName];
if (string.IsNullOrEmpty(stringified))
return null;
return serializer.Deserialize(stringified, bindingContext.ModelType);
}
}
}
My guess is that you started with Steve's download, which is using MVC2. MVC2 did not have the JsonValueProvider registered by default. The [FromJson]
attribute was intended to work with URL-encoded JSON that was submitted via ko.utils.postJson (full postback). This is not necessary when posting JSON via AJAX with the correct content-type (in MVC3).
So, the easiest thing to do is upgrade your project to MVC 3 (easy way here) and remove the [FromJson]
attribute from your partial update.
Working copy here.
One other really minor thing: your static data is currently invalid JSON ('{ gifts:[{"GiftId":0,"Title":"sad","Price":3}] }'
). gifts
would need to be "gifts"
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