ModelState中使用Ajax表

问题描述

我使用AJAX的形式来更新项目数据库。当它被完成时，它返回重新列出了所有的项目，并在表中显示它们的局部视图。当我要在我的控制器操作添加的ModelState错误时，会出现问题。我不希望返回的项目列表，因为我想用ValidationMessage向用户展示错误时，有一个的ModelState错误。我的想法是，我可以做这样的事情在我的控制器：

I'm using an AJAX form to update an item to the database. When it gets done, it returns a partial view that re-lists all the items and displays them all in a table. The problem occurs when I have to add a modelstate error in my controller action. I don't want to return the list of items when there is a modelstate error because I want to show the user the error using the ValidationMessage. My thinking is that I could do something like this in my controller:

       [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult UpdateNewsItem(int newsID, string newsTitle, string newsDescription, string newsBeginningDate, string newsEndingDate)
    {
        List<Models.News> lstNewsItem = new List<News>();

        //we need to grab the member so we can capture the user id
        //for the corresponding news property
        MembershipUser member = Membership.GetUser(User.Identity.Name);

        //the news instance to use in case the viewdata is invalid
        Models.News newsError = new Models.News();

        //create the datetime objects
        DateTime dtBeginningDate = DateTime.MinValue;
        DateTime dtEndingDate = DateTime.MaxValue;

        //the message we want to send whenever the user enters an invalid date
        string strInvalidDateError = "Invalid date.  Please use a format like '12/25/2008'";

        //clean user input
        newsTitle = Models.clsGlobals.CleanString(newsTitle);
        newsDescription = Models.clsGlobals.CleanParagraph(newsDescription);

        //newsTitle
        if (string.IsNullOrEmpty(newsTitle))
        {
            newsError.Title = string.Empty;
            ModelState.AddModelError("newsTitle", "You must enter a news title.");
        }

        //description
        if (string.IsNullOrEmpty(newsDescription))
        {
            newsError.Description = string.Empty;
            ModelState.AddModelError("newsDescription", "You must enter a news description.");
        }

        //beginningDate
        if (string.IsNullOrEmpty(newsBeginningDate))
        {
            ModelState.AddModelError("newsBeginningDate", "You must enter a beginning date.");
        }

        //endingDate
        if (string.IsNullOrEmpty(newsEndingDate))
        {
            ModelState.AddModelError("newsEndingDate", "You must enter an ending date.");
        }

        //set the beginning date
        try
        {
            dtBeginningDate = DateTime.Parse(newsBeginningDate);
            newsError.BeginningDate = dtBeginningDate;
        }

        catch (FormatException)
        {
            ModelState.AddModelError("newsBeginningDate", strInvalidDateError);
        }

        //set the ending date
        try
        {
            dtEndingDate = DateTime.Parse(newsEndingDate);
            newsError.EndingDate = dtEndingDate;
        }

        catch (FormatException)
        {
            ModelState.AddModelError("newsEndingDate", strInvalidDateError);
        }

        //data is validated, so we can begin the update
        if (ModelState.IsValid == true)
        {

            try
            {
                //use to perform actions on db
                Models.NewsDataContext dcNews = new Models.NewsDataContext();

                //fetch the items that match what the user requested to edit
                lstNewsItem = this.GetNewsItem(newsID);

                //set news properties
                foreach (Models.News news in lstNewsItem)
                {

                    news.UserId = (Guid)member.ProviderUserKey;
                    news.Title = newsTitle;
                    news.Description = newsDescription;
                    news.EntryDate = DateTime.Now;
                    news.BeginningDate = dtBeginningDate;
                    news.EndingDate = dtEndingDate;

                }//next

                //update the transaction
                dcNews.SubmitChanges();

                //update the news list
                return PartialView("NewsList", this.GetNewsItems());

            }

            //just to make sure everything goes as planned,
            // catch any unhandled exceptions
            catch (Exception ex)
            {
                ModelState.AddModelError("_FORM", ex);
            }//end catch

        }//end if valid modelstate


        //invalid modelstate, so repopulate the viewdata and
        //send it back

        //the list to hold the entries
        List<Models.News> lstErrorNewsItems = new List<Models.News>();

        //set the remaining error properties
        newsError.UserId = (Guid)member.ProviderUserKey;
        newsError.NewsID = newsID;
        newsError.EntryDate = DateTime.Now;

        //add the item--there will only be one
        //but the view is expecting a list so we will
        //treat it like one
        lstErrorNewsItems.Add(newsError);

        return PartialView("EditNews", lstErrorNewsItems);

    }//end actionresult

的问题是，当一个的ModelState错误时，不返回的ModelState可视数据。我怀疑这是可能的，因为我没有指定一个更新的目标ID。但我不能设置其他updatetargetid，因为我已经有一个。任何想法？

The problem is that when a modelstate error occurs, the modelstate viewdata isn't returned. I suspect it's possibly because I'm not specifying an update target id. But I can't set another updatetargetid because I already have one. Any ideas?

推荐答案

好吧，我理解了它。感谢您的答复。对于未来的参考，我所要做的就是设置一个主控除法，我所有的内容进入。然后，我始终将updateTargetID到分，这样也无所谓它显示什么内容，只是它显示。这实际上证明是比较容易，因为你没有浪费的Javascript功能设置和关闭，因为你只使用一个不断更新的其他div标签。

Alright, I've figured it out. Thanks for the response. For future reference, what I had to do was set up one master divider that all of my content goes into. Then, I always set the updateTargetID to that divider so that it doesn't matter what content it displays, just that it displays it. This actually turns out to be easier because you don't have to waste Javascript functions setting other div tags on and off because you're only using one that is continuously updated.

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