Returning both Partial View and a Message

I have a partialview where it's possible to change a Connection String. When submitting an Edit action is called. From here I want to either return and re-open the partial view if I want the user to have a second go. If everything went well (or crashing) I want to call my JavaScript function Logout , that logs the user out and redirect to some startpage.

Both solutions works, just not together. I'm clearly missing some best practice, what should I do?

Partial View: EditSetting

@model WebConsole.ViewModels.Setting.SettingViewModel

@using (Ajax.BeginForm("Edit", "Setting", new AjaxOptions { UpdateTargetId = "div" }, new { id = "editform" }))
{
    <fieldset>
        @Html.AntiForgeryToken()

        <div class="form-horizontal">
            @Html.ValidationSummary(true, "", new {@class = "text-danger"})

            <div class="form-group">
                @Html.LabelFor(model => model.User, htmlAttributes: new {@class = "control-label col-md-2"})
                <div class="col-md-10">
                    @Html.EditorFor(model => model.User, new {htmlAttributes = new {@class = "form-control"}})
                    @Html.ValidationMessageFor(model => model.User, "", new {@class = "text-danger"})
                </div>
            </div>

            <div class="form-group">
                @Html.LabelFor(model => model.Password, htmlAttributes: new {@class = "control-label col-md-2"})
                <div class="col-md-10">
                    <input type="password" name="Password" id="Password" value=""/>
                    @Html.ValidationMessageFor(model => model.Password, "", new {@class = "text-danger"})
                </div>
            </div>

            <div class="form-group">
                @Html.LabelFor(model => model.DataSource, htmlAttributes: new {@class = "control-label col-md-2"})
                <div class="col-md-10">
                    @Html.EditorFor(model => model.DataSource, new {htmlAttributes = new {@class = "form-control"}})
                    @Html.ValidationMessageFor(model => model.DataSource, "", new {@class = "text-danger"})
                </div>
            </div>

            <div class="form-group">
                @Html.LabelFor(model => model.InitialCatalog, htmlAttributes: new {@class = "control-label col-md-2"})
                <div class="col-md-10">
                    @Html.EditorFor(model => model.InitialCatalog, new {htmlAttributes = new {@class = "form-control"}})
                    @Html.ValidationMessageFor(model => model.InitialCatalog, "", new {@class = "text-danger"})
                </div>
            </div>
        </div>
    </fieldset>
}

JavaScript: Submit

$('form').submit(function () {
    var $self = $(this);

    if ($(this).valid()) {

        // Change Connection String
        $.ajax({
            url: this.action,
            type: this.method,
            data: $(this).serialize(),
            success: function (message) {

                // Use Partial View
                //$('#myModal .modal-body').html(message);

                // Conn Str is now changed. Log out and redirect
                logOut($self, message);
            },
            error: function (message) {
                logOut($self, message);
            }
        });
    }
    return false;
});

Action: Edit

[HttpPost]
public ActionResult Edit(SettingViewModel model)
{
    // Validate inputs
    if (!ModelState.IsValid)
    {
        ModelState.AddModelError("", @"Not all inputs are valid.");
        return PartialView("EditSetting", model);
    }

    var sql = new DAL.SQL(DAL.SQL.GenerateConnectionString(model.DataSource, model.InitialCatalog, model.User, SecurePassword(model.Password)));

    // Validate Connection String
    if (!sql.Open())
    {
        ModelState.AddModelError("", @"Error. Unable to open connection to Database.");
        return PartialView("EditSetting", model);
    }

    // Validate a transaction
    if (!sql.IsRunningTransact())
    {
        ModelState.AddModelError("", @"Error. Unable to connect to Database Server.");
        return PartialView("EditSetting", model);
    }

    // Save Connection String
    BuildAndEncryptConnString(model);

    return Content("The Connection String is changed. Log in again to continue.");
}

---

Using the extension method RenderToString and basead on cacois answer, you can create your action like this:

public ActionResult Edit(SettingViewModel model)
{
    // "Ifs" to return only partials
    if (ModelState.IsValid)
    {
        return PartialView("EditSetting", model);
    }

    ...

    // Returning a Json with status (success, error, etc), message, and the content of 
    // your ajax, in your case will be a PartialView in string
    return Json(new { 
               Status = 1, 
               Message = "error message", 
               AjaxReturn = PartialView("EditSetting", model).RenderToString()});
}

Ps. I suggest you to create a model to define the Ajax return, with Status , Message and AjaxReturn . With that, your ajax requests will always return the same object type. For the Status property you can create a Enum.

Your ajax request, will be like this:

$.ajax({
    url: this.action,
    type: this.method,
    data: $(this).serialize(),
    success: function (data) {
        if(data.Message == undefined) {
            // Use data like a partial
        } else {
            // Use data.Message for the message and data.AjaxReturn for the partial
        }
    },
    error: function (message) {
        logOut($self, message);
    }
});

---

Add error handling to your ViewModel:

bool hasErrors;
string errorMessage;

In your controller, if the data validation is ok, just return the PartialView or return RedirectToAction("Index"); . If not, set hasErros = true; and a custom errorMessage .

In the view, place an error block someone where the user will see it:

@if (Model.hasErrors)
{
   <div>Model.errorMessage</div>
}

By the way, you can do the data validation inside the ViewModel constructor.

---

You can Return the Patial View, and Intialize ViewBag and assign the message to it, then in the view check if have value and show it if true.

Controller:

[HttpPost]
public ActionResult Edit(SettingViewModel model)
{
    // Put the ViewBag where ever you want
    ViewBag.ErrorMsg =" Error";
    return PartialView("EditSetting", model);
}

View:

@if(ViewBag.ErrorMsg !=null )
{
    <div>@ViewBag.ErrorMsg</div>
}

I hope that helped.

链接地址: http://www.djcxy.com/p/42106.html

上一篇: 查询字符串的最大可能长度是多少？

下一篇: 返回部分视图和消息