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Strange situation, Visual Studio debugging ran through action to view but nothing returned to browser

Tag: c#,jquery,ajax,asp.net-mvc,razor

I have encountered a very strange problem. Basically, there is a Delete ActionLink. Once clicked, the code checks the condition, checks true/false, stays on current page or goes to Delete view.

I have posted the solution for this scenario and got some very helpful replies. I worked on it and took it to a situation where I was about to succeed.

Anyway, here are the codes

Index View: AJAX calls the Delete action, returns JSON or EmptyResult. If EmptyResult, then it is a failure as the original ActionLink has been disabled, AJAX will call the error function, which calls another action "Delete2".

<td>
                @Html.ActionLink("Edit", "Edit", new { id = item.CustomerId }, htmlAttributes: new { @class = "mergo-actionlink" }) |
                @Html.ActionLink("Details", "Details", new { id = item.CustomerId }, htmlAttributes: new { @class = "mergo-actionlink" }) |
                @Html.ActionLink("Delete", "Delete", new { id = item.CustomerId }, htmlAttributes: new { @class = "mergo-actionlink-delete", data_value = item.CustomerId })
            </td>
        </tr>
    }

</table>

<script type="text/javascript">
    $('.mergo-actionlink-delete').click(
function () {
    var clickedId = $(this).attr('data-value');
    $.ajax({
        dataType: "json",
        url: '@Url.Action("Delete", "Customers")',
        data: { id: clickedId},
        success: function (data) {
            alert(data.message);
        },
        error: function () {
            alert("EmptyResult returns.");
            debugger;
            $.post('@Url.Action("Delete2", "Customers")', { id: clickedId });
        },
        async: false
    });
    return false;
});
</script>

Controllers:

public ActionResult Delete(Guid? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    Customer customer = db.Customers.Find(id);
    if (customer == null)
    {
        return HttpNotFound();
    }

    if (customer.Orders.ToList().Count() != 0)
    {
        return Json(new { message = "This customer has order(s) attached." }, "text/plain", JsonRequestBehavior.AllowGet);
    }
    return new EmptyResult();
}

public ActionResult Delete2(Guid? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    Customer customer = db.Customers.Find(id);
    if (customer == null)
    {
        return HttpNotFound();
    }
    return View(customer);
}

Delete2.cshtml

@model MergoMVC.Customer

@{
    ViewBag.Title = "Delete";
}

<h2>Delete</h2>

<h3>Are you sure you want to delete this?</h3>
<div>
    <h4>Customer</h4>
    <hr />
    <dl class="dl-horizontal">
        <dt>
            @Html.DisplayNameFor(model => model.UserName)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.UserName)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Password)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Password)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Email)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Email)
        </dd>

    </dl>

    @using (Html.BeginForm()) {
        @Html.AntiForgeryToken()

        <div class="form-actions no-color">
            <input type="submit" value="Delete" class="btn btn-default" /> |
            @Html.ActionLink("Back to List", "Index")
        </div>
    }
</div>

And I do have Delete.cshtml and Delete2.cshtml views for the actions. The symptom is - from debugging, Visual Studio went into Delete2 action, returned the "customer" to Delete2.cshtml view, executed it from head to toe. But the browser stayed still on index page. I think something is wrong with the return false; in the AJAX. I'm new to this, so I need some help. Thanks.

Best How To :

error: function () {
            alert("EmptyResult returns.");
            debugger;
            $.post('@Url.Action("Delete2", "Customers")', { id: clickedId });
        },

Result of a post does not refresh your page, so quick fix is to genrate an anchor with URL to controller action add id parameter and click on it or change window location with controller/action/clicked id.

error: function () {
                alert("EmptyResult returns.");
                debugger;
                var a = document.createElement('a');
                // something like, not sure :)
                var hrefUri = '@Html.ActionLink("Delete2", "Customers"'); 
                a.href = hrefUri + "/" + clickedId;
                a.click();
}

You used page controller as rest api controller, not a bad thing at all but do not mix thing around because maybe someone may work on your code. Usually posting stuff via ajax you expect a JSON result, in a ajax post/get request if you return a view + model you need to update somehow the page.

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