ASP.NET MVC Return to Previous Page
- by Jason Enochs
I have a basic Edit method in my controller that redirects back to a top level listing (“Index”) when the edit succeeds. Standard setup after scaffolding.
I am trying to change this Edit method to redirect back to the previous page (not Index). Since my Edit method is not using the default mapped input parameter “id”, I am using that to pass the previous URL.
In my Edit “get” method, I use this line to grab the previous URL and it works fine:
ViewBag.ReturnUrl = Request.UrlReferrer.AbsoluteUri;
I send this return URL to the Edit “post” method by using my form tag like this:
@using (Html.BeginForm(new { id = ViewBag.ReturnUrl }))
Now this is where the wheels fall off. I can't seem to get the URL parsed from the id parameter properly.
UPDATE****
Using Gary's example as a guide, I changing my parameter name from "id" to "returnUrl" and used a hidden field to pass my parameter. Lesson: Only use the id parameter how it was intended to be used...keep it simple. It works now... Here is my updated code.
//
// GET: /Question/Edit/5
public ActionResult Edit(int id)
{
Question question = db.Questions.Find(id);
ViewBag.DomainId = new SelectList(db.Domains, "DomainId", "Name", question.DomainId);
ViewBag.Answers = db.Questions
.AsEnumerable()
.Select(d => new SelectListItem
{
Text = d.Text,
Value = d.QuestionId.ToString(),
Selected = question.QuestionId == d.QuestionId
});
ViewBag.returnUrl = Request.UrlReferrer;
ViewBag.ExamId = db.Domains.Find(question.DomainId).ExamId;
ViewBag.IndexByQuestion = string.Format("IndexByQuestion/{0}", question.QuestionId);
return View(question);
}
//
// POST: /Question/Edit/5
[HttpPost]
public ActionResult Edit(Question question, string returnUrl)
{
int ExamId = db.Domains.Find(question.DomainId).ExamId;
if (ModelState.IsValid)
{
db.Entry(question).State = EntityState.Modified;
db.SaveChanges();
//return RedirectToAction("Index");
return Redirect(returnUrl);
}
ViewBag.DomainId = new SelectList(db.Domains, "DomainId", "Name", question.DomainId);
return View(question);
}
and I changed my form tag to this:
@using (Html.BeginForm())
{
<input type="hidden" name="returnUrl" value="@ViewBag.returnUrl" />
Thanks Gary
