I've been scouring the web for a way to do this.
I want to generate a hyperlink to an action from my controller and put it in a string. I need to be able to define the label and give it html attributes. I can get Url.Action(...) working but that method doesn't let me define the label on the link.
HtmlHelper.GenerateLink(...) looks promising but I can't find any concrete examples on how to use it.
The link should look something like this:
View
Add this property to your base controller:
protected HtmlHelper Html
{
get
{
var viewContext = new ViewContext( ControllerContext, new WebFormView( Request.CurrentExecutionFilePath ),
new ViewDataDictionary(), new TempDataDictionary(), Response.Output )
{
RouteData = ControllerContext.RouteData
};
return new HtmlHelper( viewContext, new ViewPage() );
}
}
and then call it from anywhere:
var link = Html.ActionLink( "Click Me", "action" );
try this
string str = string.Concat("View"
and then pass this in ViewData and call it in view
<%= str%>
there are a few ways to do this - here are 2:
Link name here
Html.ActionLink(article.Title,
"Login", // <-- Controller Name.
"Item", // <-- ActionMethod
new { id = "<arguments here" }, // <-- Route arguments.
null // <-- htmlArguments .. which are none. You need this value
// otherwise you call the WRONG method ...
// (refer to comments, below).
)
there are other overloads of each available
Perhaps a little more information on why you would want to do this would be a little more helpful. If you return a string that contains HTML it will by default be HTML encoded and rendered useless on the client. If you have a custom view where this will be rendered why not build the link there using #Html.ActionLink?
I guess I am trying to figure out the benefit of doing it in the controller rather than the view...
Related
as I can make this code dynamically
public ActionResult EditingUpdate()
{
//...
string fName = GridViewExtension.GetEditValue<string>("FirstName");
string lName = GridViewExtension.GetEditValue<string>("LastName");
//...
}
There are several ways of doing this, it depends on how you want to present the action to the user. I would recommend you follow the example on the DevExpress Demo Page. They show you how to pass the model into your controller.
Controller:
public ActionResult EditingUpdate(MyObject model)
{
string fName = model.FirstName;
....
....
{
Now, the following step is where you have few choices. You can call the controller method in several different ways, all from the gridview partial view. Again, refer to the DevExpress Demo Page. If you want to call the method from an edit action (which is what I assume based on your method name), then you use:
settings.SettingsEditing.UpdateRowRouteValues = new { Controller = "MyController", Action = "EditingUpdate" };
But there are other ways of calling this method, such as
settings.CustomActionRouteValues = new { Controller = "MyController", Action = "EditingUpdate" };
It all depends when you want the gridview to call this method.
Follow the example in the demo, that will help you decide how you want it. Good luck!
I have an MVC app where users fill in a 4-step form then go to a "confirm" screen. On the confirm screen, if they select to modify their info I use RedirectToAction to take them back to the first step view, and I pass a URL parameter "modify=true", which tells the controller to use the session object already created as opposed to creating a new object from the DB and displaying an empty form. But once they submit the form for step 1 I want to send them from my controller to the step 2 view along with the "modify=true" parameter. There doesn't seem to be a way to return a viewmodel to a view and also pass a query string parameter. How can I accomplish this?
I have considered adding a bool to the viewmodels to signify "inReview" but i use different viewmodels for each of these views and they're all pretty clean, it seems like this bool would muck things up a bit.
I have also considered adding the bool to viewbag or viewdata, but then i'd be using the submit button to pass that value and the "modify=true" parameter would drop off the URL, possibly confusing the user and definitely confusing the code.
Thanks
If you use the Html.BeginForm() helper (without parameters) it will automatically append existing query string parameters to the generated form action attribute. If you use some of the other overloads such as Html.BeginForm("SomeAction", "SomeController", FormMethod.Post) then you're gonna lose those parameters. This could be easily fixed by writing a custom helper that will take into account those parameters:
public static class HtmlHelpers
{
public static IDisposable BeginRequestForm(this HtmlHelper html, string action, string controller, FormMethod method)
{
var builder = new TagBuilder("form");
var urlHelper = new UrlHelper(html.ViewContext.RequestContext);
var routeValues = new RouteValueDictionary();
var query = html.ViewContext.HttpContext.Request.QueryString;
foreach (string key in query)
{
routeValues[key] = query[key];
}
builder.MergeAttribute("action", urlHelper.Action(action, controller, routeValues));
builder.MergeAttribute("method", HtmlHelper.GetFormMethodString(method), true);
html.ViewContext.Writer.Write(builder.ToString(TagRenderMode.StartTag));
return new MvcForm(html.ViewContext);
}
}
and then use in your view (after bringing it into scope of course):
#using (Html.BeginRequestForm("SomeAction", "SomeController", FormMethod.Post))
{
...
}
You can either use ViewBag or your view model. You just need to pass the value somehow to the view:
ViewBag.modify = true;
return View(model);
Then in your view:
Html.BeginForm("MyAction", "MyController", new { modify = ViewBag.modify })
I am trying to submit to a controller action method by using Html.ActionLink in my view. I am doing this as non-ajax submit because the return type of my action is FileContentResult (thanks to #Darin for this info). However, my action link is not posting my view to Action Method. Below is my code
View's Code (Partial view)
#Html.ActionLink("Save", "SaveFile", "ui", new { htmlResult="asdf"})
Here, UI is controller name, SaveFile is method name.
Controller method
public FileContentResult SaveFile(string htmlString)
{
...
...
pdfBytes = pdfConverter.GetPdfBytesFromHtmlString(html);
var cd = new ContentDisposition
{
FileName = "MyFile.pdf",
Inline = false
};
Response.AddHeader("Content-Disposition", cd.ToString());
return File(pdfBytes, "application/pdf");
}
When I hit the same URL from browser address bar, then it is hit and also returns the pdf file with no issues. Same this is not happening through action link. I also tried putting the action link inside #using Html.BeginForm().... but no use.
Can you please tell me where I might be doing wrong here?
Thanks!
Html.ActionLink has a lots of overloads and it's very easy to use the wrong one. You are currently using the (String, String, Object, Object) overload which treats your third argument "ui" this route values which leads to a wrongly generated link.
Use this overload instead:
#Html.ActionLink("Save", //Link text
"SaveFile", // Action Name
"ui", // Controller name
new { htmlResult="asdf"}, //Route values
null /* html attributes */)
I am creating a modular ASP.NET MVC application using areas. In short, I have created a greedy route that captures all routes beginning with {application}/{*catchAll}.
Here is the action:
// get /application/index
public ActionResult Index(string application, object catchAll)
{
// forward to partial request to return partial view
ViewData["partialRequest"] = new PartialRequest(catchAll);
// this gets called in the view page and uses a partial request class to return a partial view
}
Example:
The Url "/Application/Accounts/LogOn" will then cause the Index action to pass "/Accounts/LogOn" into the PartialRequest, but as a string value.
// partial request constructor
public PartialRequest(object routeValues)
{
RouteValueDictionary = new RouteValueDictionary(routeValues);
}
In this case, the route value dictionary will not return any values for the routeData, whereas if I specify a route in the Index Action:
ViewData["partialRequest"] = new PartialRequest(new { controller = "accounts", action = "logon" });
It works, and the routeData values contains a "controller" key and an "action" key; whereas before, the keys are empty, and therefore the rest of the class wont work.
So my question is, how can I convert the "/Accounts/LogOn" in the catchAll to "new { controller = "accounts", action = "logon" }"??
If this is not clear, I will explain more! :)
Matt
This is the "closest" I have got, but it obviously wont work for complex routes:
// split values into array
var routeParts = catchAll.ToString().Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
// feels like a hack
catchAll = new
{
controller = routeParts[0],
action = routeParts[1]
};
You need to know what part is what in the catchAll parameter. Then you need to parse it yourself (like you are doing in your example or use a regexp). There is no way for the framework to know what part is the controller name and what is the action name and so on, as you haven't specified that in your route.
Why do you want to do something like this? There is probably a better way.
I want to render the same view after a successful action (rather than use RedirectToAction), but I need to modify the model data that is rendered to that view. The following is a contrived example that demonstrates two methods that that do not work:
[AcceptVerbs("POST")]
public ActionResult EditProduct(int id, [Bind(Include="UnitPrice, ProductName")]Product product) {
NORTHWNDEntities entities = new NORTHWNDEntities();
if (ModelState.IsValid) {
var dbProduct = entities.ProductSet.First(p => p.ProductID == id);
dbProduct.ProductName = product.ProductName;
dbProduct.UnitPrice = product.UnitPrice;
entities.SaveChanges();
}
/* Neither of these work */
product.ProductName = "This has no effect";
ViewData["ProductName"] = "This has no effect either";
return View(product);
}
Does anyone know what the correct method is for accomplishing this?
After researching this further, I have an explanation why the following code has no effect in the Action:
product.ProductName = "This has no effect";
ViewData["ProductName"] = "This has no effect either";
My View uses HTML Helpers:
<% Html.EditorFor(x => x.ProductName);
HTML Helpers uses the following order precedence when attempting lookup of the key:
ViewData.ModelState dictionary entry
Model property (if a strongly typed view. This property is a shortcut to View.ViewData.Model)
ViewData dictionary entry
For HTTP Post Actions, ModelState is always populated, so modifying the Model (product.ProductName) or ViewData directly (ViewData["ProductName"]) has no effect.
If you do need to modify ModelState directly, the syntax to do so is:
ModelState.SetModelValue("ProductName", new ValueProviderResult("Your new value", "", CultureInfo.InvariantCulture));
Or, to clear the ModelState value:
ModelState.SetModelValue("ProductName", null);
You can create an extension method to simplify the syntax:
public static class ModelStateDictionaryExtensions {
public static void SetModelValue(this ModelStateDictionary modelState, string key, object rawValue) {
modelState.SetModelValue(key, new ValueProviderResult(rawValue, String.Empty, CultureInfo.InvariantCulture));
}
}
Then you can simply write:
ModelState.SetModelValue("ProductName", "Your new value");
For more details, see Consumption of Data in MVC2 Views.
The values are stored in ModelState.
This should do what you want:
ModelState.SetModelValue("ProductName", "The new value");
I wouldn't suggest doing that though... the correct method would be to follow the PRG (Post/Redirect/Get) pattern.
HTHs,
Charles
EDIT: Updated to reflect the better was of setting the ModelState value as found by #Gary
This will trigger the model to re-evaluate under simple conditions:
ModelState.Clear();
model.Property = "new value";
TryValidateModel(model);
Perform ModelState.Clear() before you change the model.
...
ModelState.Clear()
dbProduct.ProductName = product.ProductName;
dbProduct.UnitPrice = product.UnitPrice;
...