why does this error occur.. The best overloaded method match for 'System.Web.WebPages.WebPageExecutingBase.Write(System.Web.WebPages.HelperResult)' has some invalid arguments...when I am trying to put a partial view in a div like
<div>#Html.RenderPartial("_pagePartial");</div>
thanks for your help.
Because the correct syntax is this (notice the { }s):
<div>#{Html.RenderPartial("_pagePartial");}</div>
or if you prefer:
<div>#Html.Partial("_pagePartial")</div>
The reason for this is that contrary to the Partial extension method RenderPartial doesn't return anything. It directly writes to the output stream. Contrast this with the WebForm equivalents:
<% Html.RenderPartial("_pagePartial"); %>
<%= Html.Partial("_pagePartial") %>
Related
when using
<%= Html.DropDownListFor(model => model.FeeTypeId, Model.GetFeeTypes(), new { })%>
in this case the right option is selected according to Model.FeeTypeId when the select is rendered.
BUT
if you render the form using a partial view, passing it a specific HtmlFieldPrefix (you will need it if,for example, you want to render two identical views and want different ids the elements)
<% Html.RenderPartial("path-to-partial-view", Model, new ViewDataDictionary() { TemplateInfo = new TemplateInfo() { HtmlFieldPrefix = "myPrefix" } }); %>
then the value will not be selected.
looks similar to the problem at DropDownListFor in EditorTemplate not selecting value but from different cause.
looked in the MVC 3 source and seems like the problem is at the SelectInternal method
it uses the htmlHelper.ViewData.Eval(fullName);
which fails to get the value by the full name when it contains the prefix,
TextBoxFor doesn't fail as it passes the value of the expression to InputHelper so it doesn't get to use the ViewData.Eval
just to be sure tested it at the partial view:
in the partial view the following will print "myPrefix.FeeTypeId"
<%= Html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName("FeeTypeId") %>
and the following will print "by property name: [value] by full name: [empty string]"
<%="by property name: " + Html.ViewData.Eval("FeeTypeId")%><br />
<%= "by full name: " + Html.ViewData.Eval(Html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName("FeeTypeId"))%>
The only solution i found is to generate a List at Model.GetFeeTypes() and mark the option i want as selected:
<%= Html.DropDownListFor(model => model.FeeTypeId, Model.GetFeeTypes(Model.FeeTypeId), new { })%>
don't really like this solution + i know i can create the List in the partial view which is also ugly,
is there another solution to this?
I have discovered that this is a bug in MVC. It's not fixed, though there is a work around.
See my question answered by myself (I had the same problem before finding your post).
MVC4 binding drop down list in a list (bug)
Regards
Craig
I found a number of questions and answers regarding updating a partial using Ajax after submitting a form. But my question is ?simpler?, I just want to reload a partial every few seconds and load in the new data. This really can't be hard at all, and I remember doing something similar in Rails 2.3 but I can't find the answer anywhere.
Basically, I have a show.html.erb rendering a partial like so:
<div id="latest_post">
<%= render :partial=>'info/latest', :object=>#user, :as=>:user %>
</div>
The partial file located at app/views/info/_latest
<% post = user.posts.last %>
<h1>Last Post</h1>
<p><%= post.content %></p>
I just want the latest_post div to be updated every 30 seconds. Please help!
Well it turns out the answer is a little complicated:
Step 1: Use Javascript's setInterval function along with jQuery's $.get() function to load a page, say /users/1/posts/latest.
setInterval(function(){
$.get("/users/1/posts/latest.js", function(data){
$("latest_post").html(data);
},
"html")
}, 30000);
Step 2: Create a latest.js.erb and put it in your app/views/posts folder.
Contents of latest.js.erb:
<%= render partial: 'posts/latest', object: #user.posts.last, as: :post %>
Step 3: Create the above partial with whatever you'd like (if you don't need a partial, you can just write the entire contents of the div in the latest.js.erb file.)
Step 4: Add a latest method to your PostsController, that defines #user, etc. for the latest.js.erb to use.
Step 5: Add get '/latest' to your routes.rb
Hi,
I have a ASP.NET MVC 3 website where I have created a action that returns a partial view. This view have the following :
<%# OutputCache Duration="10000" VaryByParam="none" %>
And to render this from my main view I use this :
<% Html.RenderAction("ImageWall", "Image"); %>
The problem is that it is not caching at all? When setting a breakpoint I can see that the expensive drawing is running everytime?
For this, Use Action Attribute
<OutputCache(Duration:=10000, VaryByParam:="any")>
Function ImageWall() As PartialViewResult
Return PartialView()
End Function
For Vb.Net sample, sorry
I have a ASP.Net MVC 2 partial view like the one below,
FORM 1:
<div id="d1">
<% using (Ajax.BeginForm("ManageSources", "Sources",
saveAjaxOptions))
{ %>
... all this form's html markup goes here
<div id="src_Parameters"></div>
<% } %>
</div>
Form 2
<% using (Ajax.BeginForm("FetchParameters", "Sources",
fetchAjaxOptions))
{ %>
hidden fields to send values to the action method go here
.. button to post this form
<% } %>
Now, in the fetchAjaxOptions, i have given the target div to be src_Parameters, which resides inside the form1, when i post the second form, i am being returned a partial view as the only view page, instead of populating the results in the src_Parameters div.
How do i accomplish this. Actually the results of the FetchParameters ajax call should be able to be posted for the ManageSources ajax call.
Where is the problem or will nesting the forms workout since this is using ajax forms.. Kindly suggest me the right procedure to do this task.
You haven't posted your server side code, but I suspect you have forgotten to have set the return type to be a partial view.
public PartialViewResult FetchParameters()
{
//do some stuff
return PartialView(“_ViewName”, viewModel)
}
It could also be that you fotgot to add a reference to the Microsoft Ajax
<script src="../../Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
If I use the following Controller method:
public ActionResult Menu()
{
// do stuff...
return PartialView("viewName", navLinks);
}
calling the partial view in _Layout.cshtml like this:
<div id="categories">
#{ Html.Action("Menu", "Nav"); }
</div>
With the following ASCX partial view:
<%# Control Language="C#"
Inherits="ViewUserController<IEnumerable<MyDataType>>" %>
<% foreach(var link in Model) { %>
<%: Html.Route.Link(link.Text, link.RouteValues) %>
<% } %>
everything works fine. Yay.
BUT, if I use either of the following RAZOR partial views:
#model IEnumerable<MyDataType>
#foreach(var link in Model){
Html.RouteLink(link.Text, link.RouteValues);
}
or...
#model IEnumerable<MyDataType>
#{
Layout = null;
}
#foreach(var link in Model){
Html.RouteLink(link.Text, link.RouteValues);
}
I get nothing. there's no exception thrown, I just don't get anything rendered. I know the problem isn't with the controller method (it works just great with the ASCX partial view).
What's going on here?
Try changing this:
#foreach(var link in Model){
Html.RouteLink(link.Text, link.RouteValues);
}
to this:
#foreach(var link in Model){
#Html.RouteLink(link.Text, link.RouteValues);
}
It looks like without the # the method is being called, but the return value is just being dscarded. Putting the # causes it to be written in the response.
The RenderAction method writes the action directly to the view and returns void.
The Action method returns the action's contents but doesn't write anything to the view.
Writing #something will print the value of something to the page.
You cannot write #Html.RenderAction, since RenderAction doesn't return anything.
Writing Html.Action(...) (without #) calls the method normally, but doesn't do anything with its return value.
OK, Changing the way the it was called from _Layout.cshtml worked...
<div id="categories">
#Html.Action("Menu", "Nav");
</div>
It is important to note, that #Html.RenderAction DOES NOT work for me. I'd really love some explanation here, because right now, learning Razor is frustrating me as there is little documentation, and problems like these which should take minutes to resolve, are eating up way too much of my time.