MVC :: Extend The HtmlHelper By Using Metadata / Access Metadata In HtmlHelper Extension Method?
Jan 9, 2010
I would like to extend the HtmlHelper by using metadata (similar to DataAnnotaions metadata). Specifically I want to be able to add a 'Title' attribute to html controls that will then appear as a tooltip on the control. I would like to keep the tooltip text with my model, for example by adding 'Tiltle' metadata to the model as follows:
[DisplayName("User Id")]
[Title("Enter your 10 digit user id")]
property UserId { get; set; }
So the questions are:
1. How do I add metadata (such as 'Title') to my model?
2. How do I access this metadata in my HtmlHelper extension method?
[code]....
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Jan 18, 2011
I would like to know what the pros and cons are of creating an extension method v a partial view. From my understanding, htmlHelper extension methods are better as they enable one to unit test the view.
e.g. Assert.AreEqual(Html.Price(), "<td><tr><td>Price</td><td>4.50</td></tr>");
where the Price() method contains the presentation logic.
Since both the extension method and partial view are reusable, what then is the point / benefit of a partial view?
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Jun 8, 2010
i have defined a dropdown list in the controller
[Code]....
then i can show this dropdownlist in my "about" view <%=Html.DropDownList("a") %>.
BUT, now i want to define this dropdown list at my back end. what i want to do is to create a new "Helper".cs file in my project, and create a function within it. so every time if i want to show this dropdown list, i can just simply call this function instead of Add new SelectListItems one by one. is there anyone tell me how to do it?? and is it a good way to create a dropdownlist at the back end?
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Mar 26, 2010
I can extend the HtmlHelper class from a View page but how can I extend its functionality within a class?
[code]...
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Mar 9, 2011
I have created a custom html helper as follow:
[Code]....
In my View, I am using it like this:
[Code]....
However, for some reason nothing gets rendered!
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Jul 6, 2010
I saw this implemented somewhere but basically below I'm using the textbox HTMLHelper to draw a textbox with the id myID and default text 'text_goes_here'. I want to also add a class to thiis helper, i saw somewhere it implemented with new {@class =''} as a third parameter creating an object but im not sure exactly how its wrote
<%= Html.TextBox("myID", "text_goes_here") %>
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Apr 23, 2010
Ok I have this object.ascx. Everythings works fine in an Add scenario (model is null). However when the model isn't null I have metadata for the property in object.ascx then when I call Html.Editor(prop.PropertyName) I have a default instance of modelmetadata within that template. About the only value that is preserved is propertyname. My AdditionalValues are gone, IsRequired, Watermark etc all have default values. I'm seeing bizarro state driven behaviour like this all over the place when it comes to templates. It is peeving me.
[Code]....
So my question is: Why does having a non-null model cause a completely unexpected (and stupid) behaviour? I find it hard to believe this is intended.
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Oct 29, 2010
I am trying to convert some repetitive html into a user control. Here is the HTML :
[Code]....
And here is where I am slotting it in to my original HTML :
[Code]....
I need to do this dynamically, is there any way around this?
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Dec 7, 2010
I was wondering if anyone can point me in the right direction? I have a POCO model and I am using Code First CTP. In my application, I set the database to be recreated whenever the model changes.
I would like to write custom functionality to access the model (POCO) metadata same way as EF sees it and use that to generate some source files (using T4). I would like to access the processed model not having to worry about finding properties that hold primary keys or any other conventions (implicit or not). What is the way to go about it?
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Mar 18, 2011
I have a view that is strongly typed and its model is of type LogOnModel. That LogOnModel has anotated properties like this one:
[Required(ErrorMessage = "Please enter your password")]
[DataType(DataType.Password)]
[Display(Name = "Password", Description = "Your secreet password")]
public string Password { get; set; }
All of them has Display anotation with Display.Descripion property set. I want to create HtmlHelper extension method that will output <span> containg the value of Display.Description property. So for example if I called my extension method DescriptionFor than this code:
<%: Html.DescriptionFor(m => m.Password) %>
should produce following html: <span>Your secreet password</span>
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Sep 28, 2010
I am trying to extend controller with extension method which redirects to 404 page.
[Code]....
However, controller.View() method is internal and can't be called outside class methods.
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Jan 25, 2010
n an online document management system, I need to get the metadata of uploaded documents (author, title, comments). The documents may be different types(word, pdf, txt...).
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Feb 19, 2011
I am new to MVC and I am trying to create my own extension method so that I can add onto the html helpers that are available in my razor views. Html.DropDownListFor() lets you create a drop down list for any propery on your model. I would like to create a helper called Html.StateDropDownListFor() that does the exact same thing, except loads the drop down with all 50 US states. This way I don't have to create a SelectList for every single state drop down that I create. What is the easiest way to do this? Right now I have this:
[code]....
Am I even close? I don't want to rebuild a whole text box helper, I just want to create a helper that utilizes the existing text box helper but does the SelectList for me. That way in my views I could just do Html.StateDropDownList(x => x.State)
[code]....
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Sep 20, 2010
How can I call HtmlHelper methods outside of a view? I want to call Html.ActionLink from a C# method. Then use Response.Write to write the output from ActionLink to the output stream of a view. Is there a server side equivalent of HtmlHelper.ActionLink?
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Mar 25, 2010
i have a very big problem: i've created a new test html helper:
[Code]....
i can call it but the first param that i need to pass is htmlHelper and not text as i should do. Why?
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Jan 3, 2010
I am trying to debug a problem where HtmlHelper is null in extension methods. Oddly the debugger claims it's fully populated, however I consistently get null exceptions. I'm trying to figure out where HtmlHelper should being instantiated in an attempt to see where my problem may be.
Where should HtmlHelper be Instantiated?
Update: In particular I am trying to implement the extension found here, [URL] within a masterpage. The error occurs on the MVC template's HomeController.Index(). There are some 'plugins'/virtualpathing that may be causing the problem (trying to avoid this can of worms), but, code the code is essentially the same as found here: [URL]. However, I don't want to trouble anyone with the details of all of that.
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Jul 23, 2010
I am on the way to manpulate existing generice GRID creation, i am stuck as it was using [Code]....
to create action links. I am missing this reference in MVC 2 framework.
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Aug 24, 2010
I am developing a Web app that is based on ASP.NET 3.5, and i added some page from ASP.NET MVC, everything is ok, until i use the "HTML" helper class, then the page is not being able be render, because this is not recognized.
For Example : Html.BeginForm() => this is not recognize as a method
But if i used "System.Web.Mvc.Html.FormExtensions.BeginForm", which is a extension method itself, it work fine.
Environment : ASP.NET MVC 2 and ASP.NET 3.5
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Nov 24, 2010
My View inherits Models.MyModel
<%@ Page Language="C#" MasterPageFile="Something.Master" Inherits="Models.MyModel>" %>
I need a property Model.Something to be available in a HtmlHelper method when I call it from this view.
<%= Html.CustomHelper(...) %>
Is there any way to access this? Maybe via ViewContext or ViewDataDictionary?
I do not want to explicitly pass Model.SessionKey for each helper I call.
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Jul 1, 2010
I am using VS2010 & MVC2 to develop a web app. I noticed that HtmlHelper.LabelFor doesnt contain an override that accepts either a css class or html attributes. I was thinking about writing my own override for this, but am struggling with it.
The current LabelFor method accepts a lambda expression and automatically extrapolates the property name, display name (if specified via [DisplayName] attribute and value and generates the label. How do I write my overridden to do the same, but also insert any htmlAttributes specified such as class, style etc.
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Feb 3, 2010
I have some datatables in a LinqToSql entity model (edmx) that are structured like this: SalesOpportunity *<-1 User *<-1 Person i.e Many SalesOpportunities / 1 User, Many Users / 1 Person Anyway, My DomainService is SalesOpportunity centric, and I want to serialize info about the person into the metadata class. I can serialize data about the user without any problem like this:
MetaData Class:
<Include("UserName", "UserName")> _
Public User As User
DomainService Class - GetOpportunities()
Return Me.ObjectContext.Opportunities.Include("User")
I've been trying for several hours to get the Person information. If you have any tips, I'd be grateful to hear them.
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Mar 7, 2011
How can I override the way ASP.NET creates a WSDL file for my Web Serive from my WebMethods' metadata?
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May 3, 2010
one of my client have a core requirement to develop a web application which can generate dynamic UI pages with metadata elements and relevant operations for various different products. We are thinking on lines of a approach where UI elements details will be stored in metadata and the application will read the meta data and render the UI pages based on it.
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Aug 18, 2010
i use vs 2010 ultimate. i created a 'asp.net web application' from scratch, right clicked app_data and added a new sql server database (named MyDB), built two tables and saved it, added a 'ado.net entity model' to my project(named EDM_MyDB). then i dragged and dropped a 'list view' and 'entity data source' on my default.aspx. i tried to configure my 'entity data source' instance. in configuration window, underconnection string i tried to choose my entity instance (which i'd created before) but suddenly a popup message came up and said: The metadata specified in the connection string couldn't be loaded. Consider rebuilding the web project to build assemblies that may contain data. The following error(s) occurred: Unable to load the specified metadata resource.here is my whole connection string tab:
[Code]....
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Mar 23, 2010
i need create metadata assembly for a function..
and i dont know how to create the step for creating assembly..
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