C# - Adding Own HtmlHelper In MVC 3
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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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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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 11, 2011
I am having some trouble with returning a View in response to an ActionResult method being invoked. In my view I have a ViewData which holds a value which is being read. Current process.. user selects 1 of three radio buttons, and clicks a button to apply the selection, which in turn triggers method which sets the form ..
this.form =
this.htmlHelper.BeginForm("GridEditingMode",
"Classification")
Now in my controller, I change the value in the ViewData and simply which to return to the View();. Here is we're the fun starts.. I receive the following message, and cannot get around it. The view 'GridEditingMode' or its master was not found. The following locations were searched:
[Code]....
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Aug 16, 2010
am currently stuck with this problem of displaying an image using HtmlHelper class.Here is what i have.
I have a custom HtmlHelper class which supposed to display an image:
[Code]....
[Code]....
I managed to get to the controller, but image shows as null. Is there a way around it ? or maybe an even better way to do this?
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Mar 2, 2011
i have a class ProductCategoryViewModel
public class ProductCategoryViewModel{
public List<Category> Category { get; set; }
}
List<Category> Category is my database table having two properties Category_Id and Category_Name
and a strongly typed ProductCategoryViewModel View in which a ListBoxFor HtmlHelper is filled with Category_Name and Category_Id
public ActionResult Index(ProductCategoryViewModel model)
{
if (ModelState.IsValid)[code]....
In this Article is also my Database table defined in Linq to Sql classes. I want to get selected value and text from HtmlHelper ListBox to insert it to my Article table
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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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Aug 24, 2010
I'm trying to override all the Html.TextBoxFor etc. methods. I want to make them non-static methods in a class that extends ViewUserControl. But, according to intellisense, Html does have access to these methods; they simply don't appear. So basically I want to do something like:
[Code]....
But I'm not getting the syntax right.
Basically just trying to wrap the TextBoxFor call so that my ViewUserControl can drop in a unique id each time.
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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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Nov 26, 2010
I'm trying to create a jquery template using the HtmlHelper.ActionLink. By default it url encodes the parameters, which causes a problem for the syntax needed for the template. Is there a way to override the encoding.
In this example
<script id="itemTemplate" type="text/x-jquery-tmpl">
@Html.ActionLink("Details", "Details", new { id = "${ID}" } ) | ${Last} | ${First} <br />
</script>
the generated code for @Html.ActionLink ends up being
<a href="/User/Details/%24%7BID%7D">Details</a>
What I'd like to end up with is
<a href="/User/Details/${ID}">Details</a>
<script id="itemTemplate"
type="tex
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Jun 29, 2010
When upgrading to mvc2 i noticed some of my javascript that was keying on "Points[0]_Id" (this is invalid for an html id btw) started to fail. I pulled up the source and noticed that the TagBuilder class now generates valid client id's and replaces all invalid characters with the "IdAttributeDotReplacement" (which is a terrible name now, since it's not just a dot replacement character anymore). I started to look for a way to generate client id's using a helper built into mvc and came across HtmlHelper.GenerateIdFromName, but this still generates ids the invalid way!
TagBuilder.GenerateId( "Points[0].Id" ) = "Points_0__Id"
HtmlHelper.GenerateFromName( "Points[0].Id" ) = "Points[0]_Id"
IMO: the tagbuilder class or the GenerateFromName code should not be duplicated in two different spots or else you will get errors like this. Also I consider this change made to TagBuilder.GenerateId to be a breaking change and should be included in the breaking changes section of the release notes.
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Sep 23, 2010
I have an HTML Helper that essentially renders static content read from HTML files (inside of a vdir). There are cases when the HTML file has a title element defined and in such cases, the current page should use the given title. The content inside of the body should be rendered where the Helper class is referenced in the View.
This is how I call the helper.
<%=Html.StaticContent("staticcontent.htm",
new List<StaticContentTag>()
{
new StaticContentTag()
{TagKey=ReplaceTags.MarketName,
TagValue = "Austin"}
}, Model, true) %>
I'm passing in the ViewModel so that I can set the title and the last parameter is a flag that says whether to force the title or not.
The head has the title defined like this.
<title><%=Model.Title%></title>
I know what I'm doing wrong here by referencing the Model.Title element before even calling the helper. Any ideas on how I can work around this?
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Feb 16, 2010
What are the advantages of extending HtmlHelper instead of creating a Custom Class.
f.e. <%= Html.Table(data) %> vs <%= CustomClass.Table(data) %>
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Feb 10, 2011
I have the following code:
public static PartialViewResult DateTime(this HtmlHelper helper)
{
return System.DateTime.Now.ToLongTimeString();
}
and now I want to return a Partial view from inside the DateTime method. But helper instance does not have any method for partial view.
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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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Aug 30, 2010
I am building a simple CMS with asp.net MVC and I have almost all the parts working. I have one minor issue which I can't work out how to solve. I have a Html helper method that renders the content of area. This method however uses the Response.Write to write its content rather than returning a string. The reason for this is that I'm performing a partial request and hence do not have a string to return.
My template body looks like this:
<body>
<h1>Default Template</h1>
<% Html.ContentArea("Main"); %>
</body>
The problem I'm having is that the content renders above the H1 tag. My understand was that the h1 should already be in the response and my call to response.Write() would therefore append content after that point. This is obviously not happening. What am I missing here.
I've used partial requests before and they always render in the correct place. I haven't yet used them with MVC 2, this could possibly be the problem.
Below is the content area extension method. The widget render method varies and is where the partial request occurs. However even the start and end container tag render above h1 so it has to be something fundamental I'm doing wrong.
public static void ContentArea(this HtmlHelper htmlHelper, string areaName)
{
var container = new TagBuilder("div");
container.GenerateId(areaName);
container.AddCssClass("content-area");
[Code]....
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Jun 10, 2010
Is it possible to instantiate an HtmlHelper object in a controller action in order to call HtmlHelper.EditorFor?
I would like to call HtmlHelper.EditorFor to return some partial html generated by an editor template in response to an ajax call. If I can do so I would not need to create an ascx file that otherwise would do the call to EditorFor.
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Nov 2, 2010
I have an action similar to
[Code]....
When no date parameter is submitted (i.e. date == null), date is set to DateTime.Now in the controller action and everything works like a charm, that is TextBox will use the value provided in the model. However, if date is passed in the URL (thus bound to date in the call to the index action) TextBox will NOT use the model value (which is properly parsed into a DateTime at that point) but instead use the value from ViewData.ModelState. It doesn't matter what value is set in the call to TextBox, it will be ignored completely.
The only way around this behaviour is to call
[Code]....
in the controller action.
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Jun 12, 2010
When you render one of the "built in" html helpers (say "TextBoxFor") with ":" (so it's encoded) it renders fine.However if I render the following (a custom file input helper) with ":", the markup are displayed.I understand why. Just don't know how to prevent this (no, I want to stay with ":" and not use "=")(I looked at the source code for the built in ones, but can't see what I'm missing: ttp://aspnet.codeplex.com/SourceControl/changeset/view/23011#288010 )
[Code]....
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