MVC: When To Use Custom HTML Helper Methods Vs Html.RenderAction
Feb 10, 2010
It's a little unclear for me on when to use a custom helper method and when to use RenderAction and also when to simply use ViewData instead. Some of their functions overlap slightly.
For example, if I were to create a Category navigation bar, would I create a new helper method and place that in some partial view? I had initially though of doing this, but I read on some blog to use RenderAction instead.
Assume the list of categories is coming from some data source.
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Feb 17, 2010
im extending the htmlhelper. but it i cannot call the renderaction of it.
using System.Text;
using System.Web.Mvc;
using System.Web.Mvc.Html;
public static class ViewHelpers
{
public static string Text(this HtmlHelper htmlHelper, string name, object value, bool isEditMode)
{
htmlHelper.RenderAction(...) //cannot be called
}
}
how can i call the RenderAction?
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Jan 9, 2010
I am new to MVC. why HTML helper methods are inside asp server tags?
for example <%=Html.Textbox("Textbox1")%>
are they equivalnet to asp.net web form server tags. Like in web forms we have
<asp:TextBox runat="server"></asp:TextBox>
If someone can kindly explain.
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Feb 18, 2010
I have a Microsoft MVC project with an action "Foo" whose view ("Foo.aspx") contains the lines:
<%= Html.ActionLink("mylinktext1", "bar") %>
<%= Html.ActionLink<MyController>(x => x.Bar(), "mylinktext2") %>
When I hit this from a web browser or load it from an AJAX call, it properly returns:
<a href="/bar">mylinktext1</a>
<a href="/Bar">mylinktext2</a>
But when I call the action from another view like this:
<% Html.RenderAction<MyController>(x => x.Foo()); %>
Then the links are rendered without targets.
<a href="">mylinktext1</a>
<a href="">mylinktext2</a>
Why would this be happening, and how do I work around it?
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Feb 23, 2011
I have a custom Html Helper that takes a few parameters and generates some Html. For example:
[Code]....
This would render something like:
[Code]....
I would like to be able to define a Razor Template so the Html Helper renders the Html differenlty:
[Code]....
This would render:
[Code]....
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Apr 12, 2010
Whats the difference between Url.Action and Html.RenderActionLink in asp.net mvc?
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Jan 23, 2010
I was wondering if it is possible to create a custom strongly typed HTML Helper in ASP.NET MVC 2? Creating a regular (read not-strongly-typed) helper is straightforward but i am having difficulty creating strongly typed versions. For example, I would like to create a DatePickerFor html helper...
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Oct 1, 2010
MVC contains a strong typed HTML Helper (HTML.CehckBoxFor()) this takes a bool and returns a bool. To make the URL smaller I am thinking to change the bool values on the model object to byte or somthing like that so the url only contains &Parameter=1.
I have found this snippet :
[Code]....
But I have no clue how to turn this in to a strong typed HTML Helper for checkbox that takes byte instead of bool. Its also important that the model object is set with byte instead of bool.
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Dec 30, 2010
I'm trying to write a controller method that returns an ActionResult.
In this method, i would like to:
1. call an HTML helper method
2. Capture and store the HTML helper's rendered HTML in a string
3. Return the method with the rendered HTML wrapped as a JSON
How do i call the Html Helper method from my controller method? Simply using the static class HtmlHelper does not work.
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Jun 2, 2010
Does anybody know what's the difference between Html.RenderAction and Html.Action?
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Dec 2, 2010
Now I found out how to create custom html helpers
using System;
namespace MvcApplication.Helpers {
public class InputlHelper {
public static string Input(this HtmlHelper helper, string name, string text) {
return String.Format("<input name='{0}'>{1}</input>", name, text);
}
}
}
Now how to turn it into a strongly typed helper method InputFor Like it is in the framework?I don't need the Html.TextBoxFor method, I know it exists. I am just curious in how to implement this behavior myself and used this as a simple example.PS. I was looking in the mvc source code but couldn't find a trace of this mysterious TextBoxFor. I only found TextBox. Am I looking at the wrong code?
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Jul 20, 2010
I think I need to drop in some escape characters, but I'm not quite sure where. Here is the javascript function I'm attempting to call:
function setData(associateValue, reviewDateValue) {
var associate = document.getElementById("Associate");
var reviewDate = document.getElementById("ReviewDate");
associate.value = associateValue;
reviewDate.value = reviewDateValue;
}
Here is the asp .net mvc line where I'm attempting to create a Radio button with a click event that calls the above function and passes data from the model as javascript parameter values.
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('<%=item.Associate%>','<%=item.ReviewDate%>' )" } )%>
The above throws a bunch of compile issues and doesn't work. A call such as the following does call the javascript, but doesn't get the data from the model.
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('item.Associate','item.ReviewDate' )" } )%>
<%= Html.RadioButton("Selected", item.Selected, new { onClick="setData('item.Associate','item.ReviewDate' )" } )%>
<% String functionCall = String.Format("setData('{0}','{1}')", Html.Encode(item.Associate), Html.Encode(item.ReviewDate )) ; %>
<%= Html.RadioButton("Selected", item.Selected, new { onClick=functionCall } )%>
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Aug 30, 2010
<%= Html.RouteLink(">>>", new { page = (Model.PageIndex + 1) },null)%>
Is it possible to set image instead ">>>" and how?
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Jan 5, 2011
Can we set an id attribute as I would for something like a table column via: for an html dropdown list element that is created with a helper such as:
<% for (int i = 0; i < Model.Trx.TransactionHolidayCityCollection.Count; i++)
{%>
<%= i > 0 ? "," : "" %>
<%= DropDownData.HolidayDays().ToList().Find(item => item.Value == Model.Trx.TransactionHolidayCityCollection[i].HolidayCityID.Value.ToString()).Text %>
<%} %>
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Sep 9, 2010
I am working in an environment with many teams who are responsible for specific content on pages. Each team is sharing specific information (common class libraries, and master pages) that each are going deliver different types of content.Is it possible for an MVC application to do something similar to RenderPartial and pass a model to another MVC application Controller/Action to return content?
So the code for this might look like:
(http://www.mydomain.com/Home/Index)
<% Html.RenderAction("ads.mydomain.com", "Home", "Index", AdModel) %>
Maybe this is not a good idea as another thread has to spin up to server a partial view?
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Sep 21, 2010
After rendering a view on a Post, a call to RenderAction inside the view will call for the Post method. Is there any way to specify I want to call the Get method instead of the Post?
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Jun 28, 2010
In my Site.Master View, I have the following line:
[Code]....
If I don't include the string identifying the Controller to use, I get an error stating that the PrimaryNavigation method couldn't be found in the Home Controller. Since the Site.Master View is in the Shared Views folder, I would have thought that the Shared Controller would have been used.
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Apr 13, 2010
I get an HttpException (details below) after installing Visual Studio 2010 Pro RTM in an application developed using Visual Studio 2010 RC. The platform used was ASP.NET MVC2 RTW (already under VS10 RC).
I first uninstalled all RC software and even ASP.NET MVC 2, and then did a "clean" install of VS10 RTM. The ASP.NET MVC 2 version now installed on my dev machine is 2.0.50217.0.
Exception Message: Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.
InnerException Message: <FilePath>ViewsLanguageRenderLanguageNavigation.ascx(6): error BC30451: 'Model' is not declared. It may be inaccessible due to its protection level.
The error occurs on this "Html.RenderAction":
[Code]....
The "LanguageController" just calls into another service function as below:
[Code]....
Does anybody have an idea what is causing the problem?
Edit:
By the way, I might also share the actual view (partial view) that would show the languages to select from:
[Code]....
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Jan 20, 2010
I was wondering if it's possible to render an Html Helper in a View inside a codeblock. So instead of:
[code]....
And have this render. Of course as it is, it wont render, so is there a way to programically decide if a textbox can be added without having to have a million delimiters in the page to accomplish this?
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Mar 15, 2010
I am trying to create 2 Html helpers but that use the String Type as in MVC 2.
1. Html.FileFor Would render something like: <input type="file"
2. Html.Buttom and Html.Submit that would render <input type="button" or <input type="submit" In this case I suppose it makes no sense to have the For.
I know how to do (2) unless there would be something more than rendering the help and defining the Html attributes. However (1) I don't know how to do it
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Jan 25, 2011
Is there a way to retrieve the client side ID for a model property similar to how the helpers like LabelFor etc generate the ID? For example, I have a model with a DateOfBirth property. I want to hook up that field to a jQuery DatePicker. Normally, I would hook up the date picker like this:
[Code]....
This works fine but hard codes the DateOfBirth property name. Ideally, I would like to use this:
[Code]....
Is this already available out of the box somewhere? I just created an extension method on the HtmlHelper class that does exactly this, but I wondered if there was already something built-in so I don't have to reinvent and test the wheel.
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Mar 30, 2011
i am using html.textboxfor to display the amount (int) from my model. currently once the form is shown, the default amount is = 0. i wish to have the default set as 1, is it possible to overwrite the default for html helper??
[Code]....
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Aug 4, 2010
I am using a view based of a formView.. say LogonViewForm (having userName and password) what i want to do is , suppose i enter my username and password and my account is not verified after logon. Its gives me a message as your account is not verified and redirects me to another view, what i want is it must be already having my username in its username textbox and must be disbaled. rite now i can pass the username value to verify view.. but can`t get how to disable the textbox.
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Mar 2, 2011
I was using the default MailMessage and SmtpClient classes for creating and sending HTML emails from a web forms website. The problem is I have a lot of hard coded HTML for formatting the email that gets sent. Is there a class that helps format emails for .NET?
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Oct 25, 2010
I think (I read it somewhere and can't find the source again) there is a new Google Analytics Html Helper on MVC 3 Beta.
Where can I find the source for this helper?
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