I'm converting an ASP.NET Forms app (that I didn't write) to an MVC 3 app. The ClientScriptManager is used in the old app. ClientScriptManager doesn't exist in MVC 3. What replaced ClientScriptManager? I've done enough reading to know that CSM has something to do with AJAX functionality in ASP.NET; it registers "sets" of js scripts and functions somewhat akin to how EditorTemplates work for sets of similar controls. I'm not necessarily looking to implement a CSM in MVC; I just want to know what practices Microsoft put in place that rendered CSM obsolete.
ASP.Net MVC was designed to give you complete control over the HTML and js, rather than having the framework render these for you, as with ASP.Net. So, nothing really "replaces" the ClientScriptManager. As a result, it is entirely up to you how you handle your js.
You can do something simple like include <script ...> tags to reference inline script or js files in your _Layout.cshtml file, or you could use some sort of JavaScript Loader like RequireJS or come up with your own scheme entirely using "Html Helpers" or something.
MVC 4 introduced the concept of bundling which lets you define collections of scripts as "bundles" and have MVC automatically minify and merge them together for you when you reference them in your Views like this :
#Scripts.Render("~/bundles/jquery")
Below is an example for rendering the JavaScript(Function) from Controller.
Controller
public ActionResult Index(int? id)
{
ViewBag.MyAlert = "<script type='text/javascript'>MyAlert();</script>";
}
View
<script src="Your Path" type="text/javascript"></script>
#Html.Raw(ViewBag.MyAlert)
JS
function MyAlert() {
alert('Hi');
}
Below is an example for rendering the JavaScript(File) from Controller.
protected override void OnActionExecuted(ActionExecutedContext filterContext)
{
StringBuilder sb = new StringBuilder();
sb.Append("<script src='Your Path' type='text/javascript'></script>");
filterContext.HttpContext.Response.Write(sb.ToString());
}
So using this approach you do not need to mentioned following code in View.
<script src="Your Path" type="text/javascript"></script>
Related
I know that this question may not be fit for stack overflow. I've been searching for an example on how to use the ajax helper but most toturials have only gone through the helper and they have not provided any practical example. I already know how to make use of ajax the javascript way but just want to know how I can use the ajax helper that microsoft has provided.
To describe how this GitHUb branch works:
First, let's define an action we're going to request. To keep things simple, let's just make a very basic POST action:
//
// POST: /Home/Ajax
[HttpPost]
public PartialViewResult Ajax()
{
// use partial view so we're not bringing the entire page's theme
// back in the response. We're simply returning the content within
// ~/Views/Home/Ajax.cshtml
return PartialView();
}
Next, setup a destination for your content and give it an id (here I've named it "update-me"):
<div class="well" id="update-me">
Click the button to see some AJAX content.
</div>
Moving on from there we setup the form. The below demonstrates the standard AJAX functionality, but you could bind your own functions to some of the events specified by AjaxOptions.
#using (Ajax.BeginForm("Ajax", new AjaxOptions {
HttpMethod = "POST", // HttpPost
InsertionMode = InsertionMode.Replace, // empty the target first
UpdateTargetId = "update-me" // place content within #update-me
}))
{
<button type="submit" class="btn btn-default">
<i class="glyphicon glyphicon-refresh"></i>
Click Me!
</button>
}
And finally, we need to specify our script libraries responsible for most of the ["automatic"] wiring up of the form functionality:
<script src="~/Scripts/jquery-2.1.1.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.min.js"></script>
That's it. As you begin playing with it you'll find it's pretty simple to extend it. For example, if you wanted to show a "working" icon you could specify custom functions in the OnBegin and OnComplete properties.
Ajax helper of ASP.NET MVC essentially provides Ajax functionality to your web applications. AJAX Helpers are used to create AJAX enabled elements like as Ajax enabled forms and links which performs request asynchronously. Using Ajax helper you can submit your HTML form using Ajax so that instead of refreshing the entire web page only a part of it can be refreshed. Additionally, you can also render action links that allow you to invoke action methods using Ajax. AJAX Helpers are extension methods of AJAXHelper class which exist in System.Web.Mvc.Ajax namespace.
AJAX-enabled link based on action/controller example:-
Following example shows how to use AJAX action link using action and controller in Asp.Net MVC.
#Ajax.ActionLink("Fatch Data", "GetData", new AjaxOptions {UpdateTargetId = "Data-container", HttpMethod = "GET" })
Here is the html output of above code block.
Output:
<a data-ajax="true" data-ajax-method="GET" data-ajax-mode="replace" data-ajax-update="#Data-container" href="/Home/GetData"> Fatch Data </a>
Do you know Unobtrusive AJAX in MVC?
The Unobtrusive Validation and AJAX support in ASP.NET MVC follow many best practices that enable Progressive Enhancement and are also super easy to use. The unobtrusive AJAX library (not the unobtrusive validation library) is admittedly a bit limited in functionality, but if it satisfies the requirements of the application you are writing, then by all means use it. And because the source code of it is in your app (it's JavaScript, after all), it's generally straightforward to make any updates or changes to it as you see fit.
I am writing some code where I would like render a MVC BeginForm but to also include additional HTML.
For eg.
#using (Html.BeginMyCustomForm()) {
}
And this spits out
<form action="" etc>
PLUS
<input type="hidden" name="my-additional-field-i-always-want">
#Html.ValidationMessageFor(m => m)
Is this possible?
I know I'll be looking at some kind of extension or something most likely.
Hope this makes sense and thanks in advance!
It's not a good idea to include such things in an extension to BeginForm. The reason is that good design dictates that objects should do one thing. This is called the Single Responsibility Principle.
You now want your form object to also create inputs and validation.
Instead, use the MVC templating system and create a default template to use for your needs. You should also use Html.HiddenFor rather than using an input tag, unless there is some specific reason not to.
Another option is to use MVC Scaffolding to generate what you want.
More about Editor Templates http://bradwilson.typepad.com/blog/2009/10/aspnet-mvc-2-templates-part-1-introduction.html
More about Scaffolding http://blog.stevensanderson.com/2011/01/13/scaffold-your-aspnet-mvc-3-project-with-the-mvcscaffolding-package/
Maybe you can use something like this?
public static class FormExtensions
{
public static MvcForm BeginMyCustomForm(this HtmlHelper htmlHelper)
{
var form = htmlHelper.BeginForm();
htmlHelper.ViewContext.Writer.write( .... )
return form;
}
}
Is the following markup incorrect, or is it a bug in the Razor engine in MVC4? Either way, what's the best workaround?
The entire content of View1.cshtml is shown. It compiles fine, but the Intellisense error highlighting is annoying. (Included as an image so you can see how the syntax is rejected by VS11.)
Hote that the #: syntax (instead of <text></text>) isn't accepted either.
It's a little tricky to mix JavaScript with Razor. Personally, I find it easier to always separate these two guys by using either Razor #function or Razor custom #helper.
Here's a simple example:
<script type="text/javascript">
function btn_clicked() {
#generateMyJavaScript()
}
</script>
<a href="javascript:void(0)" onclick='btn_clicked()'>Click on me</a>
#functions {
private MvcHtmlString generateMyJavaScript()
{
string jsBuilder = string.Empty;
if (true)
jsBuilder = "alert('Hey!');";
return MvcHtmlString.Create(jsBuilder);
}
}
I noticed strange behavior of the syntax highlighter too. This is not really an answer but:
I try staying away from mixing model data into javascript. Although powerfull it is a bit spaghetti-like.
Also I try to have as little as possible tags in the html. I use js includes and jQuery $(document).ready(function () ... functions inside those.
There you can extract the JSON data from the data attributes and base javascript decisions on those.
(Wanted to write this as a comment but didn't find the way to do that, sorry for the debump)
Anybody? There is another question regarding this but the only answers were to code up some javascript validation, which also refuses to work on my partial view ("$ is not defined").
Anyway, I don't want to use javascript I just want simple validation for required fields that cannot be left blank, number fields that require ints, etc.
Can anyone shed some light on validation and partial views?
I suspect that you are loading those partial views using AJAX. If this is the case you will need to manually invoke the $.validator.unobtrusive.parse method once you inject the new contents of the partial into the DOM as explained in this article.
Brad Wilson also discussed this in his blog post:
The unobtrusive client validation script automatically parses the
initial set of HTML for validation rules when the page has finished
loading. If your page dynamically adds new HTML content (perhaps
throught Ajax or through client-side application code), you may wish
to parse that new HTML for client validation on the new HTML elements.
To parse new HTML, you can call the
jQuery.validator.unobtrusive.parse() method, passing it a selector for
the HTML that you would like to be parsed. You can also call the
jQuery.validator.unobtrusive.parseElement() function to parse a single
HTML element.
As far as the $ is not defined error you should make sure that you have included the proper scripts:
<script src="#Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>
<script src="#Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="#Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
Also make sure you are not referencing any of the Microsoft*.js scripts. They are obsolete and should no longer be used in ASP.NET MVC 3.
Of course that's only a supposition, you haven't shown any code so we cannot know what you are doing.
I'm having the same problem and i found that it's not possible to call $.validator.unobtrusive.parse() on the same form twice.
When loading the form initially from the server the form is parsed automatically by the unobtrusive library. When you add an input element dynamically to the form and call $.validator.unobtrusive.parse() again, it won't work. The same goes for parseElement().
So before you call $.validator.unobtrusive.parse, remove the original validator and unobtrusive validation from the form like so:
success: function (html) {
$("#div-id").append(html);
var form = $("#div-id").closest("form");
form.removeData('validator');
form.removeData('unobtrusiveValidation');
$.validator.unobtrusive.parse($("#editorRows"));
}
I have an MVC3 site using Razor as its view engine. I want my site to be skinnable. Most of the possible skins are similar enough that they can derive from a shared master layout.
Therefore, I am considering this design:
However, I would like to be able to call RenderSection in the bottom layer, _Common.cshtml, and have it render a section that is defined in the top layer, Detail.cshtml. This doesn't work: RenderSection apparently only renders sections that are defined the next layer up.
Of course, I can define each section in each skin. For instance, if _Common needs to call RenderSection("hd") for a section defined in Detail, I just place this in each _Skin and it works:
#section hd {
#RenderSection("hd")
}
This results in some duplication of code (since each skin must now have this same section) and generally feels messy. I'm still new to Razor, and it seems like I might be missing something obvious.
When debugging, I can see the complete list of defined sections in WebViewPage.SectionWritersStack. If I could just tell RenderSection to look through the entire list before giving up, it would find the section I need. Alas, SectionWritersStack is non-public.
Alternatively, if I could access the hierarchy of layout pages and attempt execution of RenderSection in each different context, I could locate the section I need. I'm probably missing something, but I don't see any way to do this.
Is there some way to accomplish this goal, other than the method I've already outlined?
This is in fact not possible today using the public API (other than using the section redefinition approach). You might have some luck using private reflection but that of course is a fragile approach. We will look into making this scenario easier in the next version of Razor.
In the meantime, here's a couple of blog posts I've written on the subject:
http://blogs.msdn.com/b/marcinon/archive/2010/12/08/optional-razor-sections-with-default-content.aspx
http://blogs.msdn.com/b/marcinon/archive/2010/12/15/razor-nested-layouts-and-redefined-sections.aspx
#helper ForwardSection( string section )
{
if (IsSectionDefined(section))
{
DefineSection(section, () => Write(RenderSection(section)));
}
}
Would this do the job ?
I'm not sure if this is possible in MVC 3 but in MVC 5 I am able to successfully do this using the following trick:
In ~/Views/Shared/_Common.cshtml write your common HTML code like:
<!DOCTYPE html>
<html lang="fa">
<head>
<title>Skinnable - #ViewBag.Title</title>
</head>
<body>
#RenderBody()
</body>
</html>
In ~/Views/_ViewStart.cshtml:
#{
Layout = "~/Views/Shared/_Common.cshtml";
}
Now all you have to do is to use the _Common.cshtml as the Layout for all the skins. For instance, in ~/Views/Shared/Skin1.cshtml:
#{
Layout = "~/Views/Shared/_Common.cshtml";
}
<p>Something specific to Skin1</p>
#RenderBody()
Now you can set the skin as your layout in controller or view based on your criteria. For example:
public ActionResult Index()
{
//....
if (user.SelectedSkin == Skins.Skin1)
return View("ViewName", "Skin1", model);
}
If you run the code above you should get a HTML page with both the content of Skin1.cshtml and _Common.cshtml
In short, you'll set the layout for the (skin) layout page.
Not sure if this will help you, but I wrote some extension methods to help "bubble up" sections from within partials, which should work for nested layouts as well.
Injecting content into specific sections from a partial view ASP.NET MVC 3 with Razor View Engine
Declare in child layout/view/partial
#using (Html.Delayed()) {
<b>show me multiple times, #Model.Whatever</b>
}
Render in any parent
#Html.RenderDelayed();
See the answer link for more use-cases, like only rendering one delayed block even if declared in a repeating view, rendering specific delayed blocks, etc.