lets say I want to a partial view like the following sample
#Html.RenderAction("ListDocuments", "MultiFileAttachments", new { id = jsparameter });
in the jsparameter I want to pass as a parameter that is the result of a javascript function. Maybe this is not logical because javascript runs on the client, but how can I achieve a similar functionality ? thank you in advance
If you need to call a part of a page based on some actions or values determined by actions on the client side, then you should think to use JavaScript (preferably jQuery) and Ajax.
Through jQuery-Ajax, you could easily call a Partial view through the Contoler and since it's a regular HTTP request, you would be able to pass all the parameters you need.
Using code as :
#Html.RenderAction("ListDocuments", "MultiFileAttachments", new { id = jsparameter });
is not possible since it is rendered by the server before it's sent to the client browser.
Related
I am using ASP NET MVC4, I want to use partial view to update my main view. On the server I get certain events from another server, and when that happens I want to update the partial view and post it to the client. How can I do that? In other words, I want a way to force rendering partial view on the server side without a postback request coming from the client. Is that possible, or the client must be informed first and then does its own postback action to trigger the partial view rendering?
Call The follwing Ajax call on every other server event or call it periodically
$.get('#Url.Action("ActionName", "ControllerName")', function (data) {
$('#Id of div where Partial View is renderred').html(data);
});
In the action called.
public ActionResult ActionName()
{
//load your model with changes
return PartialView("Name of your partial view", model);
}
This is a better job for SignalR for large scale Real-time work reference:
[http://www.asp.net/signalr/overview/signalr-20/hubs-api/hubs-api-guide-server][1]
Or if you just need to stay on single medium, you can look into node.js, which is Server side javascript and allows for binding of js function to server driven events (i.e. Client independent)
One last thought would be to use events and kick out Web Api Responses, but that would be getting a lot of weight on JSON without page requests.
I have the requirement to use Html.RenderAction like you would in ASP.NET MVC.
For instance I have a Home Page with News and Products on.
I would like to do for instance
#Html.RenderAction("/api/products/featured")
Which would start a new service call and output the template to the html stream.
Is this possible using ServiceStack Razor and if so how do I accomplish it?
The PartialExamples.cshtml test page shows different examples of rendering a razor view inside a page, e.g:
Using the new RenderToAction() method which lets you execute a Service and it's rendered partial view with a route and QueryString, e.g:
#Html.RenderAction("/products/1")
This also takes an optional view name if you want a different view than the default:
#Html.RenderAction("/products/1", "CustomProductView")
There's also the normal Html.Partial() to specify which view and model you want to render in the page, e.g:
#Html.Partial("GetProduct",
base.ExecuteService<ProductService>(s => s.Any(new GetProduct { Id = 1 })))
ExecuteService is simply a wrapper around the equivalent ResolveService in a using statement, i.e:
#{
Response response = null;
using (var service = base.ResolveService<ProductService>())
{
response = service.Any(new GetProduct { Id = 1 });
}
}
#Html.Partial("GetProduct", response)
The new RenderToAction() method in Razor Views was added in v4.0.34+ which is now available on MyGet.
*I may be duplicating my answer or I lost it somehow
Looking at the ServiceStack.Razor.ViewPage class there is an Html property of type ServiceStack.Html.HtmlHelper. I don't see 'RenderAction' as a method (or extension method) on this class so it doesn't appear to be available. There is a 'Partial' method that takes the ViewName and an overload that takes a ViewName and an object. Based on your above comment this doesn't appear to be a useful solution.
If I'm correct about the above, I think you'd need your 'Featured View Template' to pull in the data. Could add soemthing like
{ FeaturedResponse products = new JsonServiceClient("http://localhost").Get<FeaturedResponse>("/api/products/featured"); }
to your template. This would allow you to use the products variable like a Model.
Or, use JavaScript to pull the data into the template. You would have have to use JavaScript to get your data into the HTML elements, though.
You could then render the template using #Html.Partial('Featured')
Hope this helps.
I am new to MVC and I am continuing to learn more each day. I am converting and webform application to MVC for practice and wanted to know is there a way to call GET on a action and return json, array or whatever I want on document.ready function? I can do this using webapi, but I would rather do it using an action in the controller. I like the helpers that they Microsoft provides but they are for forms and action links, etc. Thanks for any help.
$(document).ready(function(){
$.ajax(Somehow call controller action here with data), success(function that returns json data)
});
I think this article has a great explanation with examples
http://www.codeproject.com/Articles/41828/JQuery-AJAX-with-ASP-NET-MVC
I am starting a new project, and keen to make use of the KnockoutJS + Web Api which are new to me, I have a good understanding of the Web Api, but Knockout is tough to get my head around at the moment.
This is my initial thoughts of how I want my app to work:
I have a standard MVC controller such as LeadsController
LeadsController has an Action called ListLeads, this doesn't actually return any data though, but just returns a view with a template to display data from Knockout.
The ListLeads view calls my api controller LeadsApiController via ajax to get a list of leads to display
The leads data is then mapped to a KnockoutJs ViewModel (I don't want to replicate my view models from server side into JavaScript view models)
I want to use external JavaScript files as much as possible rather than bloating my HTML page full of JavaScript.
I have seen lots of examples but most of them return some initial data on the first page load, rather than via an ajax call.
So my question is, how would create my JavaScript viewModel for Knockout when retrieved from ajax, where the ajax url is created using Url.Content().
Also, what if I need additional computed values on this ViewModel, how would I extend the mapped view model from server side.
If I haven't explained myself well, please let me know what your not sure of and I'll try and update my question to be more explicit.
I think your design is a good idea. In fact, I am developing an application using exactly this design right now!
You don't have to embed the initial data in your page. Instead, when your page loads, create an empty view model, call ko.applyBindings, then start an AJAX call which will populate the view model when it completes:
$(function () {
var viewModel = {
leads: ko.observableArray([]) // empty array for now
};
ko.applyBindings(viewModel);
$.getJSON("/api/Leads", function (data) {
var newLeads = ko.mapping.fromJS(data)(); // convert to view model objects
viewModel.leads(newLeads); // replace the empty array with a populated one
});
});
You'll want to put a "Loading" message somewhere on your page until the AJAX call completes.
To generate the "/api/Leads" URL, use Url.RouteUrl:
<script>
var apiUrl = '#Url.RouteUrl("DefaultApi", new { httproute = "", controller = "Leads" })';
</script>
(That's assuming your API route configured in Global.asax or App_Start\RouteConfig.cs is named "DefaultApi".)
The knockout mapping plugin is used above to convert the AJAX JSON result into a knockout view model. By default, the generated view model will have one observable property for each property in the JSON. To customise this, such as to add additional computed properties, use the knockout mapping plugin's "create" callback.
After getting this far in my application, I found I wanted more meta-data from the server-side view models available to the client-side code, such as which properties are required, and what validations are on each property. In the knockout mapping "create" callbacks, I wanted this information in order to automatically generate additional properties and computed observables in the view models. So, on the server side, I used some MVC framework classes and reflection to inspect the view models and generate some meta-data as JavaScript which gets embeded into the relevant views. On the client side, I have external JavaScript files which hook up the knockout mapping callbacks and generate view models according the meta-data provided in the page. My advice is to start out by writing the knockout view model customisations and other JavaScript by hand in each view, then as you refactor, move generic JavaScript functions out into external files. Each view should end up with only the minimal JavaScript that is specific to that view, at which point you can consider writing some C# to generate that JavaScript from your server-side view model annotations.
For the url issue add this in your _Layout.cshtml in a place where it is before the files that will use it:
<script>
window._appRootUrl = '#Url.Content("~/")';
</script>
Then you can use the window._appRootUrl to compose urls with string concatenation or with the help of a javascript library like URI.js.
As for the additional computed values, you may want to use a knockout computed observable. If that is not possible or you prefer to do it in .Net you should be able to create a property with a getter only, but this won't update when you update other properties on the client if it depends on them.
In ASP.NET MVC, there is a useful method Request.IsAjaxRequest that I can use to determine whether the request is made via AJAX. However, RenderAction method seems to be calling the controller/action via AJAX as well.
I would like the calls via RenderAction to return a View, whereas calls via AJAX to return a Json object. Is there any way I can distinguish calls from those two sources?
EDIT:
Re. jim: I simply call a RenderAction within a View:
In SomeView.ascx:
Html.RenderAction("Action", "AnotherController", new { id = "some ID" });
I believe you could use ControllerContext.IsChildAction to determine if a method was called by RenderAction().