I badly need your help. I need to bind xml to grid in mvc4 using jquery mobile. i got xml through web service in controller but no idea how to make the xml content to grid and whether i need to pass the xml content to model ? I searched in net but didnt get clear example.
If this is a ajax called request, you can return back the xml as response of request and use an API to parse XML via Javascript. With that, you deserialize the xml just one time. If you parse to object and return model, you will deserialize two times.
Consider use: http://api.jquery.com/jquery.parsexml/
Related
I need to implement pagination. In controller, I ma just returning json data. View is purely client side development, MVC helpers are not implemented. View is done fully with jquery. Parameters are passed to controller through Ajax call and I am returning json data based on parameters by filtering data. How to implement pagination in this case?
Thanks
As example https://learn.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application
you have specific problems?
I am a newbie in Grails. On click of a button, I'm calling jQuery AJAX function. This function calls an action in a controller and renders the VO object as JSON. Now, this JSON is of a VO and I need to display this data in GSP which is opened as a model window. I am able to access the action output in jQuery. But how to use the same in GSP? (VO has Huge data). Can I keep data in session etc? Please advice
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.
I ve a question. I have a JSON string ready to send to an Struts2 action from a ajax javascript function. Action is called properly, but i dont know how to get the JSON parameter from its method.
Is any struts.xml action configuration that makes me able to put automatically the information in the object, just as ..attributeClass?
In a similar way that i send from the server to the jqGrid (a javascript object to make grids with data inside, just with struts configuration result type=json and the attributes of the object that i want to send as a JSON string to the client web)?
Or maybe the only way is forget the struts.xml configuration and "hard programming" HttpServletRequest parameter, that has JSON string?
Thank you!
Both the JSON plugin and REST plugin can do what you want. Which makes more sense to use depends on the application.
You could do the work manually, either by accessing the request directly (not recommended), or by manually parsing a string parameter.
I have an MVC project in which a controller action returns some JSON data (i.e. via /Home/GetData URL). This action also takes a custom object as a param.
This signature for the action is JsonResult GetData (MyCustomObject o)
I also have a client Silverlight project in which I'm constructing MyCustomObject and trying to call this URL (/Home/GetData/) via HttpWebRequest. However, I'm having trouble figuring out how to post in my object in this call. Do I need to serialize it to Json in order to pass it in?
Thanks so much!
MVC can accept and bind the submitted data to your MyCustomObject object, regardless of whether it is submitted as JSON, XML, a query string, a standard form POST, etc.
MVC does not require the object to be submitted in a particular fashion. That is up to you as the designer to determine what works best under the particular circumstances, given all of your requirements.
When submitted, MVC will use the ValueProvider suitable to the form of the data submitted, and the DefaultModelBinder will attempt to use the values in the ValueProvider to bind to your model.
Thanks for your help! Since the web app handles this with a getJSON call, I ended posting the object as a query string param i.e. I'm making a web request to http://../controller/action/view.aspx?custObject.property1=<value>&custObject.property2=<value> etc