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The urlKey parameter is sometimes called a slug. As an alternative to the slug, we might also choose to add additional information to the route, such as the primary key. If we employed this technique, our URL would look like /speakers/13/ben-scheirman. The 13 would be a unique identifier, and the remaining segment of the URL would exist simply for the benefit of readability. Refer to chapter 16 for more information on creating custom routes like this.
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In our Ajax case, we don t want an entire view to be returned from the action. This would result in a large HTML document being returned in an Ajax call. For an Ajax call, we want to return the JSON data directly. We ll use the same technique we did in listing 12.5 and notify the action about the type of request. We can also use this opportunity to allow for multiple formats to be rendered. The modified controller action shown in listing 12.9 accepts an optional format as an argument. Valid values would be html (the default), partial (for HTML fragments), xml, and json. Our view can choose to respond to any one or all of those formats.
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Ajax in ASP.NET MVC Listing 12.9 A modified controller action that accepts an optional format
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public ActionResult Details(string urlKey, string format) { var speaker = _repository.FindSpeakerByUrlKey(urlKey); if (format == "json") return Json(speaker, JsonRequestBehavior.AllowGet); return View(speaker); }
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Serialize speaker to JSON
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The Json() method B returns a JsonResult from the action and contains the object formatted as JSON. JsonRequestBehavior.AllowGet causes a GET request to work. By default, this would only work with POST requests.
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Sending any data via JSON
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You can send anonymous objects to the Json() method and have your object serialized to JSON format correctly. This is useful when you want to return JSON data that doesn t directly map to a class in your project. For example, this is valid:
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return Json( new { Name="Joe", Occupation="Plumber" } );
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By using the Json() method in your controller action, you re instructing the ASP.NET MVC Framework to transform the object into JSON data, set the proper HTTP response headers, and send a valid JSON response back to the browser.
You can supply this new format parameter by appending it as a normal query string variable, like this:
format=json
A better way would be to add a custom route and treat it like an extension. Open the Global.asax file and add the following route rule just above the default route:
routes.MapRoute("FriendlySpeakersUrl", "speakers/{urlKey}.{format}", new {controller = "Speakers", action = "details", format = "html"} );
You ll learn more details of routing in chapter 16, but this route is in addition to the default routes in the Application_Start method. Instead of applying the format parameter as a value after the question mark, it will instead look like an extension. To test our different rendering formats, we ll open up the same speaker detail page from before, but this time we ll add .json to the end of the URL, as shown in figure 12.7. We could easily add more formats, such as XML. In the event that format is omitted (as in our original URL) this action parameter will be null. Because we added the .json extension on the URL, the website returns the response data in JSON format. When opened up in Notepad, we can easily examine the contents of the JSON response.
Ajax in ASP.NET MVC
Figure 12.7 Our JSON result from the browser opened up in Notepad. The .json extension causes the response to be JSON instead of HTML.
Now that we have our JSON-enabled Ajax action ready for use, let s see how we can modify the speaker listing page to consume this.
12.3.5 Consuming a JSON action from the view
The first task is to hook into the click event of each link. When the user clicks a list item, as coded in listing 12.10, an Ajax call will be made to get the speaker details (as JSON) and construct a small detail box alongside the link.
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