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9 AJAX Capabilities
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Table 9-2 describes each of the public members of the class.
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TABLE 9-2
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Members of the AjaxHelper class
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Description
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The method formats the specified string as a JSON string. The method uses JavaScriptSerializer internally. The property gets and sets the path for localized scripts to be used by the extension methods of the class. The default path for localized scripts is ~/Scripts/Globalization. The property gets the collection of URL routes for the application. The property gets the context information about the view. The property gets the current view data dictionary. The property is implemented as a plain accessor for the ViewData property of the ViewDataContainer object. The property gets the view data container that is, a container class that currently includes only the ViewData dictionary.
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Member
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JavaScriptStringEncode GlobalizationScriptPath
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RouteCollection ViewContext ViewData
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ViewDataContainer
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The AjaxHelper class also has a generic version AjaxHelper<TModel> used for rendering HTML in AJAX scenarios within a strongly typed view. The generic version just implements the ViewData property differently to expose it as a ViewDataDictionary<TModel> object. More important than the source code of the AjaxHelper class itself is the list of the extension methods defined for it by the ASP.NET MVC framework.
Extension Methods for the AjaxHelper Class
There are not too many extension methods defined for the AjaxHelper class, even though the ones defined are important. The extension methods are outlined in Table 9-3.
TABLE 9-3
Extension Methods for the AjaxHelper class
Description
Emits an anchor tag pointing to the URL for the specified action. Emits a form tag using some ad hoc JavaScript code to submit any content. The URL of the action is expressed in the form of an action link. Emits a form tag using some ad hoc JavaScript code to submit any content. The URL of the action is expressed in the form of a route link. Emits an anchor tag pointing to the URL for the specified route.
Method
ActionLink BeginForm BeginRouteForm RouteLink
Each extension method comes with a long list of overloads to give developers a chance to specify an AJAX request with or without route parameters, HTML attributes, and so forth. As an example, here s the full list of overloads defined for the ActionLink method:
public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, AjaxOptions ajaxOptions);
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public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, object routeValues, AjaxOptions ajaxOptions); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, AjaxOptions ajaxOptions); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, RouteValueDictionary routeValues, AjaxOptions ajaxOptions); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, object routeValues, AjaxOptions ajaxOptions, object htmlAttributes); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, object routeValues, AjaxOptions ajaxOptions); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, RouteValueDictionary routeValues, AjaxOptions ajaxOptions); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, RouteValueDictionary routeValues, AjaxOptions ajaxOptions, IDictionary<string, object> htmlAttributes); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, object routeValues, AjaxOptions ajaxOptions, object htmlAttributes); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, RouteValueDictionary routeValues, AjaxOptions ajaxOptions, IDictionary<string, object> htmlAttributes);
9 AJAX Capabilities
public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, string protocol, string hostName, string fragment, object routeValues, AjaxOptions ajaxOptions, object htmlAttributes); public static MvcHtmlString ActionLink(this AjaxHelper ajaxHelper, string linkText, string actionName, string controllerName, string protocol, string hostName, string fragment, RouteValueDictionary routeValues, AjaxOptions ajaxOptions, IDictionary<string, object> htmlAttributes);
As you can see, all extension methods return a special flavor of a string type the MvcHtmlString type that you briefly met in 5, Inside Views. MvcHtmlString indicates that the string it represents has to be considered as a sanitized piece of HTML that should not be further encoded. You might want to be aware of some interesting aspects of MvcHtmlString that touch on the actual integration between ASP.NET MVC 2 and the underlying ASP.NET platform. Discussing such internal aspects of MvcHtmlString would probably be a digression from the current topic, so you can find out more in the sidebar Inside the MvcHtmlString Class. Getting back to the extension methods on the AjaxHelper class, the essential fact is that all extension methods in Table 9-3 emit a link that when clicked triggers an asynchronous request to the specified URL. Let s then delve deeper into action links.
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