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JavascriptCallbackBehaviorAttribute Class

A contract behavior that allows you to set the URL query string parameter name to something other than the default “callback”.

System.Object
  System.Attribute
    System.ServiceModel.Web.JavascriptCallbackBehaviorAttribute

Namespace:  System.ServiceModel.Web
Assembly:  System.ServiceModel.Web (in System.ServiceModel.Web.dll)

[AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple = false)]
public sealed class JavascriptCallbackBehaviorAttribute : Attribute, 
	IContractBehavior

The JavascriptCallbackBehaviorAttribute type exposes the following members.

  NameDescription
Public methodJavascriptCallbackBehaviorAttributeInitializes a new instance of the JavascriptCallbackBehaviorAttribute class.
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  NameDescription
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public propertyUrlParameterNameGets or sets the URL query string parameter name to use for cross-domain script access.
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  NameDescription
Public methodAddBindingParametersAn implementation of the AddBindingParameters(ContractDescription, ServiceEndpoint, BindingParameterCollection) method.
Public methodApplyClientBehaviorAn implementation of the ApplyClientBehavior(ContractDescription, ServiceEndpoint, ClientRuntime) method.
Public methodApplyDispatchBehaviorAn implementation of the ApplyDispatchBehavior(ContractDescription, ServiceEndpoint, DispatchRuntime) method.
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodValidateAn implementation of the Validate(ContractDescription, ServiceEndpoint) method.
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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JSONP is a mechanism used to enable cross-site, scripting support in Web browsers. It involves sending a request with a callback function name provided as a URL query string parameter value. The service returns a response with the usual JSON payload wrapped in the call to the provided callback function as if it were a line of executable code.

The following is an example of a URL used to call a service: http://baseAddress/Service/RESTService?callback=functionName. When invoked, the service responds with the following JSON.

functionName({ “root”:”Something});

The JavascriptCallbackBehaviorAttribute allows developers to specify the name of the URL query string parameter to interpret as the callback parameter. The default value is “callback” (not case sensitive).

The following example shows how this attribute is applied to a service contract.

[ServiceContract]
[JavascriptCallbackBehavior]
public class Service1
{
    [OperationContract]
    [WebGet(ResponseFormat=WebMessageFormat.Json)]
    public string GetData()
    {            
         // ...
    }
}

This attribute only applies when it marks a service contract type that is used with the WebHttpBinding and the CrossDomainScriptAccessEnabled property of the binding is set to true.

.NET Framework

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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