source: Dev/trunk/src/client/dojo/rpc/JsonpService.js

define([
        "../_base/array", "../_base/declare", "../_base/lang", "./RpcService", "../io/script"],
        function(array, declare, lang, RpcService, script){

// module:
//              dojo/rpc/JsonpService

return declare("dojo.rpc.JsonpService", RpcService, {
        // summary:
        //              Generic JSONP service.  Minimally extends RpcService to allow
        //              easy definition of nearly any JSONP style service. Example
        //              SMD files exist in dojox.data

        constructor: function(args, requiredArgs){
                if(this.required){
                        if(requiredArgs){
                                lang.mixin(this.required, requiredArgs);
                        }

                        array.forEach(this.required, function(req){
                                if(req=="" || req==undefined){
                                        throw new Error("Required Service Argument not found: "+req);
                                }
                        });
                }
        },

        strictArgChecks: false,

        bind: function(method, parameters, deferredRequestHandler, url){
                // summary:
                //              JSONP bind method. Takes remote method, parameters,
                //              deferred, and a url, calls createRequest to make a JSON-RPC
                //              envelope and passes that off with bind.
                // method: string
                //              The name of the method we are calling
                // parameters: array
                //              The parameters we are passing off to the method
                // deferredRequestHandler: deferred
                //              The Deferred object for this particular request

                var def = script.get({
                        url: url||this.serviceUrl,
                        callbackParamName: this.callbackParamName||"callback",
                        content: this.createRequest(parameters),
                        timeout: this.timeout,
                        handleAs: "json",
                        preventCache: true
                });
                def.addCallbacks(this.resultCallback(deferredRequestHandler), this.errorCallback(deferredRequestHandler));
        },

        createRequest: function(parameters){
                // summary:
                //              create a JSONP req
                // params: array
                //              The array of parameters for this request;

                var params = (lang.isArrayLike(parameters) && parameters.length==1) ?
                                parameters[0] : {};
                lang.mixin(params,this.required);
                return params;
        }
});

});