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The server no longer supports a command.
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The server supports a new command.
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Now that we can reference commands by these symbols, let s look at a generic mechanism for issuing the commands to the portal management server. We need a helper method that generically sends Ajax-based portal commands to the server. Consider this usage contract:
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myPortal.issuePortalCommand( Portal.SAVE_SETTINGS_ACTION, "setting1=" + setting1Value, "setting2=" + setting2Value, ... );
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In this scenario, we re contemplating a method named issuePortalCommand() that takes the name of a command as its first argument (for example, one of our
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The enhanced Ajax web portal
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constants) and a variable number of arguments corresponding to the parameters the command expects/requires. The parameters are, quite intentionally, of the exact form as that required by the net.ContentLoader s sendRequest() method. The issuePortalCommand() method we ve defined could be implemented as follows:
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issuePortalCommand: function( commandName ) { var actionParam = this.options['actionParam']; var urlSuffix = this.options['urlSuffix'];
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Get action parameter
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if (!urlSuffix) urlSuffix=""; var url = this.baseUrl; var callParms = []; if (actionParam){ callParms.push( actionParam + "=" + commandName Apply action parameter ); }else{ url += "/" + commandName Apply URL suffix + urlSuffix; } for ( var i = 1 ; i < arguments.length ; i++ ) callParms.push( arguments[i] ); var ajaxHelper = new net.ContentLoader( this, url, "POST", [] ); Create ContentLoader ajaxHelper.sendRequest .apply( ajaxHelper, callParms ); Send request },
This method builds a URL based on the configuration options that we discussed in section 11.6.1. If we have supplied a value for actionParam b, then it will be added to the parameters that are POSTed to the server d. If not, we will append the command to the URL path e, adding the URL suffix if we have supplied one in our options c. The first function argument is the command name. All remaining arguments are treated as request parameters. The URL that we have constructed is then passed to the ContentLoader f, and the request is sent with the request parameters in tow g, as illustrated in the example usage shown previously. With this method in place, each of our portal command APIs will have a nicely minimal implementation. Another for free feature of having a generic method like this is that we can support new commands that become available on the server without having to change any client code. For now, let s look at the commands we do know about.
Refactoring
Login Recall that our login button s onclick handler initiates a call to the login() method of our page, which in turn calls this method. The login command, at least from the perspective of the server, is a command that the server must handle by checking the credentials and then (if they are valid) responding with the same response that our load-page command would perform. With that in mind, let s look at the implementation shown in listing 11.15.
Listing 11.15 The portal login method
login: function(userName, password) { this.userName = userName; this.password = password; if ( this.options.messageSpanId ) document.getElementById( this.options.messageSpanId).innerHTML = "Verifying Credentials"; this.issuePortalCommand( Portal.LOGIN_ACTION, "user=" + this.userName, "pass=" + this.password ); },
The method puts a Verifying Credentials message into the span designated by our configurable option this.options.messageSpanId. It then issues a login command to the portal back end, passing the credentials that were passed into the method as request parameters. The issuePortalCommand() method we ve just put in place does all the hard work. Load settings Recall that the createPortal() function of our page calls this method to load the initial configuration of our portal windows. The method to load the settings for the page is even simpler than the login method just discussed. It s just a thin wrapper around our issuePortalCommand(). It passes the user as the lone parameter that the server uses to load the relevant window settings, since the settings are on a per-user basis:
loadPage: function(action) { this.issuePortalCommand( Portal.LOAD_SETTINGS_ACTION, "user=" + this.userName, "pass=" + this.password ); },
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