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Portlets can use JavaScript in their content markup fragments, just like any other web page. One unique problem with content fragments in a portal page is that more than one instance of a portlet may be running. This means that any JavaScript variables or named HTML elements will appear more than once on the same page, which leads to unpredictable results. For instance, if you are using JavaScript mouse rollover code that sets the source URL for an HTML image, an image in another portlet might change instead. Two portlets developed independently may also inadvertently use the same names in their JavaScript code. To solve this problem, the designers of the portlet API added the concept of namespaces to the render response. The portal assigns each portlet on the portal page a unique name, even if it is the same Java class as another portlet on the page. The actual name used by the portal does not matter for the portlet developer, because the getNamespace() method on the RenderResponse interface returns the name. The JavaScript methods, JavaScript variables, and any HTML elements referenced in JavaScript should begin with this namespace where they appear in the page.

The event handler will contain the current XAML element in its sender argument, and an errorArgs object containing details of the error. The errorArgs argument contains three properties: errorType, errorMessage, and errorCode. For example, you could create an event handler for errors that provides details for runtime or XAML parsing errors like this:

The fact that XML is nothing but textual data ensures that it can be shared among heterogeneous systems. For example, how can a Visual Basic 6 (VB6) application running on a Windows machine talk with a Java application running on a Unix box XML is the answer.

public String getNamespace ()

function OnErrorEventHandler(sender, errorArgs) { var errorMsg = "Error: \n\n"; // Error errorMsg errorMsg errorMsg information common += "Error Type: += "Error Message: += "Error Code: to all errors. " + errorArgs.errorType + "\n"; " + errorArgs.errorMessage + "\n"; " + errorArgs.errorCode + "\n";

One problem with this approach is that when JavaScript code is included as an external source file, the portal does not process the code. If the JavaScript source file references any elements in the portlet, it will not work because it does not know the namespace. One solution would be to include the JavaScript methods in the portlet s content fragment, so everything can begin with the portlet s namespace. The other alternative is to write your JavaScript methods so that they take a reference to a JavaScript element as an argument. The JavaScript method will use the prefixed name.

As you already know, XML is an extensible standard. By using XML as a base, you can create your own vocabularies. Wireless Application Protocol (WAP), Wireless Markup Language (WML), and Simple Object Access Protocol (SOAP) are some examples of specialized XML vocabularies.

The ActionResponse interface extends the PortletResponse interface and has methods for sending redirects, setting render parameters, and setting the window state and the portlet mode. We discuss the window state and portlet mode functionality of the portlet later in this chapter. The functionality for both cuts across several classes in the portlet API. The methods on the ActionResponse interface for setting the window state and portlet mode are

switch(errorArgs.errorType) { case "RuntimeError": if (errorArgs.lineNumber != 0) { errorMsg += "Line: " + errorArgs.lineNumber + "\n"; errorMsg += "Position: " + errorArgs.charPosition + "\n"; } errorMsg += "MethodName: " + errorArgs.methodName + "\n"; break; case "ParserError": errorMsg += "Xaml File: " + errorArgs.xamlFile + "\n"; errorMsg += "Xml Element: " + errorArgs.xmlElement + "\n"; errorMsg += "Xml Attribute: " + errorArgs.xmlAttribute + "\n"; errorMsg += "Line: " + errorArgs.lineNumber + "\n"; errorMsg += "Position: break; default: break; } alert(errorMsg); } " + errorArgs.charPosition + "\n";