IBM R1 - page 34

Including JavaScript source code

The next piece of code includes the JavaScript code from the ds>js>delivery.js file in the page so

that the functions in the code can be called from the current page.

Populating a frameset in a JSP

The next chunk of code uses the doReloadFrame, frame, and action tags from the delivery-js.tld

file to create a JavaScript function that correctly reloads the specified frame when an action

occurs in another frame.

<js:doReloadFrame>

<js:frame

name="system"><delivery:action>system</delivery:action></js:frame>

<js:frame

name="courseTree"><delivery:action>courseTree</delivery:action></js:fra

me>

<js:frame

name="courseTools"><delivery:action>courseTools</delivery:action></js:f

rame>

<js:frame

name="activity"><delivery:action>activity</delivery:action></js:frame>

</js:doReloadFrame>

Displaying errors to the user

The next chunk of code uses the define tag of the Struts-bean tag library to retrieve the context

parameter of the delivery_context JavaBean. The code inside the script opening and closing tags

is JavaScript code that defines the load function which reports any errors generated by the

context parameter. If errors are encountered, the code displays the errors in an alert box on the

page.

<bean:define id="context" name="delivery_context" scope="request"

type="com.lotus.elearn.delivery.DeliveryContext"/>

var mainDeliveryServerFrame = true;

var contentWindow = null;

var API = null;

function load()

{

<% if (context.getErrorMessageKey() != null) { %>

alert("<delivery:errorMessage

key="<%=context.getErrorMessageKey()%>" filter="false"/>");

<% } %>

API = window.frames['system'].document.applets['api-adapter'];

}

</script>

</head>

Chapter 5: Customizing JavaServer Pages 29