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Using JSAPI with a JBoss SEAM Component

You can combine SEAM remoting with the JSAPI to do some interesting things

If you are using Actuate's JSAPI to run BIRT reports and you wish to pass parameters from a SEAM component this can be done very easily. In addition you can combine SEAM remoting with the JSAPI to do some interesting things. For example assume we create a SEAM component that retrieves report parameters that we want to use with the JSAPI. The component would look similar to this:

package com.actuate.seam.example;

import org.jboss.seam.annotations.*;
import org.jboss.seam.*;
import org.jboss.seam.annotations.remoting.WebRemote;

@Name("reportParameters")
@Scope(ScopeType.SESSION)
public class ReportParameters {
private String parmName = "";
private String parmValue = "";
public String getParmName() {
return parmName;
}
public void setParmName(String pn) {
this.parmName = pn;
}
public String getParmValue() {
return parmValue;
}
public void setParmValue(String pv) {
this.parmValue = pv;
}
@Create
public void initData() {
setParmName("customer");
setParmValue("CAF Imports");
}
@WebRemote
public String getAlternateReport() {
return "/Public/BIRT and BIRT Report Studio Examples/Top 5 Sales Performers.rptdesign";
}          
}

All we have in this class is a report parameter name and value. Obviously the values would not be hard coded but for simplicity they are in this example. We also have one web remote method to retrieve the path of a specific report. We will use this to change the report being rendered via SEAM remoting. The XHTML page would look like the following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:s="http://jboss.com/products/seam/taglib">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Seam Remoting - Actuate JSAPI Example</title>
</head>

<body>
<h1>Seam Remoting -Actuate JSAPI Example</h1>
<p></p>
<s:remote include="reportParameters" />

<button onclick="javascript:changeReport()">Change Report</button>
<div id="acviewer" />
<div id="jsapi_example_container">
<script type="text/javascript"
src="http://localhost:8080/ActuateJavaComponent/jsapi">
</script>

<script type="text/javascript">
actuate.load("viewer");
actuate.initialize("http://localhost:8080/ActuateJavaComponent/",
null,
null,
null,
initViewer);
var viewer;
function initViewer()
{
viewer = new actuate.Viewer("acviewer");
var viewerwidth = 800;
var viewerheight = 620;
viewer.setWidth(viewerwidth);
viewer.setHeight(viewerheight);
runInitial();
}
function runAlternate(newReport)
{
viewer.setReportName(newReport);
viewer.submit();
}
function runInitial()
{
viewer.setParameters({"#{reportParameters.parmName}":"#{reportParameters.parmValue}"});
viewer.setReportName("/Public/BIRT and BIRT Report Studio Examples/Customer Order History.rptdesign");
viewer.submit();
}
function changeReport() {
var callback = function(newReport) { runAlternate(newReport); };
Seam.Component.getInstance("reportParameters").getAlternateReport(callback);
}
</script>
</div>
</body>
</html>

We use the standard JSAPI viewer tag to run the report, with the EL-Bindings to retrieve the report parameter name and value when the page is loaded. The page also has a button to change the report. This button uses SEAM remoting to call the getAlternateReport method which returns the path to the new report. The callback function then calls the runAlternate JavaScript method which in turn calls the JSAPI to run the new report. When the page is first loaded the following is displayed.




Notice that the report is executed for CAF Imports, which is the parameter retrieved from the ReportParameters class. Clicking on the change report button will display the following.



This example is based on the SEAM remoting helloworld example. It was tested with JBoss AS 5.1.0 and SEAM 2.2.0. The source for it is available here. To run this example download and extract it to the jboss-seam-2.2.0.GA\examples\remoting directory. If you have already set the application server settings in the SEAM build.properties file, all you should have to do to build the example is type:
Ant explode in the example directory.

If you have downloaded Actuate’s Java Component technology and wish to deploy it to JBoss 5.1.0 GA, you will need to extract the war and remove xercesImpl.jar from the ActuateJavaComponent/WEB-INF/lib directory. Rebuild the WAR and deploy to your JBoss AS.

Read the original blog entry...

More Stories By Jason Weathersby

Jason Weathersby is a member of the extended BIRT development team at Actuate Corporation and has backgrounds in both computer science and technical writing. He has many years experience in technical consulting, training, writing, and publishing about reporting, business intelligence tools, and database technologies.

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