Looping in JSF

[Praveen Yendluri]

Hi

Is there any JSF tag equivalent to <logic:iterate> tag because I have an AyyayList<Student> having Student Objects.

Student Object has it properties like name, number, address .....

If I want to loop those properties how can I do it in JSF.

I can use DataTable, but I dont want to display in tabular form. Is this possible with <ui:repeat> tag? If so, please provide me a sample code?

Please let me know the solution for this?

Thanks,
Praveen

[Tuna Töre]

If you are using Facelet view Tech for the JSF development, try

 <ui:repeat value="#{company.departments}" var="deparment">
    <b>#{deparment.name}</b>
	    <ui:repeat value="#{deparment.employees}" var="employee">
		<b>#{employee.lastName}, #{employee.firstName}</b>
		</ui:repeat>
    </ui:repeat>

look at these web sites for further reference
http://www.jsftoolbox.com/documentation/facelets/10-TagReference/facelets-ui-repeat.html
http://facelets.java.net/nonav/docs/dev/docbook.html#template-repeat

Tuna TÖRE

[Praveen Yendluri]

Hi Tuna,

I have tried as per your suggestion, but it is throwing below error. Do I need to configure this managed bean in faces-config.xml? I have used annotations here.

Error Parsing /index.xhtml: Error Traced[line: 30] The value of attribute "value" associated with an element type "null" must not contain the '<' character.

javax.faces.view.facelets.FaceletException: Error Parsing /index.xhtml: Error Traced[line: 30] The value of attribute "value" associated with an element type "null" must not contain the '<' character.
at com.sun.faces.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:387)
at com.sun.faces.facelets.compiler.SAXCompiler.doMetadataCompile(SAXCompiler.java:370)
at com.sun.faces.facelets.compiler.Compiler.metadataCompile(Compiler.java:123)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.createMetadataFacelet(DefaultFaceletFactory.java:353)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:231)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:164)
at com.sun.faces.application.view.ViewMetadataImpl.createMetadataView(ViewMetadataImpl.java:102)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:239)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
at java.lang.Thread.run(Thread.java:619)



My Managed Bean:

@ManagedBean
public class DynamicDataLoadGraph {

private DynamicDataLoadGraphObject ddlobj= null;
public DynamicDataLoadGraph(){
}
public ArrayList getReleasedData(){
ArrayList dataList = new ArrayList();

for(int i=0;i<10;i++){
ddlobj = new DynamicDataLoadGraphObject();
ddlobj.setGood(i+10);
ddlobj.setLate(i+30);
ddlobj.setWarned(i+25);
dataList.add(ddlobj);

}

return dataList;

}

My Value Object:

public class DynamicDataLoadGraphObject {

private int late = 0;
private int warned = 0;
private int good = 0;

public int getGood() {
return good;
}

public void setGood(int good) {
this.good = good;
}

public int getLate() {
return late;
}

public void setLate(int late) {
this.late = late;
}

public int getWarned() {
return warned;
}

public void setWarned(int warned) {
this.warned = warned;
}

}


Below is my sample code in Xhtml.

<ui:repeat value="#{dynamicDataLoadGraph.getReleasedData}" var="released">
<ui:repeat value="#{released.DynamicDataLoadGraphObject}" var="part">
setData (0,0,part.good);
setData (0,0,part.warned);
setData (0,0,part.late);
</ui:repeat>
</ui:repeat>

Please help me regarding this.

Thank you,
Praveen

[Tuna Töre]

Try the code below, it will work as you expected
May be you can modify it, but first you should understand that two repeat tags are only required if you want to iterate like in two for statement

for (i = 0; i < ...; i++) {
            for (j = 0; j < ....; j++) {
                if (......) {
                    .....;
                    break ...;
                }
            }
        }

otherwise only one repeat tag is enough.

DynamicDataLoadGraph class

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.managedbeanandobject;

import java.util.ArrayList;
import javax.faces.bean.ManagedBean;

/**
 *
 * @author Tuna TORE */

@ManagedBean
public class DynamicDataLoadGraph {

    private DynamicDataLoadGraphObject ddlobj = null;
    private ArrayList releaseData = null; /*changed */

    public DynamicDataLoadGraph() {
    }

    /**
     * @return the releaseData
     */
    public ArrayList getReleaseData() { /*******************changed ***********************/

        releaseData = new ArrayList(); /*changed */

        for (int i = 0; i < 10; i++) {
            ddlobj = new DynamicDataLoadGraphObject();
            ddlobj.setGood(i + 10);
            ddlobj.setLate(i + 30);
            ddlobj.setWarned(i + 25);
            releaseData.add(ddlobj);

        }

        return releaseData;

    }
}

DynamicDataLoadGraphObject class

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.managedbeanandobject;

/**
 *
 * @author Tuna TORE */
public class DynamicDataLoadGraphObject {

    private int late = 0;
    private int warned = 0;
    private int good = 0;

    public int getGood() {
        return good;
    }

    public void setGood(int good) {
        this.good = good;
    }

    public int getLate() {
        return late;
    }

    public void setLate(int late) {
        this.late = late;
    }

    public int getWarned() {
        return warned;
    }

    public void setWarned(int warned) {
        this.warned = warned;
    }
}

index.html class

<?xml version='1.0' encoding='UTF-8' ?>
<!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:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
     <br/>

        <ui:repeat value="#{dynamicDataLoadGraph.releaseData}" var="released">
            <b>#{released.warned}, #{released.good}, #{released.late}</b> <br/>
        </ui:repeat>

    </h:body>
</html>

Tuna TÖRE

[Tim Holloway]

I don't know why you don't want any tables. That output's going to wrap round and round the webpage in one big long paragraph. I would have at least made the deparment start a new line.

However, I can't spot anything wrong in your example. Which one of those xthml lines is "line 30"? That message usually comes from having a misplaced quote in the View source text.

[Praveen Yendluri]

Hi Tuna,

Application is throwing error saying property "getReleasedData" not fund. My managed bean name is DynamicDataLoadGraph. I had called in XHTML as value="#{dynamicDataLoadGraph.releasedData}". Is this wrong?

javax.el.PropertyNotFoundException: /index.xhtml @18,80 value="#{dynamicDataLoadGraph.releasedData}": Property 'getReleasedData' not found on type com.samples.examples.DynamicDataLoadGraph


Thank you,
Praveen

[Tuna Töre]

First change your classes by the above classes (because I have changed classes a little) then try again calling from xhtml page.
It will work as you expect, there are some typos inside your code...

Tuna TÖRE